The main factors affecting the efficiency of grinding technology are summarized as follows.

(1) Influence of ore properties The composition and physical properties of ore have a great influence on the efficiency of grinding technology. For example, when the useful minerals in the ore are coarse in size and loose in structure, they are easier to grind. When the useful mineral has a finer grain size, a dense structure, and a higher hardness, it is more difficult to grind. In general, the coarse-grained grade is easier in rough grinding, the faster it produces the acceptable particle size, and the finer the grinding. Because as the particle size decreases, the fragile surface of the material also decreases, that is, becomes more and more sturdy, so the rate of producing the qualified particle size is slower. Therefore, the coarse grinding technology is more efficient than fine grinding.

(2) Influence of equipment factors Equipment factors have a certain impact on the efficiency of grinding technology. For example, the overflow ball mill has a slower discharge rate, and the large density of the ore is not easily discharged, and it is easy to cause excessive pulverization. In addition, the classifier that forms a closed circuit with the grinding machine is easy to pulverize when the classification efficiency is low, thus reducing the efficiency of the grinding technology.

(3) Influence of operational factors Operational factors undoubtedly affect the efficiency of grinding technology. For example, in closed-circuit grinding, when the ratio of returning sand is too large and exceeds the normal passing ability of the grinding machine, the phenomenon of “running rough” will appear in the grinding products. If the sand return ratio is too small or there is no sand return, it will easily cause over-grinding. If the load is too large, the phenomenon of “running rough” in the grinding products is serious, and if the load is insufficient, the crushing is severe. Therefore, it is required to give uniformity and stability to the ore during sanding. When the ore amount is given, the efficiency of the grinding technology will be improved.

The grinding grain size of each section is determined unreasonably, which also affects the efficiency of grinding technology.

Grinding concentration has a great influence on the efficiency of grinding technology. Because the grinding concentration directly affects the grinding time, the concentration is too large, the material flows slowly in the mill, the grinding time increases, and it is easy to over-crush. In addition, in the high concentration of the slurry, the coarse particles are not easy to sink, and it is easy to flow away with the slurry, resulting in "running rough". If the concentration of the slurry is too thin, the material flow rate will increase. When the grinding time is shortened, "running coarse" will also occur, and at the same time, large-density ore particles are easily deposited on the bottom layer of the slurry, which may cause over-grinding. Therefore, proper grinding concentration should be mastered during operation, which requires strict control of water consumption. Generally, the coarse grinding concentration is usually from 75% to 85%, and the fine grinding concentration is generally from 65% to 75%.

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