| Summary: | 碩士 === 國立臺北科技大學 === 材料及資源工程系碩士班 === 89 === To treat the incinerated ash is an important issue in Taiwan. Incinerated ash contains large amounts of hazardous materials such as dioxins and heavy metals. If these hazardous materials are carefully treated, they will cause detrimental secondary contamination. This study is to develop a molten process by using high frequency induction furnace and/or thermal plasma technique, in order to treat the incinerated fly ash. Under the high temperature treatment, incinerated ash could be reduced in volume and ultimately contamination problems were eliminated because the heavy metal ions replaced other ions and were confined in the framework of silicates.
The major components of the incinerated fly ash are SiO2, CaO and Al2O3 and nucleating agents, TiO2 and Fe2O3, are also present in reasonable amounts. A one-step heat treatment process was carried out at various temperatures (i.e. 850℃, 900℃, 950℃, 1000℃ and 1050℃) to obtain various microstructure materials. The major phase thus formed was gehlenite (Ca2Al2SiO7) which belongs to the melilite group. The properties of microstructure materials were evaluated for potential re-utilization as construction materials. Microstructure materials with improved physical and mechanical properties were obtained after post-heat treatment performed at low temperatures. These microstructure materials with preferred properties therefore were the potential material as a viable alternative for construction applications.
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