LiFePO4-Na2CO3体系焙烧过程物相变化及Li、Fe回收研究

TG450.40; LiFePO4作为正极材料在电动汽车动力电池中获得广泛使用,报废后再利用理论和工艺是当前研究的热点问题.提出了一种采用碱性焙烧联合酸性浸出从LiFePO4中提取Li、Fe的新型回收方法,并对LiFePO4-Na2CO3体系焙烧过程中的物相变化进行了研究.结果表明:LiFePO4-Na2CO3作用体系以质量比1∶0.67混合在800～950 ℃焙烧,过程是包含化合物分解反应、氧化反应及化合物生成反应等反应类型的复杂反应,焙烧产物的物相组成为Fe2O3、Fe3O4、NaLi2PO4、LiNa5(PO4)2.浸出液使用磷酸溶液(pH=0)、浸出温度50 ℃、浸出时间60 min、...

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Published in	有色金属工程 Vol. 14; no. 4; pp. 90 - 96
Main Authors	贾鹏升, 王大辉, 陈怀敬, 祁万虎, 武国真
Format	Journal Article
Language	Chinese
Published	兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州 730050%兰州理工大学理学院,兰州 730050 2024
Subjects	焙烧 metal recovery LiFePO4 物相变化 spent lithium-ion power batteries roasting phase transformation 废旧锂离子动力电池金属回收
Online Access	Get full text
ISSN	2095-1744
DOI	10.3969/j.issn.2095-1744.2024.04.012

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Abstract	TG450.40; LiFePO4作为正极材料在电动汽车动力电池中获得广泛使用,报废后再利用理论和工艺是当前研究的热点问题.提出了一种采用碱性焙烧联合酸性浸出从LiFePO4中提取Li、Fe的新型回收方法,并对LiFePO4-Na2CO3体系焙烧过程中的物相变化进行了研究.结果表明:LiFePO4-Na2CO3作用体系以质量比1∶0.67混合在800～950 ℃焙烧,过程是包含化合物分解反应、氧化反应及化合物生成反应等反应类型的复杂反应,焙烧产物的物相组成为Fe2O3、Fe3O4、NaLi2PO4、LiNa5(PO4)2.浸出液使用磷酸溶液(pH=0)、浸出温度50 ℃、浸出时间60 min、液固比为20mL/g,并用磷酸控制浸出终止pH=1的条件下,焙烧产物中Li的浸出率均大于98％,Fe的浸出率低于9％.
AbstractList	TG450.40; LiFePO4作为正极材料在电动汽车动力电池中获得广泛使用,报废后再利用理论和工艺是当前研究的热点问题.提出了一种采用碱性焙烧联合酸性浸出从LiFePO4中提取Li、Fe的新型回收方法,并对LiFePO4-Na2CO3体系焙烧过程中的物相变化进行了研究.结果表明:LiFePO4-Na2CO3作用体系以质量比1∶0.67混合在800～950 ℃焙烧,过程是包含化合物分解反应、氧化反应及化合物生成反应等反应类型的复杂反应,焙烧产物的物相组成为Fe2O3、Fe3O4、NaLi2PO4、LiNa5(PO4)2.浸出液使用磷酸溶液(pH=0)、浸出温度50 ℃、浸出时间60 min、液固比为20mL/g,并用磷酸控制浸出终止pH=1的条件下,焙烧产物中Li的浸出率均大于98％,Fe的浸出率低于9％.
Abstract_FL	LiFePO4 is widely used as a positive electrode material in electric vehicle power batteries,and its recycling theory and process after scrapping are currently a hot research topic.This paper proposes a new recovery method for extracting Li and Fe from LiFePO4 using alkaline roasting combined with acidic leaching,and studies the phase transformation during the roasting process of the Na2CO3-LiFePO4 system.The results showed that the Na2CO3-LiFePO4 reaction system was mixed at a mass ratio of 1∶0.67 and calcined at 800～950 C.The process was a complex reaction involving compound chemical decomposition,oxidation reaction and compound formation reaction.The phase composition of the calcined product was Fe2O3,Fe3O4,NaLi2 PO4,LiNa5(PO4)2.Under the conditions of using phosphoric acid solution(pH=0),leaching temperature of 50 C,leaching time of 60 minutes,and liquid-solid ratio of 20 mL/g,and using phosphoric acid to control the leaching termination pH=1,the leaching rate of Li in the calcined products is greater than 98％,while the leaching rate of Fe is less than 9％.
Author	王大辉贾鹏升陈怀敬武国真祁万虎
AuthorAffiliation	兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州 730050%兰州理工大学理学院,兰州 730050
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Author_FL	WANG Dahui QI Wanhu JIA Pengsheng WU Guozhen CHEN Huaijing
Author_FL_xml	– sequence: 1 fullname: JIA Pengsheng – sequence: 2 fullname: WANG Dahui – sequence: 3 fullname: CHEN Huaijing – sequence: 4 fullname: QI Wanhu – sequence: 5 fullname: WU Guozhen
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