Brightening of natural calcitic ores

Details Brightening of natural calcitic ores Brightening of natural calcitic ores

1975-04-11

1976-09-14

Custer, Jr., Granville Y.

Solid material comminution or disintegration

Processes

With application of fluid or lubricant material

241 24, B02C 2318

Patent

active

039802400

ABSTRACT:
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 percent 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 percent 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.

REFERENCES:
patent: 2287440 (1942-06-01), McCleary
patent: 3307790 (1967-03-01), Cohn et al.
patent: 3512722 (1970-05-01), Hall
patent: 3604634 (1971-09-01), Windle
patent: 3627678 (1971-12-01), Marston et al.
patent: 3819515 (1974-06-01), Allen

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