废旧氢镍电池负极材料中稀土的资源化利用

The utilization of rare earth from waste hydrogen-nickel battery cathode materials

  • 摘要: 设计了综合回收氢镍电池负极材料中稀土元素并同时回收镍、钴的湿法冶金流程.该流程回收的主要步骤包括:硫酸浸出负极,使大部分稀土以硫酸稀土的形式与镍、钴分离,硫酸稀土经碱转化为氢氧化稀土;进入浸出液的稀土,用P507+煤油萃取使其与镍、钴分离,并同时将锌、锰等杂质与镍、钴分离;用HCl反萃稀土,反萃液与氢氧化稀土中和得到氯化稀土.稀土的综合回收率为98.4 %,镍、钴的综合回收率为98.5 %.

     

    Abstract: A hydrometallurgical flow is designed to recover rare earth, nickel and cobalt from the anode of hydrogen-nickel battery. The recovery procedure includes: anode leaching with sulfuric acid; rare earth separation in the form of rare earth sulfate from nickel and cobalt; rare earth sulphate neutralization; rare earth, Zn2+ and Mn2+ separation in the lixivium from nickel and cobalt by using P507(2-ethylhexyl dihydrogen phosphate) and kerosene as extractant; stripping rare earth with HCl. The stripping solution is neutralized by rare earth hydroxide resulting the rare earth chloride. The total recovery ratios of rare earth, nickel and cobalt are 98.4 % and 98.5 % respectively.

     

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