Abstract
A chalcopyrite concentrate containing 17 pct pyrite was oxidized in 1 mol/dm3 sulfuric acid solution at 90 °C (363.2 K). The suspension potential (Ptvs SCE, in the presence of Fe3+/Fe2+) was maintained constant in the range 0.30 to 0.65 V by controlled additions of KMnO4 solution. The oxidation appeared to be under surface reaction control. The rate constant was nearly independent of total Fe concentration (0.01 to 0.5 mol/dm3), but increased rapidly with a rise in suspension potential until it reached a maximum at 0.40 to 0.43 V, after which there was marked decrease at around 0.45 V. Chalcopyrite in the concentrate was oxidized to form elemental sulfur over the whole of the suspension potential range, whereas the oxidation of pyrite took place only above 0.45 V and yielded sulfate ion. At 0.40 V the apparent activation energy was 47 kJ/mol. An analogy between the potential dependence of the rate and the Tafel correlation for an electrode process is discussed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
P. H. Yu, C. K. Hansen, and M. E. Wadsworth:Metall. Trans., 1973, vol. 4, pp. 2137–44.
P.B. Munoz, J. D. Miller, and M. E. Wadsworth:Metall. Trans. B, 1979, vol. 10B, pp. 149–58.
J.E. Dutrizac:Metall. Trans. B, 1981, vol. 12B, pp. 371–78.
L.W. Beckstead, P.B. Munoz, J.L. Sepulveda, J.A. Herbst, J.D. Miller, F. A. Oison, and M. E. Wadsworth:Extractive Metallurgy of Copper, I.C. Yannopoulos and J. C. Agrawal, eds., AIME, 1976, vol. II, pp. 612–32.
F.E. Pawlek:, pp. 690–705.
L.E. Murr and J.B. Hiskey:Metall. Trans. B, 1981, vol. 12B, pp. 255–67.
J.E. Dutrizac:Metall. Trans. B, 1982, vol. 13B, pp. 303–09.
R. S. McMillan, D. J. Mackimmar, and J. E. Dutrizac:J. Appl. Electrochem., 1982, vol. 12, pp. 743–57.
H. Kametani:J. Min. Met. Inst. Japan, 1982, vol. 98, pp. 119–24.
H. Kametani and A. Aoki: Paper presented at the Annual Meeting of Min. Met. Inst. Japan, Tokyo, Japan, April 1984, pp. 362-63.
K. Azuma, S. Goto, H. Kametani, K. Saito, and I. Asakura:J. Min. Met. Inst. Japan, 1969, vol. 85, pp. 795–801.
H. Kametani:J. Min. Met. Inst. Japan, 1983, vol. 99, pp. 117–22.
M. E. Wadsworth:Rate Process of Extractive Metallurgy, H. Y. Sohn and M.E. Wadsworth, eds., Plenum Press, New York, NY, 1976, pp. 141–58.
H. Kametani and M. Kobayashi: Paper presented at the Annual Meeting of Min. Met. Inst. Japan, Tokyo, Japan, April 1982, pp. 275-76.
K. Azuma, H. Kametani, and K. Saito:J. Min. Met. Inst. Japan, 1973, vol. 89, pp. 539–44.
H. Kametani and A. Aoki: Paper presented at the Annual Meeting of Min. Met. Inst. Japan, Tokyo, Japan, April 1981, pp. 121-22.
H. Kametani and M. Kobayashi: Paper presented at the Annual Meeting of Min. Met. Inst. Japan, Tokyo, Japan, April 1982, pp. 277-78.
H. Kametani, Ch. Yamauchi, and A. Aoki:Erzmetall., 1979, Bd. 32, S. 277–85.
Y. Maehashi, Y. Kagaya, and H. Kametani: Paper presented at the Annual Meeting of Min. Met. Inst. Japan, Tokyo, Japan, April 1980, pp. 409-10.
H. Kametani and A. Aoki: Paper presented at the Annual Meeting of Min. Met. Inst. Japan, Tokyo, Japan, April 1982, pp. 279-80.
E. Peters:Metall. Trans. B, 1976, vol. 7B, pp. 505–17.
H. Kametani:J. Min. Met. Inst. Japan, 1983, vol. 99, pp. 207–13.
H. Kametani:Kozan, 1974, no. 10, pp. 34-47.
J. E. Dutrizac, R. J. C. MacDonald, and T. R. Ingraham:Trans. Met. Soc. AIME, 1969, vol. 245, pp. 955–59.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kametani, H., Aoki, A. Effect of suspension potential on the oxidation rate of copper concentrate in a sulfuric acid solution. Metall Trans B 16, 695–705 (1985). https://doi.org/10.1007/BF02667506
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02667506