Investigations on the properties of Al2O3–MgO refractory
Aug 15 2018 · In this paper the properties including strengths oxidation resistance as well as corrosion resistance of Al 2 O 3 –MgO refractory castables bonded with Secar71 carbon back/S
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A Review on Recent Advances on Magnesia-Doloma
resistance MgO-CaO refractories are widely used in ferrous non-ferrous and cement industries. However in spite of these advantageous properties the application of MgO-CaO refractory bricks have not been popular due to their tendency to hydration when exposed to the atmosphere 5-10 . Recently Nano-technology was introduced to
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USB2Synthetic refractory material for
A material for refractory shaped bodies or compounds the material being a pleonaste and/or a spinel of the pleonaste type. In addition to FeO x and Al 2 O 3 the material also includes MgO. The ratio of the iron in the material is calculated as Fe 2 O 3 Al 2 O 3 and ranges from 30 70 to 60 40. The material contains from 20 to 60 by mass of MgO as based on Fe 2 O 3 Al 2 O 3 .
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Mechanisms of Drug Resistance in Relapse and Refractory
Multiple myeloma (MM) is a hematological malignancy that remains incurable because most patients eventually relapse or become refractory to current treatments. Although the treatments have improved the major problem in MM is resistance to therapy. Clonal evolution of MM cells and bone marrow microenvironment changes contribute to drug resistance.
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EXPANDED GRAPHITE FORTIFIED MAGNESIA-CARBON
1.2 MgO-C Refractory MgO-C brick is a composite material based on MgO and C and bonded with high carbon containing pitch and resin with some metallic powder as anti-oxidants to protect the carbon. MgO-C bricks are made by high pressure. These bricks show excellent resistance to thermal shock and slag corrosion at elevated temperatures.
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Basic Shaped RefractoriesIspatGuru
Based on the conditions used and the quality of the raw materials this can produce materials with MgO contents between around 85 to 98 . For refractory applications besides MgO lime silica and iron contents are also critical.
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Microsilica-bonded magnesia-based refractory castables
submicrometric particles necessary to improve the flow of the castable and to improve the bond of the castable. The three acids are very effective in inhibiting the formation of magnesium hydroxide but affect negatively flow properties and mechanical resistance after cure.
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A Review on Recent Advances on Magnesia-Doloma
resistance MgO-CaO refractories are widely used in ferrous non-ferrous and cement industries. However in spite of these advantageous properties the application of MgO-CaO refractory bricks have not been popular due to their tendency to hydration when exposed to the atmosphere 5-10 . Recently Nano-technology was introduced to
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Improvement of oxidation resistance in graphite for MgO
Improvement of oxidation resistance in graphite for MgO−C refractory through surface modification Geun-Ho CHO 1 Eun-Hee KIM 1 Jing LI Je-Hyun LEE Yeon-Gil JUNG Yun-Ki BYEUN 2 Chang-Yong JO3 1. School of Materials Engineering Changwon National University Changwon Gyeongnam Korea 2.
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Improvement of the refractory lining in the LD- converter
A main part to increase the production in the steel plant was to improve the refractory lifetime of the LD converters. The preparation of Al-AlN bonded corundum based refractory by in situ reaction. Zhu Boquan / Fang Binxiang Ladle heating procedure and its influence on the oxidation resistance of MgO-C refractories. Volkova Olena
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Corrosion mechanism and kinetic behaviour of refractory
resistance is also affected by the refractory porosity. A porous refractory is easily corroded by the slag which soaks into the pores whereas a dense single-phase refractory dissolves only slowly. The binding matrix is more rapidly attacked than the solid grains causing them to become loose and dispersed in the slag without actually dissolving.
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New trends in monolithic refractoriesBioKeram
Due to their high refractoriness mechanical strength thermal shock and corrosion resistance MA (MgAl2O4) spinel containing refractories are increasingly finding new applications and new types of spinel-containing refractories are being developed.
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New trends in monolithic refractoriesBioKeram
Due to their high refractoriness mechanical strength thermal shock and corrosion resistance MA (MgAl2O4) spinel containing refractories are increasingly finding new applications and new types of spinel-containing refractories are being developed.
Get PriceImprovement in Slag Resistance of No-Cement Refractory
Due to the excellent corrosion resistance to basic slags and good thermo-mechanical properties either in situ forming or pre-formed spinel (MgAl2O4) containing cement bonded refractory castables (low cement castables (LCCs)) have been widely used for steel ladles.
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A refractory composition which is suitable for forming a sliding gate to be used at the bottom of a ladle or tundish is provided. The refractory composition comprises 10 to 30 parts by weight of an alumina-magnesia spinel material containing 40 to 70 by weight of Al 2 O 3 25 to 60 by weight of MgO and 10 or less of impurities and 70 to 90 parts by weight of a magnesia material containing
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Improvement of Resistance of MgO-Based Refractory to Slag
Jan 06 2015 · As a substitute of carbon-bonding MgO·Al 2 O 3 spinel offers a good improvement in both physical and chemical properties of MgO-based refractories such as densification slag penetration resistance and thermal shock resistance. 10 A A number of researchers have focused on the corrosion behavior between spinel-MgO and slag.
