Premium
Experimental Study of Phase Equilibria in CaO–SiO 2 –MgO–Al 2 O 3 –V 2 O 3 Slags
Author(s) -
Yang Yang,
Teng Lidong,
Seetharaman Seshadri
Publication year - 2014
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.201400017
Subject(s) - vanadium , partial pressure , slag (welding) , analytical chemistry (journal) , phase (matter) , oxygen , scanning electron microscope , materials science , alloy , vanadium oxide , metallurgy , solid solution , atmospheric temperature range , chemistry , thermodynamics , organic chemistry , composite material , physics , chromatography
Thermodynamic data with regard to slags containing vanadium oxide are scarce and scattered. In the present study, the classic gas‐slag equilibrium technique has been adopted to investigate the phase relationships in the CaOSiO 2 MgOAl 2 O 3 V 2 O 3 slags. The phase equilibria in the slag systems in the temperature range of 1773–1823 K (1500–1550 °C) at oxygen partial pressures of 10 −5 Pa and 0.21 × 10 5 Pa were characterized. CaVO 3 was precipitated in samples with basicity 1.5 and 1.8 treated in air at 1773 K (1550 °C) while all vanadium was dissolved in equilibrium phases in samples treated at oxygen partial pressure of 10 −5 Pa. Vanadium distribution between the slags and solid Pt and phase compositions were analyzed using scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and X‐ray diffractomer (XRD) techniques. The effects of temperature, oxygen partial pressure, and slag basicity on the phase compositions in the slags are presented. Activities of VO 1.5 were also calculated using the value of vanadium activity in the Pt–V alloy.