Efficient and stable leaching of gold in a novel ethydiaminedhephen acetic-thiosulfate system
[Display omitted] •A novel and stable EDDHA-thiosulfate leaching system is proposed.•Including EDDHA decreases solution mixed potential and thiosulfate consumption.•Little passivation on the surface of gold flakes at leaching in the new system. Gold thiosulfate leaching is renowned for its non-toxic...
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| Published in | Minerals engineering Vol. 209; p. 108639 |
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| Main Authors | , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Ltd
01.04.2024
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| Subjects | |
| Online Access | Get full text |
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| Abstract | [Display omitted]
•A novel and stable EDDHA-thiosulfate leaching system is proposed.•Including EDDHA decreases solution mixed potential and thiosulfate consumption.•Little passivation on the surface of gold flakes at leaching in the new system.
Gold thiosulfate leaching is renowned for its non-toxic and high leaching efficiency. However, in traditional thiosulfate leaching systems, the presence of a high mixed potential and oxidizing metal ions in the solution environment leads to the consumption of thiosulfate through oxidation and causes passivation of the gold surface. Here, we proposed a novel thiosulfate leaching system mainly using non-toxic copper-ethydiaminedhephen acetic (EDDHA) replacing the conventional copper-ammonia. In this system, the gold leaching process mainly catalyzed by the stable Cu-EDDHA complex ion (as oxidizing agent analyzed by UV–vis spectrophotometer). The complexation of Cu(II) attributed to EDDHA reduces the mixed potential in the leaching process. The coordination also prevents the oxidation of thiosulfate by free copper ions. Accordingly, thiosulfate consumption during leaching is minimized, as it mitigates oxidation and self-decomposition. Besides, Raman and XPS spectrum demonstrate that introduce of EDDHA into the thiosulfate system can effectively eliminate the harmful surface passivation of gold, which enhance the gold leaching efficiency. In addition, by fulfilling a set of conditions, a gold extraction of 82.84 % can be attained in new system compared with 56.02 % for conventional cyanide leaching. Further, adding EDDHA to the thiosulfate leach reduced the reagent consumption from 103.19 kg/t to 10.54 kg/t. The results are benefits to the development and utilization of thiosulfate gold leaching. |
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| AbstractList | [Display omitted]
•A novel and stable EDDHA-thiosulfate leaching system is proposed.•Including EDDHA decreases solution mixed potential and thiosulfate consumption.•Little passivation on the surface of gold flakes at leaching in the new system.
Gold thiosulfate leaching is renowned for its non-toxic and high leaching efficiency. However, in traditional thiosulfate leaching systems, the presence of a high mixed potential and oxidizing metal ions in the solution environment leads to the consumption of thiosulfate through oxidation and causes passivation of the gold surface. Here, we proposed a novel thiosulfate leaching system mainly using non-toxic copper-ethydiaminedhephen acetic (EDDHA) replacing the conventional copper-ammonia. In this system, the gold leaching process mainly catalyzed by the stable Cu-EDDHA complex ion (as oxidizing agent analyzed by UV–vis spectrophotometer). The complexation of Cu(II) attributed to EDDHA reduces the mixed potential in the leaching process. The coordination also prevents the oxidation of thiosulfate by free copper ions. Accordingly, thiosulfate consumption during leaching is minimized, as it mitigates oxidation and self-decomposition. Besides, Raman and XPS spectrum demonstrate that introduce of EDDHA into the thiosulfate system can effectively eliminate the harmful surface passivation of gold, which enhance the gold leaching efficiency. In addition, by fulfilling a set of conditions, a gold extraction of 82.84 % can be attained in new system compared with 56.02 % for conventional cyanide leaching. Further, adding EDDHA to the thiosulfate leach reduced the reagent consumption from 103.19 kg/t to 10.54 kg/t. The results are benefits to the development and utilization of thiosulfate gold leaching. |
