从低浓度含钴浸出液中制取电池级氧化钴

研究了从低浓度含钴浸出液中制取电池级氧化钴的工艺。采用碳酸氢铵调节盐酸浸出液的pH值至5,加入Na2S溶液除杂。用P507+磺化煤油体系萃取净化液中的Co2+,硫酸反萃回收硫酸钴。当溶液pH=2,60℃时,(NH4)2C2O4按1∶1的比例加入反萃液中,同时加入20%的聚乙二醇作为分散剂沉钴。滤渣在55℃条件下真空干燥、在400℃下焙烧,制备得到粒度分布均匀的Co3O4粉末。根据SEM及ICP-AES对产物进行定性定量分析可知,Co3O4的纯度为95.30%,Co的回收率为71.2%。

Preparation of battery-grade cobalt oxide from low concentration cathode leachate of LIB

The battery-grade cobalt oxide was prepared from the leach solution with low concentration of cobalt.The pH of the hydrochloric acid leaching solution was adjusted to 5 by ammonium bicarbonate solution to remove Al3+,and Na2S was added to remove Cu2+.Co2+ was extracted using organic phase composition of P507 + sulfonated kerosene after clearing,and the recovery of cobalt sulfate was stripping with sulfuric acid.Co was precipitated by saturated(NH4)2C2O4 solution in the condition of 60 ℃,pH=2,cobalt solution∶(NH4)2C2O4 solution=1∶1,with 20% polyethylene glycol as dispersing agent.The filter residue was dried under the vacuum condition at the temperature of 55 ℃,then the filter residue was roasted at the temperature of 400 ℃ for 2.5 h,and finally the particles of Co3O4 could be obtained.According to the analysis of SEM and ICP-AES,the purity of Co3O4 was 95.30%,and the recovery rate of Co was 71.2%.