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URN etd-0716107-125138 Statistics This thesis had been viewed 3017 times. Download 1509 times. Author Tsung-Ta Chiang Author's Email Address No Public. Department Materials Engineering Year 2006 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 104 Title Synthesis of Calcium Silicate from Rice Hull Ash by Hydrothermal Method Keyword Wollastonite Rice Hull Ash Hydrothermal Method Calcium Silicate Calcium Silicate Hydrothermal Method Rice Hull Ash Wollastonite Abstract When rice hull burned under 800℃for 3 hours, it become rice hull ash (RHs) and that contained a lot of silica (cristobalite), inorganic substances, and some metallic compound. We try four types of precursors to synthesize calcium silicate by hydrothermal method, which included: (1). RHs-CaO-H2O system, (2). RHs-Ca(OH)2-H2O system, (3). RHs-CaCO3-H2O system, (4). RHs-Industrial CaO-RHs-H2O system. In this research, we find RHs-CaO-H2O system, when products synthesized in molar ratio Ca/Si=0.55 to get Ca14Si24O58(OH)8-H2O and molar ratio Ca/Si=1 to get Ca6Si6O17(OH)2, compared with JCPDS card #29-0382 Ca14Si24O58(OH)8-H2O(truscottite) and JCPDS card #23-0125 Ca6Si6O17(OH)2(xonotlite). In RHs-Ca(OH)2-H2O system, the product were mainly Ca5(Si6O17)(OH)2(tobermorite). And in RHs-IndustrailCaO- H2O system, the mainly products also were Ca6Si6O17(OH)2(xonotlite). And then truscottite, xonotlite and tobermorite calcined under 1000℃ to get wollastonite(CaSiO3). Finally, it is impossible to synthesize hydrated calcium silicates without additives or mineralizer condition in RHs-CaCO3- H20 system. Advisor Committee Yao-Shan Hsu - advisor
Wan-Yi Wei - co-chair
Wei-Hsing Tuan - co-chair
Files Date of Defense 2007-06-12 Date of Submission 2007-07-16