Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1979-10-11
1981-03-17
Lewis, Michael L.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
44 1SR, 75101R, 75115, 75118R, 201 17, 423 41, 423 87, 423 95, 423 98, 423106, 423109, 423146, 423150, 423544, 423558, 423563, 423564, 435168, 435262, 435942, C22B 111
Patent
active
042564859
ABSTRACT:
A process for treating sulfide ores to reduce the sulfur content or recover the metal content therefrom comprises the use of enzymatic action to solubilize the sulfur and metal content.
A nutrient, such as a saccharide, is used along with yeast spores which feed on the sugar and produce enzymes which act on sulfur in the sulfide ore to cause the sulfur to go into solution and to dissolve those metals which are soluble in strongly acidic solution. Sulfuric acid can be formed from the sulfide ores or from free sulfur by reaction with water, with evolution of hydrogen sulfide gas. Oxidation of at least a portion of the hydrogen sulfide can be achieved to regenerate sulfuric acid.
REFERENCES:
patent: 2521761 (1950-09-01), Strawinski
patent: 3268414 (1966-08-01), Laine
patent: 3455679 (1969-07-01), Mayling
patent: 3826308 (1974-07-01), Whitney
patent: 3959436 (1976-05-01), Watts
Chemical Abstracts No. 131,983u, vol. 75, p. 137, (1971).
Solozhenkin, P. M.; Preprint Int. Conf. Chem. Metall. Paper 37 Bhabha At. Res. Cent; Bombay India (1979).
Detz, C. M.; et al; "Microbrial Desulphurization of Coal", Mining Congress Journal, Jul. 1979, pp. 75-86.
Chemistry Of Coal Utilization vol. I, John Wiley & Sons, Inc., pp. 428-430.
Hadih's Chemical Dictionary, McGraw Hill, pp. 132, 592, 644.
Jacobson Harvey B.
Lewis Michael L.
Northwest Ecological Research & Development, Inc.
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