In buying
crusher many technicians will ask the hardness of limestone. Different types of limestone will have different hardness, which is decided by Mhos hardness putting forward by Friedrich Mohs.
There is high, medium, and soft hardness ore. Granite and cobble belongs to high hardness material with less than 7 Mohs and needs including hard rock crusher high hardness machines to make, because this kind of machine can reduce the cost for changing spare parts. Also the high hardness material has a broad distribution of Guangdong, Fujian, or Sichuan.
Hard-rock Crusher
Normal speaking, this kind of stone in production line belongs to medium hardness rock with no more than 3 Mohs hardness. But, more foreign materials in limestone will reduce stone hardness and decrease production quality of finished material.
Soft ore refers to materials with low hardness, which can be used as the ingredient of chemical industry mixed with other materials.
Different materials are with different hardness so that you should have a material inspection and testing for suitable crushing machine.
