Study on the preparation of battery grade cobalt carbonate from PTA oxidation residue

摘要

The oxidation residue coming from the process of production of PTA is an important secondary resources. PTA residue was used as raw material, and the battery grade cobalt carbonate was made after removing manganese. The optimum conditions on the precipitating cobalt by using sodium sulfide and the removing manganese by oxidation precipitation were investigated. The results demonstrate that the maximum sulfide precipitation rate of cobalt is 99.9%, when the amount of sodium sulfide is 1.8times of the theoretical chemical reaction, pH 3, temperature 20 degrees C and reaction time 1h. When the reaction time is 1h, the amount of sodium persulfate 4times of the theoretical amount and pH 3, the oxidation precipitation rate of manganese can reach 99%. After the processes of sulfide precipitation of cobalt and oxidation precipitation of manganese, the battery grade cobalt carbonate was prepared. The purity of the battery grade cobalt carbonate is greater than 99.9%.