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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 6    December 2008

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Bio-oxidation of arsenopyrite
JIANG Tao(姜 涛), LI Qian(李 骞), YANG Yong-bin(杨永斌),
LI Guang-hui(李光辉), QIU Guan-zhou(邱冠周)

School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

Abstract:Oxidation of arsenopyrite with Acidithiobacillus ferrooxidans was studied. The electrochemical results show that arsenopyrite is firstly oxidized to As2S2 at the potential of 0.2−0.3 V (vs SHE) and As2S2 covers the electrode and retards the process continuously. While at higher potential over 0.3 V (vs SHE), As2S2 is oxidized to H3AsO3, and H3AsO3 is then oxidized to H3AsO4 at 0.8 V (vs SHE). The leaching results show that the addition of FeS2 can promote the oxidation of As3+ to As5+ and increase the activity of the bacteria. The best bio-oxidation technical parameters are the initial pH of 1.8−2.0, particle sizes less than 0.074 mm, temperature in the range of 25−30 ℃ and rotating speed of the orbital incubator of 100−160 r/min. The results provide theoretical and technological supports of bio-oxidation arsenopyrite for pretreating refractory arsenic gold ores.

 

Key words: arsenopyrite; electrochemistry; bio-oxidation; Acidithiobacillus ferrooxidans

ISSN 1672-7029
CN 43-1423/U

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