Method for brightening natural calcitic ores

Details Method for brightening natural calcitic ores Method for brightening natural calcitic ores

1978-01-10

1979-08-28

Goldberg, Howard N.

Solid material comminution or disintegration

Processes

With application of fluid or lubricant material

241 29, B02C 2318

Patent

active

041658400

ABSTRACT:
A method is disclosed for processing a natural calcitic ore to yield a finely divided calcium carbonate particulate of very high brightness characteristics. The natural calcitic ore is initially coarse-milled to produce a product wherein no more than 5% by weight of the particulate is +325 mesh, and no more than 35% by weight of the particles are of less than 2 microns E.S.D. This coarse-milled product is then subjected as an aqueous slurry including less than 40% solids, to a froth flotation, which separates with the froth the relatively coarse colorbodies liberated in the initial grinding. The purified underflow is then dewatered to at least 60% solids by weight, and is wet-milled, as for example in a sand mill, to yield an output product wherein at least 80% by weight of the resultant particulate has an E.S.D. of less than 2 microns, the product being further characterized by a brightness of at least 94 on the G.E. scale.

REFERENCES:
patent: 3307790 (1967-03-01), Cohn et al.
patent: 3512722 (1970-05-01), Hall
patent: 3604634 (1971-09-01), Windle
patent: 3980240 (1976-09-01), Nott
patent: 3989195 (1976-11-01), Steward

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