Recovery of metallic copper from waste printed circuit boards via H3NO3S-NaCl-H2O2 leaching system

被引：16
作者：
Guo, Shulian [1 ,2 ]
He, Jingfeng [1 ,2 ,3 ,4 ]
Zhu, Lingtao [1 ,2 ]
Chen, Hao [1 ,2 ]
Zhou, Kui [1 ,2 ]
Xu, Jiang [1 ,2 ]
Chen, Zengqiang [1 ,2 ]
机构：
[1] China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Peoples R China
[2] China Univ Min & Technol, Key Lab Coal Proc & Efficient Utilizat Minist Educ, Xuzhou 221116, Peoples R China
[3] Beijing Min & Met Technol Grp Co Ltd, State Key Lab Mineral Proc Sci & Technol, Beijing 100160, Peoples R China
[4] Huaiyin Inst Technol, Natl & Local Joint Engn Res Ctr Deep Utilizat Mine, Huaian 223003, Peoples R China
来源：
JOURNAL OF CLEANER PRODUCTION | 2022年 / 357卷
基金：
中国国家自然科学基金;
关键词：
Waste printed circuit boards; Sulfamic acid; Thermodynamic analysis; Kinetic analysis; Leaching rate; CHALCOPYRITE; DISSOLUTION; EXTRACTION; SEPARATION; CU2+;
D O I：
10.1016/j.jclepro.2022.131732
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this study, sulfamic acid (H3NO3S) was used to leach Cu from waste printed circuit boards (WPCBs) by using hydrogen peroxide as strong oxidant and NaCl as additive. The effects of NaCl concentration, sulfamic acid concentration, hydrogen peroxide concentration, temperature and reaction time on copper leaching were investigated. Under the optimum operated conditions, the leaching rate of copper was 91.24%. The thermodynamic analysis predicted that the dissolution of copper was promoted by adding NaCl to the mixed leaching solution of H3NO3S and H2O2. Kinetic analysis shows that the leaching process was controlled by solid film diffusion with an apparent activation energy of 7.78 kJ/mol. Through the analysis of zoom stereo microscope and X-ray diffraction (XRD), copper failed to completely leach because it was wrapped by insoluble substances, which prevented further leaching of copper. The leaching of copper from WPCBs with H3NO3S-NaCl-H2O2 system was an efficient and environmentally friendly method. Based on this study, a new process for recovering WPCBs is proposed.
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页数：9
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