... sand production line features: 1)Simple structure 2)High crushing ratio 3)Low noise 4)No ... fine crushing area, such as iron ore, non ferrous metal, emery, bauxite, quartz sand, basalt, etc. ... protection is selected. The motor has features of high efficiency, low noise, etc.Typical Artificial Sand Production ... 40<45<50Hard material<30<35<40<45Rotation speed (r/min)1700~18901520~16901360~15101180~1310Power ...