Study on the Synergistic Extraction of Lithium from Spent Lithium Cobalt Oxide Batteries by Molten Salt Electrolysis and Two-Step Precipitation Method
With the continuous development of society, the number of spent lithium-ion batteries has also increased, and the recovery of valuable metals such as Ni, Co, and Li has become the main research direction of many scholars. In this paper, the extraction process of lithium that enters the molten salt a...
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MDPI AG
2021-09-01
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| author | Hui Li Haotian Li Jinglong Liang Hongyan Yan Zongying Cai |
| author_facet | Hui Li Haotian Li Jinglong Liang Hongyan Yan Zongying Cai |
| author_sort | Hui Li |
| collection | DOAJ |
| description | With the continuous development of society, the number of spent lithium-ion batteries has also increased, and the recovery of valuable metals such as Ni, Co, and Li has become the main research direction of many scholars. In this paper, the extraction process of lithium that enters the molten salt after LiCoO<sub>2</sub> electrolysis is studied. Oxalic acid and phosphate are added to molten salt containing lithium ions to realize the two-part precipitation method to extract lithium. The influence of pH value, temperature, reaction time, and oxalic acid (or phosphate) addition on the process of oxalic acid calcium removal and phosphate lithium precipitation is analyzed. The results show that the calcium removal rate of oxalic acid has reached 99.72% (Initial conditions: PH = 7.0, <i>T</i> = 70 °C, <i>t</i> = 1.5 h, <i>n</i>(H<sub>2</sub>C<sub>2</sub>O<sub>4</sub>):<i>n</i>(Ca<sup>2+</sup>) = 1.2:1). The precipitation of Li<sub>3</sub>PO<sub>4</sub> obtained in the phosphate extraction experiment of lithium is as high as 88.44% (Initial conditions: PH = 8.0, <i>T</i> = 70 °C, <i>t</i> = 1.5 h, <i>n</i>(actual dosage of Na<sub>3</sub>PO<sub>4</sub>):<i>n</i>(theoretical dosage of Na<sub>3</sub>PO<sub>4</sub>) = 1.2:1). The obtained lithium phosphate crystals show regular spherical particles, which can be seen by SEM. |
| first_indexed | 2024-03-10T06:38:22Z |
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| language | English |
| last_indexed | 2024-03-10T06:38:22Z |
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| series | Crystals |
| spelling | doaj.art-35c3417537cf4c28ae1385a250f9a3ca2023-11-22T17:52:37ZengMDPI AGCrystals2073-43522021-09-011110116310.3390/cryst11101163Study on the Synergistic Extraction of Lithium from Spent Lithium Cobalt Oxide Batteries by Molten Salt Electrolysis and Two-Step Precipitation MethodHui Li0Haotian Li1Jinglong Liang2Hongyan Yan3Zongying Cai4College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, ChinaCollege of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, ChinaCollege of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, ChinaCollege of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, ChinaCollege of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, ChinaWith the continuous development of society, the number of spent lithium-ion batteries has also increased, and the recovery of valuable metals such as Ni, Co, and Li has become the main research direction of many scholars. In this paper, the extraction process of lithium that enters the molten salt after LiCoO<sub>2</sub> electrolysis is studied. Oxalic acid and phosphate are added to molten salt containing lithium ions to realize the two-part precipitation method to extract lithium. The influence of pH value, temperature, reaction time, and oxalic acid (or phosphate) addition on the process of oxalic acid calcium removal and phosphate lithium precipitation is analyzed. The results show that the calcium removal rate of oxalic acid has reached 99.72% (Initial conditions: PH = 7.0, <i>T</i> = 70 °C, <i>t</i> = 1.5 h, <i>n</i>(H<sub>2</sub>C<sub>2</sub>O<sub>4</sub>):<i>n</i>(Ca<sup>2+</sup>) = 1.2:1). The precipitation of Li<sub>3</sub>PO<sub>4</sub> obtained in the phosphate extraction experiment of lithium is as high as 88.44% (Initial conditions: PH = 8.0, <i>T</i> = 70 °C, <i>t</i> = 1.5 h, <i>n</i>(actual dosage of Na<sub>3</sub>PO<sub>4</sub>):<i>n</i>(theoretical dosage of Na<sub>3</sub>PO<sub>4</sub>) = 1.2:1). The obtained lithium phosphate crystals show regular spherical particles, which can be seen by SEM.https://www.mdpi.com/2073-4352/11/10/1163lithium cobalt oxide batterymolten salt electrolysisoxalate removal of calciumphosphoric acid to de-deposit lithium |
| spellingShingle | Hui Li Haotian Li Jinglong Liang Hongyan Yan Zongying Cai Study on the Synergistic Extraction of Lithium from Spent Lithium Cobalt Oxide Batteries by Molten Salt Electrolysis and Two-Step Precipitation Method Crystals lithium cobalt oxide battery molten salt electrolysis oxalate removal of calcium phosphoric acid to de-deposit lithium |
| title | Study on the Synergistic Extraction of Lithium from Spent Lithium Cobalt Oxide Batteries by Molten Salt Electrolysis and Two-Step Precipitation Method |
| title_full | Study on the Synergistic Extraction of Lithium from Spent Lithium Cobalt Oxide Batteries by Molten Salt Electrolysis and Two-Step Precipitation Method |
| title_fullStr | Study on the Synergistic Extraction of Lithium from Spent Lithium Cobalt Oxide Batteries by Molten Salt Electrolysis and Two-Step Precipitation Method |
| title_full_unstemmed | Study on the Synergistic Extraction of Lithium from Spent Lithium Cobalt Oxide Batteries by Molten Salt Electrolysis and Two-Step Precipitation Method |
| title_short | Study on the Synergistic Extraction of Lithium from Spent Lithium Cobalt Oxide Batteries by Molten Salt Electrolysis and Two-Step Precipitation Method |
| title_sort | study on the synergistic extraction of lithium from spent lithium cobalt oxide batteries by molten salt electrolysis and two step precipitation method |
| topic | lithium cobalt oxide battery molten salt electrolysis oxalate removal of calcium phosphoric acid to de-deposit lithium |
| url | https://www.mdpi.com/2073-4352/11/10/1163 |
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