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Pls first check the technical specification for our high alumina grinding media ball as the following: 1) 92% alumina grinding ball ... Quartz Ultra Fine Grinding. Posted on 2. Feb. 2009 - 02:11 ... 02:11 Dear Mr. Morag, Cyclotec can provide dry quartz grinding P50 18-20 microns, and P80 45 microns WITHOUT CLASSIFICATION ( 96% silica content ...