Treatment of water-soluble metal sulfate residues
AssigneeAllied Chemical Corporation
InventorsBela I. Karsay, Robert L. Sturtevant
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Abstract
Process for transforming water-soluble metal sulfate residue obtained from spent sulfuric acid containing inorganic impurities, such as pickle liquors or acid wastes from hydrometallurgical processes, into substantially water-insoluble form suitable for disposal which comprises introducing the residue into a pool of molten sulfur maintained at temperature of at least about 250.degree. C. to thereby generate a gaseous stream comprising sulfur dioxide and to transform the metal sulfate residue into corresponding reduction products, and recovering sulfur dioxide and reduction products associated with sulfur in solid form suitable for disposal.
Claims9
Process for transforming solid watersoluble metal sulfate residue obtained from spent sulfuric acid into a substantially water-insoluble agglomerated reduction product, which comprises introducing said metal sulfate residue into a pool of molten sulfur maintained at temperature of at least about 250.degree. C, wherein said pool of molten sulfur furnishes both the reaction medium as well as the reductant for said metal sulfate residue, to thereby generate a gaseous stream comprising sulfur dioxide and to transform the metal sulfate residue into a corresponding reduction product, recovering sulfur dioxide and separating reduction product from the pool of molten sulfur to recover agglomerated reduction product containing sufficient elemental sulfur to bind together the reduction product.
Dependencies are inferred from the claim text.