Method of and apparatus for the dry separation of pyrite...

Details Method of and apparatus for the dry separation of pyrite... Method of and apparatus for the dry separation of pyrite...

B - Operations, Transporting

02

C

196/11, 241/26

B02C 23/10 (2006.01) B03B 9/00 (2006.01) B07B 4/08 (2006.01) B07B 9/00 (2006.01)

Patent

CA 1154417

ABSTRACT OF THE DISCLOSURE A dry method of removing pyrite from mineral coal in which the coal is mill-dried in a milling gas stream and the milled product is subjected to classification to recover a predominantly coal combustible fine fraction and a gravel or coarse fraction containing mining detritus, pyrite and coal. The gravel or coarse fraction is subjected to density separation in whole or in part before being recycled to the milling stage and the density separation separates a light coal fraction from a heavy fraction containing the pyrite and detritus. This light coal fraction can be returned to the milling stage while the heavy coal fraction can be subjected to further separation to recover the pyrite for other use or treatment.

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