Influences of Grinding on the Classification and Enrichment of Vanadium in Stone Coal

Abstract

Grinding, as an important preparation step for beneficiation is very necessary to study for the finely disseminated extent, vanadium-bearing stone coal with complex chemical composition. In this paper, grinding medium, time, degree and monomer dissociation degree were investigated in detail. The results show that the efficiency of rod milling is better than that of ball milling, especially the proportion of −0.038 mm size fraction obtained by rod milling is 10.89% higher than ball milling. The grinding degree of 8 min rod mill is −74 µm 73.19%, then the proportion of monomer is 70.68%. MLA measurement shows that roscoelite can not be dissociated by fine grinding. Vanadium concentrate with 0.97% of the grade and 89.88% of recovery was obtained by classification and shaking table technology. Tailing rate is 18.82%. The enrichment of vanadium can be realized by reasonable grinding and classification.