Lightweight design of bauxite-SiC composite refractories as the lining of rotary cement kiln using alternative fuels |
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| Affiliation: | 1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Chair of Ceramics, Montanuniversitaet Leoben, Peter-Tunner-Straße 5, 8700, Leoben, Austria;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. National-provincial Joint Eingineering Research Center of High Temperature Materials and Lining Technology, Wuhan, China;3. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, China;4. Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology, Ministry of Industry and Information Technology, China;1. Chemistry Department, Faculty of Sciences & Arts – Khulais, University of Jeddah, Saudi Arabia;2. Refractories, Ceramics and Building Materials Department, National Research Centre, Dokki, Cairo, Egypt;3. Department of Chemistry, Faculty of Science & Technology, Omdurman Islamic University, Sudan;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan 430081, PR China;2. Chair of Ceramics, Montanuniversität Leoben, A-8700 Leoben, Austria;3. Hubei Key Laboratory for Coal Conversion and New Carbon Materials, Wuhan University of Science & Technology, Wuhan 430081, PR China |
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| Abstract: | To meet the demand of energy-saving and adapt to the change from coal to the alternative fuel in the rotary cement kiln, bauxite-SiC refractories were fabricated by the incorporation of silica sol coated lightweight mullite aggregates in order to achieve low thermal conductivity and superior alkali vapor attack resistance simultaneously. Furthermore, the mechanism of resistance to alkali vapor attach was investigated by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results showed that the thermal conductivity of bauxite-SiC specimens decreased gradually with increasing amounts of silica sol coated lightweight mullite aggregates while changes in the alkali vapor attach were not detectable. The shell-covered structure with a silica sol coating on the surface of lightweight aggregates hindered alkali vapor diffusion into the aggregates at high temperature. Bauxite-SiC refractories possessed lower thermal conductivity, superior alkali attack resistance and higher mechanical properties compared with the specimens which contained pristine lightweight aggregates. |
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| Keywords: | Bauxite-SiC composite refractories Silica sol coating Lightweight mullite aggregate Thermal conductivity Alkali vapor attack resistance |
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