evolution of an alumina magnesia self forming spinelalumina magnesia refractory castables
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
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All articlesJournal of Ceramic Science
This work addresses the microstructure and phase evolution of four designed high-alumina refractory castables (containing ρ-Al2O3 or calcium aluminate cement as a binder source and 0
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Formation mechanism of calcium hexaluminate SpringerLink
Oct 12 2016 · To investigate the formation mechanism of calcium hexaluminate (CaAl12O19 CA6) the analytically pure alumina and calcia used as raw materials were mixed in CaO/Al2O3 ratio of 12.57 137.43 by mass. The raw materials were ball-milled and shaped into green specimens and fired at 1300–1600°C. Then the phase composition and microstructure evolution of the fired specimen were
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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
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Issue No. 3 December
Nevertheless for higher cement alumina content castables the formation of micro cracks is observed in refractory castables into which slag deposit can penetrate. The slag reacts with alumina to form a new phase such as hibonite (CA6) and calcium dialuminate (CA2). The expansive reactions involving CA2 and CA6 lead to macro-cracks.
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Spinel-containing alumina-based refractory castables
Aug 01 2011 · In the literature the expansion behaviour of alumina-magnesia refractory castables is commonly related to the in situ spinel generation.
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EPB1Hydraulically-bonded monolithic refractories
EPB1 EPA EPA EPB1 EP B1 EP B1 EP B1 EP A EP A EP A EP A EP A EP A EP B1 EP B1 EP B1 Authority EP European Patent Office Prior art keywords refractory weight hydraulically fines alumina Prior art date Legal status (The
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Phase Composition of Bauxite-based Refractory Castables
Short communication. Phase composition of bauxite-based refractory castables Morsy M. Abou-Sekkina a Salah A. Abo-El-Enein b Nagy M. Khalil c Osama A. Shalma d a Department of Chemistry Faculty of Science Tanta University Tanta Egypt b Department of Chemistry Faculty of Science Ain Shams University Cairo Egypt c Refractories Ceramics and Building Materials Department National
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Study of Al2O3 MgO Refractory Castables Corrosion by
Refractory castables containing alumina-magnesia/self-forming spinel (MgAl2O4) are used in impact pads of steel ladles in steelmaking processes. In order to understand the wear mechanisms of refractory materials several recipes were tested from a corrosion slag resistance and thermal shock point of view.
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Processes Free Full-Text Synthesis of Magnesium
Synthesis of magnesium aluminate spinel (MgAl2O4) was investigated by employing ball milling and co-precipitation methods. The starting materials (aluminum hydroxides) were obtained from the purified sodium hydroxide leaching solution of black dross. The characteristics of the synthesized spinel was analyzed through X-ray diffraction (XRD) scanning electron microscopy (SEM) images.
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In-situ formation or pre-formed spinel addition which one
These benefits could be attained in high alumina refractory castable by adding pre-formed spinel or magnesia in order to result in the latter condition in in-situ spinel during the first use of the lining.
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Formation mechanism of calcium hexaluminate SpringerLink
Oct 12 2016 · To investigate the formation mechanism of calcium hexaluminate (CaAl12O19 CA6) the analytically pure alumina and calcia used as raw materials were mixed in CaO/Al2O3 ratio of 12.57 137.43 by mass. The raw materials were ball-milled and shaped into green specimens and fired at 1300–1600°C. Then the phase composition and microstructure evolution of the fired specimen were
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USAHydraulically-bonded monolithic refractories
This invention relates to cement-free refractories exhibiting high green strength improved corrosion resistance and improved magnesium oxide hydration resistance useful as refractory castables for steel ladles slag contact areas ladle sidewalls and bottoms and the like and as precast refractory shapes such as well blocks nest blocks and the like.
