Effective recovery of Ti as anatase nanoparticles from waste red mud via a coupled leaching and boiling route
Red mud (RM) a solid waste generated by the bauxite smelting industry, is a rich source of metal resources, especially Ti, and its recycling can bring significant environmental and economic benefits. In this study, precious metal Ti was efficiently recovered from red mud using a coupled acid leachin...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-05-01
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| Series: | Frontiers in Chemistry |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fchem.2023.1201390/full |
| _version_ | 1797824134856572928 |
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| author | Zhan Qu Jiancong Liu Ting Su Suiyi Zhu Junzhen Liu Yusen Chen |
| author_facet | Zhan Qu Jiancong Liu Ting Su Suiyi Zhu Junzhen Liu Yusen Chen |
| author_sort | Zhan Qu |
| collection | DOAJ |
| description | Red mud (RM) a solid waste generated by the bauxite smelting industry, is a rich source of metal resources, especially Ti, and its recycling can bring significant environmental and economic benefits. In this study, precious metal Ti was efficiently recovered from red mud using a coupled acid leaching and boiling route for the effective separation of low-value metals. The red mud which contained mainly 10.69% Si, 12.1% Al, 15.2% Ca, 10.99% Fe, and 4.37% Ti, was recovered in five steps. First, a nitric acid solution was used to leach the metals in multiple stages, resulting in an acidic leach solution with high concentrations of Fe, Al, Ti, and Ca ions 2.7 g/L, 4.7 g/L, 5.43 g/L, and 1.8 g/L, respectively. Then, a small amount of sucrose was added as a catalyst to recover Ti from the leach solution under hydrothermal conditions, resulting in the targeted recovery of 98.6% of Ti in the form of high-purity anatase while Fe, Al, and Ca remained in the solution. Next, the Fe in solution was separated as hematite products at a temperature of 110°C and a reaction time of 4 h. Similarly, the Al in the solution was separated and precipitated as boehmite by heating it at 260°C for a reaction time of 20 h. Finally, the remaining Ca in solution was recovered by simple pH regulation. Economic accounting assessment showed that the method yields $101.06 for 1 t of red mud treated, excluding labor costs. This study provides a novel approach to recover precious metals from metal wastes through the whole process resource recovery of solid waste red mud. |
| first_indexed | 2024-03-13T10:34:30Z |
| format | Article |
| id | doaj.art-e3e1d1d952cf4fb48572220bbc4c810e |
| institution | Directory Open Access Journal |
| issn | 2296-2646 |
| language | English |
| last_indexed | 2024-03-13T10:34:30Z |
| publishDate | 2023-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Chemistry |
| spelling | doaj.art-e3e1d1d952cf4fb48572220bbc4c810e2023-05-18T07:24:40ZengFrontiers Media S.A.Frontiers in Chemistry2296-26462023-05-011110.3389/fchem.2023.12013901201390Effective recovery of Ti as anatase nanoparticles from waste red mud via a coupled leaching and boiling routeZhan Qu0Jiancong Liu1Ting Su2Suiyi Zhu3Junzhen Liu4Yusen Chen5State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu, ChinaLversheng Environmental Technology Co., Ltd., Chongqing, ChinaScience and Technology Innovation Centre for Municipal Wastewater Treatment and Water Quality Protection, Northeast Normal University, Changchun, ChinaCollege of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong, ChinaState Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu, ChinaState Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu, ChinaRed mud (RM) a solid waste generated by the bauxite smelting industry, is a rich source of metal resources, especially Ti, and its recycling can bring significant environmental and economic benefits. In this study, precious metal Ti was efficiently recovered from red mud using a coupled acid leaching and boiling route for the effective separation of low-value metals. The red mud which contained mainly 10.69% Si, 12.1% Al, 15.2% Ca, 10.99% Fe, and 4.37% Ti, was recovered in five steps. First, a nitric acid solution was used to leach the metals in multiple stages, resulting in an acidic leach solution with high concentrations of Fe, Al, Ti, and Ca ions 2.7 g/L, 4.7 g/L, 5.43 g/L, and 1.8 g/L, respectively. Then, a small amount of sucrose was added as a catalyst to recover Ti from the leach solution under hydrothermal conditions, resulting in the targeted recovery of 98.6% of Ti in the form of high-purity anatase while Fe, Al, and Ca remained in the solution. Next, the Fe in solution was separated as hematite products at a temperature of 110°C and a reaction time of 4 h. Similarly, the Al in the solution was separated and precipitated as boehmite by heating it at 260°C for a reaction time of 20 h. Finally, the remaining Ca in solution was recovered by simple pH regulation. Economic accounting assessment showed that the method yields $101.06 for 1 t of red mud treated, excluding labor costs. This study provides a novel approach to recover precious metals from metal wastes through the whole process resource recovery of solid waste red mud.https://www.frontiersin.org/articles/10.3389/fchem.2023.1201390/fullred mudrecyclinganatasesucroseeconomic analysis |
| spellingShingle | Zhan Qu Jiancong Liu Ting Su Suiyi Zhu Junzhen Liu Yusen Chen Effective recovery of Ti as anatase nanoparticles from waste red mud via a coupled leaching and boiling route Frontiers in Chemistry red mud recycling anatase sucrose economic analysis |
| title | Effective recovery of Ti as anatase nanoparticles from waste red mud via a coupled leaching and boiling route |
| title_full | Effective recovery of Ti as anatase nanoparticles from waste red mud via a coupled leaching and boiling route |
| title_fullStr | Effective recovery of Ti as anatase nanoparticles from waste red mud via a coupled leaching and boiling route |
| title_full_unstemmed | Effective recovery of Ti as anatase nanoparticles from waste red mud via a coupled leaching and boiling route |
| title_short | Effective recovery of Ti as anatase nanoparticles from waste red mud via a coupled leaching and boiling route |
| title_sort | effective recovery of ti as anatase nanoparticles from waste red mud via a coupled leaching and boiling route |
| topic | red mud recycling anatase sucrose economic analysis |
| url | https://www.frontiersin.org/articles/10.3389/fchem.2023.1201390/full |
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