rod mill motor

rod mill | henan deya machinery co., ltd

rod mill | henan deya machinery co., ltd

Rod mill is by a rotating drum causes friction and attrition between steel rods and ore particles. Rod mills are less common than ball mills for grinding minerals. The rods used in the mill, usually a high-carbon steel, can vary in both the length and the diameter. However, the smaller the rods, the larger is the total surface area and hence, the greater the grinding efficiency.

Rod mill, it may be considered as either fine crusher or coarse grinding machine. It is capable of taking feed as large as 50 mm and making a product as fine as 300m, reduction ratios normally being in the range 15:1 to 20:1. The distinctive feature of a rod mill is that the length of the cylindrical shell is between 1.5 and 2.5 times its diameter.

sms group gmbh: bar and wire rod mills

sms group gmbh: bar and wire rod mills

What's special about our bar and wire rod mills is not only their high flexibility, but also their proven reliability. There is an array of products our state-of-the-art mills can manufacture in one mill: angles, squares, flats, channels, rounds, and wire rod. This top versatility also means you can efficiently produce all sizes, materials, and alloys.

For producing rebars with lower operational cost and to increase the efficiency we have our High Speed Delivery system HSD available, which allows to run with 45m/s onto the cooling bed. Compared to the traditional slitting method, conversion costs can be saved in the range of 6 to 13 Euro/ton. The Vertical Compact Coiler VCC is todays state of the art solution for producing compact and torsion-free coils - exactly what more and more rebar processors are requiring for automatic handling in cut and bend machines.

The new measuring gauge at the exit side of the 3-roll block applies light section technology. Using our laser/image technology, four sensors perform synchronous, contact-free measurements over the entire cross section of the bar. There are no moving or oscillating parts, making the system almost maintenance-free. It achieves a scanning rate of 500 scans per second. That's why the system can produce a true-shape cross-section from up to 400 synchronous measuring points in a shared coordination system. You can see the result displayed with utmost precision.

Our MEERdrive technology makes roll ring management significantly easier, offers exceptional pass design flexibility, and minimizes maintenance. Precise rolling process control guarantees the required end product properties. Our system also optimizes roll ring utilization and slashes energy consumption. Why? Because individual motors operate much more efficiently than group drives.

However, not only a service partner for your plants and machines, SMS group is also there for your staff. Furthermore, You can enroll on standardized and individual training programs designed for you by our SMS TECademy. That ensures you strengthen your competence as a plant owner.

Whether you require one-off equipment checks, continuous condition monitoring, remote service, or regular plant inspections: our service experts will take care of it all. You can even outsource your complete maintenance operations to us. This ensures excellent plant availability plus best production results.

When the spare parts you need are no longer available or the new generation is not 100% compatible, you risk plant standstills. That's why SMS group constantly monitors the availability of all parts and, where necessary, offers modern alternatives - even for parts from third-party suppliers. This ensures competitiveness and full productivity over the entire life cycle of your plant.

Even plants "built to last" need to be critically examined from time to time, because markets and production processes are continuously evolving. Together with you, our service experts will find the best revamp options for your requirements. Once again bang up to date, your plants will then be ready to bolster your strong position on the market.

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coal mill,rod grinder,rod mill,crushing mill,grinding rod mill,pin crusher,rod grinding machine--hongxing machinery

coal mill,rod grinder,rod mill,crushing mill,grinding rod mill,pin crusher,rod grinding machine--hongxing machinery

Henan Hongxing Machinery, a technical rod grinder manufacturer in China, is a large joint-stock enterprise integrating R&D, production and sales. Henan Hongxing Machinery is second to none in various rod mill manufacturers. In Zhongyuan District, Henan Hongxing Machinery is one of the biggest crushing mill producers. It provides various crushing mills and accessories. Coal mill is one of the key products produced by Hongxing Machinery. Henan Hongxing forms strong comprehensive innovation system by virtue of years of experience accumulation and development. Experts from Hongxing Machinery remind you that product quality must be taken into consideration.

