Abstract
In this work, more than 70 wt % of ferromanganese slag (containing 40 wt % CaO) was used to synthesize high-calcium, CaO-MgO-Al2O3-SiO2 (CMAS) glass ceramics. The effect of SiO2/CaO on the structure, crystallization behavior and microstructure of high-calcium, CMAS, slag glass ceramics was studied by IR, NMR, DSC, XRD and SEM. The results showed that in the high-calcium, CMAS glass ceramics, the main existing forms of silicon–oxygen tetrahedra (Qn) were Q0 and Q1. With the increase in the SiO2/CaO, Qn changed from Q0 and Q1 (main units) to Q1 (main units) and Q2, and then to Q1 and Q2 (main units). The polymerization degree of Qn changed from low to high, making the glass more stable, which led to the increase in crystallization temperature and the decrease in crystallization kinetic constant (k) and frequency factor (υ). At the same time, the change in the Qn structure resulted in a gradual change to the main crystal, from akermanite to diopside–wollastonite.
Highlights
Ferromanganese is an important mineral resource and has a significant influence on the construction industry
In the field of glass ceramics, using ferromanganese slag to prepare architectural glass ceramics is rarely studied. This is because, compared with other slags, the ferromanganese slag cannot be used at such a high content in traditional CMAS systems [16,17,18]
Ferromanganese slag was used as the main raw material to prepare high-calcium CMAS glass ceramics, and the slag content was higher than 70 wt %
Summary
Ferromanganese is an important mineral resource and has a significant influence on the construction industry. In the field of glass ceramics, using ferromanganese slag to prepare architectural glass ceramics is rarely studied This is because, compared with other slags, the ferromanganese slag cannot be used at such a high content in traditional CMAS systems [16,17,18]. When using ferromanganese slag at high dosages, the CaO content in the glass composition will be higher than that of traditional CMAS systems. Ferromanganese slag was used as the main raw material to prepare high-calcium CMAS glass ceramics, and the slag content was higher than 70 wt %. Have been used to study the effects of the SiO2 /CaO ratio on the structure and crystallization of high-calcium CMAS glass ceramics
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