| Summary: | 碩士 === 大葉大學 === 環境工程學系碩士班 === 101 === The main purpose of this study is to recycle waste manganese and zinc from the black substance of electrodes of spent batteries. The research works adopted in this study include component analysis, sulfuric acid leaching, precipitation, crystallization and the separation of manganese and zinc.
The results of this study indicate that the collected black substance contains manganese, zinc and iron of 23.4%, 23.35% and 0.68% respectively. Sulfuric acid can be used to leach 100% of zinc with small amounts of manganese impurity from the black substance. This zinc dipping solution was added to potassium permanganate, this solution contained magansese which was leached to precicpitate 100% manganese. At 8000C roasting, magansese residue can be obtained from the best zinc sulfate impregnated solution. In addition, this gave a better recovery effect of 100%.
Sodium hydroxide was used to adjust the pH of the manganese impregnatin solution to recover, by means of precipitation, zinc and iron. After filtration the solution contained a pure source of manganese. This impregnation solution is preferred due to the absence of zinc and iron impurities to yield high purity manganese. The saturation of this best impregnation solution with sodium carbonate generated a precipitate, identified by Scanning Electron Microsroscopy and Electron Dispersive Spectroscopy (SEM-EDS), to be manganese carbonate.
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