spiral classifer rate

screw classifiers

screw classifiers

To be successful in a obtaining a uniform grind that is necessary to achieve a high percentage of recovery it is necessary to control the degree of fineness that the ore is reduced to. This is done by separating the fine material from the course and regrinding the coarse until it is fine enough for efficient mineral extraction.

To be able to obtain the necessary control over the amount of grinding required, a method of effective classification and separation by size must be available. For maximum effectiveness it should take place after every stage of grinding.

The types of equipment that are used to accomplish this are called CLASSIFIERS. There are three basic kinds used. The first two, the RAKE classifier and the SPIRAL or screw classifier work on the same principal, and are not often used any more. These two types were popular for many years. It wasnt until the development of the CYCLONE type classifier that their popularity faded. You may still find a few though, in the older mills and the mills that require a classification of the larger ore sizes that the cyclones are not very good at sizing. Both the rake and spiral classifiers take advantage of the natural settling characteristics of ore. Any time that slurry is allowed to flow over a surface the tendency of the ore is to graduate itself into layers of different sized material. The larger sizes will be on the bottom, these are also the ones that are the slowest moving. As you come closer to the surface, the material will become smaller and faster until the very finest and the easiest to wash away is on top.

To understand how these two classifiers make use of this settling action, a description of them is required. First, to have the classification happen, the slurry must be able to flow. This means the classifiers must be inclined. The working portion of these two classifiers are the RAKES or SPIRAL/screw which are placed into the flow of ore. To separate the course material from the fine, the rakes and spiral make use of the same theory, but differ in its application. The theory is, as the slurry flows down the inclined bed of the classifier it will separate into different sizing. The larger ore that is on the bottom will not be flowing as fast as the light ore on top.

To separate the two, the rakes and the spiral will pull the all of the slurry back up the incline, then, let it go to flow back down towards the underflow or in this case the fine ore discharge point. The smaller, faster ore will be able to travel a longer distance than the large particles before the rakes or spiral will pull the ground material back towards the coarse ore discharge. If the Classifier is able to pull the course ore backwards further than it can travel forwards, then eventually the bigger particles will be pulled all the way to the top of the incline where they will be discharged. The smaller faster pieces of ground rock will end up at the bottom of the incline to be discharged as fine material that is ready for the next stage of processing.

This type of classifier will do away with the necessity of pumps. The length of the incline that is needed is long and steep enough to have the material lifted to the feed end of the mill. The flow of the finer ore will run down hill to the next piece of equipment. The concentrator that used this type of classification was built on the side of a hill to make use of gravity to get the material from one stage of production to the next. It was because of this that this type of concentrator was referred to as a GRAVITY FLOW/MILL. I used the past tense in this paragraph because this design of mill is no longer in use.

I want to know what is the range of the % Solids content in overflow from screw/spiral classifier in Hematite Iron ore washing for efficient operation of classifier. I also want to know what is Auto dilution in thickener. Does Auto dilution has any effect on Pumping capacity of clarified water from thickener.

Each operation is different, but the good news is that you can simply determine the solids % wt. in the SOF, try 2 -3 times daily over one week, get a profile. If below 5% wt., you may not need auto dilution, also depending on ore and grind size. This is almost a clarifier regime, often workable without rakes in certain units. Above 5% in general start looking at auto-dilution before adding the flocculant do this off-line. Make sure that the thickener underflow (TUF) discharge comes out continuously, otherwise you may need to play with the lifters, if you have them. The UF solids % wt. must be correlated with the yield stress.look for 30 Pa high-end cut off value for lean operation. When the ore or grind size changes, you need to repeat the evaluation.

My take on these classifiers is that the clear water added to the classifier feed determines the size of the largest heaviest particle going to the overflow. This is the criteria that you should be working to achieve. As you probably have more than one classifier reporting to the thickener you will need to perform the solids percent in each overflow. As you add water to the classifier feed, the separation efficiency increases. You should be raising or lowering the discharge weir to attain the desired size cut. Only if the thickener becomes overloaded should you add water. Pumping excess water adds cost and wear to pump trains.

Pulp density of the Overflow defines % of solids in thickener. This solids% depends also up on quality of recycle water used in spiral processto know quantum of solids..you have to give feed quantity and underflow quantity.

The % solids in classifier overflow may vary in wide range, its all depends on your ore characterisation and operating variables. For the same operation we used to get 15-18% solids as my ore contains too much fines & this is not end process in our case.Try to concentrate on end products. Do not let go valuables in your final tailings.



