Dissolution and diffusion of TiO_2 in the CaO-Al_2O_3-SiO_2 slag

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

作者机构：State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology Beijing School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing School of Materials and MetallurgyNortheastern University 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2014年第21卷第4期

页      面：345-352页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：The financial support from the National Science Founda-tion of China(No.51090384) 

主　　题：slags titanium dioxide dissolution diffusion interface 

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. Ac-cording 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 de-tail.