impact crushers with high reduction ratio

nordberg np1415 impact crusher - metso outotec

nordberg np1415 impact crusher - metso outotec

Nordberg NP1415 HSI crusher consists of heavy rotor, wear resistant materials, and an optimal crusher chamber design. This combination has proven revolutionary in improving capacity and product quality, as well as in reducing operating and wear costs.

Nordberg NP1415 HSI crusher has a unique blow bar attachment system. With an optimal blow bar alignment on the crossbeam contact faces, the attachment system reduces risks of breakage and enables pushing the use of cast iron in blow bars beyond conventional limits.

The crusher configuration can be adjusted for your requirements. Options like full hydraulic breaker plate adjustment setting, third breaker plate, or different grades of steel and cast iron for the blow bars with the possibility for ceramic inserts, enable customizing Nordberg NP1415 HSI crusher exactly for your needs.

Furthermore, Metso IC crusher automation can control the crusher operation and give a complete overview of the crushing performance. It also allows adjusting Nordberg NP1415 HSI crusher from a distance.

Self-Rotor Rotation system (SRR) is available for Nordberg NP1415 HSI crusher. It allows positioning the rotor during the maintenance period when changing the blow bars or adjusting the breaker plates without human intervention inside the crusher.

nordberg np1620 impact crusher - metso outotec

nordberg np1620 impact crusher - metso outotec

Nordberg NP1620 HSI crusher consists of heavy rotor, wear resistant materials, and an optimal crusher chamber design. This combination has proven revolutionary in improving capacity and product quality, as well as in reducing operating and wear costs.

Nordberg NP1620 HSI crusher has a unique blow bar attachment system. With an optimal blow bar alignment on the crossbeam contact faces, the attachment system reduces risks of breakage and enables pushing the use of cast iron in blow bars beyond conventional limits.

The crusher configuration can be adjusted for your requirements. Options like full hydraulic breaker plate adjustment setting, third breaker plate, or different grades of steel and cast iron for the blow bars with the possibility for ceramic inserts, enable customizing Nordberg NP1620 HSI crusher exactly for your needs.

Furthermore, Metso IC crusher automation can control the crusher operation and give a complete overview of the crushing performance. It also allows adjusting Nordberg NP1620 HSI crusher from a distance.

Self-Rotor Rotation system (SRR) is available for Nordberg NP1620 HSI crusher. It allows positioning the rotor during the maintenance period when changing the blow bars or adjusting the breaker plates without human intervention inside the crusher.

crusher reduction ratio

crusher reduction ratio

Ihave mentioned the fact that, as the %of voids in the crushing chamber decreases, the production of fines by attrition increases. This is likesaying that, as the Crusher Reduction Ratio in any given crusher is increased, the %of fines in the product will increase, even though the discharge setting remains unchanged. Both of these statements are true, but the degree to which the product is affected depends to a much greater extent upon the ratio-of-volume-reduction in the crusher chamber than it does upon the actual degree of reduction performed on the material. For a given ratio-of-reduction, the type of crusher with a flared crushing chamber will usually deliver a cleaner product than any of the older types; conversely, more reduction can be performed in the machine without creating excessive fines.

The facts outlined in the foregoing paragraph have an important bearing on crushing plant design. Commercial crushing plant operators are usually desirous of making as few fines as possible, and this is becoming increasingly important as the demand for small grades of screened material increases. To hold down the amount of dust on screenings in the combined plant product, it is essential that the amount of reduction per crushing stage be held within conservative limits; moreover, it is important that the work in each stage be apportioned with due regard to the characteristics of the crushers comprising these stages.

As an example, suppose that it is required to make a reduction of 7:1 in two stages of crushers, one a standard gyratory and the other a fine-reduction crusher. We know from our examination of the crushing characteristics of these types that, for equal reduction ratios, the volume-reduction-ratio in the standard gyratory is considerably higher than it is in the fine reduction crusher. Therefore, if minimum production of fines is desirable, it is logical that the heavy end of the 7:1 reduction should be handled in the latter machine. Generally, for such a case, the split would be about 3:1 to the standard machine, and 4:1 to the fine reduction crusher.

reduction ratio for crushers

reduction ratio for crushers

Our corporation is a manufacturer and exporter of your crushers, serving the crushing aggregate market for 20 years. Stone Crushers is definitely an perfect device for major and secondary crushing are extensively applied in hydroelectricity, highway, mining, transportation, energy, metallurgical, construction, road creating, chemical and phosphatic industry.

Jaw crushers are operated to produce a size reduction ratio between 4:1 and 9:1 Gyratory crushers can produce size reduction ratios over a somewhat larger range of 3:1 to 10:1 The primary operating variable available on a crusher is the set and on jaw and gyratory the open- side set (OSS) is specified

Crusher types and the crusher dimensions to be used in the experiment . Reduction Ratio (Theoretical) = Reduction Ratio (Calculated) = Reduction Get Price; Crusher Reduction Ratio - 911 Metallurgist. Mar 19, 2017 What is the impact of the Crusher Reduction Ratio on crusher upon the ratio-of- volume-reduction in the crusher chamber than it does upon

Sep 19, 2012 Jaw crushers offer reduction ratios of up to about 6:1, while cone crushers can reduce material size up to a maximum of 8:1 ratio The finer the crushing, the smaller the reduction ratio As a basic rule, jaw crushers are the primary crusher taking the mined aggregate and reducing it to a size that a cone crusher can accept

The primary contributor to poor crusher performance is crushing chamber selection. If the fit between the mantle and concave in combination with the eccentric throw setting is incorrect, then the optimal reduction ratio cannot be achieved.

Reduction ratios will vary with each application within each family of Hammermills and by the amount of applied energy. HammerMaster Crushers are limited by horsepower and feed size, so depending on the grate selection and desired product size in closed circuit, reduction ratios will range between 6:1 to as much as 20:1.

Friction reduction ratio is the function of the average velocity of fracturing fluid, the gelled agent concentration, and the proppant concentration. Based on the linear regression of 1049 experimental and field data, Lord et al. put forward the following empirical formula to calculate the friction reduction ratio of HPG fracturing fluid (Lord, 1987):

Crusher Reduction Ratio I have mentioned the fact that, as the % of voids in the crushing chamber decreases, the production of fines by attrition increases. This is like saying that, as the Crusher Reduction Ratio in any given crusher is increased, the % of fines in the product will increase, even though the discharge setting remains unchanged.

The quality of the final product depends decisively on the integration of the cone crusher in the complete processing method. If the permissible marginal conditions, such as feed size, feed grain composition and reduction ratio are observed, a cone crusher produces grain sizes that meet the standards provided that the stone properties permit this.

