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The crushing and grinding of the ore is a preparation before the sorting. The prerequisite for mineral processing is to achieve the separation of useful minerals in the ore. Since the useful minerals have a small particle size, it is often necessary to grind the ore very finely to achieve a monomer separation. . The ore from the stope is very large. For example, the mining block of the exposed mining can reach a maximum of 1000-1500 mm, so it is necessary to crush the nugget up to 1500 mm to only a few tens of microns (1 micron-10-3). Fine particles of millimeters, the same below, often have to be completed in several stages. In terms of crushing, in large-scale plants, coarse, medium and fine three-stage crushing (also using four-stage) is adopted, so that the size of the ore block is gradually reduced to about 8 to 25 mm, and then sent to a grinding machine for grinding. . Until the useful mineral particles can achieve monomer separation, the grinding is usually one or two stages, sometimes up to three stages. The division of the number of fractures and grinding is roughly as shown in Table 2-3. 
It should be noted that the division of the number of crushing and grinding sections in Table 2-3 is relative, which is related to the size of the plant, the type specification of the crushing and grinding equipment, the requirements for product fineness and other conditions.
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