Hydrolytic stability of sodium silicate gels in the presence of aluminum

被引：48

作者：

Giannopoulou, I. ^{[1
]}

Panias, D. ^{[1
]}

机构：

[1] Natl Tech Univ Athens, Met Lab, Sch Min & Met Engn, Athens 15780, Greece

来源：

JOURNAL OF MATERIALS SCIENCE | 2010年 / 45卷 / 19期

关键词：

X-RAY-DIFFRACTION; SYNTHESIS PARAMETERS; SLAG; GEOPOLYMERS; MINERALS; GLASS;

D O I：

10.1007/s10853-010-4586-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Polycondensation in alkali silicate solutions comprises a fundamental process of the geopolymerization technology. Previous works had shown that the hydrolytic stability of sodium silicate gels depends on the SiO2/Na2O ratio. Sodium silicate gels totally insoluble in water can be produced at SiO2/Na2O molar ratios higher than 4.4. This article aims at elucidating the effect of tetra-coordinated aluminum addition on the hydrolytic stability of sodium silicate gels. According to the results, the aluminum addition stabilizes the sodium silicate gels in an aqueous environment. A sodium silicate gel with SiO2/Na2O molar ratio 3.48, which is totally soluble in deionized water at ambient temperature, can be transformed to insoluble sodium hydroaluminosilicates with the addition of tetrahedral aluminum at Al/Si molar ratios higher than 0.08. In addition, this article studies the structure of prepared sodium hydroaluminosilicates and draws very useful conclusions for the geopolymerization technology.

引用

页码：5370 / 5377

页数：8

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