Reduction Ratio (Theoretical) = Reduction Ratio (Calculated) = Reduction ratio generally varies between 3 to 6 or 7. Theoretical Capacity of Jaw Crusher = (0.6 Get Price; jaw crushers roll crushers size reduction equipment - Sturtevant, Inc. Sturtevant Jaw Crushers are unsurpassed in coarse and ratio.

Sep 19, 2012 Jaw crushers offer reduction ratios of up to about 6:1, while cone crushers can reduce material size up to a maximum of 8:1 ratio. The finer the crushing, the smaller the reduction ratio. As a basic rule, jaw crushers are the primary crusher taking the mined aggregate and reducing it to a size that a cone crusher can accept.

Reduction Ratio (Theoretical) = Reduction Ratio (Calculated) = Reduction ratio generally varies between 3 to 6 or 7. Theoretical Capacity of Jaw Crusher = (0.6 Get Price; jaw crushers roll crushers size reduction equipment - Sturtevant, Inc. Sturtevant Jaw Crushers are unsurpassed in coarse and ratio.

Hp Series Cone Crushers Wear Parts. Reduction ratio the reduction ratio is the ratio between the size of feed and the size of the outgoing product it is normally measured at the 80 passing point a typical reduction ratio in the hp standard cavity is 35 and in the hp short head cavity it is 24 wear parts application guide hp series cone crusher hp cone crusher and

Crusher size reduction ratio is the ratio of raw material particle size and particle size of crushing.Calculated method are the following: 1. with the maximum size and the broken material after the product before the maximum particle size ratio calculation, Britain and the United States in the 80% materials through sieve aperture width is the ...

Reduction Ratio Of Limestone Crusher. 2 Crusher Reduction Ratio. Crusher Reduction RatioCrusher Reduction Ratio Therefore if minimum production of fines is desirable it is logical that the heavy end of the 71 reduction should be handled in the latter machine Generally for such a case the split would be about 31 to the standard machine and 41 to the fine reduction crusher.

Crusher types and the crusher dimensions to be used in the experiment . Reduction Ratio (Theoretical) = Reduction Ratio (Calculated) = Reduction Get Price; Crusher Reduction Ratio - 911 Metallurgist. Mar 19, 2017 What is the impact of the Crusher Reduction Ratio on crusher upon the ratio-of- volume-reduction in the crusher chamber than it does upon

Reduction Ratio For Cone Crusher. Jaw crushers offer reduction ratios of up to about 61 while cone crushers can reduce material size up to a maximum of 81 ratio the finer the crushing the smaller the reduction ratio as a basic rule jaw crushers are the primary crusher taking the mined aggregate and reducing it to a size that a cone crusher can ...

A general rule of thumb for applying Cone Crushers is the reduction ratio A crusher with coarse style liners would typically have a 6 1 reduction ratio Thus with a 34 closed side setting the maximum feed would be 6 x 34 or 4 5 inches Reduction ratios of 8 1 may .

Horizontal shaft impact (HSI) crushers are known for high reduction ratios, especially when processing soft and medium-hard materials. 's family of HSI crushers is called NP Series HSI crushers. They deliver unbeatable performance in primary, secondary and tertiary crushing in aggregates production, mining operations, as ...

reduction ratio of crushers wiersmaenzoonnl. reduction ratio jaw crusher pdf adicelsalvadororg Tracked Jaw Crusher GUILT Features & Benefits Up to 300+ tonnes per hour production rate Mobile Jaw Crushers 10570 The 'Tesab 10570 Tracked jaw crusher is,More Info; reduction ratio of a crushers drsmachcorg. 24/7 Online

Crusher size reduction ratio is the ratio of raw material particle size and particle size of crushing.Calculated method are the following: 1. with the maximum size and the broken material after the product before the maximum particle size ratio calculation, Britain and the United States in the 80% materials through sieve aperture width is the ...

Reduction Ratio For Cone Crusher. Jaw crushers offer reduction ratios of up to about 61 while cone crushers can reduce material size up to a maximum of 81 ratio the finer the crushing the smaller the reduction ratio as a basic rule jaw crushers are the primary crusher taking the mined aggregate and reducing it to a size that a cone crusher can ...

The reduction ratio for a jaw crusher is typically 6-to-1, although it can ..... crusher gap setting with automatic zero-point calculation can speed... Read More. Crusher . A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. ... An early politically connected and wealthy Robber Baron figure Sir Robert ...

Reduction Ratio For Cone Crusher. Jaw crushers offer reduction ratios of up to about 61 while cone crushers can reduce material size up to a maximum of 81 ratio the finer the crushing the smaller the reduction ratio as a basic rule jaw crushers are the primary crusher taking the mined aggregate and reducing it to a size that a cone crusher can ...

Friction reduction ratio is the function of the average velocity of fracturing fluid, the gelled agent concentration, and the proppant concentration. Based on the linear regression of 1049 experimental and field data, Lord et al. put forward the following empirical formula to calculate the friction reduction ratio of HPG fracturing fluid (Lord, 1987):

The operation is similar to the standard cone crushers, except that the size reduction is caused more by attrition than by impact [5]. The reduction ratio is around 8:1 and as the product size is relatively small the feed size is limited to less than 50 mm with a nip angle between 25 and 30. The Gyradisc crushers have head diameters from ...

Reduction Ratio (Theoretical) = Reduction Ratio (Calculated) = Reduction ratio generally varies between 3 to 6 or 7. Theoretical Capacity of Jaw Crusher = (0.6 Get Price; jaw crushers roll crushers size reduction equipment - Sturtevant, Inc. Sturtevant Jaw Crushers are unsurpassed in coarse and ratio.

Reduction Ratio an overview ScienceDirect Topics. In any crushing operation the raw material flow rate and the reduction ratio ratio of feed size to product size have obvious influences on the wear of crushing equipment However the hardness and fracture toughness of the rocks being crushed are unavoidable parameters in allowing for the wear of crushing

A crusher with coarse style liners would typically have a 6:1 reduction ratio. Thus, with a 34" closed side setting, the maximum feed would be 6 x 34 or 4.5 inches. Reduction ratios of 8:1 may be possible in certain coarse crushing applications. Fine liner configurations typically have reduction ratios of .

secondary impact crushers - meka crushing & screening plants

secondary impact crushers - meka crushing & screening plants

MSI and MSIH Series crushers are very versatile for the production of fine materials with a precise cubical shape. The robust design boosts productivity and ensures that our customers can successfully carry out difficult tasks. A high reduction ratio provides less recirculation in the crushing plant, thus decreasing the workload of the vibrating screens, conveyors and other crushers. As a result, overall maintenance and spare parts requirements for MEKAs crushing and screening plants are minimal compared to competitors plants.

MEKAs series of crushers have been designed to gain the trust and confidence of our customers. Our precisely machined welded construction rotors have proven construction, ensuring long-term use. In addition, all components are of premium quality in order to give our customers a trouble-free operation experience.

