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Metallic Lead Recovery from the Damped Lead Battery Paste by Sodium Hydroxide Leaching and Electrowinning
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DOI：10.1134/S106782122560125X.png)
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Abstract
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A new hydro-electrometallurgical process to recover the lead from the damped lead battery paste by sodium hydroxide leaching and electrowinning is proposed. PbO2-bearing damped lead battery paste is first reduced with ferrous sulfate solution and PbSO4 in leaching residue is desulfurized with sodium hydroxide. The desulfurized paste is leached with sodium hydroxide and metallic lead is recovered in sodium plumbate solution based on alkaline by electrowinning. Several factors such as stirring speed, sodium hydroxide concentration, temperature and liquid to solid ratio were considered in leaching process of the desulphurization paste contained mainly Pb(OH)2 on the lead extraction and lead concentration. A lead extraction of more than 90% is obtained in optimal condition of this step. The factors such as lead content and sodium hydroxide content, temperature and current density on the cathodic current efficiency and electric power consumption were considered. The cathodic current efficiency and electric power consumption were more than 96% and less than 0.64 kWh/kg in optimal electrolytic condition, respectively.
Keywords:
damped lead battery paste
NaOH leaching
electrowinning
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