聚天冬氨酸用于废铅酸电池湿法回收铅工艺

Application of polyaspartic acid in recovering lead from spent lead-acid battery by hydrometallurgical process

在废铅酸电池的柠檬酸-柠檬酸钠湿法浸取回收铅工艺中,引入聚天冬氨酸（PASP）,研究PASP对柠檬酸铅前驱体和铅氧化物的合成及产物性能的影响。当PASP与废铅化合物的质量比为1∶4时,回收的铅氧化物正极以20 m A/cm^2在2.35~1.70 V循环,放电比容量可达96.7 m Ah/g,对应的活性物质利用率为40.3%;循环50次的容量保持率高于70%。

The polyaspartic acid（PASP） was introduced into the citrate-sodium citrate wet leaching process for recovering lead compounds from spent lead-acid battery. The influences of the addition of PASP to the synthesis of precursors and lead oxides and electrochemical performance of prepared materials used to positive electrodes were studied. The specific discharge capacity of the prepared lead oxide reached up to 96. 7 m Ah / g,corresponding to the utilization of positive electrode active material was 40. 3%when the mass ratio of PASP and spent lead compounds was 1∶ 4,its capacity retention rate was over 70% after 50 cycles.