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Papersrefractories-worldforum
Keywords MgO castables additives self-flowing microsilica gel-bond. Abstract References Full Article New Additive Packages for Self-flowing High-alumina and MgO Based Refractory Castables. Hong Peng Bjørn Myhre. Volume 5 Issue 2 Pages 99104
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Improvement in Slag Resistance of No-Cement Refractory
Due to the excellent corrosion resistance to basic slags and good thermo-mechanical properties either in situ forming or pre-formed spinel (MgAl2O4) containing cement bonded refractory castables (low cement castables (LCCs)) have been widely used for steel ladles.
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Production of MgO-X Refractory Material with Cellular
The oxidation resistance of the MgO-C refractory bricks with CaB 6 and Al or Al-Mg alloys is improved because a layer of low porosity is formed in the surface of the material. This layer constitutes mainly of MgO B 2 O 3 formed from MgO reaction with B 2 O 3 16 . The main benefit of the addition of more than one species of anti-oxidant is the
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Corrosion resistance of MgO–C refractory to smelting
Abstract. Interactions between smelting reduction slags containing titania (0·2-20 wt- TiO 2) and MgO-C refractories have been investigated by stationary immersion and rotary immersion at temperatures of K.The relationship between the concentration of TiO 2 in the slag and the corrosion rate of the refractories the effects of slag basicity (CaO/SiO 2) and the effect of the
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Gastroenterology 1831 CLINICAL PRACTICE UPDATE
antibiotic to which H pylori demonstrates in vitro resistance is included in the regimen. Combining studies of both treatment naïve and refractory H pylori infection in vitro resistance to clarithromycin and levofloxacin are associated with a 7.0-fold (95 CI 5.2–9.3-fold) and 8.2-fold (95 CI
Get PriceAnalysis and Prediction of Corrosion of Refractory
Oct 23 2020 · Yoshikawa et al. 11 studied the erosion resistance of MgO-based spinel and Al 2 O 3 -based spinel refractories and found that these two refractories can replace Al 2 O 3 -Cr 2 O 3 refractories with low chromium content and are more suitable for alkali furnaces.
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Investigations on the properties of Al2O3–MgO refractory
Aug 15 2018 · Nowadays steel ladle linings below the slag line are usually casted by the calcium aluminate cement bonded Al 2 O 3 –MgO refractory castables due to their improved corrosion resistance and slag penetration resistance associated with the in situ formation of MgAl 2 O 4 spinel in the refractory castables 1–4 but the other parts are constructed with MgO–C refractory bricks.
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Production and properties of refractory raw materials
this reason refractory materials based on andalusite either raw or calcined exhibit porosity significantly lower than bauxite or chamotte. When applied in castables this specific behavior of andalusite results in an improved corrosion resistance as well as a lower water demand.
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Oxidation Mechanism of C in MgO–C Refractory Bricks
Hassan Gheisari Dehsheikh Salman Ghasemi-Kahrizsangi Performance improvement of MgO-C refractory bricks by the addition of Nano-ZrSiO 4 Materials Chemistry and Physics 10.1016/j.matchemphys.2017.09.055 202 () (2017).
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Analysis and Prediction of Corrosion of Refractory
Oct 23 2020 · Yoshikawa et al. 11 studied the erosion resistance of MgO-based spinel and Al 2 O 3 -based spinel refractories and found that these two refractories can replace Al 2 O 3 -Cr 2 O 3 refractories with low chromium content and are more suitable for alkali furnaces.
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Improvement of Resistance to Slag Penetration in Magnesia
The results showed that the alumina addition greatly improved the resistance of MgO based refractory against slag penetration in comparison with the decarburized MgO-carbon refractory. It was found that the improvement of resistance was mainly related to the spinel-slag reaction products of CaO·Al 2 O 3 and CaO·MgO·Al 2 O 3 solid phases at
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Improvement of Resistance to Slag Penetration in Magnesia
Jun 01 2016 · By addition of colloidal alumina three different particle sizes of dead burnt MgO were employed as raw materials to prepare MgO-based spinel substrates at 1773 K (1500 °C). It was found that the particle size of MgO as well as its size distribution had substantial impact on the resistance of the refractory to the slag penetration at 1873 K (1600 °C).
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Production and properties of refractory raw materials
this reason refractory materials based on andalusite either raw or calcined exhibit porosity significantly lower than bauxite or chamotte. When applied in castables this specific behavior of andalusite results in an improved corrosion resistance as well as a lower water demand.
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