Polymerization behavior of silicic acid with coexisting magnesium and aluminum ions

被引：0
作者：
机构：
[1] Key Laboratory of Metallurgical Emission Reduction and Resources Recycling of Ministry of Education, Anhui University of Technology, Ma'anshan 243002, Anhui
来源：
Shen, X. (xxxxmx@126.com) | 1600年 / Materials China卷 / 65期
关键词：
Gel time; Gels; Magnesium and aluminum ions; Polymerization; Silica; Silicic acid system;
D O I：
10.3969/j.issn.0438-1157.2014.03.047
中图分类号：
学科分类号：
摘要：
Gel time, polymerization rate of monosilicic acid, and thermal performance of gel of silicic acid system with coexisting Mg2+ and Al3+ ions were investigated. At pH<4, gel time of silicic acid system decreased with the increase of coexisting concentration of Mg2+ and Al3+ ions, and Al3+ ions played an important role in the coagulation process. Polymerization reaction rate constant of monosilicic acid, for silicic acid system with coexisting Mg2+ and Al3+ ions, was higher than that for silicic acid without metallic ions, and average rate constant for MA0.1+0.1 system was k0̄=7.28×10-4, k1̄=5.62×10-4. Crystallization temperature and crystal transformation temperature of silicic acid system with coexisting Mg2+ and Al3+ ions were lower than those of silicic acid without metallic ions, and chemical formula of hydrated silicon dioxide for MA0.1+0.1 system calculated by TG curve was SiO2·0.556 H2O. © All Rights Reserved.
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页码：1104 / 1110
页数：6
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