Fabrication and analysis of new bismuth borate glasses containing cement kiln dust

摘要

New bismuth alkali borate glasses based on cement kiln dust (CKD) have the chemical formula xCKD-(100-x) (B_2O_3-Bi_2O_3-Na_2O-BaO) were fabricated by the conventional melt quenching technique. The glasses were analyzed by roomtemperature FTIR, density and ultrasonic measurements to study the effect of CKD on the structure and the mechanical parameters of the glasses. The physical parameters such as the density and the elastic moduli of the studied bismuth alkali borate network are sensitive to the concentration of CKD. The results indicate a creation of CaO_6 and SiO_4 on one hand and a mutual conversion between BO_4 and BO_3 structural units on the other hand. These units control the short-range order of the glasses and the non-linearity decrease of the density and the increase of the ultrasonic parameters. The results were interpreted in terms of the vibrations of the various structural units and the type of bonding between different atoms.