How does particle size affect a centrifugal concentrator?

Today I’d like to discuss how mineral particle size affects a centrifugal performance. Centrifugal separation particle size is determined by the degree of dissociation of useful minerals and gangue.

Although a centrifugal concentrator beneficiation does not require complete monomer dissociation, it also requires partial dissociation of minerals and gangue to achieve a certain specific gravity difference. otherwise, it will cause competitive settlement between gangue and minerals, and the separation effect is not ideal. Under the recovery rate and taste, we need to try our best to control the particle size within the range of mineral monomer dissociation. Mineral particles with varying sizes will affect our centrifuge’s beneficiation effect to varying degrees.

 

As can be seen from the following two groups of test results, particle size clearly impacts a centrifugal concentrator beneficiation.

The lead ore of a project is selected. Under the same conditions, the first group of full particle feeding, the lead with the separation grade of 1.11% by centrifuge can be enriched to 5.45%, the enrichment ratio can reach 4.91 times, and the recovery rate is 37.85%

The second group is divided into two sections by 100 mesh sieve. The first section is fed with 100 mesh. The conditions are the same. The lead with the grade of 1.09% can be enriched to 2.87%, the enrichment ratio can reach 2.63 times, and the recovery rate is 18.83%. The second stage – 100 mesh feeding under the same conditions. The lead with the separation grade of 1.42% in the centrifuge can be enriched to 8.35%, the enrichment ratio can reach 5.88 times, and the recovery rate is 50.10%. According to the comparison of the two groups of test data, it can be seen that the dissociation of ore on the upper stage of the centrifuge with 100 mesh is not good, and the separation effect is not ideal; however, the dissociation effect of the lower stage with 100 mesh is sufficient, and the beneficiation index is excellent.

Thus, particle size does not seem to have a significant effect on a centrifugal beneficiation. Using the particle size test, the best beneficiation particle size of the ore is determined on the centrifuge.

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