Brightening of natural calcitic ores

Details Brightening of natural calcitic ores Brightening of natural calcitic ores

C - Chemistry, Metallurgy

09

C

6/194

C09C 1/00 (2006.01) C01F 11/18 (2006.01) C09C 1/02 (2006.01)

Patent

CA 1061957

ABSTRACT OF THE DISCLOSURE A method for brightening a natural calcitic ore by removal of discoloring contaminants. The ore is crushed and formed into an aqueous slurry, which slurry is then coarse- milled to produce a product wherein no more than 1% of the particulate matter is +325 mesh. This coarse-milled product is then subjected to a further, wet-milling step, to alter the particulate such that at least 70% of the particles are less than 2 microns, thereby liberating substantial quantities of the discoloring contaminants. The liberated impurities are thereupon separated from the slurry by flotation and/or by subjecting the slurry to a high intensity magnetic field.

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