Corrosion Mechanism of MgO–CMA–C Ladle Brick with
nesia refractories has been developed which contain calcium magnesium aluminate (CMA) cement binder or aggregates to increase the high-temperature properties and corrosion resis-tance by incorporation of magnesium aluminate spinel. 11–13 The physical and thermomechanical properties of MgO–CMA–C refractories are similar to those of common
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Influence of magnesium aluminate spinel powder content on
· The effect of the amount of magnesium aluminate spinel powder (MASP) in lightweight periclase-spinel refractories on the cement clinker corrosion and adherence properties was investigated by the static crucible test and sandwich test. The results showed that MASP addition significantly affected the cement clinker corrosion resistance and adherence
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Magnesium aluminate spinel raw materials for high
These combined factors have led to a resurgence in interest in magnesium aluminate spinel raw materials. Magnesium aluminate spinels have been used in steel-making refractories for many years in a variety of different forms. This paper reviews the production properties and performance of spinels.
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Impact of Melt Phase Formation on the High
· magnesium aluminate spinel raw materials their grain size as well as the carbonization temperature on the properties of MgO–C with carboncontent of 3 5 . However despite the outstanding corrosion resist ance melt phase formation is likely to oc cur at operating temperature through the interaction of MgO and its impurities with
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Influence of Nanocrystalline MgAl2O4 Spinel Addition on
· Nanopowders of magnesium aluminate (MgAl 2 O 4) spinel prepared through citrate-nitrate gel method and calcined at 800°C were incorporated to the matrix of magnesia-carbon (MgO-C) refractory.The physical and chemical properties of the nano-MgAl 2 O 4 spinel-added (0.5 and 1.0 wt ) MgO-C bricks were compared with those of MgO-C bricks containing no spinel and commercially
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Corrosion of MgO-C with Magnesium Aluminate Spinel
· alumina and doloma refractories have been proven 4 . Spinel contributes with its high refractoriness high resistance to slag penetration and corrosion and high thermal shock resistance 6 . In MgO-C slag penetration decreases with increasing alumina content due to (a) spinel
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Corrosion Mechanisms of Different Refractory Aggregates in
· The corrosion and penetration mechanisms of slag on tabular alumina aggregates and lightweight alumina aggregates were similar to the reactions of the brown fused alumina aggregates. Due to the reaction of MgO and Al 2 O 3 in the aggregate magnesium aluminate spinel was formed. This was accompanied by a certain volume expansion which caused
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Slag Corrosion and Penetration Behaviors of MgAl 2 O 4 and
· The slag corrosion and penetration behaviors of MgAl2O4 MgAl2O4–ZrO2 MgAl2O4–ZrO2–CaO Al2O3 and Al2O3–ZrO2–SiC refractories were investigated using the static crucible method at 1873 K for 2 h. The above refractories all displayed excellent slag corrosion resistance and their corrosion depth was less than 1.10 mm. Al2O3 material was hardly corroded by
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Preparation of magnesium aluminate spinel by auto
· Preparation of magnesium aluminate spinel by auto combustion route using glycine as fuel and densification study with Cr 2 O 3 because of its resistant to corrosion by slag. Alumina rich or magnesia rich matrix is suitable for refractories. The free magnesia will react with available alumina to form secondary spinel.
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Papersrefractories-worldforum
· Improved Thermal Shock Resistance of Magnesium Aluminate Spinel Ceramics by Aluminium Titanate Additions. Kirsten Moritz Christos G. Aneziris. Volume 8 Issue 2 Pages 6773. Keywords magnesium aluminate spinel aluminum titanate thermal shock resistance dynamic Young s modulus. Abstract References Full Article
Get PriceStudy of Spinel-Containing High Alumina Castable with
· High alumina castable with presynthesized and in situ spinel formation is studied using two different lime-containing high alumina cements. Vibratable castable compositions were studied by conventional processing using a distribution coefficient of 0.29 and heat treatments at 110 900 and 1500°C. Slightly lower density and strength values were found for in situ spinel-forming compositions
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New periclase-magnesium aluminate spinel refractories from
· The chemistry and distribution of phases formed in a set of six laboratory-prepared magnesia-magnesium aluminate spinel ceramics and in three of their precursor spinel-based compositions sintered at 1600°C and 1760°C respectively are examined and compared. The evaluation of the results is the basis for the industry design of magnesia spinel refractories for new advanced
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Influence of Nanocrystalline MgAl2O4 Spinel Addition on
· Nanopowders of magnesium aluminate (MgAl 2 O 4) spinel prepared through citrate-nitrate gel method and calcined at 800°C were incorporated to the matrix of magnesia-carbon (MgO-C) refractory.The physical and chemical properties of the nano-MgAl 2 O 4 spinel-added (0.5 and 1.0 wt ) MgO-C bricks were compared with those of MgO-C bricks containing no spinel and commercially
Get PriceCorrosion of magnesium aluminate spinel-rich refractories
· Abstract. Magnesium aluminate spinel-containing refractories are widely used as steel ladle linings and represent potential materials for other high temperature processes. In gasifiers the refractories are in contact with calcium aluminosilicate-rich slags with high content of iron and sulphur. The effect of sulphur on the corrosion of spinel-rich
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EFFECT OF MICRON AND NANO MgAl O SPINEL
· Magnesium aluminate (MgAl2O4) spinel has been (AR-90) and magnesia rich (MR-66) have been used during fabrication of MgO-C bricks. Micron-sized spinel added MgO-C bricks with sixteen Fig. 2.1 Different phenomena of corrosion in refractories 17 Fig. 2.2 Different penetration conditions of slag in refractory 18
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Corrosion of high alumina spinel castables by steel ladle
Abstract The application of high alumina materials with additions of spinel and/or spinel forming magnesia as wear linings in steel ladles has increased in recent years. Resistance to steel slag is the most important criterion when selecting a suitable material. In the present study two different high alumina spinel castable refractories were examined for their wear resistance against steel
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Corrosion of high alumina spinel castables by steel ladle
Abstract The application of high alumina materials with additions of spinel and/or spinel forming magnesia as wear linings in steel ladles has increased in recent years. Resistance to steel slag is the most important criterion when selecting a suitable material. In the present study two different high alumina spinel castable refractories were examined for their wear resistance against steel
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Corrosion of magnesium aluminate spinel-rich refractories
The effect of sulphur on the corrosion of spinel-rich castables has been investigated and analyzed by EDX and EBSD in SEM. In contact with coal slag at 1450 °C a spinel-rich crucible has shown areas of an initial dissolution in which slag-surrounded micro-sized spinel grains are present. At the edge of the spinel grains comparatively high proportions of S and Ca are detected.
