ACID ELECTROLYTIC TREATMENT PROCESS OF SCRAP BATTERY SLUDGE
(Institute of Environmental Protection; Hunan University; Changsha 410082)
Abstract: The physicochemical problems involved in the process of recovering lead from scrap battery sludge by a new acid electrolytic method have been investigated adopting electrochemical method. The new techniques developed include the utilization of K2CO3 as desulphurizer, FeSO 4-H2SO4 system in reducing converting, and PbSiF6-H2SiF6 as electrolyte in electrowinning. Under experimental conditions, lead greater than 99.99% in purity was obtained with current efficiency greater than 98%, lead direct recovery above 95%, lead total recovery higher than 98%. Research and analysis showed that this process has many advantages, such as strong chemical driving force, stable operation and high lead recovery.
Key words: lead battery sludge acid electrolytic treatment