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.

Wear 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.

Engineered 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

Engineered 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

In-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.

Evolution 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).

Calcium 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.

Corrosion 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

Corrosion 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

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.

Charles 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

Microsilica 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)

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

Effect 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.

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.

USACastable 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

Full 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.

Charles 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

(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.

EPB1Castable 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

Calcium 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.

The 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.

(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.

Effect 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.

In-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.

Influence 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.

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.

Review 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

Effect 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.

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