Acid Production from Mixed Sulfide Minerals: The Mixture Pyrite/Arsenopyrite

C.M.V.B. Almeida, B.F. Giannetti*

Received 10 September 2002; accepted 23 July 2003

 

Abstract

To evaluate the response of pyrite and arsenopyrite to oxidizing conditions, an electrochemical approach was employed, to set boundaries for the influence of the arsenopyrite content. The effects of galvanic interactions and local pH on the oxidation reaction of pyrite were also studied. With this purpose, artificial two-mineral electrodes were constructed ranging in concentration from 20-80 % arsenopyrite. The resulting cyclic voltammograms were analyzed and relative quantities of oxidation products were evaluated.

Keywords: sulfide mixtures, pyrite, arsenopyrite, oxidation.

 

Texto completo disponível apenas em PDF.

Full text only in PDF format.

 

References

1. I.C. Hamilton, R . Woods, J. Electroanal. Chem . 118 (1981) 327.        [ Links ]

2. B.F. Giannetti, S.H. Bonilla, C.F.Zinola , T. Rabóczkay, Hydrometallurgy 60 (2001) 41.        [ Links ]

3. H.K. Lin, Z.M. Zheng, Hydrometallurgy 42 (1996) 411.        [ Links ]

4. M.J.V. Beattie, G.W. Poling, Int. J. Miner. Process. 20 (1987) 87.        [ Links ]

5. V. Sanchez, J.B. Hiskey, Met. Trans. B. 19 (1988) 943.        [ Links ]

6. P.G. Fernandez, H.G. Linge, M.W. Wadsley, J. Appl. Electrochem. 26 (1996) 575.        [ Links ]

7. P.G. Fernandez, H.G. Linge, M.W. Wadsley, J. Appl. Electrochem. 26 (1996) 585.        [ Links ]

8. M.J.A. Vreugde, Ph.D. Thesis, University of British Columbia Canada, 1982.        [ Links ]

9. B.W. Vink, Chemical Geology 130 (1996) 21.        [ Links ]

10. A. Vogel, “Química Analílica Qualitativa”, Ed. Kapeluz, Buenos Aires, 1983.        [ Links ]

11. K.K. Mishra, K. Osseo-Asare, J. Electrochem. Soc. 135 (1988) 2502.        [ Links ]

12. J.D. Dana, “Manual de Mineralogia”, Livros Técnicos e Científicos Editora, São Paulo, 1970.        [ Links ]

13. P.R. Holmes, F.K. Crundwell, Hydrometallurgy 39 (1995) 353.        [ Links ]

 

*Corresponding author. E-mail address: biafgian@unip.br