magnesia grain size effect on in situ spinel refractory in italy

magnesia grain size effect on in situ spinel refractory castables

Magnesia grain size effect on in situ spinel refractory castables

1/11/2008 · 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

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magnesia grain size effect on in situ spinel refractory castables

Magnesia grain size effect on in situ spinel refractory castables

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

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(pdf) magnesia grain size effect on in situ spinel refractory castables

(PDF) Magnesia Grain Size Effect on In Situ Spinel Refractory Castables

Magnesia grain size effect on in situ spinel refractory castables M.A.L. Braulio a , L.R.M. Bittencourt b , V .C. Pandolfelli a , ∗ a Federal Univer sity of S˜ ao Carlos, Materials Engineering

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microsilica or mgo grain size: which one mostly affects the in situ spinel refractory castable expansion?

Microsilica or MgO grain size: Which one mostly affects the in situ spinel refractory castable expansion?

1/12/2009 · 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.

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magnesia refractory - an overview | sciencedirect topics

Magnesia Refractory - an overview | ScienceDirect Topics

Magnesia grain also finds use in the preparation of other basic refractories such as magnesia-chrome. The high reactivity of lime with water precludes its use as a refractory in its own right, but calcined dolomite (containing approximately

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(pdf) effect of spinel content on the properties of magnesia–spinel composite refractory | binu mukherjee - academia.edu

(PDF) Effect of spinel content on the properties of magnesia–spinel composite refractory | Binu Mukherjee - Academia.edu

This fine spinel was then added to sintered magnesia grain composition, replacing finer Table 2 fraction of magnesia, at an amount of 10, 20, and 30 Physico-chemical properties of milled spinel wt.%.

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(pdf) refractory applications of magnesium aluminate spinel

(PDF) Refractory applications of magnesium aluminate spinel

The effect of spinel precursor sol on the sintering property of fused magnesia refractory were studied The larger amount and smaller grain size of the in situ spinel in the matrix mostly

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refractory applications of magnesium aluminate spinel

Refractory Applications of Magnesium Aluminate Spinel

situ spinel forming alumina magnesia casta-bles as an alternative to the addition of pre-formed spinel with alumina. The in situ for-mation of spinel while using alumina mag-nesia castables is

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effects of sno2 addition on the properties of alumina-magnesia refractory castables

Effects of SnO2 Addition on the Properties of Alumina-Magnesia Refractory Castables

The grain size of the spinel decreased with the addition of SnO 2 increasing. After soaked for 5 h, CA 6 platelets tended to interlock with each other, and the different phases were jointed tightly (Figure 5). The tin element was detected in CA

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magnesium aluminate spinel raw materials for high performance refractories for steel ladles

Magnesium Aluminate Spinel Raw Materials for High Performance Refractories for Steel Ladles

6 of 13 pieces. Magnesia-rich spinel is used in cement kiln applications, particularly in nose-rings and hot-zones. Alumina-rich spinels Alumina-rich spinels are the largest volume of the refractory spinels, as they are used as components of ref

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from macro to nanomagnesia: designing the in situ spinel expansion - braulio - 2008 - journal of the american ceramic society - wiley online library

From Macro to Nanomagnesia: Designing the in situ Spinel Expansion - Braulio - 2008 - Journal of the American Ceramic Society - Wiley Online Library

2/9/2008 · 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

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(pdf) reaction characteristics of magnesia–spinel refractories with cement clinker

(PDF) Reaction Characteristics of Magnesia–Spinel Refractories with Cement Clinker

The adherence ability of cement clinker on magnesia–spinel refractories is investigated, using a sandwich test, at 1550 C for 30 min under a load of 5.3 kPa. Fractional factorial

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selection of binders for in situ spinel refractory castables

Selection of binders for in situ spinel refractory castables

1/10/2009 · 1. IntroductionAlumina–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

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reaction characteristics of magnesia–spinel refractories with cement clinker, international journal of applied ceramic technology | 10.1111/j

Reaction Characteristics of Magnesia–Spinel Refractories with Cement Clinker, International Journal of Applied Ceramic Technology | 10.1111/j

1/7/2005 · Early developed magnesia−spinel refractories were made of a combination of sintered magnesia and alumina, forming in situ spinel during firing. The content of spinel was limited to about 8%. These bricks exhibited exceptional thermal shock

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in-situ reactions and properties of alumina-magnesia refractory castables with addition of tio2

In-Situ Reactions and Properties of Alumina-Magnesia Refractory Castables with Addition of TiO2

1/6/2015 · In the present work, the phase composition, apparent porosity, permanent linear change and microstructure were examined in castables containing 0–2 mass-% of TiO 2 with and without magnesia to investigate the effect of TiO 2 on in-situ reactions

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the influence of tio2 addition on the modulus of rupture of alumina-magnesia refractory castables

The Influence of TiO2 Addition on the Modulus of Rupture of Alumina-Magnesia Refractory Castables

1/7/2015 · 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.

