Chemistry: molecular biology and microbiology – Process of utilizing an enzyme or micro-organism to destroy... – Destruction of hazardous or toxic waste
Patent
1983-03-03
1986-02-18
Warden, Robert J.
Chemistry: molecular biology and microbiology
Process of utilizing an enzyme or micro-organism to destroy...
Destruction of hazardous or toxic waste
423 27, 423 28, 423 41, 423DIG17, 75101R, 75115, 75117, B01D 1100, C22B 300
Patent
active
045713871
ABSTRACT:
A process for leaching copper from copper sulphide containing ore, in particular copper from chalcopyrite containing ore, is provided. The ore is preferably initially ground up and mixed with an aqueous acid leaching medium containing sulphide oxidizing bacteria, and a bacterial nutrient, and a catalytic amount of silver. Provision is made in the bacterial nutrient for a source of carbon dioxide and oxygen for the bacteria, both of which may be supplied by means of sparging with carbon dioxide enriched air. A bacterial compatible acid is added initially to the ore and leaching medium mixture and periodically during the process so that sulphide in the copper sulphide is oxidized in stoichiometric amounts to elemental sulphur. During leaching the oxidation potential is maintained between about 0.54 to 0.66 volts, most readily by initial addition of thiosulphate and dissolved copper.
REFERENCES:
patent: 3266889 (1966-08-01), Duncan et al.
patent: 3305353 (1967-02-01), Duncan et al.
patent: 3607235 (1971-09-01), Duncan et al.
patent: 3637371 (1972-01-01), Mackiw et al.
patent: 3856913 (1974-12-01), McElroy et al.
patent: 3886257 (1975-05-01), Snell
patent: 3949051 (1976-04-01), Pawlek
patent: 3974253 (1976-08-01), Snell et al.
patent: 4070182 (1978-01-01), Genik-Sas-Berezowsky
Deepak et al., J. Chem. Tech. Biotechnol., 1981, 31, No. 6, 358-362.
New Oxidative Leaching Process Uses Silver to Enhance Copper Recovery, Engineering and Mining Journal, Oct. (1977) pp. 100-105, Snell et al.
The Influence of Grain Size and Mineralogical Composition on the Leachability of Copper Concentrates, Extractive Metallurgy of Copper, vol. 2 (1976) pp. 691-705, Yannopoulos et al.
Electrochemistry in Silver Catalyst Ferric Sulphate Leaching of Chalcopyrite, Process and Fundamental Considerations of Selected Hydrometallurgical Systems (1981) pp. 327-338, Kuhn.
Behaviour and Effect of Silver on the Leaching of Complex Sulphidic Copper Concentrates, Metal, 36 (1982) pp. 737-739, Gerlach, J.
Bruynesteyn Albert
Hackl Ralph P.
Lawrence Richard W.
Vizsolyi Andrew I.
British Columbia Research Council
Foley Shawn P.
Warden Robert J.
LandOfFree
Biological-acid leach process does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Biological-acid leach process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Biological-acid leach process will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1550961