The FP series mineral sizer crushed the ores and materials by the combined action of shearing, bending and splitting. Because of adopting low rotation speed and special tooth pattern (the crushed tooth of mineral sizer is arranged in spiral pattern, strong ability to hold the big material block.), the size smaller than the expecting will be quickly discharged from the tooth gap, without crushed, the powder and fine finished product is little. FP mineral sizer has got the right of use for coal mine underground safety signs, so it could be installed and operated in the pit.