Treatment of chromium ore residues to suppress pollution
AssigneeAllied Chemical Corporation
InventorsAlan Brian Gancy, Christian Albert Wamser
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Abstract
Method for treating solid ore residue obtained by production of chromium chemicals from chromite ore, to reduce leaching of chromium compounds therefrom after disposal, which involves reducing the particle size of the residue prior to disposal so that at least about 20 percent by weight of the residue passes through a 200 mesh (U.S.) screen.
Claims10
The method for reducing bleeding of water-soluble chromium compounds from the solid residue obtained in the production of chromates from chromite ore by roasting the ore under alkaline oxidizing conditions to form water-soluble chromate, followed by extraction of the chromate, which comprises reducing the particle size of the solid residue prior to disposal so that at least about 20 percent by weight of the residue, dry basis, passes through a 200 mesh (U.S.) screen.
Dependencies are inferred from the claim text.