| 1. | Secondary impact mills are used in the hard coal and the salt mining industry , in the gypsum limestone industry , in ceramics , in the iron and steel industry , as well as in the sector environmental technology for crushing of soft to medium - hard feed materials 二级冲压式粉碎机在烟煤业盐矿业石灰业石膏业制陶业冶金业以及环保业领域里被用来破碎从软到中硬物料。 |