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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 6    December 2002

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Submicro-battery effect and selective bio-oxidation model of gold-bearing arsenopyrite by
  Thiobacillus ferrooxidans
YANG Hong-ying(杨洪英), YANG Li(杨立),ZHAO Yu-shan(赵玉山), 
CHEN Gang(陈 刚),LU Jiu-ji(吕久吉), FAN You-jing(范有静)

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

Abstract:Through the study by electronic probe it was found that many new cracks and holes appear on the surface of gold-bearing arsenopyrite crystal oxidized by Thiobacillus ferrooxidans, which are along with some directions. Then the selective bio-oxidation model of gold-bearing arsenopyrite was set up. The selective bio-oxidation resulting from the submicro-battery effect of gold/ arsenopyrite mineral pairs naturally forms in the gold-bearing arsenopyrite crystal. Thiobacillus ferrooxidans has priority to oxidize the place of gold-rich and oxidizes selectedly along with the crystal border, crystal face and crack. The bacteria oxidation process of gold-bearing arsenopyrite is divided into three stages: the first stage is the surface oxidation, the second stage is restraining oxidation and the third stage is the filament oxidation, bacteria oxidize along with cracks of arsenopyrite.

 

Key words:  selective bio-oxidation model; submicro-battery effect; gold-bearing arsenopyrite; Thiobacillus ferrooxidans

ISSN 1672-7029
CN 43-1423/U

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