标题: A reagent closed loop for recovering lithium from spent LiFePO<sub>4</sub> by oxygen-Na<sub>2</sub>SO<sub>4</sub> co-assisted roasting
作者: Wang, DF (Wang, Danfeng); Wang, HY (Wang, Hongya); Zhou, FY (Zhou, Fengyin); Qu, X (Qu, Xin); Cai, YQ (Cai, Yuqi); Wang, DH (Wang, Dihua); Yin, HY (Yin, Huayi)
来源出版物: SEPARATION AND PURIFICATION TECHNOLOGY 卷: 379 文献号: 134858 DOI: 10.1016/j.seppur.2025.134858 Early Access Date: AUG 2025 Published Date: 2025 DEC 31 子辑: 1
摘要: The process of recovering spent LiFePO4 (LFP) usually demands to oxidize Fe (II) to Fe (III) using oxidants, leach Li using acids or salts, and precipitate Li2CO3 using Na2CO3, which consumes enormous amounts of agents, produces waste acid solutions, and generates salt by-products. Herein, we propose an oxygen-Na2SO4 co-assisted roasting method to convert LiFePO4 to NaFePO4 and Li2CO3, where oxygen from air functions as the oxidant, Na2SO4 is circulated, and all elements (Li, Fe, P) are recycled. First, O2 oxidizes the LFP to Li3Fe2(PO4)3 and Fe2O3 at 600 degrees C, and simultaneously Na2SO4 captures Li from the Li3Na2(PO4)3 and generates Na3Fe2(PO4)3 and LiNaSO4 within 5 min. Second, 99.07 % Li is dissolved in water without using acids, and is recovered as Li2CO3 by adding Na2CO3. After that, the Na2SO4 byproduct can be utilized in the roasting procedure again. At last, the obtained Na3Fe2(PO4)3 and Fe2O3 are applied to synthesize NaFePO4, thereby all elements are recovered. Moreover, the economic and environmental analysis considers that this technique can reduce energy consumption and greenhouse gas emission and yield substantial revenue, establishing a reagent closed loop to reclaim LFP with generating minimized secondary wastes.
作者关键词: Sodium sulfate; Roasting; Co-assisted; spent LiFePO(4)battery
KeyWords Plus: BATTERIES
地址: [Wang, Danfeng; Wang, Hongya; Zhou, Fengyin; Qu, Xin; Cai, Yuqi; Wang, Dihua; Yin, Huayi] Wuhan Univ, Sch Resource & Environm Sci, 299 Bayi Rd, Wuhan 430072, Peoples R China.
[Wang, Danfeng; Wang, Hongya; Zhou, Fengyin; Qu, Xin; Cai, Yuqi; Wang, Dihua; Yin, Huayi] Wuhan Univ, Joint Ctr Green Mfg Energy Storage Mat, Wuhan 430072, Peoples R China.
[Wang, Danfeng; Wang, Hongya; Zhou, Fengyin; Qu, Xin; Cai, Yuqi; Wang, Dihua; Yin, Huayi] Chilwee, Wuhan 430072, Peoples R China.
[Wang, Dihua; Yin, Huayi] Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.
通讯作者地址: Yin, HY (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, 299 Bayi Rd, Wuhan 430072, Peoples R China.
电子邮件地址: [email protected]
影响因子：9
