For overflow ball mills, the charge should not exceed 45% of the mill volume . For grate discharge mills, the charge should occupy about 50% of the mill volume . Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, i.e.,
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Get PriceBall consumption varies with the fineness of the product hardness of the ore quality of ball and whether a mill is run in closed or open circuit. The ball consumption for mills delivering a coarse product all passing 8-mesh- and containing 10 to 20 per cent. below 200-mesh the mill being run in open circuit.
Get PriceClosed-circuit systems. The efficiency of the early stages of grinding in a ball mill is much greater than that for formation of ultra-fine particles, so ball mills operate most efficiently by making a coarse product, the fine fractions of this then being separated, and the coarse part being returned to the mill inlet.
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