Spinel Containing Alumina Based Refractory Castablesthe Use And Classification Of Aluminum Magnesium Spinel
Methods of use of calcium hexa aluminate refractory
A method for improving the insulating character/and or penetration resistance of a surface comprising lining a surface of a lime kiln a cement kiln a roasting kiln a thermal oxidizer or a fluidized bed reactor that is subject to wear by an alkali environment and/or an alkaline environment with a refractory composition comprising a refractory aggregate consisting essentially of a calcium
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US Patent for Magnesia alumina type spinel clinker and
A magnesia alumina type spinel clinker contains Fe b 2 O b 3 and TiO b 2 at boundaries between crystal grains and a refractory produced by using the clinker has excellent corrosion resistance and cement coating properties The refractory can thus be applied to the fields of cement rotary kiln refractories refractories for iron making steel making and nonferrous refining and the like
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Magnesium Aluminate Spinel Nanoparticles Nanopowder
Magnesium Aluminate Spinel Nanopowder or Nanoparticles are typically < 50 nanometers nm with specific surface area SSA in the 16 7 m2/g range Aluminates are compounds with a negatively charged alumina ion and a metallic oxide with various industrial applications such as water treatment and ceramics manufacturing
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Rheology of refractory concrete An article review
Castables are composed of refractory aggregates with different sizes from 300 μm to 20 mm for strength and hot properties beside matrix components bonding agents modifiers and admixtures as shown in Table 2 The most abundant aggregates are fused or sintered alumina because they have low thermal expansion coefficient and high strength combined with good insulation properties
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classifications of high temperature refractory castablethe
refractory electromagnetic windows and transparent armor The magnesium ions are formally located on the tetrahedral sites and the aluminum ions are located on the octahedral sites Fig 1 shows the magnesium aluminate spinel in the normal spinel crystal structure form At high temperatures however there is significant mixing of Get Price
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Mechanical and fracture investigation of magnesia
In order to investigate the nonlinear fracture behaviour and give a new comprehension about the classification of fracture processes base on the wedge splitting test combined with AE and DIC techniques the typical industrial refractories magnesia hercynite refractory MFA and magnesia magnesium aluminate spinel refractory MA were used owing to their good thermal shock resistance
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Materials Free Full Text The Formation of Cr Al Spinel
CARTER R E Mechanism of Solid state Reaction Between Magnesium Oxide and Aluminum Oxide and Between Magnesium Oxide and Ferric Oxide J Am Ceram Soc 1961 44 116–120 Google Scholar NAVIAS L Preparation and Properties of Spinel Made by Vapor Transport and Diffusion in the System MgO Al 2 O 3 J Am Ceram Soc 1961 44 434–446
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Refractories and Classification of RefractoriesIspatGuru
Refractories and Classification of Refractories Refractories are inorganic nonmetallic porous and heterogeneous materials composed of thermally stable mineral aggregates a binder phase and additives The principal raw materials used in the production of refractories are normally the oxides of silicon aluminum magnesium calcium and zirconium
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The main usage of the magnesium aluminate spinel are in the field of refractories as bricks and monolithic castables and also in engineering ceramics like automobile engine pump etc as sintering aid for silicon carbide etc due to its superior thermo mechanical properties and chemical stability and in various other industrial applications where magnesium aluminate spinel is required for its different
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Evaluation of Refractories for Aluminum Recycling Furnaces
recycling by the aluminum indus try has placed severe demands on refractories used by the industry The r ecycling of aluminum r equir es the r emelting of prod u cts containing oils coatings oxide layers and other cont aminants Melting aluminum containing these types of con
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USA1Aluminum resistant refractory
A refractory composition for use in contact with molten aluminum and molten aluminum alloys containing a refractory aggregate a binder and a treatment additive comprising a source of Sr Methods comprising contacting a refractory composition with the Sr source to improve the resistance of the refractory to molten aluminum attack are also disclosed
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Rheology of refractory concrete An article review
Fireclay brick an aluminum silicate refractory with silica content up to 78 and alumina amount up to 44 High alumina refractory an aluminum silicate refractory with a dominant alumina phase reaching more than 45 Mullite refractories consist of 71 8 wt alumina and 28 2 wt silica
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Material Composition and Properties of Refractory Bauxites
Corundum 2050 61 4 Al O 2 3 Table 1 shows that alumina containing compounds offer1850 57 6 CaO 6Al O 2 3 a clear advantage over their chemical analogs of magnesian Spinel MgAl O 2135 55 1 2 4 composition in the calculated theoretical energy density Periclase MgO 2800 50 9 despite the lower melting point of the corresponding simple and
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Methods of Use of Calcium Hexa Aluminate Refractory
A method for improving the insulating character/and or penetration resistance of a surface comprising lining a surface of a lime kiln a cement kiln a roasting kiln a thermal oxidizer or a fluidized bed reactor that is subject to wear by an alkali environment and/or an alkaline environment with a refractory composition comprising a refractory aggregate consisting essentially of a calcium
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US Patent for Spinel bondable ceramic composition Patent
A high alumina ceramic composition has controlled small amounts of MgO and CaO When refractories made from the composition are fired the alumina and MgO react to form spinel The CaO promotes such reaction while minimizing undesirable expansion and results in a refractory having significantly improved hot strength and other desirable physical properties
Get PriceCeramic Filters for Aluminum Melt Review SpringerLink
Spinel inclusions appear because of the presence of magnesium ions in the aluminum melt primarily from the furnace refractories Since the free energy of formation of MgO is lower than that of Al 2 O 3 melts containing magnesium oxides form predominately The magnesium entering the aluminum melt also leads to the formation of other
