Improved Process for Separating TiO<sub>2</sub> from an Oxalic-Acid Hydrothermal Leachate of Vanadium Slag
In the present study, a process of separating high-quality TiO<sub>2</sub> from an oxalic-acid leachate of vanadium slag was proposed. It consists of two steps; oxalic acid was firstly recovered from the leachate by the cooling-crystallization method, and subsequently TiO<sub>2<...
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MDPI AG
2022-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/1/20 |
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| author | Qingdong Miao Ming Li Guanjin Gao Wenbo Zhang Jie Zhang Baijun Yan |
| author_facet | Qingdong Miao Ming Li Guanjin Gao Wenbo Zhang Jie Zhang Baijun Yan |
| author_sort | Qingdong Miao |
| collection | DOAJ |
| description | In the present study, a process of separating high-quality TiO<sub>2</sub> from an oxalic-acid leachate of vanadium slag was proposed. It consists of two steps; oxalic acid was firstly recovered from the leachate by the cooling-crystallization method, and subsequently TiO<sub>2</sub> was separated from the oxalic-acid recovered leachate by the hydrothermal precipitation method. The experimental results indicate that oxalic acid can be recovered from the leachate by cooling crystallization at 5 °C, and after the recovery of oxalic acid, the purity of final TiO<sub>2</sub> product can also be improved. For example, when the leachate was cooled directly at 5 °C for 5 h, about 7% of oxalic acid was recovered, and the purity of final TiO<sub>2</sub> product improved from 95.7% to 96.6%. Furthermore, it was found that when some HCl solution was added to the leachate, both the recovery percentage of oxalic acid and the purity of TiO<sub>2</sub> product increased. For instance, when 15 vol% of HCl solution relative to pregnant leachate was added, about 35% oxalic acid was recovered by cooling crystallization at 5 °C for 3 h, and the anatase TiO<sub>2</sub> product with a purity of 99.2% was obtained by hydrothermal precipitation at 140 °C for 2.5 h. |
| first_indexed | 2024-03-09T11:42:26Z |
| format | Article |
| id | doaj.art-566f89bef03642a79056206edbbaf3cd |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T11:42:26Z |
| publishDate | 2022-12-01 |
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| series | Metals |
| spelling | doaj.art-566f89bef03642a79056206edbbaf3cd2023-11-30T23:29:35ZengMDPI AGMetals2075-47012022-12-011312010.3390/met13010020Improved Process for Separating TiO<sub>2</sub> from an Oxalic-Acid Hydrothermal Leachate of Vanadium SlagQingdong Miao0Ming Li1Guanjin Gao2Wenbo Zhang3Jie Zhang4Baijun Yan5State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, ChinaState Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, ChinaState Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, ChinaState Key Laboratory of Advanced Metallurgy, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, Beijing 100083, ChinaIn the present study, a process of separating high-quality TiO<sub>2</sub> from an oxalic-acid leachate of vanadium slag was proposed. It consists of two steps; oxalic acid was firstly recovered from the leachate by the cooling-crystallization method, and subsequently TiO<sub>2</sub> was separated from the oxalic-acid recovered leachate by the hydrothermal precipitation method. The experimental results indicate that oxalic acid can be recovered from the leachate by cooling crystallization at 5 °C, and after the recovery of oxalic acid, the purity of final TiO<sub>2</sub> product can also be improved. For example, when the leachate was cooled directly at 5 °C for 5 h, about 7% of oxalic acid was recovered, and the purity of final TiO<sub>2</sub> product improved from 95.7% to 96.6%. Furthermore, it was found that when some HCl solution was added to the leachate, both the recovery percentage of oxalic acid and the purity of TiO<sub>2</sub> product increased. For instance, when 15 vol% of HCl solution relative to pregnant leachate was added, about 35% oxalic acid was recovered by cooling crystallization at 5 °C for 3 h, and the anatase TiO<sub>2</sub> product with a purity of 99.2% was obtained by hydrothermal precipitation at 140 °C for 2.5 h.https://www.mdpi.com/2075-4701/13/1/20TiO<sub>2</sub>hydrothermal separationoxalic-acid leachatecooling crystallization |
| spellingShingle | Qingdong Miao Ming Li Guanjin Gao Wenbo Zhang Jie Zhang Baijun Yan Improved Process for Separating TiO<sub>2</sub> from an Oxalic-Acid Hydrothermal Leachate of Vanadium Slag Metals TiO<sub>2</sub> hydrothermal separation oxalic-acid leachate cooling crystallization |
| title | Improved Process for Separating TiO<sub>2</sub> from an Oxalic-Acid Hydrothermal Leachate of Vanadium Slag |
| title_full | Improved Process for Separating TiO<sub>2</sub> from an Oxalic-Acid Hydrothermal Leachate of Vanadium Slag |
| title_fullStr | Improved Process for Separating TiO<sub>2</sub> from an Oxalic-Acid Hydrothermal Leachate of Vanadium Slag |
| title_full_unstemmed | Improved Process for Separating TiO<sub>2</sub> from an Oxalic-Acid Hydrothermal Leachate of Vanadium Slag |
| title_short | Improved Process for Separating TiO<sub>2</sub> from an Oxalic-Acid Hydrothermal Leachate of Vanadium Slag |
| title_sort | improved process for separating tio sub 2 sub from an oxalic acid hydrothermal leachate of vanadium slag |
| topic | TiO<sub>2</sub> hydrothermal separation oxalic-acid leachate cooling crystallization |
| url | https://www.mdpi.com/2075-4701/13/1/20 |
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