... High pressure trapezoid mill of Shanghai Golden Machinery Company Limited High pressure trapezoid mill Working principle The operation ... and fineness. 3. Use the high-efficiency and energy-saving centrifugal induced draft fan. The efficiency of ... dolomite, graphite, fluorite, wollastonite, phosphate rock, calcium magnesium phosphate, coal, gangue, slag, zircon sand, talc, granite, potash feldspar, ...