The grinding rod mill drives the cylinder in rotation by the engine through the rotation of the reducer and big gears around with the deceleration or through low speed synchronous motor driving directly peripheral big gears. The grinding rod mill is equipped with appropriate grinding medium-steel bar, which is raised to a certain height under the centrifugal force and friction force and then cast down or discharged. The to-be-crushed materials are continuously added to the cylinder, shattered by the rotating grinding medium and discharged to the next procedure by the overflow and the power of continuously feeding in materials.

rod mill design & power draw

rod mill design & power draw

The following equation is used to determine the power that a rod mill should draw.The BottomTable lists many of the common size rod mills giving speed, loading and power data. The rod mill motor power is in horsepower at the mill pinion-shaft. For different length rod mills power varies directly as rod length.For difference between new and worn liners increase power draw by 6%, and adjust for bulk density per Table A.

Wet grinding rod mills are normally used in minerals processing plants. Experience with dry grinding generally indicates many difficult problems and should be avoided except where absolutely necessary; in which case the problem should be referred to the mill manufacturers for recommendations.

The relative efficiency for size reduction of a given material from a constant feed size to a constant product size can readily be seen as linearly proportional to the tonnage treated (directly) or the power consumed (inversely). Bond (1961) observed that material size distributions as naturally produced through stages of comminution were highly consistent, and therefore could be represented by a single value such as the 80% passing size. Secondly, from numerous observations, he derived the following approximate relationship between the per unit work applied by the comminution device and the amount of size reduction achieved, commonly referred to as the Bond Law of Comminution.

The constant in this equation is tensed the Bond Operating Work Index, Wio. Assuming Wio does not change as a function of the feed or product sire, and the ore itself has not changed, it is a direct measure of circuit efficiency, variations in circuit feed and product size taken into account.

Bond Laboratory Work Index determinations (one for each type of comminution machine) are widely used for mill sizing, but may also be used to monitor ore grindability characteristics in circuit evaluation work. In the latter case, correction factors needed for reasonably accurate scale-up to industrial size mills under various design conditions may be factored out of the basic Bond Operating Work Index, to derive the Corrected Operating Work Index, for direct comparison with the Laboratory Work Index for the same ore.

Note, however, that this corrected figure is much less meaningful than the basic Bond Operating Work Index for circuit performance evaluation purposes because it no longer pertains to the actual power efficiency that the circuit, as designed and operated, is providing. Within the limitations of the accuracy of the assumptions previously mentioned, the uncorrected Bond Operating Work Index is the true indicator of basic relative circuit efficiency, and is therefore used throughout this paper.

Precise descriptions of procedures for data acquisition are not generally included in reports on plant operating experiences, and neither is ore grindability normally monitored during plant testwork. However, it is nevertheless reasonable to reach clear conclusions about changes in relative circuit efficiency, as defined by the Bond Operating Work Index, by sensible interpretation of consistently, if not accurately, collected and reported operating data.

A table of estimates of rod mill power draw is published in Rowlands work (1982). Figures in this table are generally slightly low compared to some reported plant data or other manufacturers estimates, and are based on an empirical formula initially proposed by Bond (1961) designed to cover a wide range of mill dimensions, and the normal operating range of mill load (Vp = .35 to .50) and speed (Cs = .50 to .80). Please see the reference article for S.I. equivalents.

Note that the above equation (3), was derived to empirically relate power consumption over a wide range of mill sizes, on various slurries, as well as over a fairly broad range of mill speed and load levels, all combined into a single expression. Effects such as slurry density, media size, liner condition, and trunnion opening size are ignored. Although it still provides a close approximation, the limits of accuracy, easily plus or minus 5 to 10%, should be recognized. As well, interpretation of the concise effect of any single variable taken out of the context of the complete equation may be misleading.

grinding cylpebs

grinding cylpebs

Our automatic production line for the grinding cylpebs is the unique. With stable quality, high production efficiency, high hardness, wear-resistant, the volumetric hardness of the grinding cylpebs is between 60-63HRC,the breakage is less than 0.5%. The organization of the grinding cylpebs is compact, the hardness is constant from the inner to the surface. Now has extensively used in the cement industry, the wear rate is about 30g-60g per Ton cement.

Grinding Cylpebs are made from low-alloy chilled cast iron. The molten metal leaves the furnace at approximately 1500 C and is transferred to a continuous casting machine where the selected size Cylpebs are created; by changing the moulds the full range of cylindrical media can be manufactured via one simple process. The Cylpebs are demoulded while still red hot and placed in a cooling section for several hours to relieve internal stress. Solidification takes place in seconds and is formed from the external surface inward to the centre of the media. It has been claimed that this manufacturing process contributes to the cost effectiveness of the media, by being more efficient and requiring less energy than the conventional forging method.

