Bacterial oxidation activity in heap leaching^①

来源期刊：中南大学学报(英文版)2004年第4期

论文作者：柳建设 夏海波 王兆慧 胡岳华

文章页码：375 - 379

Key words：heap bioleaching; oxidation activity; bacteria

Abstract: Bioleaching of sulfide minerals by bacteria, mainlyThiobacillus ferrooxidans ( T. f.)andThiobacillus thiooxidans,plays an important role in hydrometallurgy because of its economic and environmental attractions. The surveys of production process and the bacterial oxidation activity in the heap bioleaching were investigated. The results show that pH value is high, bacteria biomass and ferric concentration are low, generation time (above 7.13 h) is long in leachate, and less bacteria are adsorbed on the ores. The bacteria in the leachate exposing on the surface and connecting with mineral, have much faster oxidation rate of Fe(Ⅱ) and shorter generation time, compared with those which are in the reservoir for a long time. There is diversity for oxidation activity of Fe(Ⅱ), while there is no diversity for oxidation of sulfur. So it is advisable to add sulfuric acid to degrade pH value to 2.0, add nutrients and shorten recycling time of leachate, so as to enhance bacteria concentration of leachate and the leaching efficiency.

基金信息：the National Natural Science Foundation of China