Activity Model and Its Application in Quarternary System CaO-FeO-SiO_2-WO_3

作     者：GUO Pei-min LI Zheng-bang ZHAO Pei 

作者机构：State Key Laboratory for Advanced Iron and Steel Processes and Materials Central Iron andSteel Research Institute Beijing 100081 China 

出 版 物：《Journal of Iron and Steel Research International》 (J. Iron Steel Res. Int.)

年 卷 期：2010年第17卷第1期

页      面：12-17页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0806[工学-冶金工程] 0817[工学-化学工程与技术] 080601[工学-冶金物理化学] 0703[理学-化学] 

基　　金：Item Sponsored by National Science and Technology Support Program for 11th Five-Year Plan of China(2006BAE03A12 2006BAE03A05) 

主　　题：activity model scheelite thermodynamics direct reduction 

摘      要：The activity model of CaO-FeO-SiO2-WO3 quarternary system is built according to the coexistence theory of slag structure and the reduction thermodynamics of scheelite is discussed by using this model. The activities of SiO2 and WO3 decrease, while the activity of CaO increases with increasing the basicity of slag. Among SiC, carbon and silicon reactants, the reducing capability of SiC is the strongest, while that of carbon is the poorest at high temperature （about 1 873 K）. Increasing the content of silicon or carbon is beneficial for increasing the yield of tungsten. Oxidizability of slag has a significant effect on the yield of tungsten. Controlling basicity and oxidizability of slag can decrease the oxidation loss of tungsten.