摘要
提出废旧镍氢(Ni-MH)电池全金属可持续回收的方法,分别用硫酸钠溶液电解获得的H_(2)SO_(4)和NaOH溶液作为浸出剂和沉淀试剂。电极材料在温和条件下浸出,超过99%的稀土元素在pH1.0时以双硫酸盐的形式从溶液中沉淀,进而通过与NaOH反应转化为氢氧化物。在后续浸出液的纯化过程中,Al^(3+)和Fe^(3+)在pH 5.5时沉积,Zn^(2+)和Mn^(2+)用皂化D2EHPA-煤油从浸出液中萃取出来,形成两种具有工业价值的氢氧化物副产品。Ni^(2+)和Co^(2+)在pH9.5时沉淀,总回收率为97.5%。Na_(2)SO_(4)的总回收率达97%。这种金属回收方法可带来明显的经济效益,且闭环处理过程中无固体或液体废弃物。
A sustainable strategy for all-metal recycling from spent nickel metal hydride(Ni-MH)batteries was proposed,where H_(2)SO_(4) and NaOH solutions by the electrolysis of Na_(2)SO_(4) solution were used as the leaching agent and precipitation agent,respectively.The leaching of electrode materials was performed in mild condition,and more than 99% of the rare earths were firstly precipitated at pH 1.0 in the form of double sulphates,which were converted to hydroxides by reacting with NaOH.In the following purification steps,Al^(3+)and Fe^(3+)were deposited at pH 5.5,and Zn^(2+)and Mn^(2+)were extracted by saponified D2EHPA-kerosene from the leaching solution,and two hydroxide byproducts with industrial application were obtained.Ni^(2+)and Co^(2+)were precipitated at pH 9.5 with a total recovery rate of 97.5%.The recovery efficiency of Na_(2)SO_(4) was up to 97% in total.This metal recovery approach produces considerable economic profit,without solid or liquid waste in the closed-loop process.
作者
方加虎
何雨林
诸葛祥群
罗志虹
罗鲲
丁正平
刘晓腾
李义兵
Jia-hu FANG;Yu-lin HE;Xiang-qun ZHUGE;Zhi-hong LUO;Kun LUO;Zheng-ping DING;Xiao-teng LIU;Yi-bing LI(Changzhou Key Laboratory of Intelligent Manufacturing and Advanced Technology for Power Battery,School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China;Key Laboratory of New Processing Technology for Nonferrous Metal&Materials,Ministry of Education,Guilin University of Technology,Guilin 541004,China)
基金
the financial support from the National Natural Science Foundation of China(Nos.51874051,52111530139)
the Science and Technology Plan Project of Changzhou,China(No.CQ20D2EHPA034)
the Guangxi Natural Science Foundation,China(Nos.2018GXNSFAA281184,2019GXNSFAA245046)
Key Laboratory of New Processing Technology for Nonferrous Metal&Materials,Ministry of Education,China(No.20KF-4,20AA-18)。
关键词
废旧镍氢电池
金属回收
电解
硫酸钠
闭环过程
spent Ni-MH batteries
metal recovery
electrolysis
sodium sulfate
closed-loop process
