Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第20卷    第10期    总第139期    2010年10月

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文章编号:1004-0609(2010)10-2057-06
细菌胞外聚合层在氧化含砷金精矿生物氧化过程中的作用
富  瑶,杨洪英,崔日成,范有静,王  承

(东北大学 材料与冶金学院,沈阳 110004)

摘 要: 通过研究含砷金精矿细菌氧化过程中各项工艺指标的变化,测定pH值、电压、砷离子浓度、细菌数量和胞外聚合层中多糖含量及结构,探讨胞外聚合层中多糖在细菌氧化含砷金精矿过程中的作用。结果表明:当电压由500 mV升到650 mV、As(Ⅲ)快速转化为As(Ⅴ)时,单个细菌可通过消耗胞外聚合层中的多糖来抵御砷离子的毒害;当电压稳定在650 mV、砷离子价态转化减缓时,细菌胞外聚合层中的多糖参与矿物的氧化反应;在砷离子胁迫下,多糖含量降低幅度可超过20%,即细菌可通过改变单个菌体胞外聚合层中多糖的产量来防止细胞受到侵害。

 

关键字: 含砷金精矿;细菌冶金;胞外聚合层;多糖

Role of extracellular polymers of bacteria during arsenic-bearing
gold concentrate biooxidation process
FU Yao, YANG Hong-ying, CUI Ri-cheng, FAN You-jing, WANG Cheng

School of Materials Science and Metallurgy, Northeastern University, Shenyang 110004, China

Abstract:The change of the physicochemical indexes was researched to explore the role of the extracellular polymers in the biooxidation process of arsenic-bearing gold concentrate. The pH value, potential of hydrogen, arsenic ion concentration, bacterial count, polysaccharide content and chemical bond in the extra cellular polymers (EPS) were tested. The results show that the bacterium exhausts its polysaccharide to resist the toxicity of arsenic ion when the potential increases from 500 mV to 650 mV and As(Ⅲ) transfers to As(Ⅴ) rapidly, and the bacteria oxidizes the concentrate by its polysaccharide when the potential remains 650 mV and the conversion of the arsenic ion retards. Under the stress of arsenic ion, the polysaccharide content of extracellular polymers decreases by more than 20%, and the bacterium changes its polysaccharide content to prevent the toxic ions.

 

Key words: arsenic-bearing gold concentrate; bacteria metallurgy; extracellular polymers; polysaccharide

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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