improvement of resistance of mgo based refractory to
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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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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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·Al2O3 and CaO·MgO·Al2O3 solid phases at the
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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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The results confirmed that the mineral phases microstructure and liquid formation at a high temperature of the refractory materials had a strong impact on the corrosion resistance. The slag resistance was significantly improved when the cement was replaced by the cement-free binders.
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Improvement of Resistance of MgO-Based Refractory to Slag Penetration by In Situ Spinel Formation Wang Huijun KTH School of Industrial Engineering and Management (ITM) Materials Science and Engineering Micro-Modelling.
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(3) The MgO-CaO combination has a larger two-sided angle than the MgO-MgO combination which is beneficial to improve the resistance to slag permeability and resistance to slag corrosion. The thermal shock resistance of magnesium-calcium-based materials is better than that of magnesium-chromium-based materials.
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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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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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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.
Get PriceImprovement 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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MgO-C refractory as a foaming slag conditioner because of their MgO content. Crushed MgO-C spent refractories can be reused directly back into an EAF without complex and costly beneficiation. Even though this practice is simple it is critical to know the optimum amount of MgO in the slag to achieve the best foaming quality.
Get PriceA Study on the Reaction between MgO Based Refractories and
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·Al2O3 and CaO·MgO·Al2O3 solid phases at the
Get PriceA Study on the Reaction between MgO Based Refractories and
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·Al2O3 and CaO·MgO·Al2O3 solid phases at the
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Based on these it can be concluded that an MgO–C refractory with a higher carbon content would have better resistance against crack propagation after initiation but would not show obvious improvement in its resistance against crack initiation. KEY WORDS MgO–C refractory stress intensity factor fracture mechanics crack growth compliance
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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- pension and coarse MgO as raw materials.
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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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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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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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Steel Ladle Al2O3-MgO-C Refractory Description With the rapid development of steel smelting technique especially with the application of continuous casting and out furnace refining techniques the requirement on ladle refractory material is much higher. So chemical corrosion resistant scouring resistant slag erosion resistant thermal shock resistant and high mechanical strength refractory
Get Priceurn nbn se kth diva Improvement of Resistance of
Improvement of Resistance of MgO-Based Refractory to Slag Penetration by In Situ Spinel Formation Wang Huijun KTH School of Industrial Engineering and Management (ITM) Materials Science and Engineering Micro-Modelling.
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There are three types of refractory for reduction furnaces. 1. MgO-C refractory material. 2. MgO-Cr 2 O 3 refractory material. 3. Al 2 O 3-C refractory material. 1) MgO-C refractory material The main reason for the damage of MgO-C bricks is the melting reaction of MgO aggregate and the decarburization reaction of carbon matrix caused by gas phase liquid phase oxidation reaction and MgO-C
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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).
Get PriceA 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
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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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
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