spinel based refractories for improved performance
Spinel-Coated Graphite for Carbon Containing Refractory
J. Am. Ceram. Soc. 92 8 1895–1900 (2009) DOI 10.1111/j..2009.03133.x r 2009 The American Ceramic Society Journal Spinel-Coated Graphite for Carbon Containing Refractory Castables Sunanda Mukhopadhyay w Sarbasree Dutta Sheikh A. Ansar Sumita Das and Susmita Misra Department of Chemical Technology University of Calcutta Kolkata 700 009 India Oxidation
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Role of Tabular Alumina as a suitable aggregate for
refractories tabular alumina-magnesia-carbon resin bonded brick >95 Al2O3 bricks and so on. We know that in the above applications tabular alumina and spinel based refractory products outperform fused products (white or brown fused alumina/ fused spinel)
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Industrial Refractory ArchivesRS Kiln Refractory Bricks
Apr 01 2021 · How to Improve the Performance of Refractory Bricks for Hazardous Waste Rotary Kiln Pure magnesia refractories have very poor resistance to alkaline residues. However when magnesia-alumina spinel is added to magnesia materials it can well prevent the permeability of alkaline residues to refractory materials.
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Improvement of Resistance of MgO-Based Refractory to
3spinel offers a good improvement in both physical and chemical properties of MgO-based refractories such as densification slag penetration resistance and thermal shock resistance. A number of researchers have focused on the corrosion behavior between spinel-MgO and slag. Goto and co- workershave found that CaO-Al
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Proceedings of the Unified International Technical
Spinel-Based Refractories for Improved Performance in Coal Gasification Environments 1211 James G. Hemrick Beth Armstrong Angela Rodrigues-Schroer Dominick Colavito Jeffrey D. Smith and Kelley O Hara. Refractories for Glass
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USARefractories for casting processGoogle Patents
The present invention relates to a refractory for casting process composed mainly of 0.3 to 10 wt light burned magnesia 3 to 30 wt micro fine calcined alumina and the remainder of either
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Improved Refractories for Slagging Gasifiers in
Improved Refractories for Slagging Gasifiers in IGCC Power Systems chemistry and "proof of concept" of these materials through continued laboratory performance tests. Under a cooperative working in collaboration with a commercial refractory manufacturer to further develop a spinel-based material for this application.
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Mg-Al refractories_Steel Pipe knowledge_News_World Steel Tube
To this end the experts and scholars of the refractory-made activity of Mg-Al gum as a binding agent to study the activity of Mg-Al adhesive binder of high-purity magnesia brick and spinel performance combined with magnesia brick using the adhesive activity of Mg-Al Both performance products at 1 550 ° C firing the firing of such advanced
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Proceedings of the Unified International Technical
DANA G. GOSKI PHD is the Director of Research at Allied Mineral Products in Columbus Ohio. Dr. Goski earned her PhD in Engineering from Dalhousie University Canada. She is a member of The American Ceramic Society s (ACerS) Refractories Division a co-inventor on a number of international patents and an ardent supporter of science and engineering educational outreach activities.
Chat OnlineImproved spinel-containing refractory castables for
Jun 01 2013 · Hence the corrosion resistance of spinel-containing alumina based castables against the tested acidic brown coal ash depends first of all on the total amount of spinel phase and second of all on the content of CA 6 phases as the presence of CA 6 and CA 2 in the crucible causes interaction of the slag with the refractory. The open porosity and
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Recent advances in refractoriesaluminate binders
Corpus ID . Recent advances in refractoriesaluminate binders and calcium aluminate bonded high-performance monolithic castables article Parr2013RecentAI title= Recent advances in refractoriesaluminate binders and calcium aluminate bonded high-performance monolithic castables author= C. Parr and H. Fryda and C. W "o eyer journal= Journal of The South African Institute
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Development of Refractory Materials for Ladle LiningRS
Sep 30 2020 · The prefabricated block of the gel-magnesia fine powder system has good slag resistance and thermal shock performance due to the in-situ generation of magnesia-alumina spinel and is suitable for the working lining of the clad molten pool. Starting in 2018 the steel plant eliminated corundum spinel machine-made bricks.
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Development of Refractory Materials for Ladle LiningRS
Sep 30 2020 · The prefabricated block of the gel-magnesia fine powder system has good slag resistance and thermal shock performance due to the in-situ generation of magnesia-alumina spinel and is suitable for the working lining of the clad molten pool. Starting in 2018 the steel plant eliminated corundum spinel machine-made bricks.
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PREMIUM ALUMINA FOR REFRACTORY APPLICATIONS
to the refractory products. The coarser fractions add thermal shock and corrosion resistance. All Almatis alumina-based aggregates are manufactured from high purity raw materials. The well-controlled production processes result in very homogeneous pure products for produc-ing high quality refractories. High performance matrix products
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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.
