Prioritized recovery of lithium from spent lithium-ion batteries by synergistic roasting with Na2SO4: Precise regulation

IF 8.1 1区 工程技术 Q1 ENGINEERING, CHEMICAL Separation and Purification Technology Pub Date : 2024-12-16 DOI:10.1016/j.seppur.2024.131128
Shunlin Lei, Haoyuan Ding, Shuai Yuan, Guodong Wen, Chang Han, Zaizheng Dong, Wenzhe Wang
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Abstract

Due to its dual attributes of environment and resources, the development of green and low-carbon and the recycling of valuable metals have become a research hotspot in the field of spent lithium-ion batteries recycling. For the black mass, the reductant of Na2SO4 was selected to achieve efficient and preferential extraction of lithium by regulating the formation of the reduction products, investigating the mechanism of the synergy between in-situ carbothermal reduction and Na2SO4 roasting. The results demonstrated that the leaching efficiency of lithium from Black Mass was 80.93% under the optimal conditions of 20 g Na2SO4 dosage, roasting temperature of 700 ℃, and roasting time of 150 min. Comprehensive characterization revealed that the addition of Na2SO4 facilitated the transformation of Li from Li2CO3 to LiNaSO4, which has high solubility, and preventing the excessive reduction of Ni/Co oxides to the metallic states. The efficient separation and enrichment of lithium from spent LIBs was achieved by the accurate targeted transformation of the NCM during the synergistic roasting process, promising applications in the spent lithium-ion battery recycling industry.

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通过与 Na2SO4 协同焙烧从废锂离子电池中优先回收锂:精确调节
由于锂离子电池具有环境和资源双重属性,绿色低碳发展和有价金属回收利用已成为废旧锂离子电池回收利用领域的研究热点。针对黑质,选择Na2SO4作为还原剂,通过调节还原产物的形成实现锂的高效优先提取,研究了原位碳热还原与Na2SO4焙烧的协同作用机理。结果表明,在 Na2SO4 用量为 20 g、焙烧温度为 700 ℃、焙烧时间为 150 min 的最佳条件下,黑质锂的浸出效率为 80.93%。综合表征结果表明,Na2SO4 的加入促进了锂从 Li2CO3 向具有高溶解度的 LiNaSO4 的转化,并防止了镍/钴氧化物向金属态的过度还原。在协同焙烧过程中,通过对 NCM 进行精确的定向转化,实现了锂从废锂离子电池中的高效分离和富集,有望在废锂离子电池回收行业中得到应用。
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来源期刊
Separation and Purification Technology
Separation and Purification Technology 工程技术-工程:化工
CiteScore
14.00
自引率
12.80%
发文量
2347
审稿时长
43 days
期刊介绍: Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.
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