There are many factors affecting the production efficiency of the ball mill, but they can be summarized as follows:

1. Material properties

The grindability factor was discussed in the previous section. It can be seen that the grindability coefficient is related to the mechanical strength, inlay characteristics and grinding ratio of the ore. The harder the ore is, the smaller the grindability, the more energy it consumes to grind it, and the lower the processing capacity of the ball mill. In addition, the properties of various minerals in the ore are also different, which are easy to grind and hard to grind, so there will be the phenomenon of selective grinding, that is, one part has not been milled yet, but the other part has been crushed. For the tungsten tin ore that is afraid of being crushed, especially, it should be noted that the milled out should be separated in time. The finer the ore, the more difficult it is to grind, and the grindability coefficient will change with the increase of grinding ratio. The grindability of mineral aggregate can not be changed generally, but the research results in recent years show that in some special cases, the grindability of ores can be significantly changed by preheating treatment, electric heating irradiation or the use of surfactant. Some of them have been used in production practice, which not only reduces the number of grinding and magnetic separation sections, but also improves the concentrate index.

2. Feeding granularity

The coarser the ore is fed to the ball mill, the longer the grinding time is required, the more work is required to grind it to the specified fineness, and the smaller the productivity is. The influence of feed particle size on ball mill productivity is related to ore properties and product fineness. Therefore, when it is required to increase the production capacity of the ball mill, in a certain range, reducing the size of ore feed has a significant role.

3. Product fineness

The particle size of grinding products of ball mill directly affects the separation index. Grinding products are too coarse, useful minerals and gangue are not fully disintegrated, too fine and cause serious over comminution, both of which will reduce the separation index. For example, when the grinding particle size is changed to finer, the energy consumption and steel consumption increase, the productivity decreases, and the cost of grinding one ton of ore is higher than that of coarse grinding. Therefore, the determination of grinding particle size must be based on the comprehensive examination of technical and economic conditions.

2、 Structure and speed of ball mill

1. Mill type 2. Mill diameter and length 3. Mill speed 4. Liner type

The productivity of smooth liner used in ball mill is usually smaller than that of non smooth liner mill. If too thick liner is used, the effective volume of the ball mill will be reduced and the productivity will be reduced. After the lining plate is worn, the inner diameter of the mill will increase. At this time, the ball loading rate of the steel ball will appear low, which will reduce the productivity. Therefore, the ball loading amount should be increased appropriately.

3、 Operating conditions

Factors in this regard include ball loading system, grinding concentration and feeding speed.