Crushing and grinding of the stone is the preparation job before mineral separation. The beneficiation prerequisite is to make useful mineral ore to reach monomer separation. Because useful minerals in the presence of monomers of granularity are small, it is sometimes necessary to get ore milled to be less than 0.074 mm (accounted for 80% of the fineness), or even finer, in order to make some sort of useful minerals reach monomer separation.
Stone block from the quarry has big size, such as in open-pit mining, some block can even be up to 1000 mm, so, in order to crush block with size 1000 mm into only microns (1 micron = 1/1000 mm) fine-grained, often have to be completed in several stages.
In the large scale crushing plant, usually three-stage crushing (coarse, medium and fine) is adopted, using four-stage crushing also exists, so that the lump ore granularity can be gradually reduced to 8-25 mm, and then they are sent to the grinding machine for further grinding until the useful mineral particles can reach the monomer separation.
Grinding is usually one stage or two. Dividing stages of the crushing and grinding is roughly relative, it is also has relations with the scale of the processing plant, types & specifications of the crushing and grinding equipments, product fineness requirements and other conditions.
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