Get PriceCeramic Fiber PaperRongsheng Refractory
In the production of refractory ceramic fiber paper refractory cotton with different classification temperatures is used as the main raw materials such as ordinary refractory cotton high purity refractory cotton high aluminum refractory cotton zirconium containing refractory cotton as the main raw materials
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Addition of 2 0 wt of nano Magnesium aluminate spinel rich magnesia M MA to Magnesia calcium zirconate composite brick enhanced the cold crushing strength by 44 8 because it acts as a ceramic bond linkage between magnesia and calcium zirconate but the further spinel addition reduced the strength significantly due to excessive generating microcracks
Get PriceLaboratory Study on Evolution Mechanism of Nonmetallic
To explore the effect of refractory on the evolution of inclusions laboratory experiments were conducted with MgO refractory utilizing electron probe X ray microanalysis Based on primary inclusions components six types of inclusions were observed in the steel with MgO refractory Al2O3 Al2O3–MgO Al2O3–CaO Al2O3–MgO–CaO Al2O3–SiO2–CaO and MgO inclusions
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Magnesium Aluminate Spinel AMERICAN ELEMENTS
Magnesium Aluminate Spinel is a matrix material for high strength ceramics and in hardened glass such as bulletproof glass Aluminates are compounds with a negatively charged alumina ion and a metallic oxide with various industrial applications such as water treatment and ceramics manufacturing
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Development of spinel sol bonded high pure alumina
The use of Mg Al spinel as refractory aggregates has been also been reported to improve the performance of refractory castables mainly by the enhancing hot strength thermal shock resistance and corrosion resistance These advantages of spinel have encouraged developing spinel sol and using the same in high alumina composition as sole binder
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Chromium Compound Containing Patents and Patent
Abstract A refractory composition for use in contact with molten aluminum alloys containing a refractory aggregate a binder and 9Al b 2 O b 3 2B b 2 O b 3 The aluminum borate may be of the type produced as a by product in the production of ferro boron alloys and known as aluminum boron slag
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Types of Refractory Materials and Their Applications
Alumina refractories containing more than 45 alumina are generally termed as high alumina materials The alumina concentration ranges from 45 to 95 Commonly used refractory are sillimanite 61
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Materials Free Full Text The Formation of Cr Al Spinel
Its structure can be regarded as spinel type in which oxygen atoms are arranged in a cubic close packing and Al atoms occupy the octahedrally and tetrahedrally coordinated sites γ Al 2 O 3 which is also called activated alumina has a large surface area and strong adsorption capacity and therefore is widely employed as absorbents catalyst supports chromatographic media and ion exchanges 3 4 5
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Magnesium Aluminum Oxide AMERICAN ELEMENTS
Aluminum s name is derived from alumina the mineral from which Sir Humphrey Davy attempted to refine it from in 1812 It wasn t until 1825 that Aluminum was first isolated by Hans Christian Oersted Aluminum is a silvery gray metal that possesses many desirable characteristics It
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USA1Aluminum resistant refractory
A refractory composition for use in contact with molten aluminum and molten aluminum alloys containing a refractory aggregate a binder and a treatment additive comprising a source of Sr Methods comprising contacting a refractory composition with the Sr source to improve the resistance of the refractory to molten aluminum attack are also disclosed
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TWAUnburned alumina carbon brick and kiln
Disclosed is an unburned alumina carbon brick having spinel added thereto which rarely undergoes a hydration reaction and therefore has improved corrosion resistance The unburned alumina carbon brick is produced by adding an organic binder to a refractory raw material blend containing an alumina raw material and a carbon raw material as the main raw materials and additionally containing
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A Review of Steel Processing Considerations for Oxide
The time constant for steel–slag reactions is given by H/m where m is the effective mass transfer coefficient for steel–slag reaction and H is the depth of steel in the ladle the typical time constant is tens of minutes hundreds of seconds The homogenization time depends on the stirring rate by argon bubbling for the example shown in Figure 1 and is typically a few
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PDF HARBISON WALKER Handbook of Refractory Practice
HARBISON WALKER Handbook of Refractory Practice Harbison Walker Refractories Company 400 Fairway Drive Moon Township PA 15108
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Mechanical and fracture investigation of magnesia
In order to investigate the nonlinear fracture behaviour and give a new comprehension about the classification of fracture processes base on the wedge splitting test combined with AE and DIC techniques the typical industrial refractories magnesia hercynite refractory MFA and magnesia magnesium aluminate spinel refractory MA were used owing to their good thermal shock resistance
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1 Introduction The magnesia magnesium aluminate spinel M MA refractories were alternatives to magnesia chromite refractories forty years ago due to environmental hazards of chromium compounds They form eutectic at 2135 °C which is higher than the sintering temperature zone of cement kiln 1500 °C where they are used to line the cooling and transitional zones more than the
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Refractories and Classification of Refractories u2013
10/19/2019 Refractories and Classification of RefractoriesIspatGuru 2/9 Refractories are usually inorganic non metallic materials with refractoriness greater than 1500 deg C They belong to coarse grained ceramics having microstructure which is composed of large grains The basis of body is coarse grained grog joined by ±ne materials Refractory products are a speci±c sort of ceramics
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Development of spinel sol bonded high pure alumina
The use of Mg Al spinel as refractory aggregates has been also been reported to improve the performance of refractory castables mainly by the enhancing hot strength thermal shock resistance and corrosion resistance These advantages of spinel have encouraged developing spinel sol and using the same in high alumina composition as sole binder
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