Valence variation of arsenic in bioleaching process of arsenic-bearing gold ore
查看参考文献20篇
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文摘
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The concentration and variational trend of As~(3+) and As~(5+), the bacterial resistance for the As~(3+) and As~(5+) and converting conditions from As~(3+) to As~(5+) were analyzed. The additive was used to prompt the bacterial leaching efficiency by changing valence state of arsenic. The results show that the concentration of As~(3+) is larger than that of As~(5+) in the lag phase. The concentration of As~(3+) decreases in the log phase, and is lower than that of As~(5+). HQ-0211 typed bacteria express better resistance for As~(3+) and As~(5+) and remain growing when the concentrations of As~(3+) and As~(5+) are above 6.0 g/L and 12.0 g/L, respectively. It is found that Fe~(3+) cannot oxidize As~(3+) singly as strong oxidant in the leaching system, but can cooperate with pyrite or chalcopyrite to do that. The oxidation of As~(3+) is prompted with addition of H_2O_2. The bacterial activity is improved in favor of bacterial leaching efficiency. NaClO restrains the bacterial growth to depress leaching efficiency because of the chloric compounds affecting bacterial activity. |
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来源
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Transactions of Nonferrous Metals Society of China
,2010,20(6):1171-1176 【核心库】
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DOI
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10.1016/s1003-6326(09)60274-0
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关键词
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As~(3+)
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As~(5+)
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bacterial leaching
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arsenic resistance
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oxidant
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arsenic-bearing gold ore
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地址
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School of Materials Science and Metallurgy, Northeastern University, Shenyang, 110004
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1003-6326 |
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学科
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化学工业 |
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基金
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国家自然科学基金
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国家863计划
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国家教育部高等学校博士学科点专项科研基金
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文献收藏号
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CSCD:3920442
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