What are the common crushing processes in the concentrator?

Beneficiation plant the more common two and three-stage crushing process crushing process. The two-stage crushing process is further divided into two open circuits [Fig. 2-1(a)] and two closed circuits [Fig. 2-1(b)]. The latter section of the crusher and the inspection screen are divided into closed circuits, which ensures that the product size meets the requirements and does not affect the next grinding operation. The second-stage process is only suitable for small mines with underground mining methods. The total crushing ratio is not large, generally around 15~25, and the amount of broken ore is not much, often less than 1000 tons/day.

The two-stage open-circuit process is rarely used, except that in some re-election plants, the two-stage open-circuit process is used to deliver the broken products to the rod mill or to the outside. Most of the concentrating plants use a two-stage closed-circuit process.

The three-stage crushing process also has three open sections [Fig. 2-1(c)] and three sections and one closed circuit [Fig. 2-1(d)]. The three sections in Figure 2-1 are pre-screened before they are broken, but they may not be pre-screened in the first or second stage. The three-stage open circuit is mainly because the particle size requirements of the final product cannot be guaranteed and are rarely used. The three-stage and one-closed process is divided into closed circuits by the inspection screen in the third stage. This is the most common process. Applicable to large, medium and small concentrators, its total crushing ratio is also large, up to 25 ~ 200, the maximum ore size can reach about 1000 mm, the size of crushed products can reach 12 mm or less.

In a few cases, when the size of the concentrator is large and the original ore size is also large, in order to reduce the crush ratio of each section or to obtain a finer product size, a four-stage crushing process can also be used.

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