Effect of B<sub>2</sub>O<sub>3</sub> on Structure of CaO–Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–TiO<sub>2</sub>–B<sub>2</sub>O<sub>3</sub> Glassy Systems
Feifei Lai, Wen Yao, Jiangling Li
Abstract
Titanium-bearing blast furnace slag is an important metallurgical waste, but presently, it is difficult for it to be effectively utilized. B2O3 is an important modifier to greatly promote the mass diffusion of crystallization of Ti-enriched phases in molten slags. To furtherly understand the effect of B2O3 on the structure of Ti-bearing slag, CaO–Al2O3–SiO2–TiO2–B2O3 glasses of various B2O3 were investigated by combining Raman, FT-IR, and X-ray photoelectron spectroscopy. The results showed that BO3 was the dominant structure, which decreased slightly as the B2O3 content increased, while BO4 increased. Three coordination forms (TiO4, TiO5, and TiO6) of the Ti-structure were discovered in the prepared Ti-bearing glasses. The percentage of TiO4 gradually increased and became the main structural unit as the increased B2O3. The increase of BO4 and TiO4 leaded to an increased amount of network connection units, such as SiO4, to increase the degree of polymerization of the prepared Ti-bearing glasses.