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Guideline for Upgrading of A Low Grade Coal by “NP & P Separation” Technique

Siwarote Siriluck



High grade coal is excavated for utilization while a low grade coal have gangue impurities , waiting for an upgrading
technique to be used in the future. Nowadays, an upgrading technique for coal uses many methods e.g. jig concentrator, hydro cyclone, shaking table, spiral classifier, dense medium separator or froth flotation. This article to suggest that “NP&P
SEPARATION” technique developed and tested in a laboratory scale which can separate coal from sand impurities by utilizing of used lubricating oil to increase the high heating value of coal, to use pump system in the coal. The separated coal can be transported by pump, however, coal particles are not wet by water. This technique is also expected to be applied in the separation of oil shale (with kerosene coating) from ordinary shale. However, industrial applications of the technique still need to be proved.


NP&P SEPARATION, Upgrading coal, Upgrading oil shale, Mineral processing

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