magnesia grain size effect on in situ spinel refractorymagnesia alumina spinel castable

Size-dependent hydration mechanism and kinetics for

 · The effect of starting grain size on the hydration behavior of reactive magnesia and hydratable nano-/micro-alumina hydrating mixtures was investigated and analyzed by microcalorimetry at 50 °C. The heat flow curves for the hydrating Mg–Al cementitious matrices prepared by in situ mixing condition all normalized to mass of powder are

The Influence of TiO 2 Addition on the Modulus of Rupture

 · The addition of TiO2 to alumina-magnesia refractory castables could accelerate the in situ spinel and calcium hexa-aluminate (CA6) formation and change the phase evolution which will have direct effect on the overall modulus of rupture values. The cold (CMOR) and hot (HMOR) modulus of rupture thermal expansion and elastic modulus of alumina-magnesia refractory castables with

A Review on Recent Advances on Magnesia-Doloma

The grain size of doloma with Fe 2 O 3 addition is bigger than that without additive. Hydration resistance was related to densification and grain size of sintered dolomite. H. A. Yeprem investigated the effect of iron oxide addition on the hydration resistance and bulk density of doloma.

E.Y.Sako M.A.L.Braulio V.C.Pandolfelli

 · situ spinel which was already generated at Fig. 2 SEM images of alumina-magnesia castable containing MgO <45 µm after firing at 1000 1150 1300 and 1500 °C (APS = average pore size in the matrix) Fig.3Microstructure of the castables AM1 AM2 and AM3 after firing at 1500 °C for 5 h

Effect of spinel content on the properties of magnesia

Experimental Physical properties Calcined magnesia (supplied by Nedmag Industries Specific gravity 3.60 Phase content Spinel The Netherlands) and calcined alumina (supplied by Specific surface area (m2gm 1) 4.0 Indian aluminium Company India) were first evaluated A. Ghosh et al. / Journal of the European Ceramic Society 24 (2004) 2079

(PDF) Development of carbon containing castables for steel

6 Braulio M.A.L Bittencourt L.R.M. and Stability of cast shapes Pandolfelli V.C. Magnesia grain size effect on in No crack formation and hydration of the block was situ spinel refractory castables J.Euro. Ceram. observed (Fig. 5) even after 15 days of demoulding Soc. 2008 (28) . followed with a heat treatment at 700°C

‪Victor Carlos Pandolfelli‬‪Google Scholar‬

Magnesia grain size effect on in situ spinel refractory castables MAL Braulio LRM Bittencourt VC Pandolfelli Journal of the European Ceramic Society 28 (15) 2008

Porogenesis in the Alumina-Brucite-Magnesia-Spinel System

 · Abstract Magnesium monoaluminate spinel (MgAl2O4) is an important raw material for the refractory industry and its in-situ formation from Al2O3 and MgO sources is an expansive process due to

Microsilica or MgO grain size Which one mostly affects

 · Microsilica is commonly added to alumina–magnesia castables to counterbalance the in situ spinel expansion. This effect is attained by the generation of a low-melting temperature phase which also affects the expansive reaction kinetics. Additionally the MgAl 2 O 4 formation depends on the grain size

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).

Ceramics Special Issue Design Properties Damage and

 · The alumina raw materials react with magnesia forming a spinel which decreases open porosity and slag infiltration. The amount grain size and chemistry of the added spinel impact the properties of spinel-containing MgO-C. Corrosion tests have been performed in a steel casting simulator at 1580 °C using 18CrNiMo7-6 steel and Fe-rich slag as

From Macro to Nanomagnesia Designing the in situ Spinel

Magnesia grain size affects the in situ spinel formation kinetics and expansion of alumina–magnesia refractory castables. The use of coarse grains results in a large expansion and delays the reaction s starting temperature. In this work the addition of an MgO source with different grain sizes (from macro Dmax≤0.1 mm to nano D50≤20 nm) led to a broad linear expansion range (6 –2

Study on the effect of the effect of different raw

 · magnesia alumina spinel is higher than that of magnesia at the same temperature. For example the solid solubility of MgO and Al 2 O 3 at 1600℃ are 2 and 6 wt. respectively but increase to 3 and 10 wt. respectively at 1700℃. Clearly it is more likely that single-phase magnesia alumina spinel is alumina-rich and this can be

Papersrefractories-worldforum

 · Impact of Magnesia Grain Size on the In Situ Spinel Formation in Al 2 O 3 –MgO–C Refractories. Ali Baghaei Homeyra Heydari Boroujeni Mehdi Naeemi. Volume 10 Issue 2 Pages 8085. Keywords alumina-magnesia-carbon spinel grain size carbon containing refractories. Abstract References Full Article

Size-dependent hydration mechanism and kinetics for

 · The effect of starting grain size on the hydration behavior of reactive magnesia and hydratable nano-/micro-alumina hydrating mixtures was investigated and analyzed by microcalorimetry at 50 °C. The heat flow curves for the hydrating Mg–Al cementitious matrices prepared by in situ mixing condition all normalized to mass of powder are

Selection of binders for in situ spinel refractory

 · Alumina–magnesia castables are widely known for their expansive behavior due to in situ spinel (MgAl 2 O 4) formation at temperatures higher than 1000 °C.1 2 3 Various parameters can affect this reaction the MgO1 3 and alumina 4 grain sizes the microsilica content 5 6 the refractory aggregates nature 7 among others. In addition the binder system selected for this class of castables

Porogenesis in the Alumina-Brucite-Magnesia-Spinel System

 · Porogenesis in the Alumina-Brucite-Magnesia-Spinel System. Abstract Magnesium monoaluminate spinel (MgAl 2 O 4) is an important raw material for the refractory industry and its in-situ formation from Al 2 O 3 and MgO sources is an expansive process due to its low density.

