| Summary: | 碩士 === 國立臺北科技大學 === 材料及資源工程系碩士班 === 92 === Due to the population density was higher and rising quickly, the suitable place for traditional landfill was getting difficulty to find in Taiwan. Therefore, there are 30 MSW incinerators under construction and will be completed before end of 2005. It is estimated that over 1.5 to 2.0 million tones of incinerator ashes will be generated annually. These incinerated ashes contain large amount of hazardous materials such as heavy metals and Dioxins. If these hazardous materials cannot be carefully treated, it can be endanger the ecological environment. This research work applied the thermal plasma melting and vitrification technology to treat incinerator ashes. The melted slag can be produced the microstructure materials via sintering and heat treatment procedure.
The experiment results showed that large amount of heavy metals, such as, Pb, Cd and Cu, evaporated into gas phase during melting, but Cr still remained in the incinerator ashes based slag. The activation energy of the crystallization for quenched slag were around 600-670 kJmol-1 by using non-isothermal method. During the lab-scale plasma molten system, the characterizations of the microstructure materials from slag-13 were better than that of fabricated form slag-31. When using the pilot-scale plasma molten system, the melting was quenching into water in order to obtain the glassiness slag. The properties of the microstructure materials from quenched slag were better than that of manufactured by slowly cooled slag. The best physical/mechanical and chemical resistance properties of the microstructure materials were produced at 1100-1150℃ for 2 hours heat treatment. Diopside and gehlenite were formed as the major crystalline phases. These microstructure materials have great potential for reutilization as non-porous or water permeable materials.
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