Our MSIH Series grinding impact crushers have a very competitive design for the asphalt recycling process. Our experienced engineering team has optimised the structure of the distributor plates to be less sensitive to sticky materials, separating these materials better, which is particularly important in the asphalt recycling processes. The MSIH Series design, with two independent breaker plates, is also optimized to provide better performance in concrete recycling processes.

MEKA secondary impact crushers are manufactured using two different designs in order to respond to our customers different needs. One of these designs is the MSI series secondary impact Crusher with two independent breaking plates, which may be adjusted by hydraulic setting rods. Their large feed opening is a key advantage for most applications requiring the feeding of materials up to 350 mm.

Alternatively, the grinding type of MSIH series secondary impact crusher provides a very high reduction ratio for crushing medium abrasive materials such as river gravel and basalt. Grinding types of crushers have distributor plates that are useful for separating sticky materials. Under the distributor plate, there are grinding plates that contribute to the production of fine cubical materials.

impact crusher - an overview | sciencedirect topics

impact crusher - an overview | sciencedirect topics

The impact crusher (typically PE series) is widely used and of high production efficiency and good safety performance. The finished product is of cube shape and the tension force and crack is avoided. Compared with hammer crusher, the impact crusher is able to fully utilize the high-speed impact energy of entire rotor. However, due to the crushing board that is easy to wear, it is also limited in the hard material crushing. The impact crusher is commonly used for the crushing of limestone, coal, calcium carbide, quartz, dolomite, iron pyrites, gypsum, and chemical raw materials of medium hardness. Effect of process conditions on the production capacity of crushed materials is listed in Table8.10.

Depending on the size of the debris, it may either be ready to enter the recycling process or need to be broken down to obtain a product with workable particle sizes, in which case hydraulic breakers mounted on tracked or wheeled excavators are used. In either case, manual sorting of large pieces of steel, wood, plastics and paper may be required, to minimise the degree of contamination of the final product.

The three types of crushers most commonly used for crushing CDW materials are the jaw crusher, the impact crusher and the gyratory crusher (Figure 4.4). A jaw crusher consists of two plates, with one oscillating back and forth against the other at a fixed angle (Figure 4.4(a)) and it is the most widely used in primary crushing stages (Behera etal., 2014). The jaw crusher can withstand large and hard-to-break pieces of reinforced concrete, which would probably cause the other crushing machines to break down. Therefore, the material is initially reduced in jaw crushers before going through any other crushing operation. The particle size reduction depends on the maximum and minimum size of the gap at the plates (Hansen, 2004).

An impact crusher breaks the CDW materials by striking them with a high-speed rotating impact, which imparts a shearing force on the debris (Figure 4.4(b)). Upon reaching the rotor, the debris is caught by steel teeth or hard blades attached to the rotor. These hurl the materials against the breaker plate, smashing them into smaller particle sizes. Impact crushers provide better grain-size distribution of RA for road construction purposes, and they are less sensitive to material that cannot be crushed, such as steel reinforcement.

Generally, jaw and impact crushers exhibit a large reduction factor, defined as the ratio of the particle size of the input to that of the output material. A jaw crusher crushes only a small proportion of the original aggregate particles but an impact crusher crushes mortar and aggregate particles alike and thus generates a higher amount of fine material (OMahony, 1990).

Gyratory crushers work on the same principle as cone crushers (Figure 4.4(c)). These have a gyratory motion driven by an eccentric wheel. These machines will not accept materials with a large particle size and therefore only jaw or impact crushers should be considered as primary crushers. Gyratory and cone crushers are likely to become jammed by fragments that are too large or too heavy. It is recommended that wood and steel be removed as much as possible before dumping CDW into these crushers. Gyratory and cone crushers have advantages such as relatively low energy consumption, a reasonable amount of control over the particle size of the material and production of low amounts of fine particles (Hansen, 2004).

For better control of the aggregate particle size distribution, it is recommended that the CDW should be processed in at least two crushing stages. First, the demolition methodologies used on-site should be able to reduce individual pieces of debris to a size that the primary crusher in the recycling plant can take. This size depends on the opening feed of the primary crusher, which is normally bigger for large stationary plants than for mobile plants. Therefore, the recycling of CDW materials requires careful planning and communication between all parties involved.

A large proportion of the product from the primary crusher can result in small granules with a particle size distribution that may not satisfy the requirements laid down by the customer after having gone through the other crushing stages. Therefore, it should be possible to adjust the opening feed size of the primary crusher, implying that the secondary crusher should have a relatively large capacity. This will allow maximisation of coarse RA production (e.g., the feed size of the primary crusher should be set to reduce material to the largest size that will fit the secondary crusher).

The choice of using multiple crushing stages mainly depends on the desired quality of the final product and the ratio of the amounts of coarse and fine fractions (Yanagi etal., 1998; Nagataki and Iida, 2001; Nagataki etal., 2004; Dosho etal., 1998; Gokce etal., 2011). When recycling concrete, a greater number of crushing processes produces a more spherical material with lower adhered mortar content (Pedro etal., 2015), thus providing a superior quality of material to work with (Lotfi etal., 2017). However, the use of several crushing stages has some negative consequences as well; in addition to costing more, the final product may contain a greater proportion of finer fractions, which may not always be a suitable material.

Reduction of the broken rock material, or oversized gravel material, to an aggregate-sized product is achieved by various types of mechanical crusher. These operations may involve primary, secondary and even sometimes tertiary phases of crushing. There are many different types of crusher, such as jaw, gyratory, cone (or disc) and impact crushers (Fig. 15.9), each of which has various advantages and disadvantages according to the properties of the material being crushed and the required shape of the aggregate particles produced.

Fig. 15.9. Diagrams to illustrate the basic actions of some types of crusher: solid shading highlights the hardened wear-resistant elements. (A) Single-toggle jaw crusher, (B) disc or gyrosphere crusher, (C) gyratory crusher and (D) impact crusher.

It is common, but not invariable, for jaw or gyratory crushers to be utilised for primary crushing of large raw feed, and for cone crushers or impact breakers to be used for secondary reduction to the final aggregate sizes. The impact crushing machines can be particularly useful for producing acceptable particle shapes (Section 15.5.3) from difficult materials, which might otherwise produce unduly flaky or elongated particles, but they may be vulnerable to abrasive wear and have traditionally been used mostly for crushing limestone.

Reduction of the broken rock material, or oversized gravel material, to an aggregate-sized product is achieved by various types of mechanical crusher. These operations may involve primary, secondary and even sometimes tertiary phases of crushing. There are many different types of crusher, such as jaw, gyratory, cone (or disc) and impact crushers (Figure 16.8), each of which has various advantages and disadvantages according to the properties of the material being crushed and the required shape of the aggregate particles produced.

