evolution of an alumina magnesia self forming spinel
USATransparent magnesia-alumina spinel and
spinel transparent alumina melt magnesia Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired
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(PDF) Formation and sintering of spinels (MgAl 2O 4) in
A thermodynamic approach to obtaining transparent spinel (MgAl2O4) by hot pressing By Laura Esposito High pressure synthesis of magnesium aluminate composites with MoSi2 and Mo5Si3 in a self
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The influence of in situ spinel formation on
· The microstructural evolution of the matrix was also influenced by the spinel formation from reactive alumina and MgO fine grains. It was also clarified that the spinel stoichiometric was varied from normal type to alumina rich depending upon the firing temperature and atmosphere.
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Alumina-rich refractory concretes with added spinel
· The composition of the alumina-rich refractory concretes with added spinel magnesia or dolomite which are currently employed in the steel industry is located within the alumina-rich corner of the Al 2 O 3 –MgO–CaO ternary phase equilibrium diagram. The designing of materials in the high alumina zone within this ternary system has two
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TECHNOLOGIES OF ALUMINA-MAGNESIA REFRACTORIES
· spinel forming reaction. Both UAM brick and AM castables mainly consist of alumina and magnesia. Under high temperature conditions during operation these two components react and form spinel (Al 2 MgO 4) as expressed in Equation 1. Al 2 O 3 MgO → Al 2 MgO 4 (1) Since the reaction is accompanied by volume expansion joint openings and/or small
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Effect of Spinel Kinds on Properties of Alumina—Spinel
· Alumina–spinel castables have also been developed with in situ spinel‐forming material where fine MgO powder taken in batch reacts with Al 2 O 3 fines to form spinel on firing and fine spinel formed " in situ " by the reaction of MgO–Al 2 O 3 in the matrix of alumina–magnesia castable increases resistance to corrosion and slag
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Magnesia Alumina Spinel Brick for Cement Industry real
Buy Magnesia Alumina Spinel Brick for Cement Industry Find Details include Size Weight Model and Width about Magnesia Alumina Spinel Brick for Cement Industry. Make an Inquiry for Magnesia Alumina Spinel Brick for Cement Industry at OKorder.
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Thermal Expansion Characteristics of Alumina–Magnesia and
The thermal expansion of Al 2 O 3 –MgO castables containing 5.5 wt MgO and 1.36 wt CaO and Al 2 O 3 –spinel castables containing 20 wt spinel having 95 wt Al 2 O 3 and 1.7 wt CaO was measured in the temperature range of 800–1650°C by dilatometry. A sharp increase in expansion from around 1425° to 1525°C followed by a sharp decrease with further increasing temperature is
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The influence of in situ spinel formation on
· The influence of in situ spinel formation on microstructure and strength of MgO–C refractories containing reactive alumina is investigated as a function of coking temperature. XRD SEM MOR techniques and rotary slag testing were employed to evaluate the microstructure and properties. The improvement of refractory properties was found to be related to the in situ spinel formation in the matrix.
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Preparation of magnesium aluminate spinel by auto
· alumina to form spinel measured by technical sintering is 5 percent. Thus the addition of spinel to aluminous bodies will impart some volume expansion. The free magnesia in the spinel can also be used as a setting agent for phosphate bonds to produce a
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Effect of Spinel Kinds on Properties of Alumina—Spinel
· Alumina–spinel castables have also been developed with in situ spinel‐forming material where fine MgO powder taken in batch reacts with Al 2 O 3 fines to form spinel on firing and fine spinel formed " in situ " by the reaction of MgO–Al 2 O 3 in the matrix of alumina–magnesia castable increases resistance to corrosion and slag
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Study 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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Kinetic analysis of spinel formation from powder
· A kinetic investigation into the formation of spinel from alumina (Al2O3) and magnesia (MgO) powder compaction with a stoichiometric mixing molar rati
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Phase Evolution During Preparation of Spinel-Containing
· Spinel containing high alumina refractory cements are in high demand by the glass cement and metallurgy industries. These spinel cements are normally produced with high cost materials. A solution is to generate the spinel phase in-situ when making the refractory materials from dolomites.
