The theoretically reasonable grinding concentration range is 60% to 83%, but the mineral properties are different. Grinding concentration is different. After determining the grinding concentration, how to keep it within a reasonable range to realize grinding? How about fineness?

In open grinding, grinding concentration is mainly affected by ore bearing performance, ore content and ore bearing water. The grinding fineness is mainly affected by the particle size composition of the original ore, grinding concentration and ball addition system. When changing the properties of the ore, such as increasing the coarse particle size and constant ore supply, the fineness of grinding can be ensured by reducing the ore supply and increasing the grinding concentration. If the fine particle size increases, the amount of ore water must be increased and the amount of ore must be increased to reduce over crushing.

In short, regardless of the grinding size, the grinding concentration can be adjusted by controlling the grinding fineness by adjusting the ore water.

In the case of conventional closed-circuit grinding, the situation will become more complex, mainly increasing the amount of sand return. If the water supply is constant, the amount of ore and sand returned will increase, while the concentration of grinding will increase, and vice versa.

In closed-circuit grinding, the grinding fineness is affected not only by the amount of sand returned, but also by the classification efficiency. If the amount of sand returned is large, the particle size composition of the whole ore will change, the particle size will increase, and the grinding speed will also increase. At this time, the grinding concentration can be appropriately reduced, and the discharge rate can be increased to reduce excessive grinding. If the amount of sand returned is reduced and the ore is coarsened, the ore water can be reduced to increase the grinding concentration.