Bio-dissolution of pyrite by Phanerochaete chrysosporium

被引：21
|
作者：
Yang, Hong-ying [1 ]
Liu, Qian [1 ,2 ]
Chen, Guo-bao [1 ]
Tong, Lin-lin [1 ]
Ali, Auwalu [1 ]
机构：
[1] Northeastern Univ, Sch Met, Shenyang 110819, Liaoning, Peoples R China
[2] Shanghai Polytech Univ, Shanghai Collaborat Innovat Ctr WEEE Recycling, Shanghai 201209, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2018年 / 28卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Phanerochaete chrysosporium; pyrite; bio-dissolution; Carlin-type gold ores; electrochemistry; REFRACTORY GOLD ORES; ASPERGILLUS-NIGER; HEAVY-METALS; OXIDATION; ARSENOPYRITE; ACID; BIOTRANSFORMATION; FERROOXIDANS; PRETREATMENT; MECHANISM;
D O I：
10.1016/S1003-6326(18)64709-0
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The dissolution of pyrite was studied with Phanerochaete chrysosporium (P. chrysosporium). This fungus resulted in the dissolution of 18% iron and 33% sulfur. The oxidization layer was formed on the pyrite surface, which probably consisted of iron oxide, iron oxy-hydroxide, iron sulfate, elemental sulfur and mycelia. The electrochemical characteristics of pyrite were studied in the systems without and with P. chrysosporium. P. chrysosporium could accelerate the dissolution of pyrite by decreasing pitting potential and polarization resistance plus improving polarization current, corrosion potential and corrosion current density. The dissolution of pyrite is the combined effect of enzymes, hydrogen peroxide, ferric iron and organic acids. Enzymes attack the chemical bonds by free radicals. Organic acids dissolve pyrite by acidolysis and complexolysis. Enzymes and hydrogen peroxide play an essential role in this process.
引用
收藏
页码：766 / 774
页数：9
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