The grinding machine is used in combination with a classifier to form a grinding and grading process. Modern beneficiation plant multi-application period or Sec grinding process, rarely used more than three-stage grinding process.

The number of grinding sections is mainly determined by the size of the concentrator, the grindability of the ore, the size of the useful mineral crystal grain, the size of the ore and the particle size of the final product. In general, if the upper limit of the final product particle size is greater than 0.15 mm, a one-stage grinding process can be used; when the final product particle size upper limit is less than 0.15 mm, a two-stage grinding process should be used. Under special circumstances, when the ore size is large (upper limit of 25 mm or more), the ore is difficult to grind and the production scale is large. When the final product particle size is 0.2-0.15 mm thick, the second-stage grinding process can also be considered. If the ore is soft and easy to grind, the production scale is not large. Although the upper limit of the final product size is less than 0.15 mm, a grinding process can also be used.

The number of grinding sections must be determined by technical and economic comparison according to the specific situation.

2. What are the classification tasks? According to what requirements to determine?

In the grinding grading process, according to the different functions of the grading operation, it can be divided into three types: pre-grading, inspection grading and control grading.

Pre-grading: Before the material is fed into the grinding machine, the operation of dividing the qualified fine particles in the raw ore is also called prior classification. When the qualified fraction of the ore in the ore mine exceeds 15%, it is advantageous to use the pre-grading operation.

Inspection classification: The coarse-grained part (unqualified part) in the ore discharge of the grinding machine is separated, and the classification operation returned to the grinding machine for re-grinding is called inspection and classification. This grading operation is most commonly used because it can process a part of the sand returning, which can improve the grinding speed and reduce the over-grinding phenomenon. Therefore, when the qualified ore grade in the ore mine is small, the inspection grading is generally adopted.

Control grading: A job that further stratifies the grading of the grading is referred to as a control grading. This grading operation can only be used when the final product granularity requirements are fine in the field.

3. What are the common types of grinding grading processes in several forms?

A commonly used one-stage grinding grading process is shown in FIG.

Process (a): to just check the grading period of closed-circuit grinding process, it is currently China's non-ferrous metals and ferrous metals concentrator most widely used.

Process (b): It is a section of closed-circuit grinding process that is pre-graded and classified.

Process (c): is a closed-circuit grinding process with controlled grading. This kind of process gives the ore particle size very uneven, reasonable ball loading difficulty, and low grinding efficiency, which is rarely used in general ore dressing plants.

4. What are the common two-stage grinding grading process in several forms?

The common grinding classification process is shown in Figure 11.

Process (a): a two-stage one closed-circuit grinding process. It is suitable for use in concentrators with large feed size and large production scale.

Process (b): It is a two-stage and two closed-circuit grinding grading process. It is commonly used in large and medium-sized concentrators where the final product size is less than 0.15 mm.

Process (c): A grinding and grading process for a two-stage, two-closed road with stage selection. It is suitable for the first stage of grinding products with a considerable amount of useful minerals to achieve monomer separation, which can reduce grinding costs and increase metal recovery.

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