Column bioleaching copper and its kinetics of waste printed circuit boards (WPCBs) by Acidithiobacillus ferrooxidans | |
Shu Chen; Yuankun Yang; Congqiang Liu; Faqin Dong; Bijun Liu | |
2015 | |
Source Publication | Chemosphere
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Volume | 141Pages:162-168 |
Abstract | Application of bioleaching process for metal recovery from electronic waste has received an increasing attention in recent years. In this work, a column bioleaching of copper from waste printed circuit boards (WPCBs) by Acidithiobacillus ferrooxidanshas been investigated. After column bioleaching for 28 d, the copper recovery reached at 94.8% from the starting materials contained 24.8% copper. Additionally, the concentration of Fe3+ concentration varied significantly during bioleaching, which inevitably will influence the Cu oxidation, thus bioleaching process. Thus the variation in Fe3+ concentration should be taken into consideration in the conventional kinetic models of bioleaching process. Experimental results show that the rate of copper dissolution is controlled by external diffusion rather than internal one because of the iron hydrolysis and formation of jarosite precipitates at the surface of the material. The kinetics of column bioleaching WPCBs remains unchanged because the size and morphology of precipitates are unaffected by maintaining the pH of solution at 2.25 level. In bioleaching process, the formation of jarosite precipitate can be prevented by adding dilute sulfuric acid and maintaining an acidic condition of the leaching medium. In such way, the Fe2+–Fe3+cycle process can kept going and create a favorable condition for Cu bioleaching. Our experimental results show that column Cu bioleaching from WPCBs by A. ferrooxidans is promising. |
Keyword | Copper Recovery waste Printed Circuit Boards acidithiobacillus Ferrooxidans column Bioleaching kinetic Model |
Indexed By | SCI |
Language | 英语 |
Document Type | 期刊论文 |
Identifier | http://ir.gyig.ac.cn/handle/42920512-1/9578 |
Collection | 环境地球化学国家重点实验室 |
Affiliation | 1.Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China 2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 3.Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China |
Recommended Citation GB/T 7714 | Shu Chen;Yuankun Yang;Congqiang Liu;Faqin Dong;Bijun Liu. Column bioleaching copper and its kinetics of waste printed circuit boards (WPCBs) by Acidithiobacillus ferrooxidans[J]. Chemosphere,2015,141:162-168. |
APA | Shu Chen;Yuankun Yang;Congqiang Liu;Faqin Dong;Bijun Liu.(2015).Column bioleaching copper and its kinetics of waste printed circuit boards (WPCBs) by Acidithiobacillus ferrooxidans.Chemosphere,141,162-168. |
MLA | Shu Chen;Yuankun Yang;Congqiang Liu;Faqin Dong;Bijun Liu."Column bioleaching copper and its kinetics of waste printed circuit boards (WPCBs) by Acidithiobacillus ferrooxidans".Chemosphere 141(2015):162-168. |
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