... , 2.large capacity, even granularity, convenient maintenance hard rock breaking machine used in mining work 1.Usage and ApplicationImpact ... medium hardness ore, such as limestone, quicklime, slag, calcium salt, clay mine, building materials, coke, coal and other materials ... 300PF-15201500×20001315×2040300-500400-450skype zzaixmachine008618237112105 hard rock breaking machine used in mining work