steel ladle castable manufacturingevolution of an alumina magnesia self forming spinel
(PDF) Spinel-containing alumina-based refractory castables
Important aspects for spinel forming castables in steel ladle side walls are the expansion of the material under constraint conditions during use and the sintering depth in the lining.
Chat OnlineWear mechanisms of Al2O3-MgO spinel-forming refractories
Jan 10 2014 · Refractory castables containing alumina-magnesia/self-forming spinel (MgAl 2 O 4) 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.
Chat OnlineEngineered expansion routes for alumina-magnesia castables
To attain better performance in steel ladle applications the engineered microstructural design of alumina-magnesia castables is presented and discussed based on spinel and CA(6) formation and its
Chat OnlineEngineered expansion routes for alumina-magnesia castables
To attain better performance in steel ladle applications the engineered microstructural design of alumina-magnesia castables is presented and discussed based on spinel and CA(6) formation and its
Chat OnlineIn-situ formation or pre-formed spinel addition which one
In addition pre-formed spinel was used as aggregate replacing tabular alumina in alumina-magnesia compositions to analyze the effect of coarse particles in the expansion behavior of this type of castable.
Chat OnlineEvolution of in Situ Refractories in the 20th Century
Feng Wang Pingan Chen Xiangcheng Li and Boquan Zhu Effect of micro-spinel powders addition on the microstructure and properties of alumina refractory castables Ceramics International 10.1016/j.ceramint.2018.10.049 (2018).
Chat OnlineCalcium aluminate cement and its effects on in-situ spinel
ABSTRACT. 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.
Chat OnlineCorrosion resistance of alumina-magnesia castable to slag
Key-words Refractory Corrosion resistance Castable Slag Steel ladle Received June 10 2011 Accepted August 30 2011 1. Introduction Alumina-magnesia castables have been used as refractory for lining steel ladles.1) 2) The castables are composed of alumina aggregates and fine-grain matrix consisting of alumina magnesia
Chat OnlineCorrosion of High Alumina Spinel Castables by Steel Ladle Slag
The application of high alumina materials with additions of spinel and/or spinel forming magnesia as wear linings in steel ladles has increased in recent years. Resistance to steel slag is the most
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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.
Chat OnlineCharles Schacht Refractories Handbook 2004 2nv85jr9rolk
Phases other than corundum (from the fused alumina—labeled "A") were hercynite (labeled "H") calcium hexaluminate and glass. The fused alumina aggregate appears to dissolve in the slag and form hercynite (iron aluminate spinel) at the aggregate s periphery. Corrosion of Refractories Figure 12 59
Chat OnlineMicrosilica role in the CA6 formation in cement-bonded
Aug 01 2009 · Alumina–magnesia and alumina–spinel castables were designed considering the Alfred packing model with q = 0.26 (Funk and Dinger 1992).Both of them comprised coarse tabular alumina (d ≤ 6 mm Almatis Germany) as aggregates and as matrix components 6 wt. of calcium aluminate cement (Secar 71 Kerneos France) fine tabular alumina (d ≤ 200 μm Almatis Germany)
Chat OnlinePhase 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
Chat OnlineEffect of spinel content on hot strength of alumina-spinel
Nov 01 1999 · Alumina-spinel castables are being widely used as steel ladle linings to replace high alumina bricks due to the world wide shortage of bricklayers and increasing labor costs.
Chat OnlineIssue 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.
Chat OnlineUSACastable refractory materialGoogle Patents
The castable refractory material comprising as binders per 100 parts by weight of solid components (a) 10-30 parts by weight of water-inactive fine refractory powder which is a mixture of fine refractory powder having an average diameter of 0.2-0.6 μm and fine refractory powder having an average diameter of 1-10 μm at a ratio of 1 2-2 1 (b) 2-7 parts by weight (as an effective amount
Chat OnlineFull article Review on the elaboration and
Apr 20 2018 · Above 1000 °C the refractory castables begin to sinter owing to a transitory liquid phase the crystallization of calcium aluminate cement phases and the self-forming spinel phase. At higher firing temperatures the sintering process leads to a strengthening of the mechanical properties.
Chat OnlineCharles Schacht Refractories Handbook 2004 Refractory
Phases other than corundum (from the fused aluminalabeled A) were hercynite (labeled H) calcium hexaluminate and glass. The fused alumina aggregate appears to dissolve in the slag and form hercynite (iron aluminate spinel) at the aggregates periphery. Corrosion of Refractories. 59. Figure 12. Ninety percent Al2O3 brick after ferrous foundry
Chat Online(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.
Chat OnlineEPB1Castable refractory materialGoogle Patents
EPB1 EP EPA EPB1 EP B1 EP B1 EP B1 EP EP EP EP A EP A EP A EP B1 EP B1 EP B1 Authority EP European Patent Office Prior art keywords refractory powder fine alumina weight Prior art date Legal status (The legal
Chat OnlineCalcium aluminate cement and its effects on in-situ spinel
ABSTRACT. 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.
Chat OnlineThe interface reaction between ladle-lining refractories and the molten steel and introduce the resulting influences on the formation of inclusions was focused and it was found that the ladle lining refractory material will affect the morphology composition and physical and chemical properties of the inclusions in the steel.
Chat Online(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.
Chat OnlineEffect of spinel content on slag attack resistance of high
High alumina refractory castables based on the Al 2 O 3-MgO-CaO diagram ternary system were prepared using tabular alumina white electrofused corundum calcined alumina synthetic spinel dead-burned magnesia dolomite and calcium aluminate cement as starting raw materials.Two kinds of slags with 9.02 and 4.14 CaO/SiO 2 ratios were studied for slag resistance by means of crucible tests.
Chat OnlineIn-situ formation or pre-formed spinel addition which one
In addition pre-formed spinel was used as aggregate replacing tabular alumina in alumina-magnesia compositions to analyze the effect of coarse particles in the expansion behavior of this type of castable.
Chat OnlineInfluence of gel-derived nanocrystalline spinel in a high
Jan 01 2005 · The formulation of original spinel-free castable was estimated by the optimum packing efficiency calculated from the distribution modulus (q-value) of the composition .In this respect the particle size distribution and amount of different constituents e.g. white fused alumina (−6 16 −16 30 −30 60 −100 mesh BS) and other finer fractions were given special consideration.
Chat OnlineSpinel-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.
Chat OnlineReview on the elaboration and characterization of ceramics
Above 1000 °C the refractory castables begin to sinter owing to a transitory liquid phase the crystallization of calcium aluminate cement phases and the self-forming spinel phase. Using minerals of dolomite serpentine and magnesite produce a new composite material which provides an expansive stress to decrease deformation and fracture of
Chat OnlineEffect of spinel content on slag attack resistance of high
High alumina refractory castables based on the Al 2 O 3-MgO-CaO diagram ternary system were prepared using tabular alumina white electrofused corundum calcined alumina synthetic spinel dead-burned magnesia dolomite and calcium aluminate cement as starting raw materials.Two kinds of slags with 9.02 and 4.14 CaO/SiO 2 ratios were studied for slag resistance by means of crucible tests.
Chat OnlineCimento 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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