... sieving through years of research and at last won the n national patent .The machine is suitable for all kinds ... haw powder , 320-500 meshes zinc powder , 500 meshes black iron oxide , red iron oxide , 120—160 meshes Chinese ... starch , milk powder , metallurgy powder , electromagnetic materials , copper powder , carbon black , active carbon , light calcium carbonate , iron ore sand ect .4.Features high ...