Pumice Industrial Powder Grinder SBM Ultrafine Powder . the pumice industrial powder mill includes an ultrafine ring roller mill and ultrafine vertical roller mill, which can grind pumice to 3000 mesh. in addition to grinding pumice, it can also grind more than 100 other nonmetallic ores. such as mica, carbon black, fly ash, vermiculite, marble, dolomite, and so on.