Mar 08, 2019nbsp018332JXSC provides Ore Crushers and grinders globally, includes cone crusher, jaw crusher, hammer crusher, roll crusher, ball mill, etc. 1 Ore crushing process and equipment. In the concentrator, the hardness of the ore is 8 10, the grinding power index is 14 15 kWht, the moisture content is 3, and the loose density is 1. 69tm 3, Density 2. 7tm3.