Study on the Use of Lead Removers in Zinc Electrowinning and Their Effect on the Electrolytic Process
For zinc electrowinning,lead is one of the main impurity metals affecting the quality of zinc ingot prod-ucts.The zinc electrowinning industry is now commonly used to add SrCO3 method to reduce the lead content in the electrolyte,but in recent years the price of SrCO3 has risen sharply resulting in increased cost of lead remov-al,and too much SrCO3 is also harmful,it will make the tank voltage rise.Therefore,a new type of linear polymer lead remover CQJ-01,which can replace SrCO3 for low-cost lead removal,was used in this study.The CQJ-01 effect was compared by varying the amount of lead remover added,and the current efficiency was calculated based on the precipitated zinc mass.The results of electrolysis experiments show that the lead content(mass frac-tion)of zinc flakes is stabilized at about 0.004％by adding 0 mg/L,3 mg/L,and 6 mg/L of lead remover in 4 h electrolysis experiments,respectively.Failure to meet the national standard GB/T 470-2008:0#Zn in the lead content of ≤0.003％of requirements.And lower current efficiency of lead removal,so optimized and improved e-lectrolysis experiments were conducted.In the enhanced optimization experiment with the lowest lead content of 0.000 63％,which has a better lead removal effect than SrCO3.The surface morphology of the zinc flakes was ob-served using scanning electron microscopy.The impact of lead remover on the electrochemical behavior during zinc electrowinning were investigated by cyclic voltammetry with the addition of 1 mg/L and 3 mg/L lead remov-er settled for different times in two base liquids,namely,industrial electrolyte and ZnSO4 solution,respectively.The results showed that adding lead remover increased the overvoltage of the reduction reaction and inhibited the hydrogen precipitation reaction.
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