Valence variation of arsenic in bioleaching process of arsenic-bearing gold ore  

作　　者：崔日成 杨洪英 陈森 张硕 李科峰 

机构地区：[1]School of Materials Science and Metallurgy,Northeastern University(Shenyang)

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第6期1171-1175,共5页中国有色金属学报（英文版）

基　　金：Projects(50674029, 50874030) supported by the National Natural Science Foundation of China;Project(2006AA06Z127) supported by the National High-tech Research and Development Program of China;Project(20060145015) supported by Specialized Research Fund for the Doctoral Program of Higher Education, China

摘　　要：The concentration and variational trend of As3 +and As 5+,the bacterial resistance for the As 3+and As 5+and converting conditions from As3 +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 As5 +.HQ-0211 typed bacteria express better resistance for As 3+and As 5+and remain growing when the concentrations of As3 +and As 5+are above 6.0 g/L and 12.0 g/L,respectively.It is found that Fe 3+cannot oxidize As3 +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 H2O2.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.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 H2O2.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.

关 键 词：As^3 ＋ As ^5＋ bacterial leaching arsenic resistance OXIDANT arsenic-bearing gold ore 

分 类 号：X703[环境科学与工程—环境工程]