| Summary: | 碩士 === 國立成功大學 === 環境工程學系碩博士班 === 97 === The object of this study is to recovery useful metals including Fe, Mn and Zn from waste alkaline batteries and to stabilize those batteries by vitrification. We use the blend of dolomite, limestone and cullet as the additive to enhance the vitrification. The basicity (mass ratio of CaO to SiO2 before vitrification) was adjusted to 0.610 which was favorable for vitrification. The output materials included ingot, slag, and flue gas (gas phase and particulate phase metals). The major composition of ingot was Fe and Mn of which the sum was 80~90% and this product was a good additive for iron making process. In slag, the major constituents were Ca, Mg, Mn, and Si contributed by the additives and toxicity characteristics leaching procedure also reveals its non-toxicity. As for flue gas, the major species were Zn and K which were predominately in particulate phase. The output/input ratio indicated that Fe and Mn mostly moved to ingot, Zn predominately vaporized to flue gas, and Ca, Mg and Si were still retained in slags. Overall speaking, the results shows that the vitrification is a prospective technology to stabilize the waste alkaline batteries and to recovery Fe, Mn and Zn simultaneously.
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