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Dissolution and diffusion of TiO2 in the CaO-Al2O3-SiO2 slag |
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| Authors: | Zhong-shan Ren Xiao-jun Hu Xin-mei Hou Xiang-xin Xue Kuo-chih Chou |
| Affiliation: | 1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China 3. School of Materials and Metallurgy, Northeastern University, Shenyang, 110006, China |
| Abstract: | The dissolution of TiO2 in the CaO-Al2O3-SiO2 slag under static conditions was studied in the temperature range from 1643 K to 1703 K. After TiO2 dissolved, the microstructure of the interface between TiO2 and the slag was observed by scanning electron microscopy, and the concentration profiles of Ti4+ and other ions across the TiO2/slag interfaces were analyzed by energy-dispersive X-ray spectroscopy. On the basis of these results, the dissolution behavior of TiO2 was evaluated, and the diffusivity of Ti4+ in the bulk slag was estimated. According to the Stokes-Einstein relation, the viscosity calculated by a previously reported model gave a diffusivity of Ti4+ ions greater than that estimated by the concentration profiles of Ti4+ ions. The mechanism of TiO2 dissolution in the CaO-Al2O3-SiO2 slag is discussed in detail. |
| Keywords: | slags titanium dioxide dissolution diffusion interface |
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