The operating data for a ball mill is summarized: Mill dimensions (inside liners) Mill speed Pulp density Total solids e

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The Operating Data For A Ball Mill Is Summarized Mill Dimensions Inside Liners Mill Speed Pulp Density Total Solids E 1 (59.55 KiB) Viewed 28 times

The operating data for a ball mill is summarized: Mill dimensions (inside liners) Mill speed Pulp density Total solids exiting mill Solids (ore) specific gravity Steel ball charge Density of steel ball Steel void space - 1.6m (diameter) by 3.2m 25 rpm = = = = 84% solids 40 tph (dry) 2.8 43% 7.8 t/m³ 39% (a) Express the mill speed as a percentage of the critical speed. (b) Calculate the steel ball charge for such an empty mill in tonnes. (c) Express the mill pulp density in terms of: 1. Liquid-Solid ratio (dilution ratio) 11. tonnes/m³ (d) Compute the mill feed water addition if mill feed contains 1.6% moisture. (e) Indicate the purpose of mill liners. (f) Calculate the rate of ball addition (balls per hour) if steel balls of diameter 75mm are used and consumption rate being 1.02 kg/t of ore.