Because of their cylindrical geometry, Cylpebs have greater surface area and higher bulk density compared with balls of similar mass and size. Cylpebs of equal diameter and length have 14.5% greater surface area than balls of the same mass, and 9% higher bulk density than steel balls, or 12% higher than cast balls. As a result, for a given charge volume, about 25% more grinding media surface area is available for size reduction when charged with Cylpebs, but the mill would also draw more power.

ball mill&rod mill grinding system used in mineral milling | prominer (shanghai) mining technology co.,ltd

ball mill&rod mill grinding system used in mineral milling | prominer (shanghai) mining technology co.,ltd

Grinding system is the section consuming power most in mineral processing plant. It accounts for up to 40% of the total power consumption in mineral processing plant operations. So, selecting the efficient solution for grinding section is very important.

Prominer provides ball mill / rod mill grinding system which is widely used in various types of ores' beneficiation, electricity, cement and chemical industries. It can carry out dry or wet pulverizing and can meet demand for sustainable large-scale production. Our ball mill / rod mill grinding solution for different minerals with the features as below:

Lower power consumption & operation cost Air clutch system for starting the motor safely Alternative synchronous or asynchronous motor Low speed driving unit with lifting device, convenient for maintenance. New endurable wearing parts to increase service life of vulnerable parts. Skid-mounted design with fast delivery and short erection time

Prominer has been devoted to mineral processing industry for decades and specializes in mineral upgrading and deep processing. With expertise in the fields of mineral project development, mining, test study, engineering, technological processing.

bond index ball mill / rod mill bt 100 xl - retsch

bond index ball mill / rod mill bt 100 xl - retsch

A detailed overview and knowledge of the characteristics of a raw material is of utmost importance, especially when planning the layout of a crushing plant. In order to minimize all possible risks extensive trials are necessary to obtain information on the properties of the raw materials. A clear definition of the required crushing capacities and the desired product quality can be precisely determined by using the Bond Index test methods. Using the Bond Index test procedures it is possible to calculate crushing / abrasion behavior of mineral samples. This knowledge is essential to define the required ball mill layout and production capacity.In order to perform the Bond Index Test successfully it is necessary to use pre-crushed sample material as defined below:Module Ball Mill Minerals pre-crushed to < 3.35 mm and sieved Drillcore pre-crushed to < 3.35 mm and sieved Half Drillcore pre-crushed to < 3.35 mm and sieved The Bond Index conforming ball charge consists of: 43 x 1.45 balls67 x 1.17 balls10 x 1 balls71 x 0.75 balls 94 x 0.61 balls The optimum number of grinding balls is 285. However, the ball diameters vary due to wear. Therefore, the total ball number should be adjusted from time to time to ensure a total mass of 20.125 grams. The grinding jar of the Bond Index Ball Mill measures 12 x 12 and has well-rounded corners. Module Rod Mill Minerals pre-crushed to < 12.50 mm and sieved Drillcore pre-crushed to < 12.50 mm and sieved Half a drillcore pre-crushed to < 12.50 mm and sieved The Bond Index conforming rod charge consists of: 6 rods of 1.25 diameter and 21 length2 rods of 1.75 diameter and 21 length The grinding jar for the Bond Index Rod Mill is 12 x 24 in size and has a wave-shaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill. The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas Ball Mill Work Index (BWI) is used for the range from 2.1 mm down to 100 m.Adjustment of grinding parameters:The operation display permits convenient selection and storage of parameters such as rotation counter, rotation speed, grinding time, start and stop.

The ball and the rod mill basically have the same concept comprising either a 12x12 jar with grinding balls or a 12x24 jar with grinding rods.The jar is attached to a rotating yoke which is driven by a motor and can be placed in three different positions: Upwards for loading, horizontal for grinding, downwards for discharging.To carry out the Bond Index test the pre-defined number of grinding balls or grinding rods is required. The electronic control integrated in the drive is equipped with an overload protection and permits and controls different speeds.During the grinding process the difference in speeds between the balls / rods and grinding jar produces an interaction between frictional and impact forces, which releases the required comminution energy. The interplay between these forces produces a very effective degree of size reduction.

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