Back to results
US 4,055,485 AGranted
Method for improving clay brightness utilizing magnetic separation
AssigneeAnglo-American Clays Corporation
InventorAlan J. Nott
Life of this patent
Estimating the term…
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.
Claims10
A method for brightening a kaolin clay comprising:
- forming an aqueous dispersion of said clay and blunging and conditioning said dispersion to dissipate at least 10 hp/hrs of energy per ton of solids, at least said conditioning step being conducted in the presence of a fatty acid collector agent;
- subjecting the resultant blunged and conditioned slurry to a froth flotation treatment to remove titaniferrous impurities;
- and
- subjecting the product from said froth flotation treatment to a wet magnetic separation to further increase the brightness of said clay by removal of discoloring contaminants in addition to said titaniferrous 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 kg.
1 more element
Dependencies are inferred from the claim text.