(PDF) Oxidation Resistance and Wetting Behavior of MgO-C
Schematic experimental setup of the wetting process. 1 Recorder 2 High speed camera 3 Quartz window 4 Gas inlet 5 Furnace 6 Alumina tube 7 Stage 8 MgO-C refractory 9 Slag 10 Heating
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RefractoryWikipedia
A refractory material or refractory is a material that is resistant to decomposition by heat pressure or chemical attack and retains strength and form at high temperatures. Refractories are polycrystalline polyphase inorganic nonmetallic porous and heterogeneous. They are typically composed of oxides or non oxides like carbides nitrides etc. of the following materials silicon
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Alumina and its Role in Iron and SteelmakingIspatGuru
Sep 08 2017 · MgO helps in the maintenance of good slag drainage from the hearth during tapping. As the level of MgO increases in the high alumina slag the sulphur content of hot metal improves for a given range of silicon. This is probably due to the higher fluidity of the high MgO slag. High MgO slag is advantageous for the control of both sulphur and
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Jul 17 2019 · Field use also shows that Al2O3-MgO-C bricks have a higher service life than high-aluminum bricks and are therefore widely used to refine refractory materials in low
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Interaction between MgO–C-bricks and ladle slag with a 1 1
The effect of the high-density MgO layer formation and the purity of MgO-grains on the degradation of low-carbon MgO–C refractory due to high alumina stainless slag was also investigated 5 .
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Industry NewsRefractory
Industry News Properties of AMC refractories AMC refractories are developed on the basis of high-performance magnesia and aluminium carbonaceous refractories which are also an alternative material to high-alumina and dolomite brick ladle lining. But in contrast made by acid-based two kinds of fire-resistant oxides the aluminum-magnesium-carbon brick not only has excellent
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Corrosion Behavior of Alumina Containing Refractory in
As the main resource of nickel some high-alumina laterite ores are smelted in blast furnace to produce nickel-containing hot metal. The blast furnace slag with Corrosion Behavior of Alumina Containing Refractory in Blast Furnace Hearth by CaO–SiO 2–MgO–Al 2O 3–Cr 2O 3 Slags Renze XU 1) ZHANG 1 2) Zushu LI3 4) and Yongan ZHAO5)
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Corrosion of MgO-C with Magnesium Aluminate Spinel
MgO-C exhibits excellent slag penetration resistance due to the non-wetting property of carbon. The combination of this good corrosion resistance with the high thermal shock resistance low thermal expansion high thermal conductivity and high toughness makes it a superior refractory material for the
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Oxidation Resistance and Wetting Behavior of MgO-C
Carbon plays an important role in improving the thermal shock resistance and the slag corrosion resistance of the MgO-C refractory due to its low thermal expansion coefficient and its poor wettability with slag .However carbon is susceptible to oxidation particularly in high temperatures which is classified into direct (Equation (1)) and indirect oxidation (Equation (2)).
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(PDF) Microstructure evaluation of MgO–C refractories with
Fig. 9 .9Model-composition II coked at 1500 • C in air and sealed by carbon in an alumina crucible TiCN grains and TiCN agglomerates. Fig. 10 .10Oxidation tests at 1200 • C for 3 h in air of MgO-C samples coked at 1000 • C in air and sealed by carbon in an alumina
Get PriceOxidation Resistance and Wetting Behavior of MgO-C
Carbon plays an important role in improving the thermal shock resistance and the slag corrosion resistance of the MgO-C refractory due to its low thermal expansion coefficient and its poor wettability with slag .However carbon is susceptible to oxidation particularly in high temperatures which is classified into direct (Equation (1)) and indirect oxidation (Equation (2)).
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AbstractsUNITECR 2017
o72) constraining effects on high-alumina calcium magnesium aluminate-bonded castables for steel ladles .. 69 o73) use of ultra low carbon content magnesia-carbon products for the production of low carbon content special and stainless steels. 69
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Magnesia Carbon BrickRS Kiln Refractory Bricks
Magnesia Carbon Brick Introduction. Magnesia carbon bricks(MgO-C brick) are mainly made of high-melting-point basic oxide magnesia and high-melting-point carbon material and added in various non-oxide additives through high-pressure molding and low-temperature treatment magnesite carbon bricks are widely used in electric furnace lining owing to the characteristics of high temperature
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A Comprehensive Review of Recent Advances in Magnesia
The paper describes state of the art developments in the formulation of MgO-C refractories products that have been an integral part of the iron and steel industry over the last two decades. The effects of important techniques and variations in operational parameters are reviewed and summarized including the impact of antioxidants on oxidation behaviour incorporation of graphite or nano
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Corrosion of refractories and ceramic materials
Refractory materials Magnesite (>60 MgO) Steel furnaces Magnesia-carbon High wear resistance in steel industry Chrome-magnesite Wall lining in Siemens-Martin steel furnaces Magnesia-alumina Cement furnace linings crucible linings for steel Dl itDolomite (CMCaMg)(CO 3) Sl i t t li iSlag resistant lining Forsterite (2MgO-SiO 2) Furnace lining Chamotte Cheap lining mediumCheap lining medium
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Industry NewsRefractory
Industry News Properties of AMC refractories AMC refractories are developed on the basis of high-performance magnesia and aluminium carbonaceous refractories which are also an alternative material to high-alumina and dolomite brick ladle lining. But in contrast made by acid-based two kinds of fire-resistant oxides the aluminum-magnesium-carbon brick not only has excellent
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Oxidation Mechanism of C in MgO–C Refractory Bricks
Olena Volkova Piotr R. Scheller Bernd Lychatz Kinetics and Thermodynamics of Carbon Isothermal and Non-isothermal Oxidation in MgO-C Refractory with Different Air Flow Metallurgical and Materials Transactions B 10.1007/sy 45 5 () (2014).
