In this study the zinc-manganese batteries are recovered by using hydrometallurgy method which can be separated into three major parts including two-stage acid leaching system solvent extraction and final refining to segregate complex elements from the spent Zn-Mn battery The goal of this research is concentrated on the recovery of zinc and manganese from the electrode powder In consideration of the serious co-extraction characteristic from zinc and manganese system two stages leaching is first carried out before the solvent extraction After the pretreatment process the spent electrode powder is first deposed of with first stage leaching procedure After that 99 5% of zinc and the small amount of purity are transferred into the liquid phase; more than 90% of Manganese is maintained in the solid phase eventually In the second stage leaching process the rest manganese is dissolved by reductive acid leaching Thereafter in the separation and purification step the solvent extraction is investigated The parameters such as extractant concentration extracting time equilibrium pH value and organic-aqueous ratio (O/A) are all analyzed in detail Finally chemical precipitation and electrorefining are used in the refining process After calcination the ZnO is obtained in high-purity level with 97 6% quality and (EMD) MnO2 is obtained in high-purity level with 99 7% quality as well
Date of Award | 2019 |
---|
Original language | English |
---|
Supervisor | Wei-sheng Chen (Supervisor) |
---|
Recovery of metals from electrode powder of spent zinc manganese batteries
朕璽, 張. (Author). 2019
Student thesis: Doctoral Thesis