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Granite Ball Mill Definition

2020-5-18In the standard A-C closed circuit ball mill grindability test the work index is found from. where Pi is the opening in microns of the sieve mesh tested and Gbp is the net grams of mesh undersie produced per revolution of the 12 x 12 test ball mill. The closed circuit 80 passing sie P averages P1log 20 for all sies larger than 150 mesh

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