Author:
Mäkinen Jarno,Pietek Grzegorz,Miettinen Ville,Khoshkhoo Mohammad,Sundkvist Jan-Eric,Kinnunen Päivi
Abstract
Tailings are a residual material stream produced in the mineral processing of ores. They may contain a major sulphide content that increases the risk of acid rock drainage (ARD) but may also host valuable metals. Tank bioleaching is a technically viable method to treat sulphide tailings. However, a significant pyrrhotite content may cause increased acid and oxidant consumption and result in longer retention times in a bioleaching process. In this work, non-oxidative H2SO4 leaching of pyrrhotite is studied for high-sulphur tailings, both as a pre-treatment method and to consider the recovery possibilities of Fe and S. Continuous mode validation tests, conducted at 90 °C, pH 1.0 and 106 min retention time, resulted in a complete pyrrhotite dissolution with 427 kg/t acid consumption (as 95% H2SO4). Unwanted dissolution of Ni and Zn was taking place with a leaching yield of 21.5% and 13.5%, respectively, while Co and Cu dissolution was negligible. The continuous mode tests signalled that by shortening the retention time, Ni dissolution could be dramatically decreased. The non-oxidative pyrrhotite leaching produced a H2S-rich gas stream, which could be utilised in later metals’ recovery processes after bioleaching to precipitate (CoNi)S, ZnS and CuS products. The non-oxidative pyrrhotite leaching also produced a FeSO4 solution, with approximately 20 g/L of Fe.
Subject
Geology,Geotechnical Engineering and Engineering Geology
Reference22 articles.
1. Fuerstenau, M.C., Jameson, G.J., and Yoon, R.H. (2007). Froth Flotation: A Century of Innovation, Society for Mining, Metallurgy and Exploration Inc.
2. Wills, B.A., and Finch, J.A. (2015). Wills’ Mineral Processing Technology: An Introduction to the Practical Aspects of Ore Treatment and Mineral Recovery, Elsevier Science & Technology. [8th ed.].
3. Lottermoser, B.G. (2010). Mine Wastes, Characterization, Treatment and Environmental Impacts, Springer-Verlag. [3rd ed.].
4. Geochemical and mineralogical aspects of sulfide mine tailings;Lindsay;Appl. Geochem.,2015
5. Rawlings, D.E., and Johnson, D.B. (2007). Biomining, Springer.
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