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	Chemical dissolving of citric acid on bioleaching of copper mine tailings by Acidithiobacillus ferrooxidans ATCC 23270
	Li, Dou1; Yin, Yajie1; Jiao, Binquan2; Song, Liyan1; Wang, Yangqing1; Qiao, Jing1; Xu, Zhonghui3
	2013-12-01
摘要	Bioleaching could be a lower energy consumption and environmental friendly technology to recover precious metals from copper mine tailings and reduce its environmental risk. The citric acid is ubiquitous in copper mine tailings and its effects on bioleaching of copper mine tailings are unknown. The purpose of this study was to assess influence of the agents on bioleaching effect and estimating the mechanism. In this work, bioleaching of copper mine tailings using Acidithiobacillus ferrooxidans ATCC 23270 under aerobic conditions was conducted with addition of citric acid of different concentrations. The results from the detection of Cu, Mn, As, total Fe, ferric, ferrous, pH, Eh and cell numbers in leachate during the 30 days showed that the citric acid accelerated the metals leaching. The scanning electron microscope (SEM) images demonstrated the aggregates and tracks of acid attack that could prove the bioleaching results on the other hand and the chemical dissolving played an important role in the bioleaching process.
关键词	Bioleaching copper mine tailings Acidithiobacillus ferrooxidans ATCC 23270 citric acid
发表期刊	RESEARCH JOURNAL OF BIOTECHNOLOGY
ISSN	0973-6263
卷号	8期号:12页码:37-41
通讯作者	Li, D (reprint author), Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 401122, Peoples R China.
收录类别	SCI
WOS记录号	WOS:000327401500008
语种	英语