Separation of Co and Mn from acetic acid leaching solution of spent lithium-ion battery by Cyanex272

IF 7.4 2区 工程技术 Q1 ENGINEERING, CHEMICAL
Kun Wang , Guoquan Zhang , Mingzhi Luo , Miao Zeng
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引用次数: 11

Abstract

Spent lithium-ion batteries (LIBs) contain large amounts of scarce metals, such as Li, Co, Al, Ni, and Mn, and are precious secondary resources. The leaching of spent LIBs using organic acids is considered to be an effective and feasible method for recovering these metals. However, the separation of Li, Co, Ni, and Mn in a solution is difficult to achieve. Using an extractant consisting of 15 % Cyanex272, 10 % tributyl phosphate, and 75 % sulfonated kerosene (v/v) and an organic to aqueous phase ratio of 1:1, over 90.13 % of Al, 95.72 % of Co, and 98.93 % of Mn were extracted. Only 2.05 % of Li and 2.68 % of Ni were co-extracted. The slope method and infrared spectra analysis showed that the extraction processes of Al, Co, and Mn with Cyanex272 follow cationic exchange mechanisms; the acetate anions introduced during the leaching participated in the extraction mechanism of Co. The thermodynamic parameters of Gibb’s free energy, enthalpy change, and entropy change for the extraction reactions were all lower than zero, indicating that the extraction reactions are exothermic and spontaneous and increase the disorder. After washing with NH4HSO4 1 M, most of the Co and Mn were removed, and a negligible amount of Al was lost. By adding 2.5 times the stoichiometric amount of (NH4)2S2O8 to the washing solution and heating at 363.15 K for 40 min, 99.3 % of the Mn was precipitated as MnO2 with a purity of 96.73 %. After removing Mn, Co2+ was precipitated as CoC2O4·2 H2O using anhydrous oxalic acid; Co3O4 with a purity of 98.13 % was subsequently obtained by calcination. This study demonstrates the potential of hydrometallurgical processes for the treatment of spent LIBs and provides insights into strategies for the utilization of secondary resources.

用Cyanex272分离废锂离子电池乙酸浸出液中的Co和Mn
废旧锂离子电池(LIBs)中含有大量的Li、Co、Al、Ni、Mn等稀有金属,是珍贵的二次资源。有机酸浸出废lib被认为是回收这些金属的一种有效可行的方法。然而,在溶液中分离Li, Co, Ni和Mn是很难实现的。采用15%氰ex272、10%磷酸三丁酯和75%磺化煤油(v/v)组成的萃取剂,有机水相比为1:1,可萃取出90.13%的Al、95.72%的Co和98.93%的Mn。共萃取的Li和Ni分别为2.05%和2.68%。斜率法和红外光谱分析表明,Cyanex272萃取Al、Co和Mn的过程遵循阳离子交换机制;浸出过程中引入的乙酸阴离子参与了Co的萃取机理。萃取反应的吉布自由能、焓变、熵变等热力学参数均小于零,说明萃取反应是放热自发的,无序性增加。用nh4hso1 M洗涤后,Co和Mn大部分被去除,Al的损失可以忽略不计。在洗涤液中加入2.5倍化学计量量的(NH4)2S2O8,在363.15 K下加热40 min,可析出99.3%的Mn为MnO2,纯度为96.73%。去除Mn后,用无水草酸将Co2+沉淀为CoC2O4·2h2o;焙烧制得纯度为98.13%的Co3O4。这项研究证明了湿法冶金工艺处理废lib的潜力,并为二次资源的利用策略提供了见解。
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来源期刊
Journal of Environmental Chemical Engineering
Journal of Environmental Chemical Engineering Environmental Science-Pollution
CiteScore
11.40
自引率
6.50%
发文量
2017
审稿时长
27 days
期刊介绍: The Journal of Environmental Chemical Engineering (JECE) serves as a platform for the dissemination of original and innovative research focusing on the advancement of environmentally-friendly, sustainable technologies. JECE emphasizes the transition towards a carbon-neutral circular economy and a self-sufficient bio-based economy. Topics covered include soil, water, wastewater, and air decontamination; pollution monitoring, prevention, and control; advanced analytics, sensors, impact and risk assessment methodologies in environmental chemical engineering; resource recovery (water, nutrients, materials, energy); industrial ecology; valorization of waste streams; waste management (including e-waste); climate-water-energy-food nexus; novel materials for environmental, chemical, and energy applications; sustainability and environmental safety; water digitalization, water data science, and machine learning; process integration and intensification; recent developments in green chemistry for synthesis, catalysis, and energy; and original research on contaminants of emerging concern, persistent chemicals, and priority substances, including microplastics, nanoplastics, nanomaterials, micropollutants, antimicrobial resistance genes, and emerging pathogens (viruses, bacteria, parasites) of environmental significance.
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