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| Experimental study on removal of arsenic by alkaline leaching of copper concentrate with a high arsenic content |
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Received:September 25, 2023
Revised:October 23, 2023
Accepted:October 24, 2023
Published Online:March 24, 2025
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| DOI： |
| KeyWord:High-arsenic copper concentrate; Alkaline leaching; Arsenic removal |
| Author | Institution |
| ZHENG Yongxing |
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming University of Science and Technology,Kunming |
| XIExiaochen |
Faculty of Land Resource Engineering of Kunming University of Science and Technology |
| YANG chen |
School of Metallurgical Engineering of Kunming University of Technology Kunming |
| WANG heng |
School of Metallurgical Engineering of Kunming University of Technology Kunming |
| LIU guokai |
Faculty of Land Resource Engineering of Kunming University of Science and Technology |
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| Abstract: |
| In this paper, a high-arsenic copper concentrate was investigated by chemical analyses, XRD and EMPA. Meanwhile, the Eh-pH diagram was drawn. The alkaline sodium hydroxide-sodium sulfide system was proposed to remove arsenic from the concentrate. These factors such as sodium hydroxide concentration, sodium sulfide dosage, leaching temperature, stirring speed, liquid-solid ratio, and leaching time were systematically examined. The optimum leaching rate of arsenic in the high-arsenic copper concentrate reached 60.55 % in the system. The leaching residue was further investigated by EMPA-EDS. The results showed that the arsenic in the leaching residue mainly existed in the form of zinc-bearing enargite and tennatite, resulting in a low removal rate. Iron oxides were formed and then covered at the surface of arsenic-bearing minerals, that inhibited the interaction of leaching reagents with the arsenic-bearing minerals. Thus, the leaching rate of arsenic decreased. The present study of leaching behavior of arsenic in the sodium hydroxide-sodium sulfide system lay a foundation for clean utilization of high-arsenic copper concentrate. |
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