... can be used for grinding middle hard ores such as iron ore, aluminum ore, gritstone, gypsum, blast furnace slag, coal gangue, phosphorus ... ore, and lump coal. Also, it can be used in the ... materials, such as stone, granite, trap rock, coke, coal, manganese ore, iron ore, emery, fused aluminum, oxide, fused calcium carbide, limestone, quartzite and ...