废旧磷酸铁锂正极粉锂的选择性浸出工艺研究

王威; 柳林; 刘红召; 王洪亮; 曹耀华; 马驰

doi:10.3969/j.issn.1000-6532.2023.05.010

废旧磷酸铁锂正极粉锂的选择性浸出工艺研究

中国地质科学院郑州矿产综合利用研究所，国家非金属矿资源综合利用工程技术研究中心，自然资源部多金属矿综合利用评价重点实验室，河南省黄金资源综合利用重点实验室，河南　郑州　450006

基金项目: 中国地质调查局地质大调查项目（DD20221698）

详细信息

作者简介: 王威（ 1983-），男，副研究员，主要从事矿产综合利用研究工作

通讯作者: 马驰（1981-），男，高级工程师，主要从事矿石工艺矿物学研究

中图分类号: TD985；TF843

收稿日期: 2022-09-26

刊出日期: 2023-10-25

Selective Leaching Process of Waste Lithium Iron Phosphate Cathode Powder

Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, China National Engineering Research Center for Utilization of Industrial Minerals, Key Laboratory for Polymetallic Ores’ Evaluation and Utilization, MNR, Comprehensive Utilization Key Laboratory of Gold Resource in Henan Province, Zhengzhou, Henan, China

More Information

Corresponding author: Ma Chi, machi-111@163.com

Received Date: 26 September 2022

Publish Date: 25 October 2023

摘要

摘要:
这是一篇冶金工程领域的论文。以废旧磷酸铁锂电池正极粉为对象，开展了以Na₂S₂O₈作为氧化剂，并添加低浓度乙酸作为浸出剂选择性浸锂的研究，考查了Na₂S₂O₈加入量、乙酸浓度、浸出温度、浸出液固比和浸出时间等对锂选择性浸出影响。在乙酸浓度0.3 mol/L、Na₂S₂O₈加入量为理论量的1.1倍，浸出液固比10 mL/g、室温浸出2 h条件下，锂、铁、磷的浸出率分别为98.05%、4.49%和2.46%。
- 冶金工程 /
- 磷酸铁锂电池 /
- 选择性浸锂 /
- 过硫酸钠 /
- 乙酸
Abstract:
This is an essay in the field of metallurgical engineering. Using waste lithium iron phosphate battery cathode powder as raw material, a study on lithium selective leaching with Na₂S₂O₈ as oxidant and low concentration acetic acid as aleaching agent was carried out. The effects of Na₂S₂O₈ addition, acetic acid concentration, leaching temperature, leaching liquid-solid ratio and leaching time on selective leaching of lithium were investigated. At the conditions of acetic acid concentration of 0.3 mol/L, Na₂S₂O8 addition of 1.1 times the theoretical amount, L/S ratio of 10 mL /g and room temperature leaching for 2 h, the leaching rates of lithium, iron and phosphorus were 98.05%, 4.49% and 2.46% respectively.
- Metallurgical engineering /
- Lithium iron phosphate batteries /
- Lithium selective leaching /
- Sodium persulfate /
- Acetic acid

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图 1 锂电池磷酸铁锂正极粉XRD

Figure 1.

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图 2 过硫酸钠加入量对锂、铁、磷浸出率的影响

Figure 2.

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图 3 乙酸加入量对锂、铁、磷浸出率的影响

Figure 3.

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图 4 浸出液固比对锂、铁、磷浸出率的影响

Figure 4.

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图 5 浸出时间对锂、铁、磷浸出率的影响

Figure 5.

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图 6 浸出温度对锂、铁、磷浸出率的影响

Figure 6.

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表 1 磷酸铁锂正极粉光谱半定量分析/%

Table 1. Semi-quantitative analysis results of lithium iron phosphate cathode powder

F	Na₂O	MgO	Al₂O₃	SiO₂	P₂O₅	SO₃	Fe₂O₃	NiO
1.18	0.058	0.048	0.523	0.096	46.0	0.092	51.6	0.011

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表 2 磷酸铁锂正极粉主要化学元素含量/%

Table 2. Main chemical contents of lithium iron phosphate cathode powder

Li	Fe	P	Al
3.88	34.21	18.13	0.33

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表 3 较佳条件验证实验结果

Table 3. Validation test results under optimal conditions

实验次数	浸出率/%			浸出液中含量/（g/L）
实验次数	Li	Fe	P	Li	Fe	P
1	98.02	4.50	2.47	3.79	1.54	0.43
2	98.27	4.63	2.52	3.81	1.57	0.44
3	98.05	4.31	2.44	3.80	1.45	0.43
4	97.84	4.52	2.42	3.70	1.55	0.43
平均值	98.05	4.49	2.46	3.78	1.53	0.43

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