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Phase Evolution Behavior and Oxidation Induration Mechanism of High-Chromium Vanadium–Titanium Magnetite Flux Pellets
- Source :
- Metallurgical and Materials Transactions B. 53:178-189
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- The quality of vanadium–titanium magnetite sinters is poor. The high-pellet operation of the blast furnace ironmaking process is a feasible method for utilization of the High-chromium Vanadium–titanium magnetite (HVTM). To ensure the basicity of the burden, flux pellets need to be investigated. In this study, HVTM concentrate and CaCO3 were used to prepare flux pellets. The phase transition and oxidation induration mechanism of flux pellets were studied separately and analyzed by scanning electron microscopy and energy dispersive spectroscopy. Solid-phase and solid–liquid-phase experiments were used to verify the phase transition behavior. The results indicated that the basicity (CaO/SiO2) increased from 0.4 to 1.4, and the compressive strength of HVTM concentrate flux pellets first increased to 4916 N and then decreased to 2399 N at 1523 K for 20 minute. The porosity of the pellets increased from 8.236 to 20.734 pct. Perovskite produced due to increasing basicity reduced the slag content and had a low bonding strength, which reduced the overall compressive strength of the pellets. The increasing basicity was conducive to the solid solution of Ti forming an iron-titanium solid solution. The addition of CaCO3 increased the porosity of the pellets. The oxidation induration of the pellets changed from oxide-bonded to slag-bonded.
- Subjects :
- Materials science
digestive, oral, and skin physiology
Metals and Alloys
Pellets
Vanadium
chemistry.chemical_element
Slag
Condensed Matter Physics
chemistry.chemical_compound
Chromium
Compressive strength
chemistry
Chemical engineering
Mechanics of Materials
visual_art
Materials Chemistry
visual_art.visual_art_medium
Porosity
Magnetite
Titanium
Subjects
Details
- ISSN :
- 15431916 and 10735615
- Volume :
- 53
- Database :
- OpenAIRE
- Journal :
- Metallurgical and Materials Transactions B
- Accession number :
- edsair.doi...........88998fac34de85b45f1715b6052377ba