PNT-type silicon carbide slurry pump, sewage pump set to PN-type silicon carbide loaded liner and pump impeller with silicon carbide, silicon carbide slurry composition. Maintained a PN-type sewage pump pump chamber flow channel dimensions and characteristics. Silicon carbide lining and the pump impeller is pressed silicon carbide, sintered, high hardness, corrosion resistance, and rubber lined pump, alloy pump can be increased compared to the life 5--10 times, especially for tailings transport