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极端嗜热硫杆菌浸出黄铁矿

ISSN号：1001-053X
期刊名称：北京科技大学学报
时间：2013.7.7
页码：850-855
分类：TF803.21[冶金工程—有色金属冶金] TD752.2[矿业工程—矿井通风与安全]
作者机构：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083, [2]中国科学院微生物研究所,北京100101
相关基金：国家自然科学基金资助项目（50934002,51074013）; 新世纪优秀人才支持计划资助项目（NECT-07-0070）; 教育部长江学者和创新团队发展计划资助项目（IRT0950）
相关项目：堆浸体系中孔隙演化对渗流特性的影响机制

关键词：黄铁矿, 生物浸矿, 生物脱硫, 酸性, 表面形貌, pyrites, bioleaching, biodesulfurization, acidity, surface morphology

中文摘要：

为了探讨极端嗜热菌在高铁、高酸和高温条件下生物脱硫的可行性,采用从腾冲热海酸性温泉分离出的一株新型极端嗜热硫杆菌开展了四组不同初始pH值条件下的黄铁矿生物柱浸实验.该菌株能耐受pH值为0.58、全铁质量浓度为38.9 g.L 1的高酸高铁环境,同时维持580～640 mV的较低电位.初始pH值为2时,浸出28 d后黄铁矿浸出率达到最高为17.8%.生物浸出时,菌株生长依次表现出较明显的迟缓期、对数期和稳定期,且降低初始pH值会延长其到达稳定期的时间.此外,70℃高温和全铁质量浓度为38.9 g.L 1的高铁体系能促进生成黄钾铁矾和少量单质硫沉淀,而菌株能在pH值小于0.9时将大部分S0氧化为SO24.

英文摘要：

In order to investigate the feasibility of biodesulfurization by an extreme thermophile in high iron concentration, high acidity and elevated temperature environment, four groups of pyrite column bioleaching experiments at variable initial pH values were carried out by using a novel strain of extreme thermophilic Thiobacillus which was isolated from Rehai acidic hot spring in Tengchong in southwestern China. It is found that the new strain is resistant to high acid and high iron environment in which the pH value is 0.58 and the soluble iron concentration is 38.9 g-L-1, while the redox potential maintains at a low level from 580 to 640 mV. The highest value of iron recovery can reach up to 17.8% after leaching for 28 d when the initial pH value is 2. The bacterial growth evidently represents a lag phase, a logarithmic phase and a stationary phase sequentiMly in the traditional bioleaching route, while reducing the initial pH value can prolong the time of reaching the steady periodical. In addition, precipitation formation of jarosite and a little sulfur is promoted in the high iron system of which the total iron concentration is 38.9 g.L-1 and the temperature is 70 ℃. The novel strain can oxidize the majority of SO to SO42- even when the pH value is lower than 0.9.