Effect of ore properties on grinding process

1. The effect of ore grindability Ore grindability refers to the difficulty of grinding the ore from a certain grade to the specified particle size, which is measured by the grindability coefficient (grindability) of the ore. It reflects the effect of the physical properties of the ore on the productivity of the mill and the efficiency of the grinding. It is expressed in relative quantities:

Where K is the grindability coefficient (grindability);
q 0 —— the productivity of grinding a medium hard ore by a grinding machine;
q - The grinding grinds the specified ore's productivity under the same conditions (the same ore size and grinding grain size).
The medium hard ore is usually represented by quartz , and its grindability coefficient is set to 1, and other ores are compared with it. Hard ore has high strength and the grindability coefficient is less than 1.
The grindability coefficient of the ore is related to the mechanical strength, grain size embedding characteristics and grinding ratio of the ore. The harder the ore is, the smaller the grindability coefficient is. The longer it takes to grind it to the specified particle size, the more energy it consumes, so the productivity of the mill is lower; on the contrary, the productivity is higher.
2. Influence of the size of the inlaid cloth In the same ore, the grain size of the useful mineral is not completely uniform, so the ore with coarse grain size will be pulverized during grinding, and the ore with fine grain size is not yet Achieve the problem of monomer dissociation. Both of these conditions reduce the technical efficiency of grinding. The finer the size of the mineral inlay, the finer the grinding size is required to achieve monomer dissociation, so a longer grinding time is required, which reduces the grinding production capacity.
3. Influence of ore size and grain size of grinding products The size of the material to be milled has a great influence on the productivity of the mill, especially the energy consumption. The general rule is: when the grinding fineness is the same, the finer the feeding size of the grinding machine, the higher the processing capacity of the grinding machine and the lower the energy consumption. Therefore, we must promote "more and less grinding." When the ore size is the same, the finer the grinding product, the lower the processing capacity of the grinding machine, and the higher the energy consumption.
Reducing the grain size of the mill can increase the productivity of the mill because the grinding time required to grind to the specified particle size is shortened, and the acceptable fraction of the grade in the feedstock is increased. This part does not need to be ground again, so the mill The productivity of mining machines has increased accordingly.
However, it is also uneconomical to make the feed size of the mill too fine. The ore feed size of the mill should be appropriate. The most reasonable mill feed size should be the lowest total cost of the crushing plant and the grinding plant. The relationship between the cost of crushing and grinding and the particle size of the mined product can be represented by the following figure.

Someone once by mill productivity and to technical and economic relations between the ore particle size analysis, summary of a variety of different sizes beneficiation plant mill the most appropriate feed size range, are listed in the following table.

In the case of the same ore size, the mill productivity decreases as the grain size of the milled product decreases. The finer the grinding product is required, the more the productivity drops. However, for the coarse grinding process, the effect of the change in the grain size of the grinding product on the productivity of the mill is not as pronounced as in the fine grinding process. Table 2 lists the relationship between mill productivity and grain size of the ground product.

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