Abstract:The removal of Co2+ in zinc sulfate solution by sodium dimethyl dithiocarbamate (SDD) instead of zinc powder was studied. It was found that SDD could effectively remove Co2+ from ZnSO4solution, the optimum process conditions for removing cobalt by SDD were obtained as follows: under the conditions of 400 mg/L SDD, 23 mg/L NaNO2, 4.0 initial pH, 75 ℃ reaction temperature and 1.5 h reaction time, Co2+ in zinc sulfate solution can be removed below 0.2 mg/L. Electrodeposition test was carried out with zinc sulfate solution obtained by removing cobalt with SDD. After 10 consecutive electrodeposition cycles, the average current efficiency reached 93.33%, and the quality of zinc tablets all reached the national standard 0# zinc standard, indicating that the process of removing cobalt with SDD would not have adverse effects on the subsequent electrodeposition process of zinc, SDD can be used as a purification reagent for cobalt removal instead of zinc powder.