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porogenesis in the alumina-brucite-magnesia-spinel system

Porogenesis in the Alumina-Brucite-Magnesia-Spinel System

3/7/2020 · 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 its low density. Such an expansion can be a serious

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novel engineered routes for advanced eirich award 09 2o3-mgo refractory castables

Novel Engineered Routes for Advanced EIRICH AWARD 09 2O3-MgO Refractory Castables

situ spinel forming refractory castables. 2 Experimental procedure Tab. 1 summarizes the different composi-tions produced for this study. Initially, differ-ent alumina and magnesia grain sizes were evaluated and nano-scaled powders were prepared

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selection of binders for in situ spinel refractory castables

Selection of Binders for In Situ Spinel Refractory Castables

Alumina-magnesia refractory castables are well known for their expansive behavior which is usually associated to the in-situ spinel formation at temperatures in the range of 1000 and 1500 C.

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spinel: in situ versus preformed – clearing the myth

Spinel: In situ versus Preformed – Clearing the Myth

Spinel: In situ versus Preformed – Clearing the Myth M. Schnabel, A. Buhr, R. Exenberger, C. Rampitsch The paper discusses the differ-ence in the formulation concepts of alumina-spinel (spinel contain-ing) and alumina-magnesia (spinel forming)

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(pdf) in situ spinel expansion design by colloidal alumina suspension addition | matheus piva - academia.edu

(PDF) In situ Spinel Expansion Design by Colloidal Alumina Suspension Addition | Matheus Piva - Academia.edu

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

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improvement of resistance of mgo-based refractory to slag penetration by in situ spinel formation

Improvement of Resistance of MgO-Based Refractory to Slag Penetration by In Situ Spinel Formation

6/1/2015 · MgO-in situ spinel substrate was prepared at 1773 K (1500 °C) using colloidal alumina suspension and coarse MgO as raw materials. While the addition of 10 mass pct colloidal alumina had limited effect, addition of 20 mass pct colloidal alumina

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matheus piva - academia.edu

Matheus Piva - Academia.edu

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

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effect of micron and nano mgal o spinel addition on the properties of magnesia-carbon refractories

EFFECT OF MICRON AND NANO MgAl O SPINEL ADDITION ON THE PROPERTIES OF MAGNESIA-CARBON REFRACTORIES

EFFECT OF MICRON AND NANO MgAl2O4 SPINEL ADDITION ON THE PROPERTIES OF MAGNESIA-CARBON REFRACTORIES A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF Master of Technology

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from macro to nanomagnesia: designing the in situ spinel expansion | semantic scholar

From Macro to Nanomagnesia: Designing the in situ Spinel Expansion | Semantic Scholar

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

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study on the effect of the effect of different raw materials sources on spinelization and densification of mgo-al o spinel

Study on the effect of the effect of different raw materials sources on spinelization and densification of MgO-Al O spinel

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

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effect of in situ spinel seeding on synthesis of mgo-rich mgal2o4 composite

Effect of in situ spinel seeding on synthesis of MgO-rich MgAl2O4 composite

10/5/2007 · They also reported that incorporation of 20 wt.% MgAl 2 O 4 spinel in production of MgO refractory has great influence in improving the lower mechanical/thermo-mechanical properties []. The author also found that the 3-pt bending strength

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effects of mno additions on the properties of alumina-magnesia refractory castables

EFFECTS OF MnO ADDITIONS ON THE PROPERTIES OF ALUMINA-MAGNESIA REFRACTORY CASTABLES

China, 95 % purity), calsium aluminate cement (Secar71, Kerneos, France), silica fume (951U, Elkem, Norway) and MnO (Aladdin, America, 99.5 purity). The compositions of the alumina-magnesia refractory castables are listed in Table 1.Tabular

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spinel: in-situ versus preformed – clearing the myth

Spinel: In-situ versus Preformed – Clearing the Myth

The paper discusses the difference in the formulation concepts of alumina-spinel (spinel containing) and alumina-magnesia (spinel forming) castables and the influence on their physical properties. The individual property profile will be

