摘要
以废旧锂电池正极材料为原料,采用硫酸铵焙烧-水浸工艺对其进行优先提锂。从硫酸铵加入量、焙烧温度、焙烧时间、水浸温度、水浸时间、水浸次数等条件进行实验探索,确定最优工艺条件。同时探讨原料成分对Li浸出率的影响以及补加碳粉对钴、镍、锰浸出的影响。结果表明:在硫酸铵加入量为理论值的1.05倍、焙烧温度600℃、焙烧时间1 h,水浸温度80℃、水浸时间1 h、液固体积质量比4∶1 mL/g、水浸次数2次时,Li的浸出率达到93.45%;原料中的Ni和C对Li的浸出有关键影响,Li的浸出率与原料中Ni质量分数呈正比关系,与C质量分数呈反比关系;补加少量碳粉可有效抑制钴、镍、锰的浸出,钴、镍、锰浸出最低可达到0.00%。
Lithium was preferentially extracted from cathode materials of spent lithium-ion batteries by ammonium sulfate roasti ng-water leaching process.The optimal process conditions were determined through independent experiments on ammonium sulfate addition,roasting temperature,roasting time,leaching temperature,leaching time and leaching times.Concurrently,the influence of the composition of raw materials on the leaching rate of Li and the influence of adding carbon powder on the leaching rate of cobalt,nickel and manganese were discussed.The results show that the leaching rate of Li reaches 93.45%undering the following processing conditions such as 1.05 times of the theoretical ammonium sulfate dosage,600℃roasting temperature,1 h roasting time,80℃leaching temperature,1 h leaching time,4∶1 mL/g liquid-solid volume mass ratio and twice leaching times.Moreover,the amount of Ni and C in the raw material has a key influence on the leaching of Li.Specifically,the leaching rate of Li is positively proportional to the mass fraction of Ni in the raw material,and inversely proportional to the mass fraction of C.Furthermore,adding a small amount of carbon powder can effectively inhibit the leaching of cobalt,nickel and manganese,and the leaching rate of cobalt,nickel and manganese can even reach 0.00%.
作者
吴洁
WU Jie(Central Academe,Shanghai Electric Group Co.,Ltd.,Shanghai 200070,China)
出处
《化学工程》
CAS
CSCD
北大核心
2023年第8期89-94,共6页
Chemical Engineering(China)
关键词
硫酸铵
焙烧
提锂
ammonium sulfate
roasting
extracting lithium