EIMCO-K.C.P. Spiral Classifiers is art of separating the solid particles in a mixture of solids and liquid into fractions according to particle size or density by methods other than screening. In general, the products resulting are (1) a partially drained fraction containing the coarse material (called the underflow) and (2) a fine fraction along with the remaining portion of the liquid medium (called the overflow). The classifying operation is carried out in a pool of fluid pulp confined in a tank arranged to allow the coarse solids to settle out, whereupon they are removed by gravity, mechanical means, or induced pressure. Solids which do not settle report as overflow. EIMCO-K.C.P. Spiral Classifiers are mechanically the devices are powerfully built, and functionally they are versatile and flexible. Todays worldwide acceptance of EIMCO-K.C.P. Classifiers for washing and dewatering pulps, and in closed-circuit grinding is the result of many years of experience in solving wet classification problems. Because users needs vary so greatly, the Classifier is available in a wide range of spiral diameters and pitches, tank shapes and lengths allowing exact compliance with each users classification requirements. Spiral diameters (0.3 m to 2.25 m): Important in establishing a correct balance between overflow and raking capacity. Bears directly on accuracy of separation and control of agitation. Spiral pitches (single / double / triple): Number of ribbons is a factor in controlling degree of agitation. Each ribbon of advanced pitch gives greater raking capacity than equivalent ribbon of spiral using lesser pitch. Triple ribbon spiral highly advantageous for slow-speed operations requiring close separations and high raking capacities. Adjustable spiral speeds: Recommended speed of operation given in peripheral MPM is an individual consideration for each ore, and is governed by size, shape and gravity of particle, angle of repose of raking load and desired mesh of separation. Peripheral speeds between 6 and 60 meters per minute are available. Pool depth: Choice of pool depth is directly related to effectiveness of pool area. Series 90 units are employed for coarse separations on down to 212 micron (65 mesh); Series 125 units are employed for separations between 300 and 106 micron (48 and 150 mesh); Series 150 units are employed for separations of 150 micron (100 mesh) and finer. Lifting device: Lifting device eliminates necessity of draining tank during shutdowns. Classifier may be quickly put in operation after shutdown with tank fully sanded. Hydraulic-type standard on all units 1.2 m in diameter and larger. Fast action hand wheel-operated screw- type lift standard on 1.05 m and smaller.

The EIMCO-K.C.P. equipment product line consists of Liquid Solid Separation products for the Mining, Mineral & Metallurgical Process, Chemical Process, Food Process, Refinery, Pulp and Paper, Power Plant, FGD System, Municipal & Industrial Waste and Water Treatment and with a wide range of related services.

2021-2027 global duplex twin spiral classifiers market cagr, trends, opportunities, production and consumption comprehensive analysis and impact of covid-19 - marketwatch

2021-2027 global duplex twin spiral classifiers market cagr, trends, opportunities, production and consumption comprehensive analysis and impact of covid-19 - marketwatch

The key purpose of this Duplex Twin Spiral Classifiers Market report is to deliver a definite and strategic analysis of this global industry. The report evaluates every section and sub-segments presents in Duplex Twin Spiral Classifiers market. It provides some insightful facts into the business parameters by accessing the market growth, consumption volume, the forthcoming market trends, and also the different prices variation for the forecast year. In this analysis Duplex Twin Spiral Classifiers report, except the trends, the driving forces, restraints, and opportunities have also been taken into consideration to see the markets future.

Duplex Twin Spiral Classifiers in global report offers a comprehensive guide to the size and shape of the market at an international level. It provides the latest retail sales data, allowing you to identify the sectors driving growth. Duplex Twin Spiral Classifiers market report recognizes the leading companies, the top brands and offers strategic analysis of key factors influencing the market considering governmental, distribution or pricing issues. Forecasts to 2027 illustrate how the market is set to change.

Duplex Twin Spiral Classifiers Summary: Spiral classifier is widely used in closed circuit ball mill for grading ore, sliting gravity plant, grading granularity, ore beneficiation and dewatering. There are two types of spiral classifier, single spiral classifier and double spiral classifier.The report assists with breaking down top makers, districts, and in like manner covers industry deals channel, wholesalers, vendors, research findings, and conclusion. The report discloses the shortest and durable growth projections of the global Duplex Twin Spiral Classifiers market. The report provides the scope of different segments and applications that can potentially influence the market in the future. It constitutes trends, restraints, and drivers as well as key challenges that are required to market growth in the projection period from 2020 to 2026. In addition, the report drops light on different opportunities, growth prospects, major segmentation, and challenges.

Additionally, the report provides accurate figures for production by region in terms of revenue as well as volume for the same period. The report also includes production capacity statistics for the same period.