| ArticleNumber | 108639 |
| Author | Zhang, Qi Wu, Chunhui Hou, Lei Chen, Peng Zainiddinovich, Nasriddinov Zamoniddin Zhang, Guowei Alejandro, López Valdivieso Chen, Yu Jia, Feifei |
| Author_xml | – sequence: 1 givenname: Guowei surname: Zhang fullname: Zhang, Guowei organization: Key Laboratory of Green Utilization of·Critical·Non-metallic·Mineral Resources of Ministry of Education, Wuhan University of Technology, Wuhan, 43007, China – sequence: 2 givenname: Lei surname: Hou fullname: Hou, Lei email: leihou129@163.com organization: School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 43007, China – sequence: 3 givenname: Peng surname: Chen fullname: Chen, Peng organization: Key Laboratory of Green Utilization of·Critical·Non-metallic·Mineral Resources of Ministry of Education, Wuhan University of Technology, Wuhan, 43007, China – sequence: 4 givenname: Qi surname: Zhang fullname: Zhang, Qi organization: Key Laboratory of Green Utilization of·Critical·Non-metallic·Mineral Resources of Ministry of Education, Wuhan University of Technology, Wuhan, 43007, China – sequence: 5 givenname: Yu surname: Chen fullname: Chen, Yu organization: Key Laboratory of Green Utilization of·Critical·Non-metallic·Mineral Resources of Ministry of Education, Wuhan University of Technology, Wuhan, 43007, China – sequence: 6 givenname: Nasriddinov Zamoniddin surname: Zainiddinovich fullname: Zainiddinovich, Nasriddinov Zamoniddin organization: Mining-Metallurgical Institute of Tajikistan, Chkalovsk, 735046, Tajikistan – sequence: 7 givenname: Chunhui surname: Wu fullname: Wu, Chunhui organization: Tibetsummit-Resources-Co., LTD, Lhasa, 850000, China – sequence: 8 givenname: López Valdivieso surname: Alejandro fullname: Alejandro, López Valdivieso organization: Instituto·de Metalurgia, Universidad Autónoma de San Luís Potosí Av. Sierra Leona 550, San Luís·Potosí, S. L. P. 78210, Mexico – sequence: 9 givenname: Feifei surname: Jia fullname: Jia, Feifei email: feifeijia@whut.edu.cn organization: Key Laboratory of Green Utilization of·Critical·Non-metallic·Mineral Resources of Ministry of Education, Wuhan University of Technology, Wuhan, 43007, China |
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| Cites_doi | 10.1016/j.mineng.2022.107475 10.1016/j.susc.2014.05.019 10.1016/j.electacta.2021.138752 10.1016/j.mineng.2021.107079 10.1007/s11837-019-03648-9 10.1016/0304-386X(88)90041-2 10.1016/j.mineng.2020.106336 10.1016/j.hydromet.2019.105204 10.1016/j.mineng.2016.01.011 10.1016/j.mineng.2009.11.009 10.1016/j.mineng.2011.04.017 10.1016/j.cherd.2020.09.029 10.1016/j.micromeso.2005.07.008 10.1016/j.electacta.2016.06.009 10.1016/j.hydromet.2018.10.009 10.1016/j.mineng.2013.05.027 10.1016/S0301-7516(03)00108-X 10.1016/j.mineng.2006.10.001 10.1016/j.mineng.2020.106476 10.1016/j.jhazmat.2024.133430 10.1016/j.mineng.2004.01.008 10.1016/j.hydromet.2018.05.014 10.1007/s11104-005-8218-5 10.1016/j.hydromet.2003.12.002 10.1021/acssuschemeng.9b06639 10.1016/S0892-6875(00)00172-2 10.1007/s10008-013-2320-z 10.1016/j.hydromet.2017.04.006 10.1016/j.envint.2007.04.007 10.1016/j.mineng.2010.10.007 10.1016/j.hydromet.2004.06.004 10.1016/j.mineng.2023.108273 10.1016/j.jclepro.2019.06.182 10.1016/S1003-6326(21)65745-X 10.1016/j.envpol.2010.07.004 10.1021/acs.jafc.6b03274 |
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| Keywords | Novel system Ethydiaminedhephen acetic Mixed potential Gold thiosulfate leaching Passivation |
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•A novel and stable EDDHA-thiosulfate leaching system is proposed.•Including EDDHA decreases solution mixed potential and thiosulfate... |
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| SubjectTerms | Ethydiaminedhephen acetic Gold thiosulfate leaching Mixed potential Novel system Passivation |
| Title | Efficient and stable leaching of gold in a novel ethydiaminedhephen acetic-thiosulfate system |
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