... The pallet knife system is under the grinding roller. With co-rotation of pallet knife and grinding roller, pallet ... quartz, feldspar, calcite, dolomite, graphite, fluorite, wollastonite, phosphate rock, calcium magnesium phosphate, coal, gangue, slag, zircon sand, talc, granite, ... consideration in its designing process, and can match well with the desulphurizing equipments, it is able to improve ...