The Bond ball mill grindability test is run in a laboratory until a circulating load of 250 is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of material to .
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form cf slimes of colloidal material, is a waste both of energy and of ore values, as concentration efficiency, even in flotation, falls off in extremely fine sizes Tumbling mills are of three basic types rod, ball, and autogenous figure-3. Structurally, each type of mill consists of a horizontal cylindrical shell, provided with.
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Mill length m 0.3048 Ball charge kg 30.578 critical mill speed 70 of solids 81 Ore charge kg 5.623 Media charge Balls Ball size distribution diameter Staggered 63 to 25 mm Table 1 Pre-established conditions for the tests Donda, 2003. Using the Rowland equation Eq.1, the power was obtained by multiplying the kWb value by the ball.
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1. Introduction. As coarse grained, easily processed ore bodies are depleted, more disseminated, fine-grained ores are being treated. Adequate liberation of valuable components within a fine-grained ore is often only achieved once the particle size of the ore has been reduced to levels below the traditional ball mill cut-off of 45 m.
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studied include mill rotational speed, ball size, mill I charge and wet versus dry grinding. Breakage rates have been determined experimentally utilizing a SEMIPS image analyzer. The mineral sample used was acquired from ASARCOs Young Mine which is located in Jefferson City Tennessee. It was a binary ore consisting of sphalerite and dolomite.