(DOC) Effect of graphite on the sintering and
Also Apparent Porosity (A.P.) and Bulk Density (B.D.) were carried out. Finally we discussed the effect of insitu reducing atmosphere within the Al2O3-Cr2O3 refractories with the addition of graphite fine powder. OBJECTIVE We studied the densification and sintering behavior of alumina-chrome refractories both in oxidizing and reducing atmosphere.
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RUC1Refractory concrete mixtureGoogle Patents
FIELD metallurgy. SUBSTANCE invention relates to production of refractory articles and monolithic lining of thermal generating units operated at high temperature in contact with aggressive melted materials slag metals clinker and glass in various industries. Refractory concrete mixture contains refractory filler based on alumina of different fractions alumomagnesian spinel reactive
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Cement rotary kiln questions answers
The refractoriness of high alumina refractories increases with increase of alumina percentage.Silica Refractories Silica brick is a refractory material containing at least 93 SiO2. From a volume standpoint silica brick are second only to fire clay brick.
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Publications TU Bergakademie Freiberg
Publications. Al-Zoubi A. Zehmisch R. Ray S. Trimis D (2011) "Numerical Determination of the Effective Thermal Conductivity of Refractory Materials Using the
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Soild-phase synthesis of MgAl2O4 powder in reducing
Jan 09 2019 · Ganesh et al added spinel into MgO-C brick and used it in steel ladle it was found that the refractory containing spinel has better corrosion resistance than that of as-received MgO–C brick . Nano-spinel has high specific surface area which could effectively fill pores of the refractories and change the distribution of pore sizes so that
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Nov 29 2020 · The corrosion resistance of high alumina spinel castable are more dependent on the spinel content rather than the porosity of the refractory. The formation of C 2 AS is detrimental to a refractory corrosion resistance due to its low melting temperature which in
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Development of Carbon Containing Castables for Steel Ladle
The application of graphite is restricted in carbon containing refractory castables due to low wettability with water weak nature of carbon bond between oxygen and graphite at elevated temperatures and poor oxidation resistance. The present work aims at the development of carbon containing alumina-magnesia castables for steel ladle applications.
Get PriceThe Optimisation of Magnesia Containing Castables
Tech. Assoc. of Refractories Japan 28 (2008) 3 180–184 8 Ko Y.C. Development and production of Al2O3- MgO and Al2O3-spinel castables for steel ladles. Mining and Metallurgy Taipei 47 1 132–140 9 Auvray J.M. et al. New insights into corrosion mechanisms of dense refractory castables containing a novel calcium-magnesia-alumina
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A Review on Recent Advances on Magnesia-Doloma
Otroj S Marzban R Nemati ZA Sajadi N Nilforoushan MR. BEHAVIOUR OF ALUMINA-SPINEL SELF-FLOWING CASTABLES WITH NANO-ALUMINA PARTICLES ADDITION. Ceramics–Silikáty. 200953(2) 98-101. 68. Badiee SH Otroj S. EFFECT OF NANO-TITANIA ADDITION ON THE PROPERTIES OF HIGH-ALUMINA LOW-CEMENT SELF-FLOWING REFRACTORY CASTABLES.
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Dissolution in Ceramic Systems 11 Dissolution of Aluminu
Kinetics and Mechanism of Corrosion of ρ-alumina Bonded Alumina Castable by Molten Slag Journal of the Korean Ceramic Society 10.4191/KCERS.2003.40.10.1015 40 10 () (2003). Crossref
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(PDF) Thermomechanical Behavior of High-Alumina Refractory
J. Am. Ceram. Soc. 83 10 2481–90 (2000) journal Thermomechanical Behavior of High-Alumina Refractory Castables with Synthetic Spinel Additions Fabien Simonin † Christian Olagnon † Sandrine Maximilien and Gilbert Fantozzi Institut National des Sciences Applique´es (INSA) Groupe d Etudes de Me´tallurgie Physique et de Physique des Mate´riaux (GEMPPM) UMR 5510 F69621
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Marketing of Refractory Products A study in the refractory
CHAPTER-1. 1-INTRODUCTION 1.1 BACKGROUND OF THE STUDY . Three main sectors which contribute to the Indian economy are agriculture industrial and service we cannot ignore as in GDP growth was 8.1 with Industrial sector to 9.4 agriculture growth 2.3 1.So Industrial sector has lot more contribution to the India s Economic as Industrial goods are defined as companies which buy
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Farhad Golestani FardAcademia.edu
Thus this work investigates the migration effects of citric acid in colloidal silica-bonded high-alumina castables. Measuring the flowability of designed compositions over time has revealed that citric acid works as a retarder of MgO (the colloidal silica setting agent) resulting in enough workability (up to
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CeramicsMDPI
This paper focuses on the slag resistance of NCCs and the often-used spinel containing low cement castable (LCC) is used as the reference. Three different NCC binders were designed (i) Al2O3 MgO (alumina bond) in situ spinel formation (ii) Al2O3 SiO2 (microsilica-gel bond) mullite formation and (iii) Al2O3 MgO SiO2 (MgO-SiO2 bond).
