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Journal of the Southern African Institute of Mining and Metallurgy

On-line version ISSN 2411-9717
Print version ISSN 0038-223X

J. S. Afr. Inst. Min. Metall. vol.110 n.11 Johannesburg Nov. 2010




Processing strategy for different coal types



I. du Plessis





The metallurgical response of a difficult to treat coal and an easy to treat coal orebody were investigated in terms of the coal yield and the coal quality in a basic coal recovery flowsheet. The purpose of this paper is to show trends and derive principles for the treatment of different coal types. This investigation entailed using the LIMN simulator to simulate the metallurgical response by varying the plant operational parameters. The controllable plant variables investigated were:
Cyclone size
Screen and hydrocyclone cut points
Medium cut density
Feed particle size distribution. The following general principles can be derived from the work:
Crushing finer can significantly improve the overall metallurgical performance, especially for a difficult to treat ore
The strategy of crushing finer works better when there is a flotation stage in the circuit as it minimizes losses to fine discard
Smaller cyclones result in slightly better performance because of the greater centrifugal force generated giving a smaller breakaway size.

Keywords: Coal yield, coal quality, LIMN, coal types, processing strategy, liberation



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