Yu Bin, Yuan Tiechui, Xiao Daihong, Sun Zhaohui, Pan Cheng. Existing States of Vanadium in Slag during the Preparation of FeV50 by Aluminum Thermal Reduction[J]. IRON STEEL VANADIUM TITANIUM, 2019, 40(4): 24-29. doi: 10.7513/j.issn.1004-7638.2019.04.005
Citation:
Yu Bin, Yuan Tiechui, Xiao Daihong, Sun Zhaohui, Pan Cheng. Existing States of Vanadium in Slag during the Preparation of FeV50 by Aluminum Thermal Reduction[J]. IRON STEEL VANADIUM TITANIUM, 2019, 40(4): 24-29. doi: 10.7513/j.issn.1004-7638.2019.04.005
Yu Bin, Yuan Tiechui, Xiao Daihong, Sun Zhaohui, Pan Cheng. Existing States of Vanadium in Slag during the Preparation of FeV50 by Aluminum Thermal Reduction[J]. IRON STEEL VANADIUM TITANIUM, 2019, 40(4): 24-29. doi: 10.7513/j.issn.1004-7638.2019.04.005
Citation:
Yu Bin, Yuan Tiechui, Xiao Daihong, Sun Zhaohui, Pan Cheng. Existing States of Vanadium in Slag during the Preparation of FeV50 by Aluminum Thermal Reduction[J]. IRON STEEL VANADIUM TITANIUM, 2019, 40(4): 24-29. doi: 10.7513/j.issn.1004-7638.2019.04.005
1. Central South University, Powder Metallurgy Research Institute, Changsha 410012, Hunan, China;
2. Pangang Group Research Institute Co., Ltd., State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, Sichuan, China
The effect of different smelting stages on the occurrence of vanadium in the slag during the aluminum thermal reduction for FeV50 alloy preparation was analyzed,the thermodynamic reduction limit of vanadium in the slag was calculated by the study of V-O and VO-Al equilibrium theory.The actual stable structure of vanadium in the slag was obtained by different means of phase analysis.The results demonstrate that the steady state of vanadium in the slag is VO when the slag and alloy coexist,while the stability of VO and V2O3 is related to the partial pressure of oxygen after slag discharge.VO would be further oxidized under the condition of atmospheric pressure with the equilibrium oxygen partial pressure of 0.41 Pa.The total vanadium in the slag decreases with the increasing of aluminum in alloy,and the theoretical vanadium in the slag is 0.16% and 0.10% when the aluminum content is 8.0% and 20.0%,respectively.During the actual smelting process,the main materials of vanadium in corundum slag are composed of reduced FeV alloy as the primary phase and composite spinel structure of Mg(Al,V)2O4 and(Mn,Fe)V2O4 in the form of isomorphism.