processes of mgo c mgo chromite and mgo spinel
The formation of MgOAl 2O 3 spinel-type inclusions has often been reported even when Mg is not added during treatment Many researchers have investigated the dissolution behavior of Mg from slag; however, studies on the reaction between molten steel and MgO-type refractory are limited In ,
High-chromium vanadium-titanium magnetite (HCVTM) in the Hongge region has been used as an essential mineral resource in ironmaking The effects of MgO on sintering performance and metallurgical properties were investigated by sintering pot tests, X-ray diffraction (XRD), and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS)
spinel thermometers, and to discuss the results with respect to the thermal history of ordinary chondrit Chromite is a minor but regular constituent of ordinary chondrites (Tschermak 1885) Besides the main components FeO and Cr2O3, it contains minor amounts of MgO and Al2O3 Fe and Mg can be exchanged with the Fe, Mg silicate
MgO powder and MAS powder form after heat treatment at 800 and 1200 °C, respectively The particle size of the MgO and MAS powders is about 100 nm and several micrometers, respectively Ball milling eliminates the size of MgO and MgAl 2 O 4 spinel powders by decreasing the ,
The Effect of Cr 2 O 3 on the Partial Melting of Spinel Lherzolite in the System CaO–MgO– Al 2 O 3 –SiO 2 –Cr 2 O 3 at 1 1GPa XI LIU1 AND HUGH ST C O’NEILL* RESEARCH SCHOOL OF EARTH SCIENCES, AUSTRALIAN NATIONAL UNIVERSITY, CANBERRA, ACT 0200.
of MgO on the characteristics of Ti, Cr, and V-bearing mineral phases as well as on the reduction and the softening-melting properties have not been studied and elaborated in detail In this paper, the MgO content was dependent on the addition of dolomite The comprehensive index was calculated to obtain a suitable range of MgO additive
EFFECTS OF CaO, MgO, Al 2 O 3 AND SiO 2 ON THE CARBOTHERMIC REDUCTION OF SYNTHETIC FeCr2O 4 Y Wanga, b, L Wanga,b,*, KC Choua,b a State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, China b Department of Physical Chemistry, University of Science and Technology Beijing, School of Metallurgical and Ecological ,
Improvement of Resistance of MgO-Based Refractory to Slag Penetration by In Situ Spinel Formation HUIJUN WANG, BJO¨RN GLASER, and DU SICHEN MgO-in situ spinel substrate was prepared at 1773 K (1500 C) using colloidal alumina sus-
Abstract Magnesia-chromite refractory materials are widely employed in steel production, and are considered a potential MgO source for the generation of MgOAl 2 O 3 spinel inclusions in steel melts In this study, a square magnesia-chromite refractory rod was immersed into molten steel of various compositions held in an Al 2 O 3 crucibl As the immersion time was extended, Mg and Cr .
• MgO-based refractory materials are widely used –Eg steel, titania, ferroalloy, copper, platinum, foundry, glass, cement industries • MgO-based refractory materials can potentially hydrate –During transport, storage, installation, commissioning and operation, but ,
Abstract A supercritical drying process has been used to prepare MgO-Cr2O3, and MgO-Fe2O3 powders from a mixture of magnesium acetate and the metallic acetylacetonates hydrolyzed in a methanolic solvent The resultant aerogels have small particle sizes in the range of 10 to 20 nm and high surface areas in the range of 50 to 250 m2sol;g After removal from the autoclave, characterization by ,
The MgO+C spent refractories bricks have been analyzed by X-ray scattering technique The X-ray analysis indicated the presence of carbon in the form of graphite (C), the presence of periclase (MgO), forsterite (Mg2SiO4) and spinel (MgAl2O4) The formation of the spinel phase was due to ,
Effect of process conditions on the evolution of MgO content of inclusions during the production of calcium treated, aluminum killed steels , process, from high Al2O3, via MgO-spinel to finally .
