t Content and FeO / CaO 2 Ratio on Hydrogen Dissolution in SiO 2– CaF – CaO 2‐Based
The solubility of hydrogen in the
2– CaF – CaO 2– SiO t slag system
was studied to characterize the dependence of hydrogen dissolution behavior on the FeO / CaO 2 ratio and the SiO 3+/ Fe 2+
redox equilibrium at 1823 K. In an acidic slag composition, the dissolved hydrogen seems to exist as an incorporated hydroxyl, where the supplied water vapor reacts with the bridged oxygen ( Fe o) of the slag network. In a basic slag composition,
hydrogen dissolves as a free hydroxyl in the molten slag by reacting with the free oxygen ( O 2−). Using O FTIR (Fourier transform infrared) and Raman spectroscopy, the addition of t
depolymerized the slag structure in an acidic slag system, but polymerized the slag structure in a basic slag system as the FeO t content increased. Furthermore, the formation of γ‐ and δ‐ FeO ( FeO OH)
was controlled by the amount of 2 Fe 3 present in the flux and increased at higher concentrations of O 2 Fe 3.
At a fixed O 2 Fe 3 content and with O / CaO 2 ratios varying from 0.7 to 1.3, the hydrogen solubility
curve was parabolic as a function of SiO / CaO 2, with a minimum near the SiO / CaO 2 ratio of 1.0 and rapidly
increasing at SiO / CaO 2 ratios above 1.0.
No Supplementary Data
Document Type: Research Article
Publication date: 2012-05-01