Enhanced leaching of minerals which form product layers

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound

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423 27, 423 32, 423109, 4236585, 75101R, 75103, 75104, C01G 100, C22B 300

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043437737

ABSTRACT:
A novel process for enhancing the leaching rate of a mineral wherein the mineral is characterized by the tendency to form a reaction product layer during leaching. A suitable particulate modifier such as carbon is mixed with the mineral prior to leaching and selectively alters the characteristics of the reaction product layer. The process is particularly useful for leaching chalcopyrite, sphalerite and galena.

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patent: 3886257 (1975-05-01), Snell
patent: 4115221 (1978-09-01), Wadsworth
patent: 4256485 (1981-03-01), Richardson
Beckstead et al. in Extractive Metallurgy of Copper, vol. II, AIME, N.Y. (1976) pp. 611-632.
Munoz et al. in Metallurgical Transactions (10B) (1979) pp. 149-158.
Miller et al. in Process and Fundamental Aspects of Selected Hydrometallurgical Systems, SME/AIME (1981).
Beckstead et al. in Fundamental Aspects of Hydrometallurgical Processes, AICHE Symp. Series (1978) pp. 28-40.
Wegner in J. Physical Chemistry Solids, (1972) pp. 1051-1059.
Mun et al. Metallurgical Applications of Bacterial Leaching and Related Microbiological Phenomena, Academic Press, N.Y. (1978) pp. 144, 145.

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