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influence of the characteristics of spinels on the slag resistance of al2o3–mgo and al2o3–spinel castables - ko - 2000 - journal of the

Influence of the Characteristics of Spinels on the Slag Resistance of Al2O3–MgO and Al2O3–Spinel Castables - Ko - 2000 - Journal of the

Influence of the Characteristics of Spinels on the Slag Resistance of Al 2 O 3 –MgO and Al 2 O 3 –Spinel Castables Authors Yung-Chao Ko China Steel Corporation, Kaohsiung, Taiwan, Republic of China Search for more papers by this author * First

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in situ spinel expansion design by colloidal alumina suspension addition - braulio - 2009 - journal of the american ceramic society - wiley online

In situ Spinel Expansion Design by Colloidal Alumina Suspension Addition - Braulio - 2009 - Journal of the American Ceramic Society - Wiley Online

13/2/2009 · The incorporation of nano powders into refractory castables it is not a straightforward procedure, due to their agglomeration and sintering drawbacks. Considering the alumina grain size effect on the in situ spinel formation and the associated

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(pdf) effect of in situ spinel seeding on synthesis of mgo-rich mgal 2 o 4 composite | deepak mohapatra - academia.edu

(PDF) Effect of in situ spinel seeding on synthesis of MgO-rich MgAl 2 O 4 composite | Deepak Mohapatra - Academia.edu

Effect of in situ spinel seeding on synthesis of MgO-rich MgAl 2 O 4 composite Deepak Mohapatra From the microstructure, the average grain size~5 lm of MAS1 calcined at 1,000 C and sintered at 1,600 C/4 h may exhibit improved room

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(pdf) preparation of mgo–mgal 2o 4 composite for refractory application | deepak mohapatra - academia.edu

(PDF) Preparation of MgO–MgAl 2O 4 composite for refractory application | Deepak Mohapatra - Academia.edu

Effect of in situ spinel seeding on synthesis of MgO-rich MgAl 2 O 4 composite By Deepak Mohapatra The influence of additives on microstrucutre of sub-micron alumina ceramics prepared by two-stage sintering

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effects of slag chemistry and temperature on wetting and penetration of refractories by slags

Effects of slag chemistry and temperature on wetting and penetration of refractories by slags

magnesia spinel refractory, respectively. The results showed that temperature has a significant effect on slag penetration into both the synthetic alumina sample and the magnesia refractory. At 1470ºC, the penetrated slag reached the top of the

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(pdf) development of carbon containing castables for steel ladle applications | sathiyakumar m - academia.edu

(PDF) Development of carbon containing castables for steel ladle applications | Sathiyakumar M - Academia.edu

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

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functional spinel-binder based additives for improved mgo–c performance in ladle applications

Functional Spinel-Binder Based Additives for Improved MgO–C Performance in Ladle Applications

2/5/2017 · 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. The impact of spinel or spinel forming phases on

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roghayeh nikbakht - postdoc fellow & university lecturer - university of ottawa

Roghayeh Nikbakht - Postdoc Fellow & University Lecturer - University of Ottawa

• In situ spinel formation of Alumina–magnesia castables was explored In situ spinel formation and the reaction is affected by the magnesia source and its grain size • Castables were prepared with different magnesia grain sizes and different

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in-situ gravimetric studies of wetting, penetration and wear of refractories by molten slags

In-Situ Gravimetric Studies of Wetting, Penetration and Wear of Refractories by Molten Slags

in the system of CaO-SiO2-Al2O3-MgO and a magnesia spinel brick were studied and effect of refractory sample size and addition of 5 wt% FeOx in the slag were investigated. Studies on a second model system investigated attack by a calcium ferrite

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improving corrosion behaviour of magnesia-chrome refractories by addition of nanoparticles

Improving Corrosion Behaviour of Magnesia-chrome Refractories by Addition of Nanoparticles

17/10/2013 · The effect of nano-Cr2O3 on solid-solution assisted sintering of MgO refractories. Ceram. Int. 38 (2012) [8] 6235–6241 [16] Braulio, M.A.L.; et al.: Microsilica or MgO grain size: Which one mostly affects the in situ spinel refractory castable

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unshaped refractories

Unshaped Refractories

Different parameters (i.e., particle size distribution and packing, size and amount of coarse grains, and other features of the resulting microstructure) can affect the erosion resistance of refractory castables. read more

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