Microwave improving copper extraction from chalcopyrite through modifying the surface structure
Microwave-assisted leaching as a green and efficient method for leaching chalcopyrite has attracted increasing attention. Researchers have actively explored the reasons why microwaves have a positive impact on copper extraction. In this work, X-ray diffraction (XRD), an optical microscope, electron...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-01-01
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| Series: | Journal of Materials Research and Technology |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785418313504 |
| _version_ | 1828761545416376320 |
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| author | Tong Wen Yunliang Zhao Qiulin Ma Qihang Xiao Tingting Zhang Jianxin Chen Shaoxian Song |
| author_facet | Tong Wen Yunliang Zhao Qiulin Ma Qihang Xiao Tingting Zhang Jianxin Chen Shaoxian Song |
| author_sort | Tong Wen |
| collection | DOAJ |
| description | Microwave-assisted leaching as a green and efficient method for leaching chalcopyrite has attracted increasing attention. Researchers have actively explored the reasons why microwaves have a positive impact on copper extraction. In this work, X-ray diffraction (XRD), an optical microscope, electron probe micro-analyzer (EPMA) and field emission scanning electron microscope with energy dispersive spectrometer (SEM-EDS) were employed to investigate the surface structure modification of chalcopyrite by microwave during leaching. The modified chalcopyrite had a positive effect on better mineral leachability, higher effective surface for leaching, and the fewer passivation layer. The superior mineral leachability was related to the surplus intermediate products of covellite, while microwave promoted the conversion of chalcopyrite to covellite. In addition, microwave is capable of increasing active sites upon the removal of the passivation layer and the enlargement of the effective reaction surface. This work summarized the relationship between the high copper recovery and the surface structure modification of chalcopyrite systematically. Keywords: Microwave-assisted leaching, Chalcopyrite, Modification, Surface structure, Passivation layer |
| first_indexed | 2024-12-11T01:30:50Z |
| format | Article |
| id | doaj.art-a0ec274bb212443fa749a243b3224829 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-11T01:30:50Z |
| publishDate | 2020-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-a0ec274bb212443fa749a243b32248292022-12-22T01:25:21ZengElsevierJournal of Materials Research and Technology2238-78542020-01-0191263270Microwave improving copper extraction from chalcopyrite through modifying the surface structureTong Wen0Yunliang Zhao1Qiulin Ma2Qihang Xiao3Tingting Zhang4Jianxin Chen5Shaoxian Song6Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, ChinaHubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; Corresponding author.Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, ChinaHubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, ChinaHubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, ChinaHubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, ChinaHubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, ChinaMicrowave-assisted leaching as a green and efficient method for leaching chalcopyrite has attracted increasing attention. Researchers have actively explored the reasons why microwaves have a positive impact on copper extraction. In this work, X-ray diffraction (XRD), an optical microscope, electron probe micro-analyzer (EPMA) and field emission scanning electron microscope with energy dispersive spectrometer (SEM-EDS) were employed to investigate the surface structure modification of chalcopyrite by microwave during leaching. The modified chalcopyrite had a positive effect on better mineral leachability, higher effective surface for leaching, and the fewer passivation layer. The superior mineral leachability was related to the surplus intermediate products of covellite, while microwave promoted the conversion of chalcopyrite to covellite. In addition, microwave is capable of increasing active sites upon the removal of the passivation layer and the enlargement of the effective reaction surface. This work summarized the relationship between the high copper recovery and the surface structure modification of chalcopyrite systematically. Keywords: Microwave-assisted leaching, Chalcopyrite, Modification, Surface structure, Passivation layerhttp://www.sciencedirect.com/science/article/pii/S2238785418313504 |
| spellingShingle | Tong Wen Yunliang Zhao Qiulin Ma Qihang Xiao Tingting Zhang Jianxin Chen Shaoxian Song Microwave improving copper extraction from chalcopyrite through modifying the surface structure Journal of Materials Research and Technology |
| title | Microwave improving copper extraction from chalcopyrite through modifying the surface structure |
| title_full | Microwave improving copper extraction from chalcopyrite through modifying the surface structure |
| title_fullStr | Microwave improving copper extraction from chalcopyrite through modifying the surface structure |
| title_full_unstemmed | Microwave improving copper extraction from chalcopyrite through modifying the surface structure |
| title_short | Microwave improving copper extraction from chalcopyrite through modifying the surface structure |
| title_sort | microwave improving copper extraction from chalcopyrite through modifying the surface structure |
| url | http://www.sciencedirect.com/science/article/pii/S2238785418313504 |
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