C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
241/140
C01F 11/18 (2006.01) B03D 1/001 (2006.01) C09C 1/02 (2006.01) C09C 3/00 (2006.01)
Patent
CA 1119142
SK-440/497 METHOD FOR BRIGHTENING NATURAL CALCITIC ORES Abstract of Disclosure 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 containing less than 40% and preferably less than 30% solids by weight, to a froth flotation, which separates with the froth the relatively coarse colorbodies liberated in the initial grinding. Preferable compositions for use in the froth flotation comprise the salt derivatives of 1-hydroxy-ethyl-2-alkyl- imidazolines, with such compounds being utilized in admixture with a neutral aliphatic hydrocarbon. The purified underflow from the flotation step is 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.
319423
Lewis Herbert I.
Mcconnell Anthony D.
Price William M.
Anglo-American Clays Corporation
Ridout & Maybee Llp
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