Method of removing pyritic sulphur from coal

Details Method of removing pyritic sulphur from coal Method of removing pyritic sulphur from coal

B - Operations, Transporting

03

D

361/2

B03D 1/02 (2006.01) B03D 1/10 (2006.01)

Patent

CA 1325067

TITLE "A Method of Removing Pyritic Sulphur from Coal" INVENTORS Richard D. Coleman Serge Croteau Charles E. Capes ABSTRACT OF DISCLOSURE Pyritic sulphur is removed from coal by mixing agglomerating oil with a slurry of the coal containing discrete particles of carbonaceous material and pyritic sulphur, and other mineral matter that may be present, the oil being added in an amount less than about 3 wt % of the total solids present in the slurry, and then micro-agglomerating the carbonaceous particles. Pyritic sulphur, while showing a tendency to be hydrophobic, and having an affinity for the agglomerating oil, is weaker in either of these properties than carbonaceous coal, and so by adding a starving amount of agglomerating oil it preferentially agglomerates the carbonaceous particles leaving pyritic sulphur and mineral matter that may be present as discrete particles in the water. Aeration/skimming of the micro-agglomerates is then carried out. The skimmed micro- agglomerates are washed in water in low speed mixers to release weakly clinging pyritic sulphur from them, and then aeration/skimmed from the washing water, newly released pyritic sulphur and any other newly released inorganic substances.

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