Fig. 16.8. Diagrams to illustrate the basic actions of some types of crusher: solid shading highlights the hardened wear-resistant elements (redrawn, adapted and modified from Ref. 39). (a) Single-toggle jaw crusher, (b) disc or gyrosphere crusher, (c) gyratory crusher, and (d) impact crusher.

It is common, but not invariable, for jaw or gyratory crushers to be utilised for primary crushing of large raw feed, and for cone crushers or impact breakers to be used for secondary reduction to the final aggregate sizes. The impact crushing machines can be particularly useful for producing acceptable particle shapes (section 16.5.3) from difficult materials, which might otherwise produce unduly flaky or elongated particles, but they may be vulnerable to abrasive wear and have traditionally been used mostly for crushing limestone.

The main sources of RA are either from construction and ready mixed concrete sites, demolition sites or from roads. The demolition sites produce a heterogeneous material, whereas ready mixed concrete or prefabricated concrete plants produce a more homogeneous material. RAs are mainly produced in fixed crushing plant around big cities where CDWs are available. However, for roads and to reduce transportation cost, mobile crushing installations are used.

The materiel for RA manufacturing does not differ from that of producing NA in quarries. However, it should be more robust to resist wear, and it handles large blocks of up to 1m. The main difference is that RAs need the elimination of contaminants such as wood, joint sealants, plastics, and steel which should be removed with blast of air for light materials and electro-magnets for steel. The materials are first separated from other undesired materials then treated by washing and air to take out contamination. The quality and grading of aggregates depend on the choice of the crusher type.

Jaw crusher: The material is crushed between a fixed jaw and a mobile jaw. The feed is subjected to repeated pressure as it passes downwards and is progressively reduced in size until it is small enough to pass out of the crushing chamber. This crusher produces less fines but the aggregates have a more elongated form.

Hammer (impact) crusher: The feed is fragmented by kinetic energy introduced by a rotating mass (the rotor) which projects the material against a fixed surface causing it to shatter causing further particle size reduction. This crusher produces more rounded shape.

The type of crusher and number of processing stages have considerable influence on the shape and size of RA. In general, for the same size, RAs tend to be coarser, more porous and rougher than NAs, due to the adhered mortar content (Dhir etal., 1999). After the primary crushing, which is normally performed using jaw crushers (Fong etal., 2004), it is preferable to adopt a secondary crushing stage (with cone crushers or impact crushers) (CCANZ, 2011) to further reduce the size of the CDW, producing more regularly shaped particles (Barbudo etal., 2012; Ferreira etal., 2011; Fonseca etal., 2011; Pedro etal., 2014, 2015; Gonzlez-Fonteboa and Martnez-Abella, 2008; Maultzsch and Mellmann, 1998; Dhir and Paine, 2007; Chidiroglou etal., 2008).

CDW that is subjected to a jaw crushing stage tends to result only in flatter RA (Ferreira etal., 2011; Fonseca etal., 2011; Hendriks, 1998; Tsoumani etal., 2015). It is possible to produce good-quality coarse RA within the specified size range by adjusting the crusher aperture (Hansen, 1992). In addition, the number of processing stages needs to be well thought out to ensure that the yield of coarse RA is not affected and that the quantity of fine RA is kept to the minimum (Angulo etal., 2004). This is because the finer fraction typically exhibits lower quality, as it accumulates a higher amount of pulverised old mortar (Etxeberria etal., 2007b; Meller and Winkler, 1998). Fine RA resulting from impact crushers tends to exhibit greater angularity and higher fineness modulus compared with standard natural sands (Lamond etal., 2002; Hansen, 1992; Buyle-Bodin and Hadjieva-Zaharieva, 2002).

One of the commonly known issues related to the use of RCA is its ability to generate a considerable amount of fines when the material is used (Thomas etal., 2016). As the RCA particles are moved around, they impact against one another, leading to the breakage of the friable adhered mortar, which may give rise to some technical problems such as an increase in the water demand of concrete mixes when used as an NA replacement (Thomas etal., 2013a,b; Poon etal., 2007).

The coarse fraction of RMA tends to show a higher shape index owing to the shape of the original construction material (e.g., perforated ceramic bricks) (De Brito etal., 2005). This can pose a problem in future applications as RMA may not compact as efficiently as RCA or NA (Khalaf and DeVenny, 2005). Its shape index may be reduced if the material is successively broken down to a lower particle size (De Brito etal., 2005).

Impact crushers (e.g., hammer mills and impact mills) employ sharp blows applied at high speed to free-falling rocks where comminution is by impact rather than compression. The moving parts are beaters, which transfer some of their kinetic energy to the ore particles upon contact. Internal stresses created in the particles are often large enough to cause them to shatter. These forces are increased by causing the particles to impact upon an anvil or breaker plate.

There is an important difference between the states of materials crushed by pressure and by impact. There are internal stresses in material broken by pressure that can later cause cracking. Impact causes immediate fracture with no residual stresses. This stress-free condition is particularly valuable in stone used for brick-making, building, and roadmaking, in which binding agents (e.g., tar) are subsequently added. Impact crushers, therefore, have a wider use in the quarrying industry than in the metal-mining industry. They may give trouble-free crushing on ores that tend to be plastic and pack when the crushing forces are applied slowly, as is the case in jaw and gyratory crushers. These types of ore tend to be brittle when the crushing force is applied instantaneously by impact crushers (Lewis et al., 1976).

Impact crushers are also favored in the quarry industry because of the improved product shape. Cone crushers tend to produce more elongated particles because of their ability to pass through the chamber unbroken. In an impact crusher, all particles are subjected to impact and the elongated particles, having a lower strength due to their thinner cross section, would be broken (Ramos et al., 1994; Kojovic and Bearman, 1997).

Figure 6.23(a) shows the cross section of a typical hammer mill. The hammers (Figure 6.23(b)) are made from manganese steel or nodular cast iron containing chromium carbide, which is extremely abrasion resistant. The breaker plates are made of the same material.

The hammers are pivoted so as to move out of the path of oversize material (or tramp metal) entering the crushing chamber. Pivoted (swing) hammers exert less force than they would if rigidly attached, so they tend to be used on smaller impact crushers or for crushing soft material. The exit from the mill is perforated, so that material that is not broken to the required size is retained and swept up again by the rotor for further impacting. There may also be an exit chute for oversize material which is swept past the screen bars. Certain design configurations include a central discharge chute (an opening in the screen) and others exclude the screen, depending on the application.

The hammer mill is designed to give the particles velocities of the order of that of the hammers. Fracture is either due to impact with the hammers or to the subsequent impact with the casing or grid. Since the particles are given high velocities, much of the size reduction is by attrition (i.e., particle on particle breakage), and this leads to little control on product size and a much higher proportion of fines than with compressive crushers.

