生物浸取电解锰渣中锰的研究  

Study on bioleaching of manganese from electrolytic manganese residue

作　　者：李焕利[1] 李小明[2] 陈敏[1] 曹建兵[1] 杨麒[1] 曾光明[1] 刘精今[1] 

机构地区：[1]湖南大学环境科学与工程学院,长沙410082 [2]环境生物与控制教育部重点实验室(湖南大学),长沙410082

出　　处：《环境工程学报》2009年第9期1667-1672,共6页Chinese Journal of Environmental Engineering

基　　金：湖南省科技计划重点项目(2007WK2004);新世纪优秀人才支持计划项目(NCET-04-0770)

摘　　要：为了评价生物法浸取电解锰渣中锰的可行性,利用锰渣土壤中筛选出的2种锰抗性强的微生物Serratiasp.和Fusariumsp.浸取电解锰渣中的锰,并采用优化的BCR(European Commun ity Bureau of Reference)连续萃取方案对浸取前后的金属锰进行形态分析,研究其浸出率和浸取前后锰的形态变化特征。同时考察了3种萃取剂EDTA、HNO3和CaC l2对锰的萃取效率及萃取后金属锰的形态变化。研究结果表明,Serratiasp.和Fusariumsp.对锰都表现出一定的浸取能力,Fu-sariumsp.的浸取能力尤为显著,3 d后锰浸出率达到56.5%,为锰污染的微生物治理和资源化利用提供科学依据。3种萃取剂对锰的浸取效果为EDTA>HNO3>CaC l2,平均萃取效率依次为50.0%、28.8%和21.2%。浸取前后,酸溶解态锰所占比例变化较显著,说明酸溶解态锰是比较容易浸取的形态。Two microorganisms identified as Serratia sp. and Fusarium sp. were used to leach Mn in this paper. The redistribution of Mn was determined using the sequential extraction procedures of the optimized European Community Bureau of Reference （BCR） before and after leaching. Extractions were compared with chemical leaching, where EDTA, HNO3 and CaCl2 were used as extractants. Results indicated that Serratia sp. and Fusarium sp. , particularly Fusarium sp. whose leaching efficiency was 56.5% after three days, both showed strong leaching capacity for Mn, providing a scientific basis for manganese residue pollution treatment and resource utilization. The extractability of extractants for Mn was in the order EDTA 〉HNO3 〉CaCl2 and the extractable efficiencies were 50.0% ,28.8% and 21.2% respectively. After leaching, the proportion of Mn in acid-extraction fraction varied considerably, showing that the acid-extraction fraction was proned to be leached.

关 键 词：电解锰渣 金属锰 化学萃取 生物浸取 形态 

分 类 号：X753[环境科学与工程—环境工程]