Production of titanium powder by metallothermic reduction of TiO2 in cold pressed pellets

作     者：ZHENG Hai-yan GUO Yong-chun SHEN Feng-man 郑海燕;郭永春;沈峰满

作者机构：Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education)Northeastern UniversityShenyang 110819China School of MetallurgyNortheastern UniversityShenyang 110819China 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2021年第28卷第1期

页      面：48-57页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Projects(51774071 50804007 51974073)supported by the National Natural Science Foundation of China 

主　　题：titanium dioxide titanium powder metellothermic reduction cold pressed pellet reduction index 

摘      要：In order to produce low-cost titanium(Ti)with high productivity,fundamental studies on producing metallic Ti from titanium dioxide(TiO2)in the cold pressed pellets were conducted by metallothermic reduction with an indirect contact *** paper focuses on discussing the mechanism of the reduction process and the relationships of RM(a revised reduction index)with reduction temperature,reduction time,and mole ratio of TiO2 to CaCl2(nTiO2/nCaCl2)in the *** results show that metallic Ti was obtained from the reduction of TiO2 in the pellets by calcium(Ca)vapor;pellets were reduced homogenously and Ca vapor diffused into the porous pellets by Knudsen diffusion or the mixing diffusion of molecular diffusion and Knudsen diffusion at 1273 K;RM increased with the increases of temperature and reduction time and was 96.34%when TRedu=1273 K,tRedu=6 h,and nTiO2/nCaCl2=4;the reasonable nTiO2/nCaCl2 value is 3−5 for the pellets with enough strength and high RM.