Abstract
The structure and viscosity of CaF2-CaO-Al2O3-B2O3-SiO2-Li2O slag with varying CaF2 and Li2O contents were investigated by Raman spectroscopy, 27Al, 29Si and 11B magic angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopy, and rotating cylinder method, respectively. The relative fraction ofQAl2 significantly increases, the fractions ofQAl3 andQAl4 decrease with increasing the CaF2 or Li2O content. Aluminum exists in the form of four-coordinated aluminum (AlⅣ) corresponding to AlO4 and a small amount of AlO3F. The fraction ofQSi0 species increases at the expense ofQSi1,QSi2(1Al) andQSi2 with increasing the CaF2 or Li2O content. B is present in the form of BⅢ, besides 0.57% of BIV in the glass with 14.69mass% CaF2. The relative fraction of T0 increases and T1 decreases as the CaF2 or Li2O content is increased. The degree of polymerization of aluminosilicate and borates decreases with increasing the CaF2 or Li2O content, which is consistent with the results of viscosity and viscous activation energy.
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