Get PricePorogenesis in the Alumina-Brucite-Magnesia-Spinel System
· Magnesium monoaluminate spinel (MgAl 2 O 4) structures were produced in situby the combination of calcined alumina as a source of α-Al 2 O 3 and different proportions of brucite (α-Mg(OH) 2) and magnesia (α-MgO) as sources of MgO.
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Evolution of an alumina-magnesia/self-forming spinel
Evolution of an alumina-magnesia/self-forming spinel castable. Part II physico-chemical and mechanical properties Evolução de um refratário de espinélio auto-formado de alumina-magnésia Parte II Propriedades físico-químicas e mecânicas
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A particulate composition for use in alumina-magnesia spinel forming dry vibratable mixtures may include based on the total weight of the particulate composition from 95 to 99.9 wt of a mixture of particulate Al 2 O 3 and particulate MgO and from 0.1 to 5 wt binding agent wherein at least a portion of the particles of said mixture of particulate Al 2 O 3 and particulate MgO is present
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Study 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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Alumina-rich refractory concretes with added spinel
· The evolution of the amount of spinel with temperature presents two maximums one in the 1200–1300 °C range and a second maximum between 1500 and 1600 °C. The second maximum shows a higher value than the former which may be related with the coarse grain size of the magnesia used in the preparation of materials.
Get PriceMicrostructural changes and evolutions of elastic
Materials are alumina-based low cement castables with a fraction of alumina eventually substituted by spinel or magnesia. The granularity of the different used raw materials is chosen by using a packing model in order to reduce the final porosity in the hydrated state.
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A particulate composition for use in alumina-magnesia spinel forming dry vibratable mixtures may include based on the total weight of the particulate composition from 95 to 99.9 wt of a mixture of particulate Al 2 O 3 and particulate MgO and from 0.1 to 5 wt binding agent wherein at least a portion of the particles of said mixture of particulate Al 2 O 3 and particulate MgO is present
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Evolution of an alumina-magnesia/self-forming spinel
Refractories containing magnesium aluminate spinel (MgAl2O4) are materials for emerging technology in several applications like cement and steelmaking processes. In order to deep the understanding of these castables this work presents the microstructural characteristics of an alumina-magnesia/self-forming spinel
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Corrosion of MgO-C with Magnesium Aluminate Spinel
For more than 20 years the sidewalls and bottom of steel ladles have been lined with carbon-bonded magnesia (MgO-C) and magnesia-alumina bricks (MAC). The alumina raw materials react with magnesia forming a spinel which decreases open porosity and slag infiltration. The amount grain size and chemistry of the added spinel impact the properties of spinel-containing MgO-C. Corrosion tests
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USAMagnesia-alumina type spinel clinker and
A magnesia-alumina type spinel clinker contains Fe 2 O 3 and TiO 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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A particulate composition for use in alumina-magnesia spinel forming dry vibratable mixtures may include based on the total weight of the particulate composition from 95 to 99.9 wt of a mixture of particulate Al 2 O 3 and particulate MgO and from 0.1 to 5 wt binding agent wherein at least a portion of the particles of said mixture of particulate Al 2 O 3 and particulate MgO is present
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Materials Additives Mixes
· High-Temperature Mechanical Characterisation of In-Situ Forming Spinel-Alumina Castables Using Magnesia or Magnesite as Raw Material. In this work four alumina-magnesia cement-bonded castables were tested at high temperature. Strength was determined by bending test at temperature ranging from room temperature to 1550 °C.
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The invention discloses a magnesia-alumina spinel structure heat insulation integral composite brick and a preparation method thereof. The heat insulation integral composite brick comprises a heavy work layer and a light heat insulation layer wherein the heavy work layer is made of compact magnesia-alumina spinel the light heat insulation layer is made of light aggregate of alumina hollow
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Thermal Expansion Characteristics of Alumina–Magnesia and
The thermal expansion of Al 2 O 3 –MgO castables containing 5.5 wt MgO and 1.36 wt CaO and Al 2 O 3 –spinel castables containing 20 wt spinel having 95 wt Al 2 O 3 and 1.7 wt CaO was measured in the temperature range of 800–1650°C by dilatometry. A sharp increase in expansion from around 1425° to 1525°C followed by a sharp decrease with further increasing temperature is
Get PriceKinetic analysis of spinel formation from powder
· A kinetic investigation into the formation of spinel from alumina (Al2O3) and magnesia (MgO) powder compaction with a stoichiometric mixing molar rati
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