Extraction of Alkalis from Silicate Materials PART 2—Crystalline Silicate Materials

Abstract

A feature of silicate materials is that they can exist in two antagonistic states—amorphous and crystalline. In both cases, alkalis, which are always present in chemical compositions, play an important role. A feature of alkalis in the composition of silicate materials is that at certain stages of the synthesis of products, they play a positive role, reducing the temperature of synthesis, but worsening the properties of these products at the stage of their operation. Synthesis products should be understood as important building materials such as building glass and cement. It is known that the performance properties of glass and cement can be improved by the extraction of alkalis. In the first part of the article, the issues of extraction of alkalis in amorphous silicate materials-inorganic glasses were considered. This article presents the results of studies on the extraction process of alkalis in crystalline silicate materials-cement.

Properties of Geopolymers Based on Metakaolin and Soda-Lime Waste Glass

“…The use of glass as an aggregate for mortar or concrete reduces the strength of the obtained products as a result of the reduction in the adhesion between the slurry and the glass aggregate. Moreover, the use of glass as a non-clinker component of cement is also limited due to the high content of alkali in the waste glass, which in turn causes an alkali-silica reaction (ASR) [14][15][16][17][18][19][20]. The potential use of glass cullet as a non-clinker component of cement is not clear.…”