Two-phase conversion process of ethylene glycol and the mechanism of synergistic extraction of lithium in subcritical water system

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management Pub Date : 2025-04-03 DOI:10.1016/j.wasman.2025.114776

Yayun Ma , Bei Wang , Xiaojian Liu , Xiangyang Zhou , Juan Yang , Jingjing Tang , Yaguang Zhang , Junqiang Zhu , Zhongbing Wang , Fanyun Su , Jinyue Ge

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Abstract

The efficient recovery of lithium in spent lithium-ion batteries (LIBs) is of key significance to alleviate the resource utilization of lithium in solid waste. Herein, a ethylene glycol (EG) assisted subcritical method is proposed for the selective recovery of lithium. Under the optimal conditions with reaction temperature of 270℃, reaction time of 3 h, rotational speed of 300 r min⁻¹, L/S ratio of 10:1 mL g⁻¹, and EG dosage of 60 %, lithium can be leached with efficiencies of up to 98.4 % while the transition metals remain in the residue phase as oxides (NiO and CoO) or carbonate (MnCO₃). The subcritical lithium extraction mechanism indicates that the hydroxyl functional group of EG and the pyrolysis gas played a synergistic role in reducing the cathode powder. The EG-assisted subcritical lithium extraction system greatly improves the recovery efficiency of lithium under more environmentally friendly conditions, and lays a good foundation for the subsequent low-acid leaching of lithium extraction residue. This process provides a novel approach to the green and selective recycling process of spent LIBs.

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来源期刊

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)