... Fineness of the finished product can be adjust. Stone mill, rock mill, ore mill:HGM Three-Rings & Medium-Speed MicroPowder ... fine and super fine powder. It is mainly used to process more than 200 kinds of non-inflammable, non-explosive and brittle materials ... , tablite, ceyssatite, barite, gypsum, alunite, black lead, fluorite, phosphate rock, potassium ore, floatstone etc. When HGM mills are used to ...