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| Selective Extraction of Lithium by Roasting-Water Assisted Leaching from Waste Ternary Cathode Materials |
| Received:September 18, 2020 Revised:October 10, 2020 |
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| DOI：doi：10.3969/j.issn.1007-7545.2021.01.004 |
| KeyWord:waste ternary cathode materials; lithium; recovery; roasting; leaching; selectivity |
| Author | Institution |
| WEN Xiao-qiang |
赣州有色冶金研究所 |
| GUO Chun-ping |
赣州有色冶金研究所 |
| ZHOU You-chi |
赣州有色冶金研究所 |
| LAI Hua-sheng |
赣州有色冶金研究所 |
| LIU Wen-wen |
赣州有色冶金研究所 |
| CHEN Yan-fei |
赣州有色冶金研究所 |
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| Abstract: |
| To address long process flow, high acid and alkali consumption, low direct lithium yield and high recycling cost in present recycling process of waste ternary cathode materials, a novel process to selectively extract lithium from waste ternary cathode materials by roasting and water leaching and efficiently separation with other metals (nickel, cobalt, manganese) was proposed. Recovery rate of lithium rises significantly by adding A(inorganic acid) and B(inorganic acid salt) as additives at low temperature calcination and then water leaching. Effects of calcination temperature, mass ratio of auxiliary agent and cathode materials, and leachate solid ratio on leaching rate of metals were studied. The results show that leaching rate of Li is 95% above under the conditions including calcination temperature of 600 ℃, mass ratio of A and B to cathode material of 10︰1︰20, calcination time of 2 h, and L/S of 3 mL/g. Concentration of Li+ in leachate is 21 g/L above, and content of other metals (Ni, Co, Mn) is less than 1 mg/L. |
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