氧化焙烧-循环浸出-沉淀法脱除废旧锂离子电池粉末中杂质元素
Removal of impurity elements from waste lithium-ion batteries powder by oxidation roasting,cyclic leaching,and precipitation method
张杜超 1李廷颖 1王豪 1陈霖 1王永密 1贾晓云1
作者信息
- 1. School of Metallurgy and Environment,Central South University,Changsha 410083,China
- 折叠
摘要
高效、清洁的回收废旧锂离子电池中有价金属是现在资源循环回收领域的热点,具有重大的经济效益和环保价值.本文提出了一种处理废旧锂离子电池的新方法,主要包括氧化焙烧、循环浸出和净化除杂三个步骤.第一步,在O2环境下对电池粉末进行脱碳处理(700℃,气体流速为240 mL/min,30 min),脱碳率为99%.第二步,以水合肼作为还原剂,在硫酸体系中,进行有价金属的浸出,在最佳条件(0.64 mol/L N2 H 4·H2 O、6 mol/L H2SO4、80℃、浸出液液固比5 mL/g、浸出时间120 min)下,锂、镍、钴、锰、铝和铜的浸出率均达90%.然后,以水合肼作为还原剂,通过循环浸出去除浸出液中的铜,得到在最佳条件(0.64 mol/L N2H4·H2O、浸出液液固比6 mL/g、80℃、浸出时间120 min)下,铜的沉淀率为96%,铜被还原成氧化亚铜进入沉淀渣中.第三步,以苯甲酸钠为沉淀剂,选择性沉淀浸出液中的铝,在最佳条件(苯甲酸钠实际与理论加入量之比为2、50℃、反应时间180 min)下,铝的沉淀率为96%,铝以苯甲酸铝的形式进入沉淀渣中,将苯甲酸铝溶于0.5 mol/L的Hcl,可实现苯甲酸的循环利用.
Abstract
In recent years,the efficient and clean recovery of valuable metals from waste lithium-ion batteries(LIBs)has become a hot spot in the field of resource recycling,which will produce significant environmental and economic benefits.This paper presents a treatment method for waste LIBs powder,including three stages,oxidation roasting,cyclic leaching and precipitation.In the First stage,the battery powder underwent a decarbonization process in an O2 atmosphere(700℃,gas flow rate 240 mL/min for 30 min),resulting in a decarbonization rate of 99%.In the second stage,valuable metals were leached in a sulfuric acid system with N2H4·H2O as reductant.Under optimal conditions(0.64 mol/L N2H4·H2O,6 mol/L H2SO4,80℃,5 mL/g,120 min),the leaching rates of Li,Ni,Co,Mn,Al,and Cu were all over 90%.Also,using N2H4·H2O as a reducing agent,Cu was removed from the leaching solution through cyclic leaching.Under the optimal conditions(0.64 mol/L N2H4·H2O,liquid-solid ratio is 6 mL/g,80℃,120 min),the precipitation rate of Cu was 96%,and Cu was reduced to Cu2O to enter the precipitated slag.Finally,C7H5NaO2 was used to selectively precipitate Al from the leaching solution,resulting in a precipitation rate of 96%.Al entered the precipitate in the form of Al(C7H5O2)3 which can be dissolved in dilute acid(0.5 mol/L HCL),allowing for benzoic acid to be recycled.
关键词
废旧锂离子电池回收/氧化焙烧/循环浸出/沉淀Key words
waste lithium-ion battery clean recovery/oxidation roasting/cyclic leaching/precipitation引用本文复制引用
基金项目
National Key Research and Development Program of China(2018YFC1901605)
出版年
2023
NETL
NSTL
维普
万方数据