2. HGM Ultrafine grinding mill for rCB HGM Ultrafine grinding mill is also named HGM micro powder grinding mill.It can be used for pumice, activated carbon, limestone, calcite, marble, talc, barite, gypsum, dolomite, bentonite, mica, pyrophyllite, sepiolite, diatomite, graphite, alumite, fluorite, potassium feldspar, Phosphate rock, …