退役锂离子电池沉锂母液的双极膜电渗析脱盐  

Desalination of mother liquor generated in lithium carbonate precipitation of retired lithium-ion battery by bipolar membrane electrodialysis

作　　者：胡健 刘水发 吴娜 谭飞 魏艳芳 肖培南 HU Jian;LIU Shuifa;WU Na;TAN Fei;WEI Yanfang;XIAO Peinan(Jiangxi Ruida New Energy Technology Co.Ltd.,Yichun 336110,China;School of Metallurgical and Materials Engineering,Chongqing University of Science and Technology,Chongqing 401331,China)

机构地区：[1]江西睿达新能源科技有限公司,江西宜春336110 [2]重庆科技学院冶金与材料工程学院,重庆401331

出　　处：《化工环保》2023年第2期228-233,共6页Environmental Protection of Chemical Industry

基　　金：重庆科技学院研究生科技创新计划项目(YKJCX2120217)。

摘　　要：采用双极膜电渗析工艺处理退役锂离子电池正极材料湿法处理产生的沉锂母液(经预处理降低COD),考察了初始酸碱浓度、电流密度和沉锂母液pH对产酸碱电流效率和能耗的影响。实验结果表明:随着酸室和碱室初始酸碱浓度的增加,产酸碱电流效率降低,能耗增加;增大电流密度或沉锂母液pH,可提高产酸碱电流效率并降低能耗;在初始酸碱浓度为0.10 mol/L、电流密度为23.75 mA/cm^(2)、沉锂母液pH为9.0的条件下,产酸和碱的电流效率分别为52.53%和62.12%,能耗分别为8.68 kW·h/kg和8.99 kW·h/kg。该方法可将沉锂母液中的硫酸钠转化为氢氧化钠和硫酸,实现沉锂母液的脱盐处理和资源化高效利用。Bipolar membrane electrodialysis was used to deal with the lithium precipitation mother liquor generated in treatment of the anode material in retired lithium-ion battery by hydrometallurgy process(The COD of the mother liquor was reduced earlier by pretreatment).The effects of initial acid and alkali concentration,current density and pH of the mother liquor on current efficiency and energy consumption for acid and alkali production were investigated.The results derived from the experiments are as follows:The increase of initial concentration of acid and alkali in acid and alkali collection chamber will lead to the decrease of current efficiency and the increase of energy consumption;While the increase of current density and pH of the mother liquor will lead to the increase of current efficiency and the decrease of energy consumption;Under the conditions of initial acid and alkali concentration 0.10 mol/L,current density 23.75 mA/cm^(2)and pH of the f mother liquor 9,the current efficiency of acid and alkali production is 52.53%and 62.12%,respectively,and the energy consumption is 8.68 kW·h/kg and 8.99 kW·h/kg,respectively.This method can convert sodium sulfate in the lithium precipitation mother liquor into sodium hydroxide and sulfuric acid,then the desalination and resource utilization of the mother liquor can be realized.

关 键 词：锂离子电池 正极材料 沉锂母液 双极膜电渗析 脱盐 

分 类 号：X773[环境科学与工程—环境工程]