Gringing machinery,roller mill,raymond mill: 1. ... mill is widely used in making fine powder or micro powder, a new kind of machine for ... magnetite, iolite, pyrophillite, vermiculite, meerschaum, attapulgite, diatomite, barite, gypsum, alunite, graphite, fluorite, phosphate ore, potassium ore pumice, etc ... and the ring for grinding.The grinded powder goes into classifier along with the circulation ...