| Summary: | 碩士 === 國立臺北科技大學 === 資源工程研究所 === 106 === Due to the development of technology, the smectite group mineral is widely used in many fields of industry and material application, the pursuit of high phase purity and yield in synthesized smectite is getting more important. In this work, trioctahedral smectite was synthesized by hydrothermal method based on the formula Na2x(Al2(1-x)Mg2x□)Si4O10(OH)2, and Taguchi method was first used to optimize the phase purity and yield of the synthesized smectite. The yield of synthesized smectite is also first time be estimated by both quantitative phase analysis using X-ray diffraction and Rietveld Method Software in this work. The effect of synthesis factors was also discussed.
The Na2O-MgO-Al2O3-SiO2-H2O system was reacted for smectite synthesis at temperatures 200 and 220℃, duration time from 48 to 96 h, and with pH of 7, 9 and 11. The results indicate that the duration time, starting material and type of mineralizer are the three most important factors affect the phase purity and yield of synthesized smectite. The yield and phase purity of the synthesized smectite can reach up to 82.6% and 80.7% respectively on the synthesis condition that optimized by Taguchi method.
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