... , calcite, potash feldspar, talcum, marble, limestone, ceramic, glass, etc for ultra-fine powder processing of 280 materials Raymond grinder can be used ... Principle of raymond millFirstly, raw material is crushed by jaw crusher to the size required, then elevated into a hopper from ... fan back into the grinding chamber for regrinding and the fine powders are blew into the cyclone and poured out through ...