Technology of dehydration and transformation of silicic acid

• Published in: Rare metals Vol. 32; no. 5; pp. 532 - 536
• Main Authors: He, Xiao-Cai, Xie, Gang, Li, Hui-Re, Li, Rong-Xing, Yang, Da-Jin, Xu, Qing-Xin
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.10.2013; Springer Nature B.V; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650051, China; Department of Metallurgical Researching, Kunming Metallurgy Research Institute, Kunming 650031, China%Department of Metallurgical Researching, Kunming Metallurgy Research Institute, Kunming 650031, China%Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650051, China
• Subjects: Biomaterials; Chemistry and Materials Science; Energy; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Physical Chemistry; 体积收缩率; 偏硅酸; 压力反应; 反应时间; 层状结构; 脱水率; 转化技术; 高温度; Transformation; Dehydration; Silicic acid; Pressurized
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-013-0087-0

The technology that silicic acid was pressurized under high temperature in order to dehydrate and transform was investigated in the paper. The effects, such as the ratio of liquid to solid, pressure, temperature, and reaction time on the dehydration rate and volume shrinkage rate, were researched. The experimental results show that the dehy- dration rate of silicic acid is up to 41.20 %, accompanying with the volume shrinkage rate of 40.37 % after silicic acid is pressurized under high temperature in the high-pressure kettle. The results of silicic acid tested by SEM indicate that the metasilicate acid molecules and water molecules are closely arranged, and there are almost no gaps before pressure reaction. There are many gaps accompanying with formatting lamellar structure after pressure reaction. The experimental results indicate the effect that silicic acid is dehydrated and transformation is obvious under high temperature and pressure.