Sales by Region: North America, U.S., Canada, Europe, Germany, France, U.K., Italy, Russia, Asia-Pacific, China, Japan, South Korea, India, Australia, Taiwan, Indonesia, Thailand, Malaysia, Philippines, Latin America, Mexico, Brazil, Argentina, Middle East and Africa, Turkey, Saudi Arabia, U.A.E

To view the original version on The Express Wire visit 2021-2027 Global Duplex Twin Spiral Classifiers Market CAGR, Trends, Opportunities, Production and Consumption Comprehensive Analysis and Impact of COVID-19

spiral classifiers

spiral classifiers

The Spiral Classifier is available with spiral diameters up to 120. These classifiers are built in three models with 100%, 125% and 150% spiral submergence with straight side tanks or modified flared or full flared tanks. All sizes and models are available with single-, double- or triple-pitch spirals.

The tank is heavy plate with strong structural base. The extra heavy shaft has an improved submerged bearing. The greatest improvements, however, are found in the drive-unit which has been strengthened and improved over all other classifiers. A specially designed classifier reducer eliminates the over hang or cantilevered load normally found where the reducer shaft carries the pinion. The Classifier Reducer has an outboard bearing integral with the reducer base which provides positive alignment of the bevel gears.

The gears themselves are greatly improved as they are cast from metal patterns which have cut teeth. The accuracy of the patterns and the quality gear castings result in a cast-tooth gear of cut-tooth quality. The gears mesh smoothly, have greatly increased capacity and are noticeably more quiet than other spiral classifiers.

Spiral Classifiers are available in sizes up to 120 diameter, three tank styles, single, double and triple pitch spirals, three degrees of spiral submergence flexibility to provide a unit built for your job. Write for detailed recommendation on the correct size and type of Spiral Classifier to do your job economically and profitably.

This is the best method of determining the required pool area. However, if settling tests have not been made and it is inconvenient to make tests, the following procedure, which has been proved to be entirely satisfactory, may be used.

Example: Assume it is desired to overflow 100 tons of dry solids per 24 hours at 65 mesh in a pulp of 20 % solids. Table I shows that 6.43 tons will overflow per sq. ft. of effective pool area. Therefore, to overflow 100 tons in 24 hours, a classifier with 15.5 sq. ft. (100 divided by 6.43) effective pool area would be required.

For a 65 mesh separation it is preferable to set the classifier at 3 slope. Table II shows that at 3 slope the 30 Cross-Flow Classifier has an effective pool area from 12.9 to 16.4 sq. ft. depending on the height at which the weir is set. Therefore the 30 classifier would be the proper size for the overflow capacity desired.

Table III shows that at 65 mesh a peripheral speed of 44 ft. per min. is recommended, which on the 30 classifier corresponds to 5.6 R.P.M. At this speed the 30 classifier will convey 275 tons of solids per 24 hours, which then is ample for this job. Therefore, this size Cross-Flow Classifier will satisfy all the requirements of this problem.

But, suppose the circulating load required was 300% instead of 250% specified above. The amount of sand to be raked would be 300 tons per 24 hours. In this case it would be necessary to speed up the conveyor of the 30 classifier above the normal speed of 5.6 R.P.M. in order to handle the 300 tons of sand. In speeding up the conveyor more agitation is produced in the tank and settling is interfered with, resulting in a slightly coarser overflow. In this case it might be necessary to provide a 36 classifier.

If the classifier is to be used in open circuit it may be the shortest standard length made in that particular size. For installation in a closed grinding circuit the classifier length must be pre-determined to assure that it will close circuit with the ball mill. This is entirely a mechanical problem and the correct length is determined by making a ball mill-classifier layout to scale.

The pool area varies with the slope and since capacity at a required mesh depends on pool area, the slope cannot arbitrarily be changed to accomplish a closed circuit. With the classifier size and slope established it is necessary to make the classifier of sufficient length to close the circuit.

In general the classifier should be installed with a slope of from 3 to 4 in 1 ft. The steeper the slope the less the pool area of a given size classifier. The less the pool area the less the capacity. The maximum capacity for any mesh separation is obtained at a slope of about 3 in 1 ft. But, for very coarse separations it may be necessary to increase the slope and thus decrease the pool area so as not to cause overloading.

65 to 150 mesh3 per ft. 48 to 100 mesh3 per ft. 35 to 65 mesh..3 per ft. 28 to 48 mesh..3 per ft. 14 to 35 mesh4 per ft.

