An advanced physical coal cleaning process
Conference
·
OSTI ID:51986
- China Univ. of Mining and Technology, Beijing (China)
Physical processes for deep-cleaning of coal have been developed, the application of which depends to a large extent upon their economic feasibility; the determinate factors are the cost of ultra-fine grinding to attain necessary liberation of locked mineral from the coal matrix and the cost of reagents consumed to effect separation of micronized coal and mineral particles in aqueous suspension. Modified stirred ball mill has been found to be the promising equipment for ultra-fine coal grinding with both low energy and metal consumption. Selective flocculation-flotation process, as given in the paper presented at the last Conference, is technically feasible for preparation of ultra-clean coal. Recent work has indicated that the reagent consumption can be further reduced to a level proximating that in conventional coal flotation, being more economic feasible for its applications. Ultra-clean coals have been recovered by this process from conventional coal concentrate or low-ash raw coal. It can also be applied to process middling product from a coal preparation plant for additional concentrate extracted at very high yield. For metallurgical coal with difficult washability or high content of middling fractions, the advent of this process will be attractive in both technically and economically.
- OSTI ID:
- 51986
- Report Number(s):
- CONF-940930--
- Country of Publication:
- United States
- Language:
- English
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