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Microstructural changes and evolutions of elastic
The measured properties are mainly Young s modulus evaluated by a high temperature ultrasonic technique and thermal expansion followed by dilatometry. Materials are alumina-based low cement castables with a fraction of alumina eventually substituted by spinel or magnesia.
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Foaming mechanisms of different foaming agents and their
Dec 23 2019 · The foaming and foam stabilization mechanisms of potassium laurate (PL) potassium oleate (PO) sodium dodecyl sulfate (SDS) and sodium dodecylbenzenesulfonate (SDBS) were investigated in this study. Magnesia porous ceramics were fabricated by a foaming method and the sample microstructures were analyzed by scanning electron microscopy (SEM) following heat treatment.
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Recent advances in silica-alumina refractory A review
Abstract In this article the elaboration and the characterization of silica-alumina refractory have been reviewed. Refractory oxides encompass a broad range of unary binary and ternary ceramic compounds that can be used in structural insulating and other applications. This paper provides a historical perspective on the elaboration and the use of silica-alumina refractory reviews
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Spinel-containing alumina-based refractory castables
Aug 01 2011 · In the late 1980 s spinel containing alumina refractories were also developed especially castables for steel ladle lining in Japan. However magnesia rich spinels have shown disadvantages for such applications because they are designed to contain traces of free magnesia.
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Soild-phase synthesis of MgAl2O4 powder in reducing
Jan 09 2019 · Ganesh et al added spinel into MgO-C brick and used it in steel ladle it was found that the refractory containing spinel has better corrosion resistance than that of as-received MgO–C brick . Nano-spinel has high specific surface area which could effectively fill pores of the refractories and change the distribution of pore sizes so that
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Issue No. 1Techna Group
Abstract. The main target of this work is to prepare refractory magnesia- and alumina- based ceramics within the MgO-Al2O3-ZrO2-SiO2 system. These include periclase (MgO) and its composites with MgAl2O4-spinel and forsterite (MgSiO4)-zirconia (ZrO2) as well as corundum (α-Al2O3) and its composite with mullite (Al6Si2O13)-zirconia (ZrO2).
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Mineral Transition and Chemical Reactivity Evolution of a
The mineral formation–transition mechanism microstructure evolution crystal structure pulverization property and chemical reactivity of the CaO–Al2O3–SiO2 clinker with MgO and Na2SO4 dopants during the sintering process at 1300 °C for 2.0 h were systematically studied using CaO Al2O3 SiO2 MgO and Na2SO4 as raw materials when the molar ratio of CaO to Al2O3 is 1.4 the mass ratio
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Foaming mechanisms of different foaming agents and their
Dec 23 2019 · The foaming and foam stabilization mechanisms of potassium laurate (PL) potassium oleate (PO) sodium dodecyl sulfate (SDS) and sodium dodecylbenzenesulfonate (SDBS) were investigated in this study. Magnesia porous ceramics were fabricated by a foaming method and the sample microstructures were analyzed by scanning electron microscopy (SEM) following heat treatment.
Get PriceRheology of High Performance Alumina and Spinel Castables
ple this might be a matrix of a high alumina castable designed with high microsilica content to achieve mullite formation or a spinel containing castable for steel ladles where the use of reactive alumina is the only way to achieve high performance cast-ables. refractories WORLDFORUM 4 (2012) 2 95 η = 1- ϕ- η ϕm ηmedium ϕm
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Study of Spinel-Containing High Alumina Castable with
Dec 01 2014 · 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.
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(PDF) Spinel-containing alumina-based refractory castables
After leaching experiments an alumina-based ceramic containing approximately 36.8 Al2O3 61.4 MgAl2O4 with 1.8 Na2FeO4 which might be available to use as a spinel refractory in steel smelting
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