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Optimization of Properties for Alumina-Spinel Refractory
· Aiming at optimizing properties of alumina-spinel refractory castables coarse corundum particles were replaced partially with the particles of a novel porous multi-component CMA (CaO-MgO-Al 2 O 3) aggregate in the same size.Properties including the bulk density apparent porosity strength slag corrosion resistance thermal shock resistance and thermal fatigue resistance of alumina-spinel
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Magnesium Aluminum Spinel BrickRongsheng Refractory
· Generally mg-aluminum spinel refractory refers to the general structure of MgAl2O4 or MgO·Al2O3 that is the magnesium aluminum spinel is prepared from high-purity materials has good corrosion resistance thermal shock stability. Magnesium aluminum spinel refractory bricks have a few anti-flaking properties. Magnesium aluminate spinel
Get PriceCorrosion Mechanisms of Different Refractory Aggregates in
· The corrosion and penetration mechanisms of slag on tabular alumina aggregates and lightweight alumina aggregates were similar to the reactions of the brown fused alumina aggregates. Due to the reaction of MgO and Al 2 O 3 in the aggregate magnesium aluminate spinel was formed. This was accompanied by a certain volume expansion which caused
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Magnesium Aluminum Spinel BrickRongsheng Refractory
· Generally mg-aluminum spinel refractory refers to the general structure of MgAl2O4 or MgO·Al2O3 that is the magnesium aluminum spinel is prepared from high-purity materials has good corrosion resistance thermal shock stability. Magnesium aluminum spinel refractory bricks have a few anti-flaking properties. Magnesium aluminate spinel
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Influence of Nanocrystalline MgAl2O4 Spinel Addition on
· Nanopowders of magnesium aluminate (MgAl 2 O 4) spinel prepared through citrate-nitrate gel method and calcined at 800°C were incorporated to the matrix of magnesia-carbon (MgO-C) refractory.The physical and chemical properties of the nano-MgAl 2 O 4 spinel-added (0.5 and 1.0 wt ) MgO-C bricks were compared with those of MgO-C bricks containing no spinel and commercially
Get PriceCorrosion of MgO-C with Magnesium Aluminate Spinel
The reference sample MgO-C without spinel addition gets infiltrated by slag and shows intense dissolving especially by CaO. The slag resulting from this reaction still has a highly reactive character which explains the high corrosion rate. MgO-C containing alumina-rich spinel AR78 also reacts with CaO but additionally with Al 2 O 3 from
Get PriceMagnesium Aluminate Spinel Raw Materials for High
· Magnesium aluminate spinels are increasingly being used in refractories for steel-making due to their particular combination of resistance to steel-making slag corrosion thermal shock resistance and excellent hot strength. Spinel refractories were initially (mid-1960 s) produced by the in-situ reaction of alumina with periclase in magnesia
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Sintering Studies on Magnesia-Rich Chromium-Free Spinel
Basic bricks with Cr2O3 from chrome ore as the spinel forming oxide are used in the non-ferrous industry because of their corrosion resistance against fayalite-type slags rich in FeO. Our objective in this study was to replace Cr3 with Me4 ions which along with Fe3 could maintain the spinel formation capability with MgO and perform similarly against fayalite slags in non-ferrous furnaces.
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Magnesium Aluminate Spinel Raw Materials for High
· Magnesium aluminate spinels are increasingly being used in refractories for steel-making due to their particular combination of resistance to steel-making slag corrosion thermal shock resistance and excellent hot strength. Spinel refractories were initially (mid-1960 s) produced by the in-situ reaction of alumina with periclase in magnesia
Get Price
Influence of Nanocrystalline MgAl2O4 Spinel Addition on
· Nanopowders of magnesium aluminate (MgAl 2 O 4) spinel prepared through citrate-nitrate gel method and calcined at 800°C were incorporated to the matrix of magnesia-carbon (MgO-C) refractory.The physical and chemical properties of the nano-MgAl 2 O 4 spinel-added (0.5 and 1.0 wt ) MgO-C bricks were compared with those of MgO-C bricks containing no spinel and commercially
Get Price
Corrosion Mechanism of MgO–CMA–C Ladle Brick with
nesia refractories has been developed which contain calcium magnesium aluminate (CMA) cement binder or aggregates to increase the high-temperature properties and corrosion resis-tance by incorporation of magnesium aluminate spinel. 11–13 The physical and thermomechanical properties of MgO–CMA–C refractories are similar to those of common
Get Price
