Improving the Accuracy of Coal Enrichment in Cyclones with Secondary Enrichment

Abstract

The issues of secondary hard coal enrichment in cyclones without grinding of intermediate concentrate were presented. Cyclone separation curves, used in modeling the enrichment process, were discussed. In particular, the effect of improving the shape of the split curves in two- and three-cyclone systems was illustrated, which directly translates into an improvement in the accuracy of the enrichment. In cyclones with a heavy liquid the accuracy of enrichment is nevertheless good enough that the re-enrichment of the intermediate concentrate practically doesn’t make a difference. The value of production is only slightly higher; use of secondary enrichment in systems with heavy media cyclones is not economically profitable. This is not the case with water cyclones. In secondary enrichment systems, a higher value of production with a given quality can be obtained.