The launder from ball mill discharge to the classifier should have a slope of about 1 per ft. depending on fineness of grind and pulp density. The launder from sand discharge of the classifier to the ball mill scoop box should have a slope of from 4 to 6 per ft.

The speed of the conveyor should be just sufficient to handle the sands to be removed. The slower the speed the less the agitation in the pool and the finer the overflow. The lower the speed the longer the life of the classifier and all wearing parts.

Most efficient grinding is effected by removal of material from the ball mill as soon as it has been reduced to the required size. This eliminates over-grinding and permits utilizing all of the power applied to the ball mill in actually grinding the oversize material. This may be accomplished by using the Cross-Flow Classifier in closed circuit. The entire ball mill discharge goes to the classifier which separates the material ground to the desired size; returning the oversize material to the ball mill.

The Cross-Flow Classifier is ideal for this closed-circuit work. Its exclusive Cross-Flow principle of operation results in an extremely accurate separation. Various lengths of this classifier and variation in slope make it possible to fit the classifier to the circuit without use of expensive, troublesome equipment such as elevators, pumps, etc.

In closed grinding circuit separations are easily and efficiently made at from 20 to 100 mesh sizes. Normally, it is considered best practice to use a Hydroclassifier for separations at 100 mesh and finer. Efficiency of separation in fine mesh range requires a very large pool area. Thus, the Hydroclassifier, with its large surface area gives more efficient classification, more economically, than is possible with a spiral classifier.

Usually such separations are made on dilute pulps with a relatively small amount of slimes. Under these conditions a mechanical classifier can make efficient separations at a much finer mesh than in a closed grinding circuit where there is a higher density pulp and larger percentage of fines. The Cross-Flow Classifier will efficiently handle sand- slime separations in the range from 150 to 325 mesh, with a minimum amount of dilution water.

The Cross-Flow Classifier provides an efficient means of dewatering sands and concentrates or other granular material. A common application in this work is when the granular material is difficult to handle in a thickener. Also in many cases, where tonnage is not large, classifiers are considerably more economical than a thickener-filter installation lower in first cost lower in operating and maintenance costs require practically no attention.

A very common application of classifiers is in washing granular material to remove reagents, liquors, etc. Classifiers have the same advantage on small tonnage as in the case of dewatering lower initial and operating costs and less attention required. The particles to be washed pass successively up the inclined tanks of several classifiers, while the wash passes through the classifiers in the opposite direction. In each classifier the pulp is diluted, mixed and rabbled, the particles washed, and the liquid removed resulting in a thoroughly washed and cleaned final product.

STAND: For convenience in installing, these smaller sizes are provided with steel legs. The stand is made to give the most commonly used slope of 3 inches per foot. SHAFT: Solid, square steel. FLIGHTS: Hard, cast iron; made in short segments which fit over the square shaft. Flights may be placed on shaft so that blades form a continuous spiral, or may be staggered to obtain an interrupted spiral. DRIVE: Enclosed worm-gear speed reducer driven by motor through V-belts; cone pulleys are used to permit speed variations desirable in experimental laboratory or pilot plant work.

SHAFT: Heavy steel pipe. FLIGHTS: Hard, cast iron; made in short sections; bolted to cast iron arms which are carried on the shaft. Easily replaceable without draining tank. DRIVE: Bevel gear driven by gearmotor through sprocket and chain. Speed of drive is determined by the requirements of each installation. A variable speed drive may be furnished, at extra cost, if desired.

SHAFT: Heavy steel pipe with steel reinforcing sleeve at the lower bearing. FLIGHTS: Steel plate; bolted to cage which is carried by steel pipe shaft. Hard, cast iron wearing shoes, made in short sections, are bolted to the steel flights and are easily replaceable without draining the tank. DRIVE: Cast steel bevel gear and bevel pinion driven from a countershaft through spur gears; gearmotor and V-belts to countershaft. Speed of drive is determined by requirements of each installation. Variable speed drive may be furnished, at extra cost,if desired.

