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

Abstract

ABSTRACTThe 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 1.8 times of the theoretical chemical reaction, pH 3, temperature 20°C and reaction time 1 h. When the reaction time is 1 h, the amount of sodium persulfate 4 times 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%.