Bioprocessing of Mining and Metallurgical Wastes Containing Non-Ferrous and Precious Metals

Abstract:

Mining and metallurgical treatments of sulphide ores are characterised by present significant losses of non-ferrous and precious metals as different types of waste. These elements are accumulated in heaps due to the lack of efficient technology for the recovery of the metals from metallurgical waste. The treatment of two types of industrial metallurgical waste (copper converter slag and old flotation pyrite tailings) containing non-ferrous and precious metals were examined in the laboratory. Leaching of the slag containing 2.74% Cu (as digenite, bornite, and free metal) and 2.49% Zn (as a ferrite ZnFe2O4 and silicate) by an Fe3+-containing solution was studied. The effect of various experimental parameters on the leaching dynamics of copper, zinc, and iron under batch conditions was investigated. The following experimental parameters were recommended: a pH of 1.5, a pulp density of 10% (w/v), a temperature of 70 °C, and an initial Fe3+ concentration of 15 g/L. Leaching under these conditions resulted in the solubilisation of 89.4% copper and 35.3% zinc within 2.5 hours. Percolation leaching of the pyrite tailings containing 0.29% Cu (as chalcopyrite), 0.26% Zn (as sphalerite), 0.00007% gold, and 0.00108% silver was also studied. Acidic percolation leaching and the resulting biooxidation lasting 134 days resulted in the solubilisation of 73.4% zinc and 50.8% copper. The recovery rates of gold and silver from the bioleaching residues by cyanidation were 57.2% and 50.7%, respectively. The data obtained in the present work may be used to estimate the operating parameters for the industrial-scale processing of non-ferrous and precious metals from mining and metallurgical waste.

• Periodical: Advanced Materials Research (Volume 825)
• Pages: 301-304
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.825.301
• Online since: October 2013
• Authors: Aleksandr Bulaev, Maxim I. Muravyov, Tatyana Pivovarova, Natalya V. Fomchenko, Tamara F. Kondrat'eva
• Keywords: Biooxidation, Copper Converter Slag, Ferric Leaching, Pyrite Flotation Tailings, Sulphuric Acid Dissolution

References

[1] B. Gorai, R. Jana, K. Premchand, Characteristics and utilization of copper slag — a review, Resour. Conserv. Recycl. 39 (2003) 299-313.

DOI: 10.1016/s0921-3449(02)00171-4

[2] P.H. -M. Kinnunen, S. Heimala, M. -L. Riekkola-Venhanen, J.A. Puhakka, Chalcopyrite concentrate leaching with biologically produced ferric sulphate, Bioresour. Technol. 97 (2006) 1727-1734.

DOI: 10.1016/j.biortech.2005.07.016

[3] M.I. Muravyov, N.V. Fomchenko, T.F. Kondrat'eva, Biohydrometallurgical technology of copper recovery from a complex copper concentrate, Appl. Biochem. Microbiol. 47 (2011) 607-614.

DOI: 10.1134/s0003683811060093

[4] R. Romero, A. Mazuelos, I. Palencia, F. Carranza, Copper recovery from chalcopyrite concentrates by BRISA process, Hydrometallurgy 70 (2003) 205-215.

DOI: 10.1016/s0304-386x(03)00081-1

[5] F. Carranza, N. Iglesias, A. Mazuelos, R. Romero, O. Forcat, Ferric leaching of copper slag flotation tailings, Miner. Eng. 22 (2009) 107–110.

DOI: 10.1016/j.mineng.2008.04.010

[6] N.A. Filippova, Phazovy analiz rud i produktov ikh pererabotki, Khimiya, Moscow, 1975 (in Russian).

[7] B. Özkaya, E. Sahinkaya, P. Nurmi, A.H. Kaksonen, J.A. Puhakka, Kinetics of iron oxidation by Leptospirillum ferriphilum dominated culture at pH below one, Biotechnol. Bioeng. 97 (2007) 1121–1127.

DOI: 10.1002/bit.21313

[8] J.E. Dutrizac, The physical chemistry of iron precipitation in the zinc industry, in Cigan, J.M., Mackey, T.S., O'Keefe, T.J. (Eds. ), Lead-Zinc-Tin 80, AIME, New York, 1980, p.532–564.