Treatment of water-soluble metal sulfate residues

Details Treatment of water-soluble metal sulfate residues Treatment of water-soluble metal sulfate residues

1975-11-20

1977-08-23

Vertiz, O. R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

423274, 423531, 423541A, 423543, 423DIG3, C04B 3304, C01B 1750, C01B 1772, C01B 1790

Patent

active

040438228

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.

REFERENCES:
patent: 238980 (1881-03-01), Spence
patent: 455611 (1891-07-01), Emanuel
patent: 463143 (1891-11-01), Emanuel
patent: 3383170 (1968-05-01), Furkert et al.
patent: 3427126 (1969-02-01), Cambi
patent: 3450523 (1969-06-01), Socolesu
patent: 3667908 (1972-06-01), Torrence
patent: 3810968 (1974-05-01), Renault et al.
patent: 3833715 (1974-09-01), Deschamps et al.
Nair et al., Reduction of Sulfate by Sulfur in a Vacuum, Current Science, vol. 39, No. 14, July 1970, p. 322.
Beck et al., Alien Property Custodian Serial No. 393,258, July 13, 1943.

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