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中南大学学报(自然科学版)

Journal of Central South University

第41卷    第4期    总第194期    2010年8月

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文章编号:1672-7207(2010)04-1223-06
嗜铁钩端螺旋菌对黄铁矿浸出的影响
顾帼华,孙小俊,李建华,苏丽君,刘玉林,赵开乐

(中南大学 资源加工与生物工程学院,湖南 长沙,410083)

摘 要: 以嗜铁钩端螺旋菌(L. ferriphilum)为实验菌株,考察不同矿浆浓度、接种量、初始pH和初始Fe3+浓度对黄铁矿浸出的影响。试验结果表明:提高矿浆浓度和初始Fe3+浓度会降低黄铁矿浸出率;增大接种量和降低初始pH有利于黄铁矿浸出;在浸出试验过程中定期调整pH,浸出几天后,由于黄钾铁矾生成,不利于黄铁矿浸出;在浸出过程中,生成的黄钾铁矾以结晶颗粒的形式覆盖在黄铁矿表面,表明L. ferriphilum浸出黄铁矿的机制以间接作用为主。

 

关键字: 黄铁矿;嗜铁钩端螺旋菌;生物浸出;黄钾铁矾;氧化还原电位

Bioleaching of pyrite by L. ferriphilum
GU Guo-hua, SUN Xiao-jun, LI Jian-hua, SU Li-jun, LIU Yu-lin, ZHAO Kai-le

School of Resources Processing and Bio-engineering, Central South University, Changsha 410083, China

Abstract:Pyrite oxidation rates were examined in various conditions in the presence of L. ferriphilum, in which different pulp concentrations, inoculation amounts, initial Fe3+ concentrations and initial pH were performed. The results show that increasing pulp concentration can decrease the leaching rate of iron, and high initial Fe3+ concentration is also adverse to leach pyrite. Increasing inoculation amount and lowering initial pH are beneficial to leach pyrite. Adjusting pH in leaching process makes against leaching pyrite due to formed jarosite. Jarosite formed in leaching process is observed with XRD, SEM and EDS analysis, and a considerable amount of debris, with a crystalline morphology is present on the surface of pyrite. Indirect action is more important in bioleaching pyrite.

 

Key words: pyrite; L. ferriphilum; bioleaching; jarosite; redox potential

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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