The hammers can weigh over 100kg and can work on feed up to 20cm. The speed of the rotor varies between 500 and 3,000rpm. Due to the high rate of wear on these machines (wear can be taken up by moving the hammers on the pins) they are limited in use to relatively non-abrasive materials. They have extensive use in limestone quarrying and in the crushing of coal. A great advantage in quarrying is the fact that they produce a relatively cubic product.

A model of the swing hammer mill has been developed for coal applications (Shi et al., 2003). The model is able to predict the product size distribution and power draw for given hammer mill configurations (breaker gap, under-screen orientation, screen aperture) and operating conditions (feed rate, feed size distribution, and breakage characteristics).

For coarser crushing, the fixed hammer impact mill is often used (Figure 6.24). In these machines the material falls tangentially onto a rotor, running at 250500rpm, receiving a glancing impulse, which sends it spinning toward the impact plates. The velocity imparted is deliberately restricted to a fraction of the velocity of the rotor to avoid high stress and probable failure of the rotor bearings.

The fractured pieces that can pass between the clearances of the rotor and breaker plate enter a second chamber created by another breaker plate, where the clearance is smaller, and then into a third smaller chamber. The grinding path is designed to reduce flakiness and to produce cubic particles. The impact plates are reversible to even out wear, and can easily be removed and replaced.

The impact mill gives better control of product size than does the hammer mill, since there is less attrition. The product shape is more easily controlled and energy is saved by the removal of particles once they have reached the size required.

Large impact crushers will reduce 1.5m top size ROM ore to 20cm, at capacities of around 1500th1, although units with capacities of 3000th1 have been manufactured. Since they depend on high velocities for crushing, wear is greater than for jaw or gyratory crushers. Hence impact crushers are not recommended for use on ores containing over 15% silica (Lewis et al., 1976). However, they are a good choice for primary crushing when high reduction ratios are required (the ratio can be as high as 40:1) and the ore is relatively non-abrasive.

Developed in New Zealand in the late 1960s, over the years it has been marketed by several companies (Tidco, Svedala, Allis Engineering, and now Metso) under various names (e.g., duopactor). The crusher is finding application in the concrete industry (Rodriguez, 1990). The mill combines impact crushing, high-intensity grinding, and multi-particle pulverizing, and as such, is best suited in the tertiary crushing or primary grinding stage, producing products in the 0.0612mm size range. It can handle feeds of up to 650th1 at a top size of over 50mm. Figure 6.22 shows a Barmac in a circuit; Figure 6.25 is a cross-section and illustration of the crushing action.

The basic comminution principle employed involves acceleration of particles within a special ore-lined rotor revolving at high speed. A portion of the feed enters the rotor, while the remainder cascades to the crushing chamber. Breakage commences when rock enters the rotor, and is thrown centrifugally, achieving exit velocities up to 90ms1. The rotor continuously discharges into a highly turbulent particle cloud contained within the crushing chamber, where reduction occurs primarily by rock-on-rock impact, attrition, and abrasion.

This crusher developed by Jaques (now Terex Mineral Processing Solutions) has several internal chamber configurations available depending on the abrasiveness of the ore. Examples include the Rock on Rock, Rock on Anvil and Shoe and Anvil configurations (Figure 6.26). These units typically operate with 5 to 6 steel impellers or hammers, with a ring of thin anvils. Rock is hit or accelerated to impact on the anvils, after which the broken fragments freefall into the discharge chute and onto a product conveyor belt. This impact size reduction process was modeled by Kojovic (1996) and Djordjevic et al. (2003) using rotor dimensions and speed, and rock breakage characteristics measured in the laboratory. The model was also extended to the Barmac crushers (Napier-Munn et al., 1996).

Figure 9.1 shows common aluminum oxide-based grains. Also called corundum, alumina ore was mined as early as 2000 BC in the Greek island of Naxos. Its structure is based on -Al2O3 and various admixtures. Traces of chromium give alumina a red hue, iron makes it black, and titanium makes it blue. Its triagonal system reduces susceptibility to cleavage. Precious grades of Al2O3 are used as gemstones, and include sapphire, ruby, topaz, amethyst, and emerald.

Charles Jacobs (1900), a principal developer, fused bauxite at 2200C (4000F) before the turn of the 20th century. The resulting dense mass was crushed into abrasive particles. Presently, alumina is obtained by smelting aluminum alloys containing Al2O3 in electric furnaces at around 1260C (2300F), a temperature at which impurities separate from the solution and aluminum oxide crystallizes out. Depending upon the particular process and chemical composition there are a variety of forms of aluminum oxide. The poor thermal conductivity of alumina (33.5W/mK) is a significant factor that affects grinding performance. Alumina is available in a large range of grades because it allows substitution of other oxides in solid solution, and defect content can be readily controlled.

For grinding, lapping, and polishing bearing balls, roller races, and optical glasses, the main abrasive employed is alumina. Its abrasive characteristics are established during the furnacing and crushing operations, so very little of what is accomplished later significantly affects the features of the grains.

Aluminum oxide is tougher than SiC. There are four types of gradations for toughness. The toughest grain is not always the longest wearing. A grain that is simply too tough for an application will become dull and will rub the workpiece, increasing the friction, creating heat and vibrations. On the other hand, a grain that is too friable will wear away rapidly, shortening the life of the abrasive tool. Friability is a term used to describe the tendency for grain fractures to occur under load. There is a range of grain toughness suitable for each application. The white friable aluminum oxide is almost always bonded by vitrification. It is the main abrasive used in tool rooms because of its versatility for a wide range of materials. In general, the larger the crystals, the more friable the grain. The slower the cooling process, the larger are the crystals. To obtain very fine crystals, the charge is cooled as quickly as possible, and the abrasive grain is fused in small pigs of up to 2ton. Coarse crystalline abrasive grains are obtained from 5 to 6ton pigs allowed to cool in the furnace shell.

The raw material, bauxite, containing 8590% alumina, 25% TiO2, up to 10% iron oxide (Fe2O3), silica, and basic oxides, is fused in an electric-arc furnace at 2600C (4700F). The bed of crushed and calcined bauxite, mixed with coke and iron to remove impurities, is poured into the bottom of the furnace where a carbon starter rod is laid down. A couple of large vertical carbon rods are then brought down to touch and a heavy current applied. The starter rod is rapidly consumed, by which time the heat melts the bauxite, which then becomes an electrolyte. Bauxite is added over several hours to build up the volume of melt. Current is controlled by adjusting the height of the electrodes, which are eventually consumed in the process.

