1. 原料初碎PRECRUSHING OF RAW MATERIALSHard materials (硬质料) like feldspar长石,quartz (石英),may be precrushed (初碎),in order to reduce (减少) the grinding (研磨) time during preparation (制备).The hard materials are charged (装) to an impact crusher (锤击破碎机),for reduc (本文共 14039 字 ) [阅读本文] >>