Optimization of Properties for Alumina-Spinel Refractory

Alumina-magnesia and alumina-spinel castables have been widely used in steel ladle linings below the slag zone the well block of purging plugs and injection lances due to their excellent slag resistance and mechanical properties 1 2 .In view of the increasing ratio of scrap to steel higher working temperature and prolonged refining time the enhanced properties of materials especially

Spinel In situ versus PreformedClearing the Myth

 · effect of spinel-types spinel grain size and amount of spinel on the chemical and me-chanical resistance of alumina-spinel cast-ables 1–5 . In the past ten years the cast-ables used for the ladle side wall have pro-gressively changed from alumina-spinel castables to alumina-magnesia types. One driver for this change was the consideration

(PDF) In situ Spinel Expansion Design by Colloidal Alumina

Considering the alumina grain size effect on the in situ spinel formation and the associated overall volumetric expansion alumina-magnesia refractory castables containing different alumina sources were evaluated by the assisted sintering technique.

Effect of spinel content on the properties of magnesia

Experimental Physical properties Calcined magnesia (supplied by Nedmag Industries Specific gravity 3.60 Phase content Spinel The Netherlands) and calcined alumina (supplied by Specific surface area (m2gm 1) 4.0 Indian aluminium Company India) were first evaluated A. Ghosh et al. / Journal of the European Ceramic Society 24 (2004) 2079

Magnesia grain size effect on in situ spinel refractory

 · Alumina–magnesia castables present an expansive behavior due to in situ spinel formation and the reaction is affected by the magnesia source and its grain size. In this study castables were prepared with different magnesia grain sizes (<45 or <100 μm) and the samples were evaluated by an assisted sintering technique mechanical strength creep resistance and microstructural evaluation.

In situ Spinel Expansion Design by Colloidal Alumina

 · Considering the alumina grain size effect on the in situ spinel formation and the associated overall volumetric expansion alumina–magnesia refractory castables containing different alumina sources were evaluated by the assisted sintering technique. Reducing the size of fine tabular alumina (<200 μm) led to lower expansion levels indicating

11th Biennial Worldwide Conference on Unified

 · effect of grain size of sintered ca o on the hydration resistance of lime refractories and properties of spinel bonded magnesia based ncc role of in-situ and ex-situ alumina ph ase on anomalous setting behavior of calcium aluminate cement

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).

In situ Spinel Expansion Design by Colloidal Alumina

 · Considering the alumina grain size effect on the in situ spinel formation and the associated overall volumetric expansion alumina–magnesia refractory castables containing different alumina sources were evaluated by the assisted sintering technique. Reducing the size of fine tabular alumina (<200 μm) led to lower expansion levels indicating the main role of alumina grain size in this property.

 · . 1 1 1 1 1 2. 1. 421001 2. 430081.

Sintering Studies on Magnesia-Rich Chromium-Free Spinel

Basic bricks with Cr2O3 from chrome ore as the spinel forming oxide are used in the non-ferrous industry because of their corrosion resistance against fayalite-type slags rich in FeO. Our objective in this study was to replace Cr3 with Me4 ions which along with Fe3 could maintain the spinel formation capability with MgO and perform similarly against fayalite slags in non-ferrous furnaces.

Spinel In situ versus PreformedClearing the Myth

 · effect of spinel-types spinel grain size and amount of spinel on the chemical and me-chanical resistance of alumina-spinel cast-ables 1–5 . In the past ten years the cast-ables used for the ladle side wall have pro-gressively changed from alumina-spinel castables to alumina-magnesia types. One driver for this change was the consideration

The Influence of TiO 2 Addition on the Modulus of Rupture

 · The addition of TiO2 to alumina-magnesia refractory castables could accelerate the in situ spinel and calcium hexa-aluminate (CA6) formation and change the phase evolution which will have direct effect on the overall modulus of rupture values. The cold (CMOR) and hot (HMOR) modulus of rupture thermal expansion and elastic modulus of alumina-magnesia refractory castables with

Influence of the Characteristics of Spinels on the Slag

Abstract. The XRD patterns at ambient temperature and at 1500°C showed that the spinel in the Al 2 O 3 –MgO castables fired at 1500°C for 3 h has the higher peak intensity compared to those in Al 2 O 3 –spinel castables the interplanar distance in the set (311) is 2.43 Å for the spinel in Al 2 O 3 –MgO castables as well as the spinels in Al 2 O 3 –spinel castables using spinels