versão On-line ISSN 2411-9717
J. S. Afr. Inst. Min. Metall. vol.108 no.5 Johannesburg Mai. 2008
Development of a viable process for the recovery of zinc from oxide ores
J.R. de Wet; J.D. Singleton
Green Team International (Pty) Ltd
The Skorpion Zinc Project demonstrated the viability of the production of zinc from non-sulphide (commonly called 'zincoxide') ores, using the leach/solvent extraction/electrowinning process route. The success of Skorpion raised the profile of a number of other zinc oxide deposits, considered to be similar. However, a study of three such deposits demonstrates that the application of whole-ore-leaching may be limited and that the concentration of zinc, or at least the separation from acidconsuming gangue minerals, prior to leaching is essential to the successful recovery of zinc from these deposits. The recovery of zinc is dependent on an understanding of the geology of the deposit, the mineralogical association of zinc minerals with gangue minerals (Boni, 2005) and limitations of mining practice.
Flowsheet development and the associated metallurgical test work to derive an economically viable treatment route from two of these deposits are discussed. Key parameters affecting zinc recovery by gravity separation and flotation are presented, demonstrating that even minor differences in mineralogy have a profound impact on zinc recovery and reagent consumption. The study also deals with the determination of appropriate design parameters through metallurgical mapping of the dense media separation process.
“Full text available only in PDF format”
BONI, M. The Geology and Mineralogy of Non Sulfide Zinc Ore Deposits, Proceedings of LEAD & ZINC '05, Kyoto 17-19 October 2005, pp. 1299-1314. [ Links ]
CAPRONI, G, CICCU, R., GHIANI, M. and TRUDI, I. The Processing of Oxidised Lead and Zinc Ores in the Campo Pisano and San Giovanni Plants (Sardinia), Processing of Oxidised and Mixed Oxide-Sulphide Lead-Zinc Ores, Round Table Seminar 2, 13th International Mineral Processing Congress, Warsaw, Laskowski, J., (ed). 1979. pp. 69-91. [ Links ]
ENGLAND, T., HAND, P.E., MICHAEL, D.C., FALCON, L.M. and YELL, A.D. Coal Preparation in South Africa, South African Coal Processing Society, 2002. pp. 120-121. [ Links ]
MARABINI, A.M., ALESSE, V., BELARDI, G. and SPAZIANI, E. Effect of Depressing Agents on the Flotation of Oxidized Zinc Minerals, Minerals and Metallurgical Processing, May, 1994. pp. 97-104. [ Links ]
PEREIRA, C.A. and PERES, A.E.C. Reagents in calamine zinc ores flotation, Minerals Engineering, vol. 18, no. 2, February 2005, pp 275-277, Reagents '04. [ Links ]
REY, M., SITIA, G., RAFFINOT, P. and FORMANEK, V. Flotation of Oxidised Zinc Ores, Transactions of the AIME - Mining Engineering, April, 1954. pp. 416-420. [ Links ]