... Straight Centrifugal Coarse Powder Grinder ***Raw Materials: carborundum, zirconite, quartz, granite, barite, marble, limestone, talc, gypsum, slag, porcelain, etc. ***Application: Silica sand, foundry ... ball mills which only processes fine powder. Straight Centrifugal Coarse Powder Grinder is widely applied in silica sand, foundry sand, grinding apparatus and ...