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Published on: November 10, 2014
Selective lithium extraction from spent lithium batteries: Mechanism and technology of (NH4)2SO4 synergistic roasting
Haoyuan Ding1, Shunlin Lei1, Shuai Yuan1
1College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, PR China; State Key Laboratory of Mineral Processing, Shenyang 110819, PR China; National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources, Shenyang 110819, PR China.
Abstract:
In the context of carbon peaking and carbon neutrality, sulfidation roasting has emerged as a significant focus in the recycling of spent lithium-ion batteries. (NH4)2SO4 was utilized as a reducing agent in the research for the selective extraction of Li from the anode and cathode mixtures. The formation of roasting products was modulated, and the synergistic effects of sulfates were investigated. The results revealed that the leaching rate of Li was up to 96.95 % when the ratio of the anode and cathode mixtures to (NH4)2SO4 was 1.2:1, the reduction temperature of 600 °C, and the reduction time of 120 min, and the Ni, Co, and Mn were entered into the slag phase. The economic feasibility of (NH4)2SO4 and Na2SO4 was evaluated, and the results showed that (NH4)2SO4 was the better choice. The Characterization results indicated that the Li in the anode and cathode mixtures was transformed to highly water-soluble Li sulfate by (NH4)2SO4, enhancing the leaching rate of Li. This study proposed an efficient and low sulphur emission process for the selective extraction of Li by sulfates synergistic roasting process, transforming Li from the anode and cathode mixtures into water-soluble sulfate.
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