2001•Institute of Process Engineering, CAS Institutional RepositoryOpen access

Effect of technological factors on bacterial leaching of low-grade Ni-Cu sulfide ore

ZH Fang, QJ Chen

Abstract

The bioleaching of a low-grade Ni-Cu sulfide ore from Jinchuan Mine with Thiobacillus ferrooxidans (TF5) and Thiobacillus thiooxidans (TT) was investigated. The effect of pH, the initial cell numbers of bacteria, the pulp density and the ratio of TF5 and TT on leaching was described, and the favorable bioleaching conditions for the ore were experimentally confirmed. The aeration leaching, agitation leaching with air bubbling, and column leaching were respectively tested. The highest recovery was achieved in the aeration leaching. After leaching for 20 d with pulp density of 15% the extractions of Ni, Cu and Co were respectively 95.4%, 48.6% and 82.6%.

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Key concepts: Bioleaching, Leaching (pedology), Aeration, Thiobacillus ferrooxidans, Chemistry, Sulfide, Thiobacillus, Metallurgy