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US 3,974,067 AGranted
Method for improving clay brightness utilizing magnetic separation
AssigneeAnglo-American Clays Corporation
InventorAlan J. Nott
Life of this patent
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Abstract
A method for brightening a kaolin clay wherein an aqueous dispersion is initially formed of said clay, which dispersion is blunged and conditioned and the resultant slurry thereupon subjected to a froth flotation treatment to remove titaniferous impurities. The purified product from the froth flotation treatment is thereupon subjected to magnetic separation by passing such product through a slurry-pervious ferromagnetic matrix positioned in a high intensity magnetic field, which results in substantial, additional brightening of the clay.
Claims12
A method for brightening a kaolin clay, comprising:
- forming an aqueous dispersion of said clay, and blunging and conditioning said dispersion as to dissipate at least 10 h.p.-hrs. of energy per ton of solids, at least said conditioning step being conducted in the presence of oleic acid as a collecting agent;
- subjecting the resultant blunged and conditioned slurry to a froth flotation treatment to remove titaniferous impurities;
- and
- subjecting the product from said froth flotation treatment to a wet magnetic separation to further increase the brightness of said clay be removal of discoloring contaminants in addition to said titaniferous impurities, by passing said product through a slurry-pervious ferromagnetic matrix positioned in a high intensity magnetic field, the retention time in said field being at least 15 seconds, and the said field being maintained at an average field intensity of from 7 to 22 kilogauss.
1 more element
Dependencies are inferred from the claim text.