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Low carbon containing Al2O3-C refractories with nanocarbon
Jun 01 2020 · But the use of high carbon content leads to several disadvantages like carbon pickup by steel high heat loss and generation of higher extent of CO x gases etc. Hence the development of low carbon Al 2 O 3-C refractories without conceding any beneficial properties is the challenge to the refractory technologists. Such a challenge is intended
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Ceramics Free Full-Text Corrosion of MgO-C with
In MgO-C slag penetration decreases with increasing alumina content due to (a) spinel formation (b) formation of aluminum nitride phases and aluminum carbide (Al 4 C 3) which reduce oxidation of carbon and (c) an increase of slag viscosity by reaction of Al 2 O 3 with slag compounds like SiO 2 and CaO 7 .
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Degradation mechanism of Cr2O3‐Al2O3‐ZrO2 refractories in a coal‐water slurry gasifier Role of stress cracks Extended studies on surface‐treated graphite vis‐à‐vis its application in high alumina refractory castable. Improved properties of low‐carbon MgO‐C refractories with the addition of multilayer graphene/MgAl2O4
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Corrosion Behavior of Alumina Containing Refractory in
As the main resource of nickel some high-alumina laterite ores are smelted in blast furnace to produce nickel-containing hot metal. The blast furnace slag with Corrosion Behavior of Alumina Containing Refractory in Blast Furnace Hearth by CaO–SiO 2–MgO–Al 2O 3–Cr 2O 3 Slags Renze XU 1) ZHANG 1 2) Zushu LI3 4) and Yongan ZHAO5)
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Degradation of low-carbon MgO-C refractory by high-alumina
The effect of the high-density MgO layer formation and the purity of MgO-grains on the degradation of low-carbon MgO-C refractory due to high alumina stainless slag was also investigated.
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Degradation mechanisms of magnesia-carbon refractories by
Aug 01 2007 · The degradation mechanisms are characterised by various combinations of slag infiltration direct MgO dissolution into the penetrated slag erosion of periclase grains at elevated temperature MgO-C reaction and extrinsic oxidation of refractory carbon by reducible slag components (e.g. FeO x CrO x).
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Thermal and mechanical properties of commercial MgO-C bricks
MgO-C (magnesia-carbon) refractory bricks are widely used in steel industry the primary consumer of refractory linings such as basic oxygen furnaces electric arc furnaces and ladle furnaces. The steelmaking requires extreme chemical thermal and mechanical conditions that demand a high performance of materials able to withstand the action
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RefractoryWikipedia
A refractory material or refractory is a material that is resistant to decomposition by heat pressure or chemical attack and retains strength and form at high temperatures. Refractories are polycrystalline polyphase inorganic nonmetallic porous and heterogeneous. They are typically composed of oxides or non oxides like carbides nitrides etc. of the following materials silicon
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Alumina (HA) Bricks Gita Refractories
High-alumina refractories are made from bauxite a naturally occurring material containing aluminum hydroxide Al(OH)3 kaolinitic clays. These raw materials are roasted to produce a mixture of synthetic alumina mullite (an aluminosilicate mineral with the chemical formula 3Al2O32SiO2).
Get PriceDevelopment of an Ultra-Low Carbon MgO Refractory Doped
The effect of α-Al2O3 nanoparticles (up to 5 wt. ) on the physical mechanical and thermal properties as well as on the microstructural evolution of a dense magnesia refractory is studied. Sintering temperatures at 1300 1500 and 1600 °C are used. The physical properties of interest were bulk density and apparent porosity which were evaluated by the Archimedes method.
Get PriceThermal and mechanical properties of commercial MgO-C bricks
MgO-C (magnesia-carbon) refractory bricks are widely used in steel industry the primary consumer of refractory linings such as basic oxygen furnaces electric arc furnaces and ladle furnaces. The steelmaking requires extreme chemical thermal and mechanical conditions that demand a high performance of materials able to withstand the action
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Degradation of low‐carbon MgO‐C refractory by high‐alumina
Mar 16 2017 · A new type of low‐carbon magnesia carbon refractory (LCMCR) substituting for MgO‐Cr 2 O 3 refractory was successfully used in vacuum oxygen decarburization (VOD) ladle slagline and the composition and microstructure of the used LCMCR were investigated. The results indicated that the decarburizing reaction (MgO‐C reaction) in the LCMCR under the VOD refining condition (high
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