e is: after the raw materials were put into crushing chamber, the high-speed operated hammer sheets will impact the raw materials over and over again, then the raw materials will be crushed into pre-set size step-by-step. The sieve have the following size: 1.5mm, 2mm, 4mm and 6mm. Then the crushed materials will leak out from the sieve. The draught fan will convey the leaked materials into separator centrifuge, finally, the powder will be discharged down below, and the air will be discharged upp