SHAFTS: Same as for corresponding sizes of simplex classifiers. FLIGHTS: Same as for corresponding sizes of simplex classifiers. DRIVE: Heavy cast steel bevel gears and bevel pinions, driven from countershaft through heavy spur gears; gearmotor and V-belt or chain drive. LIFTING DEVICE: Same as for corresponding sizes of simplex classifiers. CONVEYOR ROTATION: The two helical conveyor flights rotate in opposite directions, thus conveying the sands up the center of the tank giving free drainage back along both sides of tank.

used sand classifiers for sale. arena equipment & more | machinio

used sand classifiers for sale. arena equipment & more | machinio

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screw classifier|spiral classifier|screw sand washer - henan fote machinery co., ltd

screw classifier|spiral classifier|screw sand washer - henan fote machinery co., ltd

The spiral classifier adopts the working theory of different particle sizes and weights leading to different settling velocities. The fine mineral particles overflow and the coarse particles sink to the bottom of screw classifier and then are discharged from the upper end of the tank by the spiral shaft. The screw sand washer or screw classifier can filter the powder materials ground by the grinder and then screw the coarse materials to the receiving port of the grinding machine. Finally the filtered fine materials are discharged from the overflow pipe. The bottom of the spiral classifier is made of box iron and the main frame is welded with the steel board. The water head, shaft head of the spiral shaft is made of pig iron which features strong wear resistance. And there are two kinds of lifting devices: power driven one and manual operated one.

The spiral classifier or screw sand washer is widely applied by the dressing plant together with the ball mill as the closed cycle or applied to separate ore sand and fine mud by the gravity mill. There are many types of screw classifiers such as spiral separator and screw classifier. The screw sand washer is also used to grade the pulp particles in the metal beneficiation process and to remove mud and water in the ore beneficiation. Fote spiral classifiers have the advantages of simple structure, reliable performance and simple operation.

Model Spiral Diameter (mm) Trough Length (mm) Spiral rotate speed (r/min) Processing capacityt/d Motor Power kw Dimensions mm Total weight t Sand -return Overflow For driving For lifting Length Width Height FG-3 300 3000 12-30 80-150 20 1.1 ---- 3850 490 1140 0.7 FG-5 500 4500 8-12.5 135-210 32 1.1 ---- 5430 680 1480 1.9 FG-7 750 5500 6-10 340-570 65 3 ---- 6720 980 1820 3.1 FG-10 1000 6500 5-8 675-1080 110 5.5 ---- 7590 1240 2380 4.9 FC-10 8400 675-1080 85 7.5 ---- 9600 1240 2680 6.2 FG-12 1200 6500 4-6 1170-1870 155 7.5 2.2 8180 1570 3110 8.5 FC-12 8400 1170-1870 120 7.5 2.2 10370 1540 3920 11.0 2FG-12 6500 2340-3740 310 15 4.4 8230 2790 3110 15.8 2FC-12 8400 2340-3740 240 15 4.4 10370 2790 3920 17.6 FG-15 1500 8300 4-6 1830-2740 235 7.5 2.2 10410 1880 4080 12.5 FC-15 10500 1830-2740 185 7.5 2.2 12670 1820 4890 16.8 2FG-15 8300 2280-5480 470 15 4.4 10410 3390 4080 22.1 2FC-15 10500 2280-5480 370 15 4.4 12670 3370 4890 30.7 FG-20 2000 8400 3.6-5.5 3290-5940 400 11-15 3 10790 2530 4490 20.5 FC-20 12900 3210-5940 320 11-15 3 15610 2530 5340 28.5 2FG-20 8400 7780-11880 800 22-30 6 11000 4600 4490 35.5 2FC-20 12900 7780-11880 640 22-30 6 15760 4600 5640 48.7 FG-24 2400 9130 3.67 6800 580 15 3 11650 2910 4970 26.8 FC-24 14130 6800 490 18.5 4 16580 2930 7190 41.0 2FG-24 9130 13600 1160 30 6 12710 5430 5690 45.8 2FC-24 14130 13700 910 37 8 17710 5430 8000 67.9 2FG-30 3000 12500 3.2 23300 1785 40 8 16020 6640 6350 73.0 2FC-30 14300 23300 1410 ---- ---- 17091 ---- 8680 84.8 Model Spiral Diameter (mm) Spiral rotate speed (r/min) FG-3 300 12-30 FG-5 500 8-12.5 FG-7 750 6-10 FG-10 1000 5-8 FC-10 FG-12 1200 4-6 FC-12 2FG-12 2FC-12 FG-15 1500 4-6 FC-15 2FG-15 2FC-15 FG-20 2000 3.6-5.5 FC-20 2FG-20 2FC-20 FG-24 2400 3.67 FC-24 2FG-24 2FC-24 2FG-30 3000 3.2 2FC-30

Through long-term arduous technology research and international communication, our product quality has been in line with international level, winning a world-wide acclaim and honor, and our products are exported to ninety countries and regions like Tanzania, Nigeria, South Africa, Kenya, Turkey, Saudi Arabia, Philippines, Indonesia, Malaysia, Vietnam, Mexico, Brazil, Russia, Uzbekistan, Australia, etc.

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