After cooling, the alumina is broken up and passed through a series of hammer, beater, crush, roller, and/or ball mills to reduce it to the required grain size and shape, producing either blocky or thin splintered grains. After milling, the product is sieved to the appropriate sizes down to about 40 m (#400). The result is brown alumina containing typically 3% TiO2. Increased TiO2 content increases toughness while reducing hardness. Brown alumina has a Knoop hardness of 2090 and a medium friability.

Electrofused alumina is also made using low-soda Bayer process alumina that is more than 99% pure. The resulting alumina grain is one of the hardest, but also the most friable, of the alumina family providing a cool cutting action. This abrasive in a vitrified bond is, therefore, suitable for precision grinding.

White aluminum oxide is one of the most popular grades for micron-size abrasive. To produce micron sizes, alumina is ball-milled or vibro-milled after crushing and then traditionally separated into different sizes using an elutriation process. This consists of passing abrasive slurry and water through a series of vertical columns. The width of the columns is adjusted to produce a progressively slower vertical flow velocity from column to column. Heavier abrasive settles out in the faster flowing columns while lighter particles are carried over to the next. The process is effective down to about 5 m and is also used for micron sizing of SiC. Air classification has also been employed.

White 99% pure aluminum oxide, called mono-corundum, is obtained by sulfidation of bauxite, which outputs different sizes of isometric corundum grains without the need for crushing. The crystals are hard, sharp, and have better cleavage than other forms of aluminum oxides, which qualifies it for grinding hardened steels and other tough and ductile materials. Fine-grained aluminum oxide with a good self-sharpening effect is used for finishing hardened and high-speed steels, and for internal grinding.

Not surprisingly, since electrofusion technology has been available for the last one hundred years, many variations in the process exist both in terms of starting compositions and processing routes. For example:

Red-brown or gray regular alumina. Contains 9193% Al2O3 and has poor cleavage. This abrasive is used in resinoid and vitrified bonds and coated abrasives for rough grinding when the risk of rapid wheel wear is low.

Chrome addition. Semi-fine aloxite, pink with 0.5% chromium oxide (Cr2O3), and red with 15% Cr2O3, lies between common aloxite, having less than 95% Al2O3 and more than 2% TiO2, and fine aloxite, which has more than 95% Al2O3 and less than 2% TiO2. The pink grain is slightly harder than white alumina, while the addition of a small amount of TiO2 increases its toughness. The resultant product is a medium-sized grain available in elongated, or blocky but sharp, shapes. Ruby alumina has a higher chrome oxide content of 3% and is more friable than pink alumina. The grains are blocky, sharp edged, and cool cutting, making them popular for tool room and dry grinding of steels, e.g., ice skate sharpening. Vanadium oxide has also been used as an additive giving a distinctive green hue.

Zirconia addition. Aluminazirconia is obtained during the production process by adding 1040% ZrO2 to the alumina. There are at least three different aluminazirconia compositions used in grinding wheels: 75% Al2O3 and 25% ZrO2, 60% Al2O3 and 40% ZrO2, and finally, 65% Al2O3, 30% ZrO2, and 5% TiO2. The manufacture usually includes rapid solidification to produce a fine grain and tough structure. The resulting abrasives are fine grain, tough, highly ductile, and give excellent life in medium to heavy stock removal applications and grinding with high pressures, such as billet grinding in foundries.

Titania addition. Titaniaaloxite, containing 95% Al2O3 and approximately 3% Ti2O3, has better cutting ability and improved ductility than high-grade bauxite common alumina. It is recommended when large and variable mechanical loads are involved.

Single crystal white alumina. The grain growth is carefully controlled in a sulfide matrix and is separated by acid leaching without crushing. The grain shape is nodular which aids bond retention, avoiding the need for crushing and reducing mechanical defects from processing.

Post-fusion processing methods. This type of particle reduction method can greatly affect grain shape. Impact crushers such as hammer mills create a blocky shape while roll crushers cause splintering. It is possible, using electrostatic forces to separate sharp shapes from blocky grains, to provide grades of the same composition but with very different cutting actions.

The performance of the abrasive can also be altered by heat treatment, particularly for brown alumina. The grit is heated to 11001300 C (20152375 F), depending on the grit size, in order to anneal cracks and flaws created by the crushing process. This can enhance toughness by 2540%.

Finally, several coating processes exist to improve bonding of the grains in the grinding wheel. Red Fe2O3 is applied at high temperatures to increase the surface area for better bonding in resin cut-off wheels. Silane is applied for some resin bond wheel applications to repel coolant infiltration between the bond and abrasive grit, and thus protect the resin bond.

A limitation of electrofusion is that the resulting abrasive crystal structure is very large; an abrasive grain may consist of only one to three crystals. Consequently, when grain fracture occurs, the resulting particle loss may be a large proportion of the whole grain. This results in inefficient grit use. One way to avoid this is to dramatically reduce the crystal size.

The earliest grades of microcrystalline grits were produced as early as 1963 (Ueltz, 1963) by compacting a fine-grain bauxite slurry, granulating to the desired grit size, and sintering at 1500C (2735F). The grain shape and aspect ratio could be controlled by extruding the slurry.

One of the most significant developments since the invention of the Higgins furnace was the release in 1986, by the Norton Company, of seeded gel (SG) abrasive (Leitheiser and Sowman, 1982; Cottringer et al., 1986). This abrasive was a natural outcome of the wave of technology sweeping the ceramics industry at that time to develop high strength engineering ceramics using chemical precipitation methods. This class of abrasives is often termed ceramic. SG is produced by a chemical process. In a precursor of boehmite, MgO is first precipitated to create 50-m-sized aluminamagnesia spinel seed crystals. The resulting gel is dried, granulated to size, and sintered at 1200C (2200F). The resulting grains are composed of a single-phase -alumina structure with a crystalline size of about 0.2m. Defects from crushing are avoided; the resulting abrasive is unusually tough but self-sharpening because fracture now occurs at the micron level.

With all the latest technologies, it took significant time and application knowledge to understand how to apply SG. The abrasive was so tough that it had to be blended with regular fused abrasives at levels as low as 5% to avoid excessive grinding forces. Typical blends are now five SGs (50%), three SGs (30%), and one SG (10%). These blended abrasive grades can increase wheel life by up to a factor of 10 over regular fused abrasives, although manufacturing costs are higher.

In 1981, prior to the introduction of SG, the 3M Co. introduced a solgel abrasive material called Cubitron for use in coated abrasive fiber discs (Bange and Orf, 1998). This was a submicron chemically precipitated and sintered material but, unlike SG, had a multiphase composite structure that did not use seed grains to control crystalline size. The value of the material for grinding wheel applications was not recognized until after the introduction of SG. In the manufacture of Cubitron, alumina is co-precipitated with various modifiers such as magnesia, yttria, lanthana, and neodymia to control microstructural strength and surface morphology upon subsequent sintering. For example, one of the most popular materials, Cubitron 321, has a microstructure containing submicron platelet inclusions which act as reinforcements somewhat similar to a whisker-reinforced ceramic (Bange and Orf, 1998).

