Brightening of natural dolomitic ores
AssigneeAnglo-American Clays Corporation
InventorAlan J. Nott
Life of this patent
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Abstract
A method for brightening a natural dolomitic 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% 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% of the particles are less than 2 microns, E.S.D. thereby liberating substantial quantities of the discoloring contaminants. The liberated impurities are thereupon separated by subjecting the slurry to a high intensity magnetic field.
Claims8
A method for brightening and purifying a natural dolomitic ore by removing discoloring contaminants therefrom, comprising the steps of:
- crushing said ore;
- forming said crushed ore into an aqueous slurry, and coarse-milling said slurry to produce a coarse-milled product;
- liberating substantial quantities of said discoloring contaminants by subjecting said coarse-milled product to a further wet-milling step to alter the particulate such that at least 70% of the particles are less than 2 microns;
- and
- separating the liberated contaminants from said further milled slurry, by subjecting said slurry to a wet magnetic separation in a high intensity magnetic field.
Dependencies are inferred from the claim text.