... long lifetime of spare parts 3. high safety and reliability High Quality Micro Powder Grinding MillThe Three Ring Micro Power ... , gypsum, dolomite, bentonite mud, mica, pyrophyllite, sepiolite, diatomite, graphite, alunite, fluorite, potassium feldspar, phosphorite, pigment and so on. ... via discharge valve. The air with very little powder is purified by pulse dust catcher and discharged by blower ...