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Phase Diagrams and Thermodynamic Properties of the FeO–SiO 2 –V 2 O 3 Systems
Author(s) -
Huang Weijun,
Chen Min,
Shen Xiang,
Yu Shan,
Wang Nan,
Xu Lei
Publication year - 2017
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201600324
Subject(s) - tridymite , wüstite , spinel , eutectic system , isothermal process , materials science , phase diagram , thermodynamics , cristobalite , phase (matter) , ternary operation , vanadium , ternary numeral system , analytical chemistry (journal) , metallurgy , oxide , chemistry , microstructure , chromatography , quartz , physics , organic chemistry , computer science , programming language
The phase diagrams of FeO–SiO 2 –V 2 O 3 systems as the main components of vanadium slag are assessed on the basis of the existing literature models and experimental studies to modify partial parameters by FactSage thermodynamic software. The results show that the eutectic and peritectic reactions for the FeO–V 2 O 3 system happen at about 1626 and 1985 K, respectively. The eutectic and monotectic reactions for the V 2 O 3 –SiO 2 system happen at about 1935 and 1963 K, respectively. According to the actual blowing temperature of the vanadium‐extraction converter, the isothermal section at 1573, 1623, and 1672 K of the FeO–SiO 2 –V 2 O 3 ternary system is calculated, and the isothermal section at 1573 and 1623 K has seven phase regions, which are the liquid + spinel + tridymite, liquid + wustite + spinel, spinel + tridymite + karelianite, liquid + tridymite, liquid + spinel, liquid + wustite, and liquid, respectively. But liquid + wustite and liquid + wustite + spinel regions disappear at 1673 K. Meanwhile, two ternary eutectic points are determined to be at 1470 and 1476 K, respectively. Peritectic reaction of phase wustite, karelianite, and silica (tridymite and cristobalite) occurs at 1702 and 1750 K, respectively.