Comminution Energy Reduction by Two - Stage Classification
Energy savings increase as the fineness of grind increases.
As recycle ratio decreases, energy savings increase.
Energy consumption savings ranged from 7 to over 40% to date.
For existing ball mills either capacity can be increased at the same grind or a finer grind can be produced at the same tonnage rate.
Overgrinding is reduced at the percent minus 400 mesh is always less than single stage at the same grind.
Pilot plant results to date exhibited 6 to 8 percentage points greater amount of minus 400 mesh solids by two stage classification at constant energy input and similar product production rate.
Two stage countercurrent classification yields a slightly lower product solids concentration.
KeywordsEnergy Saving Ball Mill Stage Classification Mesh Solid Energy Consumption Saving
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