Direct comparison of the performance of SG and Cubitron is difficult because the grain is merely one component of the grinding wheel. SG is harder (21GPa) than Cubitron (19GPa). Experimental evidence suggests that wheels made from SG have longer life, but Cubitron is freer cutting. Cubitron is the preferred grain in some applications from a cost/performance viewpoint. Advanced grain types are prone to challenge from a well-engineered, i.e., shape selected, fused grain that is the product of a lower cost, mature technology. However, it is important to realize that the wheel cost is often insignificant compared to other grinding process costs in the total cost per part.

The SG grain shape can be controlled by extrusion. Norton has taken this concept to an extreme and in 1999 introduced TG2 (extruded SG) grain in a product called ALTOS. The TG2 grains have the appearance of rods with very long aspect ratios. The resulting packing characteristics of these shapes in a grinding wheel create a high strength, lightweight structure with porosity levels as high as 70% or even greater. The grains touch each other at only a few points, where a bond also concentrates in the same way as a spot weld. The product offers potential for higher stock removal rates and higher wheelspeeds due to the strength and density of the resulting wheel body (Klocke and Muckli, 2000).

Recycling of concrete involves several steps to generate usable RCA. Screening and sorting of demolished concrete from C&D debris is the first step of recycling process. Demolished concrete goes through different crushing processes to acquire desirable grading of recycled aggregate. Impact crusher, jaw crusher, cone crusher or sometimes manual crushing by hammer are preferred during primary and secondary crushing stage of parent concrete to produce RA. Based on the available literature step by step flowchart for recycling of aggregate is represented in Fig. 1. Some researchers have also developed methods like autogenous cleaning process [46], pre-soaking treatment in water [47], chemical treatment, thermal treatment [48], microwave heating method [49] and mechanical grinding method for removing adhered mortar to obtain high quality of RA. Depending upon the amount of attached mortar, recycled aggregate has been classified into different categories as shown in Fig. 2.

Upon arrival at the recycling plant, CDW may either enter directly into the processing operation or need to be broken down to obtain materials with workable particle sizes, in which case hydraulic breakers mounted on tracked or wheeled excavators are used. In either case, manual sorting of large pieces of steel, wood, plastics and paper may be required, to minimize the degree of contamination.

The three types of crushers most used for crushing CDW are jaw, impact, and gyratory crushers (Fig.8). A jaw crusher consists of two plates fixed at an angle (Fig.8a); one plate remains stationary while the other oscillates back and forth relative to it, crushing the material passing between them. This crusher can withstand large pieces of reinforced concrete, which would probably cause other types of crushers to break down. Therefore, the material is initially reduced in jaw crushers before going through other types. The particle size reduction depends on the maximum and minimum size of the gap at the plates. Jaw crushers were found to produce RA with the most suitable grain-size distribution for concrete production (Molin etal., 2004).

An impact crusher breaks CDW by striking them with a high speed rotating impact, which imparts a shearing force on the debris (Fig.8b). Materials fall onto the rotor and are caught by teeth or hard steel blades fastened to the rotor, which hurl them against the breaker plate, smashing them to smaller-sized particles. Impact crushers provide better grain-size distribution of RA for road construction purposes and are less sensitive to material that cannot be crushed (i.e. steel reinforcement).

Gyratory crushers, which work on the same principle as cone crushers (Fig.8c), exhibit a gyratory motion driven by an eccentric wheel and will not accept materials with large particle sizes as they are likely to become jammed. However, gyratory and cone crushers have advantages such as relatively low energy consumption, reasonable amount of control over particle size and production of low amount of fine particles.

Generally, jaw and impact crushers have a large reduction factor, defined as the relationship between the input's particle size and that of the output. A jaw crusher crushes only a small proportion of the original aggregate particles but an impact crusher crushes mortar and aggregate particles alike, and thus may generate twice the amount of fines for the same maximum size of particle (O'Mahony, 1990).

In order to produce RA with predictable grading curve, it is better to process debris in two crushing stages, at least. It may be possible to consider a tertiary crushing stage and further, which would undoubtedly produce better quality coarse RA (i.e. less adhered mortar and with a rounder shape). However, concrete produced with RA subjected to a tertiary crushing stage may show only slightly better performance than that made with RA from a secondary crushing stage (Gokce etal., 2011; Nagataki etal., 2004). Furthermore, more crushing stages would yield products with decreasing particle sizes, which contradicts the mainstream use of RA (i.e. coarser RA fractions are preferred, regardless of the application). These factors should be taken into account when producing RA as, from an economical and environmental point of view, it means that relatively good quality materials can be produced with lower energy consumption and with a higher proportion of coarse aggregates, if the number of crushing stages is prudently reduced.

maden crushing and screening plants, crushers, screens, feeders uae

maden crushing and screening plants, crushers, screens, feeders uae

MADEN Crushing & Screening, continues its activities in the sector with 21 years of knowledge and experience of the rock crushing machines. Our target is to make MADEN one of the leading companies in the rock crusher equipment sector.

MADEN Machinery serves its customers in all fields such as design, manufacturing, quarry installation and erection, after-sales services and spare parts supply. We are using the best quality raw materials for our production and using high technology machinery for our all steps of manufacturing.

Jaw crushers are primary crushers which can crush all types of rocks with any level of hardness by the help of their strong design. The jaw crushers are the most important alternative for the primary crushing of especially the mid-hard and hard materials. Also, there are secondary type jaw crushers designed for the secondary crushing operation of hard materials. Features:Eccentric shaft machined by special alloy steel.Hydraulic jaw adjustment system.Heat treatment after welding.Wear resistant casting jaw plates.Automatic lubrication system.Heavy duty steel caster bearing housings.Heavy duty bearings. Specifications:(Click Image to Enlarge)

Jaw crushers are primary crushers which can crush all types of rocks with any level of hardness by the help of their strong design. The jaw crushers are the most important alternative for the primary crushing of especially the mid-hard and hard materials. Also, there are secondary type jaw crushers designed for the secondary crushing operation of hard materials.

