Effects of SnO2 Addition on the Properties of Alumina
Alumina-magnesia castables were prepared according to the Alfred packing model (q = 0.26). The compositions (Table 1) comprised tabular aluminas (T60 Almatis) as aggregates reactive alumina (CL370 Almatis) cal-cined magnesia (95 wt ) as the main matrix components and calcium aluminate cement as the binder source (Secar 71 Kerneos).
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Effects of SnO2 Addition on the Properties of Alumina
Alumina-magnesia castables were prepared according to the Alfred packing model (q = 0.26). The compositions (Table 1) comprised tabular aluminas (T60 Almatis) as aggregates reactive alumina (CL370 Almatis) cal-cined magnesia (95 wt ) as the main matrix components and calcium aluminate cement as the binder source (Secar 71 Kerneos).
Get PriceClassifications of High Temperature Refractory Castable
As we all know high temperature castable refractory has a simple production process saves labor and energy and has high construction efficiency and good quality. And can be formulated on site or choose materials with excellent performance. Also known as refractory castable.The refractory castable is composed of cement aggregate and admixture and sometimes accelerator is added.
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Symposium COCimtec Congress
Considering this aspect MgF 2-containing aqueous suspensions and alumina-magnesia cement-bonded compositions with and without magnesium fluoride were evaluated in order to better understand the role of this mineralizing additive in the castable s phase evolution.
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Symposium COCimtec Congress
Considering this aspect MgF 2-containing aqueous suspensions and alumina-magnesia cement-bonded compositions with and without magnesium fluoride were evaluated in order to better understand the role of this mineralizing additive in the castable s phase evolution.
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Effects of rare earth oxides additions on microstructure
Jun 15 2017 · The phase evolution such as spinel and CA 6 formation in cement-bonded spinel-forming castables was more complicated . Thus the non-homogeneous distribution of yttrium and cerium as well as the morphology of CA 6 in alumina-magnesia castables was most likely related to the respective interaction mechanism of Y 2 O 3 and CeO 2.
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Refractories for the Cement Industry Resco Products
Need a cement-bonded refractory castable for a burner pipe or clinker cooler or a colloidal silica cement-free castable for a suspension preheater Looking for a magnesia alumina spinel brick that improves your rotary cement kiln No matter what you need in the cement industry Resco Products will assist you every step of the way.
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Tailoring the Microstructure of Cement‐Bonded Alumina
Taking into account the usual microstructure of cement‐bonded alumina–magnesia refractory castables comprising low‐temperature melting point phases in the CaO–MgO–Al 2 O 3 ‐–SiO 2 system and calcium hexaluminate (CA 6) platelets this material could be a good candidate to be designed based on the structure of biological materials
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Refractories for the Cement Industry Resco Products
Need a cement-bonded refractory castable for a burner pipe or clinker cooler or a colloidal silica cement-free castable for a suspension preheater Looking for a magnesia alumina spinel brick that improves your rotary cement kiln No matter what you need in the cement industry Resco Products will assist you every step of the way.
Get PriceEFFECTS OF MnO ADDITIONS ON THE PROPERTIES OF
adding mineralizing compounds which are normally used to decrease the reaction temperature and accelerate the densification of castables. In this work the influence of MnO additions on the properties of calcium aluminate cement-bonded alumina-magnesia castables was investigated.
Get PriceMineralizing Magnesium Aluminate Spinel Formation With
Abstract B2O3 mineralizes spinel formation from stoichiometric (1 1 mole ratio) calcined magnesia and alumina. After 3 h at 1100°C X-ray diffraction (XRD) shows the mineralization effect of B2O3
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THE PROPERTIES OF A LOW CEMENT CASTABLE
spinel-alumina castables prepared by hydrated magne-sium aluminate gels 18-24 . Instead of magnesia fines (used traditionally) those castables are bonded with sol gel derived and conventionally coprecipitated spinel gels 25 26 . Amodified method for preparing magnesia aluminate gel had been suggested by some authors
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THE PROPERTIES OF A LOW CEMENT CASTABLE
spinel-alumina castables prepared by hydrated magne-sium aluminate gels 18-24 . Instead of magnesia fines (used traditionally) those castables are bonded with sol gel derived and conventionally coprecipitated spinel gels 25 26 . Amodified method for preparing magnesia aluminate gel had been suggested by some authors
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Synthesis and Rheological Property of Calcium Aluminate
Abstract Calcium aluminate cements with different MgAl 2 O 4 spinel (CMA) contents and particle sizes were synthesized. The results revealed that when the synthesis temperature was raised from 1400℃ to 1500℃ the particle size of MgAl 2 O 4 (MA) increased from 5 μm to 15 μm. The MA particles appeared in clusters and were distributed around the CaAl 2 O 4 /CaAl 4 O 7 (CA/CA 2) particles
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Calcium Aluminate Cement Bonded CastableRS Kiln
Calcium aluminate cement bonded castable is the most widely used castable in unshaped refractory field. The max working temperature of clay castable is between 1300 1450℃ clay castable is usually used as inner lining of steel rolling heating furnaces all kinds of heat treatment furnaces boilers vertical kilns and rotary kiln preheating zone.