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Industrial Minerals Networking IMFORMEDRefractory
Mag-spinel SiC nano-silica for cement kilns. Regarding cement kiln refractories R. von der Heyde RHI AG et al concluded that as chemical attack particularly from the intense use of alternative fuel is steadily increasing standard refractory concepts are reaching their
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Melt Shop RefractoriesVesuvius
Today s melt shop is under increasing pressure to improve productivity temperature control metal cleanliness. A broad range of monolithic and precast products are available and Foseco personnel are on hand to offer advice on product selection maintenance and design.
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SPINEL-BASED REFRACTORIES FOR IMPROVED PERFORMANCE IN
Oak Ridge National Laboratory in collaboration with refractory manufacturer Minteq International Inc. academic partner Missouri University of Science and Technology and refractory end users have developed novel refractory systems and techniques to reduce energy consumption of refractory lined vessels. The objective of this U.S. DOE funded project was to address the need for innovative
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Basic Shaped RefractoriesIspatGuru
Pitch Spinel Basic Shaped Refractories. Basic shaped refractories are those refractories which have resistance to corrosive reactions with chemically basic slags dusts and fumes at elevated temperatures. They are both MgO and CaO based refractories or in combination between them or in combination between MgO and Cr2O3.
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Influence of MgAl2O4 Spinel Addition on Properties of
December 2016 Influence of MgAl 2O 4 Spinel Addition on Properties of Alumina-Chrome Refractory 449 Table 3 Chemical composition of the slag. Chemical composition SiO 2 Fe 2O 3 CaO MgO Al 2O 3 S Cu Mass fraction (wt ) 28 60 1 1 5 2 3 III. Results and Discussion (1) Characterization of sintered refractory
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Functional Spinel-Binder Based Additives for Improved MgO
In order to improve thermomechanical and chemical performance MA-spinel raw materials alumina-rich spinel and highly reactive spinel binder/clinker have been introduced in the composition.
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Improved thermal shock performance of Al2O3–C refractories
Mar 01 2012 · The combination of nanoscaled powders based on carbon nanotubes and alumina nanosheets lead to superior thermal shock performance with approximately 30 less residual carbon in comparison to commercial available material compositions.
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Refractory Improves Productivity by Increasing Aluminum
Spinel no Longer an Issue. The new refractories have been in place on the walls for about 15 years. Spinel is no longer an issue. The elimination of spinel growth saves considerable time in cleaning the furnace when changing alloys. In some cases Indalco can now completely clean the furnace with a
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Refractoriessummaryplanet
Broadly speaking basic refractories generally fall into one of five compositional areas 1. Products based on deadburned magnesite or magnesia. 2. Products based on deadburned magnesite or magnesia in combination with chrome-containing materials such as chrome ore. 3. Deadburned magnesite or magnesia in combination with spinel. 4.
Chat OnlinePerformance Requirements of Al2O3-MgO·Al2O3 Refractory
Nov 28 2020 · The ω (MgO) in the spinel used in this type of Al2O3-MgO·Al2O3 castables is 10 to 30 and ω (Al2O3) is 70 to 90 . The choice of spinel particles in castables is usually determined by test results. The particle size of MgO·Al2O3 (20 content) has an effect on the infiltration of slag into the Al2O3-MgO·Al2O3 system.
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MODIFIED IN SITU SPINEL-ALUMINA CASTABLES
ly it became essential for refractory producers and researchers to opt for suitable high performance mono-lithic castables to cater for the needs of today and tomorrow 3 4 . In the modern ladles spinel-bonded high alumina based castables with desired service life are extensively used because of the appreciated quali-ties of magnesium
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Corrosion of MgAl2O4 Spinel with Different Al2O3 Contents
2 Q. J. Chen W. Yan and N. Li Influence of contents of pre-synthesized spinel on the microstructures and mechanical properties of the lightweight corundum-spinel refractory castables Key Eng. Mater. 697(2016) .
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Influence of MgAl2O4 Spinel Addition on Properties of
December 2016 Influence of MgAl 2O 4 Spinel Addition on Properties of Alumina-Chrome Refractory 449 Table 3 Chemical composition of the slag. Chemical composition SiO 2 Fe 2O 3 CaO MgO Al 2O 3 S Cu Mass fraction (wt ) 28 60 1 1 5 2 3 III. Results and Discussion (1) Characterization of sintered refractory
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Innovative Refractory Technology for Coreless Induction
Silica‐based refractories have long been the standard for foundries using coreless furnaces to melt iron and iron alloys. Traditional lining materials include a high purity silica aggregate with a boron‐ based heat-set binder generally in the form of either boron oxide or boric acid.
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Basic Shaped RefractoriesIspatGuru
Pitch Spinel Basic Shaped Refractories. Basic shaped refractories are those refractories which have resistance to corrosive reactions with chemically basic slags dusts and fumes at elevated temperatures. They are both MgO and CaO based refractories or in combination between them or in combination between MgO and Cr2O3.
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