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Journal of the Southern African Institute of Mining and Metallurgy

On-line version ISSN 2411-9717
Print version ISSN 0038-223X

J. S. Afr. Inst. Min. Metall. vol.108 n.5 Johannesburg May. 2008




Outotec direct leaching application in China



T. HaakanaI; B. SaxénI; L. LehtinenI; H. TakalaI; M. LahtinenII; K. SvensII; M. RuonalaII; X. GongmingIII

IOutotec Research Oy, Pori, Finland
IIOutotec Oyj, Base Metals, Espoo, Finland
IIIZhuzhou Smelter Group Co., Ltd., Qingshuitang, Zhuzhou, Hunan, P.R. China




Outotec's direct leaching process is an atmospheric leaching process for sulphidic zinc concentrates. The direct leaching process, based on special leaching reactors developed by Outokumpu, is the most economical way to produce electrolytic zinc. The production scale applications of the process realized so far are in use at Boliden's Kokkola and Odda zinc plants.
A new full-scale application of Outotec's direct leaching process will be started in 2008 in China. The process is integrated into the existing production plant, replacing part of the old production facilities by modern technology. Besides high zinc extraction the plant expansion and modernization offers also indium recovery, iron precipitation and solution purification processes. The process equipment includes tailor-made reactors designed on the basis of the work and experience of Outotec research centre.

Keywords: zinc, concentrate, atmospheric leaching, technology, indium, iron precipitation, solution purification, Outotec



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