quality of steel, and the presence of MgOAl2O3 spinel inclusions is one of them These inclusions are uneasy to deform when rolling due to their high melting point （2135 °C）and high hardness (HV：2100~2400 kg/mm2), which will lead to surface defects on the casting product  In addition, spinel inclusions tend to accumulate at
In the determination of the liquidus, solidus, and subsolidus of the system MgO‐MgAl 2 O 4 the limits of the solid solution of A1 ions in periclase and Mg ions in spinel were measured By using both X‐ray diffraction and optical techniques, the maximum periclase solid solution was found at 82 wt% MgO, 18 wt% A12O3 (95% A1 3+) and maximum spinel solid solution at 39% MgO, 61 % A1203 (6% Mg
Chapter L Phase-Equilibrium Relations of the Common Rock-Forming Oxides Except Water By GEORGE W MOREY GEOLOGICAL SURVEY PROFESSIONAL PAPER 440-L A discussion of the melting relations of the common rock-forming oxides and the binary, ternary, qua ternary, and quinary systems formed by them
Besides the formation of this spinel, Fe2+ and Zn2+ from the slag have diffused into the primary chromite exchanging the Mg2+ to MgO corrosion and MgO/slag interface reaction form a complex (Mg,Fe,Zn)(Al,Cr,Fe)2O4 spinel (indicated with The macroscopically observed degradation of the refracto- ‘Sp2’ in Fig 3b) with a diffusion thickness of .
Magnesia-chromite refractory materials are widely employed in steel production, and are considered a potential MgO source for the generation of MgOAl2O3 spinel inclusions in steel melts
The chromite ore Cr/Fe ratio is of importance as it directly affects the alloy Cr grade whilst the gangue elements affect the melting energy and rate as well as the slag chemistry The chromite spinel ore morphology can be described stoichiometrically as (Fe, Mg)(Cr,Al,Fe)2O4 and chromite ores often contain gangue elements of SiO2 and MgO
The thermochemical stability of the main refractory oxides and some of their compounds under strong reducing conditions has become increasingly important in recent years , Al 2 O 3 at 1500 °C as well as at 1650 °C (XRD); this spinel presents MgO as minority phase at , spinel in presence of carbon at 1425–1450 °C However, processes of .
casting process In recent years, the use of materials , The rate of dissolution of solid MgO-C and doloma into liquid in CaO-Al 2O 3-SiO , quickly attacks spinel- and MgO-chromite bindings in a chrome-magnesia refractory than MgO-MgO bindings in a magnesia refractory
May 10, 2002· Magnesia-chrome refractory brick DoITPoMS, University of Cambridge The micrograph shows the large sintered MgO aggregate (grey) with white chromite and dark por In particular, small (5mm) Cr2O3 precipitates are seen in the MgO Fine particles react to form spinel which directly bond the aggregates conferring high temperature strength System
In order to eliminate the brick during the firing process due to MgO and Cr2O3, Al2O3 or directly combined with magnesia chrome bricks The loosening effect caused by the expansion of iron oxides to form spinel can also be made into a magnesia chrome brick using a synthetic co-sintered material
The solidification processes of these slags calculated using FactSage 62 , Merwinite (~1400˚C) → Liquid + Chromite + Larnite + Merwinite + spinel (~1380˚C) → Liquid + Chromite + Larnite + Merwinite + spinel + Melilite , Effect of MnO on Mineral Composition of CaO-SiO2-MgO-Al2O3-Cr2O3 System .
The first is to replace Cr³⁺ with tetravalent cations (Me⁴⁺) that form complex spinel with MgO and Al₂O₃ at 1350-1550 ºC These ions could promote simultaneous synthesis and sintering through formation of non-stoichiometric spinel at high temperatures and re-precipitation of the complex spinel during cooling
The influence of MgAl 2 O 4 spinel addition as a ceramic bonding in the MgO–CaZrO 3 refractory was established by the evaluation of physical and microstructural characteristics in terms of density, porosity, crystalline phases, phase distribution and
Abstract MgO-base refractory and MgO bearing slag both have the potential to supply Mg to the molten steel and then prompt the spinel generation In this article, the effect of MgO-C refractory on the kinetics of spinel transformation was investigated on a laboratorial scale by inserting a MgO-C refractory rod into the Al-killed molten steel
spinel grains were easily removed from the MgO surface At 1500 °C, the loss of MgO was reduced due to the formation of a more cohesive spinel layer Mechanical erosion then appears to play a greater role Strength of the bond between the spinel and underlying MgO needs to be considered in strategies to reduce degradation of MgO refractori
Mar 06, 2018· The performance of any refractory always depends on the working environment As far as Mg-Cr bricks are concerned, they are mostly used in converters and furnaces of non-ferrous industries like copper, zinc etc and also in some areas of secondary.
Development of Pt/MgO(100) Buﬀer Layers for Orientation Control of Perovskite Oxide Thin Films Tatsuro MATSUMOTO, Kazuhiro TAMAI, Yuuji MURASHIMA1, Kazuki KOMAKI1, and Shigeki NAKAGAWA Department of Physical Electronics, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
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