Silver-catalyzed bioleaching for raw low-grade copper sulphide ores

Abstract

This research was conducted to investigate the biooxidation and copper dissolution from raw low-grade refractory copper sulphide ores located in the Xinjiang Autonomous Region of China using adapted Thiobacillus ferrooxidans bacteria. In order to accelerate the bioleaching rate, the adapted mixed bacteria and silver ion catalyst were tested in the leach columns at laboratory scale. The overall acid consumption was 4.3 kg sulphuric acid per kg of dissolved copper and was linearly related to the percent copper dissolution. The calculated copper dissolution rates obey the Shrinking Core Model. The relative activation energy of the whole biooxidative leaching stages was calculated to be 48.58 kJ/mol.

Keywords

green process / biohydrometallurgy / bioleaching / reaction kinetics / sulphide ores

References

[1] Hearne T M, Haegele R, Beck R D. Zinc and Lead Processing. In: Dutrizac J E, Gonzalez J A, Bolton G L, Hancock P, eds. The metallurgical Society of CIM, 1998: 765-780

[2] Poulin R, Lawrence R W. Economic and environmental nicks of biohydrometallurgy. Miner Eng, 1996, 9(8): 799-810

[3] Deng T L, Liao M X, Wang M H, Chen Y W, Belzile N. Investigations of accelerating parameters for the biooxidation of low-grade refractory gold ores. Miner Eng, 2000, 13(14-15): 1543-1553

[4] Watling H R. The bioleaching of sulphide minerals with emphasis on copper sulphides: A review. Hydrometallurgy, 2006, 84(1-2): 81-108

[5] Schrenk M O, Edwards K J, Goodman R M, Hamers R J, Banfield J F. Distribution of T. ferrooxidans and L. ferrooxidans: Implications for generation of acid mine drainage. Science, 1988, 279(6): 1519-1522

[6] Gehrke T, Telegdi J, Thierry D. Importance of intracellular polymeric substances from T. ferrooxidans for bioleaching. Appl Environ Microbiol, 1998, 64(7): 2743-2747

[7] Mazuelos A, Carranza F, Palencia I, Romero R. High efficiency reactor for the biooxidation of ferrous iron. Hydrometallurgy, 2000, 58: 269-275

[8] Akcil A, Ciftci H, Deveci H. Role and contribution of pure and mixed cultures of mesophiles in bioleaching of a pyritic chalcopyrite concentrate. Miner Eng, 2007, 20(3): 310-318

[9] Liao M X, Deng T L. Zinc and lead extraction from complex raw sulfides by sequential bioleaching and acidic brine leach. Miner Eng, 2004, 17(1): 17-22

[10] Ubaldini S, Veglio F, Toro L, Abbruzzese C. Biooxidation of arsenopyrite to improve gold cyanidation: Study of some parameters and comparison with grinding. Int J Miner Process, 1997, 52: 65-80

[11] Ballester A, González F, Blázquez M L, Cómez C, Mier J L. The use of catalytic ions in bioleaching. Hydrometallurgy, 1992, 29: 145-160

[12] Sato H, Nakazawa H, Kudo Y. Effect of silver chloride on the bioleaching of chal-copyrite concentrate. Int J Miner Process, 2000, 59: 17-24

[13] Muñoz J A, Dreisinger D B, Cooper W C, Young S K. Silver-catalyzed bioleaching of low-grade copper ores. Part I: Shake flasks tests. Hydrometallurgy, 2007, 88(1-4): 3-18

[14] Muñoz J A, Dreisinger D B, Cooper W C, Young S K. Silver-catalyzed bioleaching of low-grade copper ores. Part II: Stirred tank tests. Hydrometallurgy, 2007, 88(1-4): 19-34

[15] Mier J L, Ballester A, Blázquez M L, González F, Muñoz J A. Influence of metallic ions in the bioleaching of chalcopyrite by Sulfolobus BC: Experiments using pneumatically stirred reactors and massive samples. Miner Eng, 1995, 8(9): 949-965

[16] Chaudhury G R, Das R P. Bacterial leaching-complex sulphides of copper, lead and zinc. Int J Miner Process, 1987, 21: 57-64

[17] Fowler T A, Crundwell F K. Leaching of zinc sulphide by Thiobacillus ferrooxidans: Bacterial oxidation of the sulfur product layer increases the rate of zinc sulphide dissolution at high concentrations of ferrous ions. Appl Environ Microbiol, 1999, 65(12): 5285-5292

[18] Habashi F. Principle of Extractive Metallurgy, Vol 1. New York: Gordon & Breach, 1979, 130-164

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Higher Education Press and Springer-Verlag Berlin Heidelberg