Vertical Coal Mill

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Factors affecting the efficiency of Vertical Coal Mills

First. Material properties, ore size and product fineness

1, material properties

The grindability coefficient is mentioned in the previous section. It can be seen that the grindability coefficient is related to the mechanical strength of the ore, the embedding characteristics and the grinding ratio. The harder the ore is, the smaller the grindability is, the more energy it consumes, and the lower the processing capacity of the Vertical Coal Mill. In addition, the properties of the minerals in the ore are also different, easy to grind and difficult to grind, so there will be a choice of grinding, that is, a part has not been ground, but another part has been crushed, for fear of over-grinding tungsten Tin mines, in particular, should be carefully removed in time. The finer the ore is, the harder it is to grind. As the grinding ratio increases, the grindability coefficient also changes. The grindability of mineral materials is generally unchangeable, but recent research has shown that in some special cases, pre-heat treatment, electrothermal irradiation or the use of surfactants can be used to significantly change their ore. The performance of being grounded, and some have been applied to production practice, not only reduced the number of grinding and magnetic separation, but also improved the concentrate index.

2, the size of the ore

The thicker the Vertical Coal Mill feeds, because of the longer grinding time required, it will grind it to the specified fineness and the productivity will be small. The effect of changes in the grain size of the ore on the productivity of the Vertical Coal Mill is related to the nature of the ore and the fineness of the product. Therefore, when it is required to increase the productivity of the Vertical Coal Mill, it is important to reduce the grain size of the ore within a certain range.

3, product fineness

The particle size of the Vertical Coal Mill grinding products directly affects the selection index. The size of the grinding products is too coarse, the useful minerals and gangues are not fully dissociated, and too fine and cause more serious over-grinding. Both cases will lower the selection index. If the grinding particle size is changed to finer, the energy consumption and steel consumption increase, and the productivity decreases. The cost per grit of ore is higher than when the grinding is coarse. Therefore, the determination of the grinding particle size must be comprehensively tested according to technical and economic conditions.

Second, the structure and speed of the Vertical Coal Mill

1. Type of Vertical Coal Mill 2. Diameter and length of Vertical Coal Mill 3. Rotating speed of grinding machine 4, type of liner

The productivity of a smooth lining for a Vertical Coal Mill is often smaller than that of a non-smooth lining Vertical Coal Mill. The use of an overly thick liner will reduce the effective volume of the Vertical Coal Mill and reduce productivity. After the liner is worn, the inner diameter of the Vertical Coal Mill will increase. At this time, the loading rate of the steel ball will appear to be low, which will reduce the productivity, and the ball loading amount should be appropriately increased.

Third, the operating conditions

The factors in this regard include the ball loading system, the grinding concentration and the feeding speed.

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