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Dec 18, 2013· The smallest ball size typically charged into ball mills and tower mills is ½ inch (12.5 mm), although media diameters as small as 6 mm have been used industrially in Vertimills. In a laboratory study by Nesset et al .,[ 7 ] a GIS mill charged with 5-mm steel shot, and with other operating conditions similarly optimized, achieved high energy
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Aug 01, 1995· A size-energy model is proposed for simulation of stirred ball milling. The product size distributions below 10 μm from a stirred ball mill were simulated by the model satisfactorily. The model is simple and has only two parameters. The model was tested under different milling conditions for a stirred ball mill
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Computer Simulation of Product Size Distribution of a Laboratory Ball Mill ability of breakage of the material of a given size and the size distribution of the pro- product size
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Sep 21, 2019· Tumbling mills (Rod mill) In a rod mill, much of the reduction is done by rolling compression and by attrition as the rods slide downward and roll over one another. The grinding rods are usually steel, 25 to 125 mm (1 to 5 in.) in diameter, with several sizes present at all times in any given mill. The rods extend the full length of the mill
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May 30, 2017· Effect of Ball Diameter, or Rod Diameter Variation. The first relationship to be considered is the effect of the variation of the ball diameter, or rod diameter, upon the size distribution obtained. In Fig. 6.1 are shown typical size frequency curves obtained by ball
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First, a Jar Mill grindability test requires a 5 lb. (2 kg) sample and produces a direct measured specific energy (net Hp-hr/t) to grind from the design feed size to the required product size. The second test, a
Get Price21 CONCLUSIONS Continued In the present work, equations were also derived, giving: zthe ball-mill power drawP as a function of its dimensions: internal mill diameter D and length L, zthe ball-mill power drawP as a function of the feed D f (mm) and the product size d (mm), the Bond work index w i (kWh/short ton) and the mill throughput T (short ton/h), zthe ball-mill dimensions (D and L), when
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Bond Tests Mining Sgs. P the 80 passing size of the ground product in m f the 80 passing size of the feed in m the test is a closed circuit dry grindability test performed in a standard ball mill it can be performed at mesh sizes ranging from 28 mesh to 400 mesh the normal finishing size
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size of the feed and the product ( m), respectively. Bond developed a standard laboratory test for the determination of the work index for ball and rod mills in 1952 and modified it in 1961. The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250% circulating load. The standard procedural outline of the
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Apr 27, 2019· For example, reduction to one-half of the original particle size requires about 4-3 kg cm per gm by impact as compared to 18.5 kg-cm by ball mill; that is, the energy requirements are less than 25 percent as much for impact crushing as for ball milling.
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Ball/Rod mill Literature . The Ball/Rod mills are meant for producing fine particle size reduction through attrition and compressive forces at the grain size level. They are the most effective laboratory mills for
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The experiments are carried in stirred ball mill (SBM) with ball size of 1.5mm and tip velocity 7.6m/s. The product obtained from industrial ball mill at six hours of grinding was taken and further milled in SBM. The desired product was obtained within 15 minutes. The results of the size analysis are shown in Fig.2.
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Dec 12, 2016· The ball mill motor power requirement calculated above as 1400 HP is the power that must be applied at the mill drive in order to grind the tonnage of feed from one size distribution. The
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size of the feed and the product ( m), respectively. Bond developed a standard laboratory test for the determination of the work index for ball and rod mills in 1952 and modified it in 1961. The standard Bond ball mill
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•Particles of average feed size 50 x 10(-4) m are crushed to an average product size of 10 x 10 (-4) m at the rate of 20 tonnes per hour. At this rate, the crusher consumes 40 kW of power of which 5 kW are required for running the mill empty. Calculate the power consumption if 12 tonnes/h of
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Ball mill- factors influencing the size of product. Ball mill that works on the principle of impact is an efficient technique of size reduction through grinding. The size reduction is an important factor for
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Ball/Rod mill Literature . The Ball/Rod mills are meant for producing fine particle size reduction through attrition and compressive forces at the grain size level. They are the most effective laboratory mills for
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Feed and product size distribution of a ball mill are given in the following table, Work index (Wi) of the ore ground is 12 kWh per ton, Calculate the energy required for this size reduction, If the capacity of the mill is 150 t/h, what would be the power consumption in the mill? (20 pnts) Mill Feed Wt, Size fractions (um) (%) +500 2,60 -500+400 6,25 -400+300 11,15 -300+212 18,23 -212+150 28,39 -150+106 17,75 -106 15,63 Total 100,00 Mill Product Wt, Size
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Sep 05, 2015· Calculate Top Ball Size of Grinding Media -FRED C. BOND Equation & Method. Although it was developed nearly 50 years ago, Bond 's method is still useful for calculating necessary mill sizes and power consumption for ball and rod mills
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The ball mill accepts the SAG or AG mill product. Ball mills give a controlled final grind and produce flotation feed of a uniform size. Ball mills tumble iron or steel balls with the ore. The balls are initially
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