Study Concerning PbO Solubility to NaOH Solution for the Treatment of Sulfate-oxide Pastes Obtained from Dismantling. used Lead-aeid Batteries

摘要

Growing of waste lead-acid battery quantity, collected from processors, means the growing demand for secondary lead as raw material for car batteries, both needed for increased cars production and for replacing of waste batteries for increased number of automotive in service. During operation of accumulator batteries due to the chemical reaction that occurs during their recharging and unloading, lead sulfate is forming, therefore, if in the initial paste the major component is PbO, then in accumulator paste the main component is PbSO4, Finally, sulfuric acid concentration decreases at 10 %. Leaching method with sodium hydroxide solutions is one of the most recent initiatives for lead obtaining, attempting a double win: the environment pollution control and processing of secondary resources such as volatile dust resulted from lead extractive metallurgy of primary resources. This method consists in leaching with sodium hydroxide solutions followed by electrolytic extraction of lead and regeneration of sodium hydroxide solution.