Dissolution and diffusion of TiO2 in the CaO-Al2O3-SiO2 slag

Zhong-shan Ren; Xiao-jun Hu; Xin-mei Hou; Xiang-xin Xue; Kuo-chih Chou

doi:10.1007/s12613-014-0915-8

Volume 21 Issue 4

Apr. 2014

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文章导航 > 矿物冶金与材料学报（英文） > 2014 > 21(4): 345-352

Zhong-shan Ren, Xiao-jun Hu, Xin-mei Hou, Xiang-xin Xue, and Kuo-chih Chou, Dissolution and diffusion of TiO₂ in the CaO-Al₂O₃-SiO₂ slag, Int. J. Miner. Metall. Mater., 21(2014), No. 4, pp. 345-352. https://doi.org/10.1007/s12613-014-0915-8

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Zhong-shan Ren, Xiao-jun Hu, Xin-mei Hou, Xiang-xin Xue, and Kuo-chih Chou, Dissolution and diffusion of TiO2 in the CaO-Al2O3-SiO2 slag, Int. J. Miner. Metall. Mater., 21(2014), No. 4, pp. 345-352. https://doi.org/10.1007/s12613-014-0915-8

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Dissolution and diffusion of TiO₂ in the CaO-Al₂O₃-SiO₂ slag

State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China
School of Materials and Metallurgy, Northeastern University, Shenyang, 110006, China

通讯作者:
Xiao-jun Hu E-mail: huxiaojun@ustb.edu.cn

中文摘要

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.

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Dissolution and diffusion of TiO₂ in the CaO-Al₂O₃-SiO₂ slag

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Abstract

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.
- slags;
- titanium dioxide;
- dissolution;
- diffusion;
- interface