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Unshaped Refractories
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 PROPERTIES OF A LOW CEMENT CASTABLE
spinel-alumina castables prepared by hydrated magne-sium aluminate gels 18-24 . Instead of magnesia fines (used traditionally) those castables are bonded with sol gel derived and conventionally coprecipitated spinel gels 25 26 . Amodified method for preparing magnesia aluminate gel had been suggested by some authors
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How to Solve the Phenomenon on the Surface of Refractory
Mar 09 2021 · Carbonation of high-alumina refractory castables is often considered to be one of the main reasons that lead to the decrease of castable structure and spalling. The high-alumina cement-bonded refractory castable is exposed to the air and the hydration products therein react with the CO2 gas in the air to undergo a carbonation reaction.
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Microsilica effects on cement bonded alumina-magnesia
Alumina-magnesia refractory castables are usually bonded with calcium aluminate cement (CAC) because of its notable advantages including suitable workability and mechanical strength.
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Refractory Castable of High Grade in RS Refractory
In respect of binder property and bonding mechanism refractory castable can be divided into hydrous binding castable (calcium aluminate cement and silicate cement bonded castable) chemical bonded castable (phosphate sodium and potassium silicate bonded castable) agglomeration bonded castable ( SiO2 Al2O3 micro powder bound castable
Get PriceMechanical behavior and microstructure of porous needle
Oct 15 2017 · Reinforcing magnesium alloys was proposed as well . The mechanical behavior of the material the chemical compatibility (low wettability) of the borate phase with metallic aluminum and the microstructural configuration of the metal-ceramic composites encourages these particular applications. Mineralizing alumina-magnesia cement-bonded
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WOA1Improved refractory brick for steel
A magnesia-carbon brick comprised of about 50 to about 95 by weight magnesia and about 1 to about 20 by weight carbon with or without metallic additions such that the chemical analysis of the mixture of aggregates used in the brick will comprise by chemical analysis about 2 to about 15 SiO 2 about 3 to about 50 Al 2 O 3 and about 50 to about 95 MgO.
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Unshaped Refractories
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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All articlesJournal of Ceramic Science
The cement-bonded castables exhibited a lower linear shrinkage rate apparent porosity and air permeability higher cold modulus of rupture and cold crushing strength as well as a smaller mean pore size than that of the ρ-Al 2 O 3-bonded castables. The results were attributed to
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A Review on Recent Advances on Magnesia-Doloma
to cement-bonded powdery concretes in the 1930 s 12 . In the 1960 s calcium-aluminate cement more specifically Cement Fondue started to be used for refractory applications followed by higher-quality 70 and 80 cement at the end of 1970 s and beginning of 1980 s. Concomitantly the difference
Get PriceCalcium Aluminate Cement Bonded CastableRS Kiln
Calcium aluminate cement bonded castable is the most widely used castable in unshaped refractory field. The max working temperature of clay castable is between 1300 1450℃ clay castable is usually used as inner lining of steel rolling heating furnaces all kinds of heat treatment furnaces boilers vertical kilns and rotary kiln preheating zone.
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Novel Engineered Routes for Advanced EIRICH AWARD 09
Nov 11 2009 · magnesia to alumina-magnesia castables could lead to a well distributed in-situ spinel (MgAl 2O 4) formation throughout the whole Novel Engineered Routes for Advanced Al 2O 3-MgO Refractory Castables M.A.L. Braulio L.R.M. Bittencourt S.R. van der Laan V.C. Pandolfelli The use of ultra fine particles of alumina and magnesia in Al 2O
Get PriceThermal 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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Synthesis of Special Clinkers with the Use of Technogenic
During research were developed ideas about the formation of C6A4MS phase in the aluminate clinker. The influence of the mineral and chemical composition of the raw mixture on the formation of C6A4MS was studied. Schemes of phase transformations providing synthesis of C6A4MS are proposed in this paper. Within research also have been studied the processes of hydration and hardening of aluminate
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All articlesJournal of Ceramic Science
The cement-bonded castables exhibited a lower linear shrinkage rate apparent porosity and air permeability higher cold modulus of rupture and cold crushing strength as well as a smaller mean pore size than that of the ρ-Al 2 O 3-bonded castables. The results were attributed to
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