Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1992-06-18
1993-10-05
Lewis, Michael
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
423 29, C01G 500, C01G 700
Patent
active
052502724
ABSTRACT:
A process for leaching gold and silver from ores and ore concentrates is disclosed using a cyanide leaching solution and hydrogen peroxide and maintaining an oxygen concentration of 2 to 20 Mg of O.sub.2 /liter. In the invention, leaching takes place in the presence of decomposition catalysts and preferably the formed cyano-complexes are separated during leaching from the leach solution. Decomposition catalysts are manganese compounds, present as 0.01 to 1 mg computed as Mn/liter of barren solution, or 1 to 50 mg computed as Mn per kg of ore slurry, or they are inorganic or organic polymers or carbon. Activated charcoal is preferred and simultaneously adsorbing cyano-complexes of precious metals. The process offers lowered consumption of H.sub.2 O.sub.2 and possibly cyanide and maximum gold yield in a shortened leaching time.
REFERENCES:
patent: 732605 (1903-06-01), Thede
patent: 2839387 (1958-06-01), Burton et al.
patent: 3826723 (1974-07-01), Woods et al.
patent: 4578163 (1986-03-01), Kunter et al.
patent: 4745953 (1988-07-01), Brison et al.
patent: 4816234 (1989-03-01), Brison et al.
patent: 4971625 (1990-11-01), Bahr
SME-AIME, Annual Meeting, Atlanta, Ga., Mar. 6-10, 1983, "The Use of Peroxygen Chemicals in the Heap Leaching of Gold and Silver Ores".
European Search Report in EP 89115067, EP 0358004, 1990.
Dorr, J. V. N., et al., "Cyanidation and Concentration of Gold and Silver Ores" 1950, Second Edition, pp. 216-218.
Woodcock, J. T., et al., "Oxygen concentrations, redox potentials, xanthate residuals, and other parameters in flotation plant pulps", in Mineral processing and extractive metallurgy: Proceedings of the Ninth Commonwealth Mining and Metallurgical Congress 1969, vol. 3, 1970, pp. 439-468.
Jones, M. H., et al., "Evaluation of ion-selective electrode for control of sodium sulphide additions during laboratory floation of oxidized ores", pp. C99-C105, published Jun. 1978.
Peck, R. C., thesis entitled "Peroxide in the cyanide leaching of gold and silver ores" submitted in fulfilment of the requirements for the degree of Doctor of Philosophy at the University of Leeds, Department of Mining and Mineral Engineering, Dec. 1980.
Julian, H. F., et al., Cyaniding Gold and Silver Ores: A Practical Treatise on the Cyanide Process, 1904 pp. 73-76.
Jones, M. H., et al., "Perxanthates-A New Factor in the Theory and Practice of Flotation", International J. of Mineral Processing (1978), vol. 5, pp. 285-296.
Fraser, G. M., "Aeration Design for Gold Ore Leaching", pp. 245-256, presented at the Australlasian Institute of Mining and Metallurgy, Perth and Kalgoorlie Branches Regional Conference on "Gold-Mining, Metallurgy and Geology", Oct. 1984.
Haigh, C. J., et al., "Residue Treatment Plant Practice at Risdon, Tasmania", pp. 339-349, presented at the Australlasian Institute of Mining and Metallurgy Conference, Tasmania, May 1977.
Day, E. L., "Some factors influencing the rate of dissolution of gold in sodium cyanide solutions", Canadian Mining Journal (Aug. 1967), pp. 55-60.
Cathro, K. J., "The Effect of Oxygen in the Cyanide Process for Gold Recovery", pp. 181-205, Div. of Mineral Chem., Commonwealth Scientific and Ind. Res. Org., May, 1963.
Fahrenwald, A. W., et al., "Some Studies on the Gold-Dissolution Rate in Cyanide Solutions", Engineering and Mining Journal, vol. 140, pp. 44-46, Jan. 1949.
Mining Engineering (May 1983), pp. 517-519, vol. 35 (5).
Garcia, R. M., "The recovery of silver from photographic film: A study of the leaching reaction with cyanide solution for industrial use", Hydrometallurgy (1986), vol. 16, pp. 395-400.
Gos Steven
Knorre Helmut
Loroesch Juergen
Stoll Mathias
Ziegler Annette
Bos Steven
Degussa - Aktiengesellschaft
Lewis Michael
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