Efficient purification of trace cobalt in zinc hydrometallurgical process by ozone oxidation

In order to remove trace cobalt in the process of zinc extractive hydrometallurgy,a novel method to precipitate cobalt from ZnSO4solution by ozone oxidation was proposed.The factors influencing the effect of removing cobalt,including stirring speed,temperature,gas flow rate,pH and concentrations of cobalt ion and zinc ion were investigated.The results show that the cobalt concentrations and elimination rate can reach 0.2 mg/L and 99%,respectively,under the solution conditions as initial concentrations of cobalt and zinc 20 mg/L and 100 g/L,controlling pH of 5.0,stirring speed of 800 r/min,gas flow rate of 800 mL/min,reacting time of 30 min at 30 ℃.