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Effects of nucleating agents on crystallization of arc-molten slag from incinerator fly ash |
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| Authors: | Liu Hanqiao Xu Xian Wei Guoxia Sun Lei Zhang Rui |
| Institution: | 1. School of Environmental Science and Technology, Tianjin University, Tianjin 300072, China;School of Energy and Safety Engineering, Tianjin Chengjian University, Tianjin 300384, China;Tianjin Eco-City Environmental Protection Co.Ltd., Tianjin 300468, China 2. School of Energy and Safety Engineering, Tianjin Chengjian University, Tianjin 300384, China |
| Abstract: | Glass-ceramics obtained from the electric arc furnace molten slag of incinerator fly ash was produced by applying nucleation and crystallization through heat treatment process. The effects of nucleating agent (TiO2 and Cr2O3)on the crystallization kinetics and heat treatment schedule of the slag were investigated. The results show that the nucleating agents changed the crystallization phase and morphology of the obtained glass-ceramics. The optimum heat treatment schedule of the glass with TiO2 was determined as nucleation at 952 K for 1.5 h and crystal growth at 1258 K for 1.5 h, while those values with Cr2O3 were estimated at 971 K for 2 h and at 1 238 K for 2 h. TiO2 acting as nucleating agent could decrease the activation energy of the slag and shorten the total thermal treatment time in comparison with Cr2O3. The glass-ceramics obtained under the optimum heat treatment condition was environment-friendly and had remarkable physical/mechanical properties and chemical durability. |
| Keywords: | incinerator fly ash glass-ceramics nucleating agents electric arc furnace |
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