Grinding Of Rock Phosphate. grinding process for phosphate rock,phosphate rock grinding mill. phosphate rock grinding mill is mainly applied to non-inflammable, non-explosive and brittle materials with mohs' hardness scale under seven, such as calcite, chalk, limestone, dolomite, carbon black, bentonite, kaolin, talc, mica, magnesite, illite, pyrophyllite, roseite, sea-, attapulgite ...