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A ball mill is a type of grinder used to grind or blend materials for use in mineral dressing processes, paints, pyrotechnics, ceramics, and selective laser works on the principle of impact and attrition: size reduction is done by impact as the balls drop from near the top of the shell. A ball mill consists of a hollow cylindrical shell rotating about its axis. T
Of interest are the following: The uncorrected transfer size is, on average, times larger than the equivalent transfer size. The uncorrected ball mill operating work index is, on average, 75%of the value of the BWi, while the corrected ball mill operating work index is, on average, similar to BWi.
The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial
#183; Table I shows the Bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after LIMS. The concentrate weight recovery was in the order of 5060%. Furthermore it may be observed that the Bond ball mill work indices for the ore (Wi) varies from to kWh/t.
Oleg D. Neikov, in Handbook of NonFerrous Metal Powders, 2009. Tumbling Ball Mills. Tumbling ball mills or ball mills are most widely used in both wet and dry systems, in batch and continuous operations, and on a small and large scale.. Grinding elements in ball mills travel at different velocities. Therefore, collision force, direction and kinetic energy between two or more elements vary
the ores Bond Work Index, which will define the power requirements per tonne of rock to achieve the required product specification from the mill. This sets the basic power draw for your application and can then be used to simulate the various milling options and stages that maybe required for the downstream processing steps.
This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on around the world sample. You can find the SG of each mineral samples on the other table.
The ball mill work index laboratory test is conducted by grinding an ore sample prepared to passing mm (6 mesh) to product size in the range of 45150 #181;m (325100 mesh), thus determining the ball mill work index (Wi B or BWi). The work index calculations across a narrow size range are conducted using the appropriate laboratory work index determination for the material size of interest,
Bond Test WIs (kWh/t): Rod Mill: Ball Mill: kWh/ 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of applies from the actual rod mill feed sizeof 19,300 m#181; (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod #181;
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