锌湿法冶金过程中臭氧氧化沉淀除去微量钴

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

为有效去除锌湿法冶金过程中的微量钴,探索采用臭氧氧化净化ZnSO4溶液中钴的可行性,考察搅拌速度、反应温度、气体流量、溶液pH值、钴离子浓度、锌离子浓度等因素对除钴效果的影响。结果表明:在锌离子初始浓度100 g/L、钴离子初始浓度20 mg/L、温度30℃、气体流量800 mL/min、pH=5.0、搅拌速度800 r/min等条件下,反应30 min后,钴浓度可降至0.2 mg/L,除钴率高达99%。

In order to remove trace cobalt in the process of zinc extractive hydrometallurgy, a novel method to precipitate cobalt from ZnSO4 solution 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 ℃.