Get PriceNovel calcium hexaluminate/spinel-alumina composites with
Calcium hexaluminate (CA6) was incorporated into the matrix of magnesio aluminate spinel-alumina (MA-A) via infiltration of a porous preform fabricated from α-Al2O3 and MgO powders with a
Get PricePhase Composition of Bauxite-based Refractory Castables
Short communication. Phase composition of bauxite-based refractory castables Morsy M. Abou-Sekkina a Salah A. Abo-El-Enein b Nagy M. Khalil c Osama A. Shalma d a Department of Chemistry Faculty of Science Tanta University Tanta Egypt b Department of Chemistry Faculty of Science Ain Shams University Cairo Egypt c Refractories Ceramics and Building Materials Department National
Get PriceNovel Features of Nanoscaled Particles Addition to Alumina
As conducted by Braulio et al. 7 the evaluation of adding different magnesia and alumina grain sizes to spinel-forming refractory castables was carried out based on a reference composition
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Advanced Refractory Technology Ceramics Mining Free
high-alumina castables).14 Other pos- surfaces in a process known as Wagner s alloying aluminum and magnesium or sible mechanisms involve vaporization mechanism. Differences in the ion-dif- their salts and hydroxides or by copre- particle sliding and capillary forces fusion rate in the spinel layer and the cipitating magnesium and aluminum
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Phase Composition of Bauxite-based Refractory Castables
Short communication. Phase composition of bauxite-based refractory castables Morsy M. Abou-Sekkina a Salah A. Abo-El-Enein b Nagy M. Khalil c Osama A. Shalma d a Department of Chemistry Faculty of Science Tanta University Tanta Egypt b Department of Chemistry Faculty of Science Ain Shams University Cairo Egypt c Refractories Ceramics and Building Materials Department National
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Evolution of an alumina-magnesia/self-forming spinel
Keywords Refractories magnesium aluminate spinel castable alumina-magnesia refractory lining MgAl 2 O 4 MgO-Al 2 O 3 Resumo Este estudo foi desenvolvido juntamente com a pesquisa descrita na parte I (Cerâmica 45 (1999) 93-98) sobre as característic as microestruturais de um refratário espinélio de alumina com várias
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(Calcium aluminate cement and its effects on in-situ
Calcium aluminate cement (CAC) bonded alumina-magnesia refractory castables present great advantages for steel ladle applications as a result of in-situ expansive formation of spinel and CA 6 which leads to high basic slag and thermal shock resistance.The CAC content in those castables strongly influences its expansive behavior mainly due to CA 6 formation.
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Study of Al2O3 MgO Refractory Castables Corrosion by
Refractory castables containing alumina-magnesia/self-forming spinel (MgAl2O4) are used in impact pads of steel ladles in steelmaking processes. In order to understand the wear mechanisms of refractory materials several recipes were tested from a corrosion slag resistance and thermal shock point of view.
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Improved high temperature thermal shock resistance of high
Improved high temperature thermal shock resistance of high alumina refractory monolithics thanks to in-situ spinel formation in a smart matrix. A. Lee W. E. Microstructural evolution in self-forming spinel/calcium aluminate castable refractories J. Eur. Ceram. Dannert C. Holleyn F. Krause O. How does the spinel formation
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(Calcium aluminate cement and its effects on in-situ
Calcium aluminate cement (CAC) bonded alumina-magnesia refractory castables present great advantages for steel ladle applications as a result of in-situ expansive formation of spinel and CA 6 which leads to high basic slag and thermal shock resistance.The CAC content in those castables strongly influences its expansive behavior mainly due to CA 6 formation.
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Issue No. 1Techna Group
Nevertheless for higher cement alumina content castables the formation of micro cracks is observed in refractory castables into which slag deposit can penetrate. The slag reacts with alumina to form a new phase such as hibonite (CA6) and calcium dialuminate (CA2). The expansive reactions involving CA2 and CA6 lead to macro-cracks.
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USAAlumina-silicon carbide-carbon refractory
A refractory castable comprised of about 45 to about 75 by weight high alumina grain about 2 to about 35 by weight silicon carbide about 1 to about 8 by weight carbon about 1 to about 8 by weight calcium aluminate cement and about 1 to about 10 by weight fine magnesium aluminate spinel the spinel having a grain size of less than about 150 μm (100 Tyler mesh) and being
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Cimento aluminoso e seus efeitos em concretos refratários
Calcium aluminate cement (CAC) bonded alumina-magnesia refractory castables present great advantages for steel ladle applications as a result of in-situ expansive formation of spinel and CA< 6 which leads to high basic slag and thermal shock resistance. The CAC content in those castables strongly influences its expansive
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In-situ formation or pre-formed spinel addition which one
These benefits could be attained in high alumina refractory castable by adding pre-formed spinel or magnesia in order to result in the latter condition in in-situ spinel during the first use of the lining.
Get Price
All articlesJournal of Ceramic Science
This work addresses the microstructure and phase evolution of four designed high-alumina refractory castables (containing ρ-Al2O3 or calcium aluminate cement as a binder source and 0
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Microstructural evolution in self-forming spinel/calcium
Jan 01 1998 · Calcium aluminate bonded alumina-spinel castable refractories have been fabricated with in-situ spinel formation. Spinel formation occurs between 1200 and 1400 °C with a net-like morphology interlinked with CaO-MgO-Al 2 O 3 -SiO 2 phases.
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