What is the relationship between grinding and sorting?

Grinding is the continuation of the crushing process and the last processing of the ore before sorting. The purpose of grinding is to achieve the separation of all or most of the useful ingredients in the ore. At the same time, we must try to avoid the phenomenon of "over-grinding". And can achieve the granularity required for the sorting operation, in order to create conditions for the sorting operation to effectively recover the useful ingredients in the ore.

A lot of grinding work and sorting operations, sorting good and bad indicators (quality of concentrate and metal recovery), and to a large extent, on the quality of grinding minerals. If the fineness of the grinding product is not enough, and the mineral particles do not reach sufficient monomer separation between each other, the selection index will not be too high, and the slime produced by the over-grinding can not be effectively recovered by any of the beneficiation methods. For example, a strong magnetic separator can effectively recover sludge with a lower particle size of 30 microns and less than 30 microns. The lower limit of the particle size that can be effectively recovered by the electrostatic concentrator is 25 microns. If it is less than 25 microns, it is difficult to recover the slime. For froth flotation, the lower limit of the effective recovery is 3 to 5 microns. If a large amount of slime (ie, less than 3 to 5 micron ore) is produced due to grinding, the consumption of the flotation agent will increase, the selectivity of the flotation process will be lost, and the recovery rate and concentrate grade will be affected. In severe cases, it may even make flotation difficult to proceed normally.

Grinding operations also have a lot to do with the economic indicators of beneficiation. Grinding is one of the most power-consuming operations of the concentrator. Only crushing and grinding accounts for 45% to 65% of the power consumption of the plant. At the same time, grinding operations are also a lot of work that consumes metal. According to statistics, when grinding 1 ton of ore, the total loss of grinding media (such as steel balls or steel bars) and linings is 0.4-3.0 kg. Therefore, in the entire ore dressing cost, grinding costs account for a large proportion.

It can be seen that improving grinding operations, increasing the productivity of grinding machines, improving the quality of their products, and reducing the cost of grinding not only improve the quality of concentrates and metal recovery, but also are important for reducing the total cost of ore dressing and increasing the productivity of the concentrator. The meaning.

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