Cone crushers are the best solution for crushing hard and abrasive materials such as basalt, granite, gabro, river gravel etc. They can reduce the total operation cost with long wear times.Maden Cone Crushers can be used for any kind of materials. even for the hardest materials, by their strong design. Features:The most suitable crusher for hard and abrasive materials like basalt, granite, river gravel etc.Rigid and reliable design.Hydraulic setting system.Different type of mantle-concave sets for different applications.Lubrication system with automation, heating and cooling system for main shaft, pinion shaft and gear lubrication. Specifications:(Click Image to Enlarge)

Primary Impact Crushers are machines that are designed for primary crushing of the soft and mid-hard materials. These crushers have high efficiency with their high capacity and crushing reduction ratio.Primary Impact Crushers are not suitable for hard rocks. Thats why the mechanical properties of the rock should be determined very carefully before deciding to use primary impact crushers. Features:Compact and rigid body design.Rotor with high inertia.Hydraulic body opening system for ease of maintenance.Easy hammer replacement.Hydraulic setting adjustment.Casting hammers with wear and breaking resistance.High reduction ratio.Heavy duty steel casted bearing housings.Heavy duty bearings.Wide feed opening wich chain curtian. Specifications:(Click Image to Enlarge)

Primary Impact Crushers are machines that are designed for primary crushing of the soft and mid-hard materials. These crushers have high efficiency with their high capacity and crushing reduction ratio.

Secondary Impact Crushers provide high capacity and reduction ratio for secondary crushing. By this secondary process, the material is prepared for the final crushing as well as producing final product size material. Since the crushed material by secondary impact crushers have cubical shape, it is suitable for usage as a product. Features:Compact and rigid body design.Rotor with high inertia.Hydraulic body opening system for ease maintenance.Easy hammer replacement.Hydraulic setting adjustment.Casting hammers with wear and breaking resistance.High reduction ratio.Heavy duty steel casted bearing housings.Heavy duty bearings.3 impact curtains. Specifications:(Click Image to Enlarge)

Secondary Impact Crushers provide high capacity and reduction ratio for secondary crushing. By this secondary process, the material is prepared for the final crushing as well as producing final product size material. Since the crushed material by secondary impact crushers have cubical shape, it is suitable for usage as a product.

Tertiary Impact Crushers are used for soft and mid-hard materials. Tertiary crushers have more fine output than secondary impact crushers and they can be used as final crushers. Features:Rotor with high inertia.Reversible rotor design and impact curtains on both sides.Easy hammer replacement.Casting hammers with wear and breaking resistance.Heavy duty steel casted bearing housings.Heavy duty bearings. Specifications:(Click Image to Enlarge)

Vertical Shaft Impact or VSI Crushers are final crushing machines that can work with all type of material. They cannot be used as secondary crusher since their maximum feed size is not big enough, but they are ideal machines for final product.VSI crusher can crush the hard and abrasive material with low operation costs because of the crushing chamber design with rock-on-rock system. Also, the product taken from VSI crushers have cubical shape and more fine. So the products of VSI crushers are very good for concrete and asphalt aggregate. Features:Special rotor design with high reduction ratio.Hydraulically opening upper body for ease of maintenance.Hydraulic belt tensioning system.ISO/SPC pulleys with 2 different rotor speed.Vibration switch.Low wear costs.Cubical shaped material production.High capacity. Specifications:(Click Image to Enlarge)

Vertical Shaft Impact or VSI Crushers are final crushing machines that can work with all type of material. They cannot be used as secondary crusher since their maximum feed size is not big enough, but they are ideal machines for final product.

VSI crusher can crush the hard and abrasive material with low operation costs because of the crushing chamber design with rock-on-rock system. Also, the product taken from VSI crushers have cubical shape and more fine. So the products of VSI crushers are very good for concrete and asphalt aggregate.

The vibrating screens with on top drive have elliptical motion. With this elliptical motion, the material move faster on the feed region of the screen and the material spread on the screen deck immediately, which provides the fine material falls down on the lower decks in the beginning of the screen.When material comes to the discharge end of the screen, it gets slow and wait more time on the screen deck. With this motion characteristics, the screening efficiency of the screen gets higher. Features:Body and drive system design completely bolt jointed without welding.Movable front chute for ease of maintenance.Easy screening media replacement by the help of wide deck space.Stepped screening area helps the efficiency.Stone-box type distributor chute with low wear.Special chute design providing to merge or feed back the decks with desired ratio.Reduced bearing size.Ease of maintenance and bearing replacement. Specifications:(Click Image to Enlarge)

The vibrating screens with on top drive have elliptical motion. With this elliptical motion, the material move faster on the feed region of the screen and the material spread on the screen deck immediately, which provides the fine material falls down on the lower decks in the beginning of the screen.

The Vibrating Screens Drive in Middle are the most common screening machines used in crushing and screening plants. These screens have a wide usage for common screening purposes with circular motion. They provide a high screening capacity with a wide range of application. Features:Body and drive system design completely bolt jointed with welding.Movable front chute for ease of maintenance.Easy screening media replacement by the help of wide deck space.Stone-box type distributor chute with low wear.Special chute design providing to merge or feed back the decks with desired ratio. Specifications:(Click Image to Enlarge)

The Vibrating Screens Drive in Middle are the most common screening machines used in crushing and screening plants. These screens have a wide usage for common screening purposes with circular motion. They provide a high screening capacity with a wide range of application.

The Horizontal Screens are used for accurate screening. Since the material speed on the screen deck is low, the material stays on the screen for longer time which provides a fine screening. Features:More efficient and accurate screening by the help of linear motion.Body and drive system design completely bolt jointed without welding.Movable front chute for ease of maintenance.Easy screening media replacement by the help of wide deck space.Stone-box type distributor chute with low wear.Special chute design providing to merge or feed back the decks with desired ratio. Specifications:(Click Image to Enlarge)

Vibrating primary feeders are used for feeding the material dumped into the primary hopper to the primary crusher. These feeders are driven by vibrator motors or mechanical drive systems with eccentric weight and gearbox.

Scalper screens are used for separation of the natural fines in the raw material. Adjustable grizzly spaces helps separation for all kind of material. Grizzly bars are designed very strong and wear resistant.

Apron feeders are used under the primary feed hoppers when the feed material includes soil or clay and gets sticky with moisture. Apron feeders prevents feeding problems even the material is very dirty and sticky with the help of strong structure and track system.

Wobbler screens are used when the raw material is dirty, humid and sticky. They provide a clean and homogenaus feeding to the primary crusher. By the help of synchronised shafts having elliptical cams on them, wobbler screens make the separation of soil and clay by preventing blockage.

Mobile Equipments provide very important solutions with their flexible and project based properties. By the help of their economical solutions, adaptation to environmental restrictions and high mobility properties, mobile equipments became very important especially for the contractor companies.

With dewatering screens, the water content of the wash materials is filtered in washing applications. The dewatering screens are driven with vibration motors which creates a linear motion. The water in the slurry filtered when material is forced to climb upward.

The Conveyor Belts are used for conveying the material between the crushing and screening stations and to the stockpiles. The width and the slop of the conveyors should be suitable for the size of the material. Usually, the conveyor belts are seen as the unimportant equipment in the plants. However, it is statistically proved that the most production loss is because of the conveyor belts problems. That is why the selection of the conveyor belt, the quality of the parts and the maintenance is very important for plant efficiency.

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