Optimization of Properties for Alumina-Spinel Refractory
· Aiming at optimizing properties of alumina-spinel refractory castables coarse corundum particles were replaced partially with the particles of a novel porous multi-component CMA (CaO-MgO-Al 2 O 3) aggregate in the same size.Properties including the bulk density apparent porosity strength slag corrosion resistance thermal shock resistance and thermal fatigue resistance of alumina-spinel
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Effect of Alumina on the Behavior of V-Rich Spinel Phase
· With an increase in the alumina content from 2 to 10 mass pct the vanadium content in the spinel phase decreased from 28 to 33 mass pct to approximately 10 mass pct. From these results it can be concluded that the increase in alumina content and decrease in basicity of the slag are unfavorable for the enrichment of vanadium present in the spinel.
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Effect of Hercynite Spinel on the Technological Properties
· Magnesia-calcium zirconate (MCZ) composite products have been tested in the transition zones of cement kilns. Such products are of interest because they are environmentally safe and demonstrate high resistance when exposed to cement clinker at elevated temperatures. Such modifiers as hercynite spinel FeO·Al2O3 (FA) can be added in small quantities to MCZ products to enhance
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Effect of Spinel Content on the Reaction of Porous
Effect of Particle Size Distribution of Raw Materials on Properties of Magnesia-Alumina Refractory p.595. Preparation and Properties of Lightweight High-Strength Insulation Materials Using Fly Ash Floating Beads and the effect of the spinel content on the reaction between porous periclase-spinel ceramics and cement clinker was
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Effect of Alumina on the Behavior of V-Rich Spinel Phase
· With an increase in the alumina content from 2 to 10 mass pct the vanadium content in the spinel phase decreased from 28 to 33 mass pct to approximately 10 mass pct. From these results it can be concluded that the increase in alumina content and decrease in basicity of the slag are unfavorable for the enrichment of vanadium present in the spinel.
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IMPACT OF DISPERSANTS ON THE MECHANICAL STRENGTH
The effect of four commercial dispersants on the properties of alumina-spinel self-flowing refractory castables was investigated. The self-flow value water demand physical and mechanical properties as well as microstructure of these castables were evaluated. The results showed that the polycarboxylate ether is the most effective dispersant in increasing self-flowability because of its
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Effect of CaO Content on the Hot Strength of Alumina
· Effect of CaO Content on the Hot Strength of Alumina‐Spinel Castables in the Temperature Range of 1000° to 1500°C. Member American Ceramic Society. Member American Ceramic Society. Cement notation C is CaO and A is Al 2 O 3 e.g. CA 6 is CaO·6Al 2 O 3 .
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Influence of Spinel on the Fracture Energy of Refractory
The specific fracture energy of alumina-spinel refractory castables was studied by the wedge-splitting method in this paper. The influence of synthetic spinel on the specific fracture energy of aluminamagnesia refractory castables was investigated. In-situ formation spinel was replaced by sintering spinel as the synthetic spinel. The experimental results indicated that the specific fracture
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EFFECT OF Li5AlO4 ADDITIONS ON THE SINTERING AND
· aluminate spinel (MgAl 2 O 4 spinel) because of its high mechanical strength good optical properties and beinglighter than metal (Goldstein et al. 2008). MgAl 2 O 4 spinel has excellent optical properties with useful transmission from about 0.2 nm in the UV through the visible range to
Get Price(PDF) Post mortem study of alumina-spinel castables of an
When Al 2 O 3 contains spinel the strength after firing at 1500ºC largely increase 1 . Two refractory materials are used in the roof alumina-spinel in the critical region and high alumina in the other parts. The following report deals with the alumina- spinel only. In table 1 the chemical composition of the alumina-spinel castable is given.
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IMPACT OF DISPERSANTS ON THE MECHANICAL STRENGTH
The effect of four commercial dispersants on the properties of alumina-spinel self-flowing refractory castables was investigated. The self-flow value water demand physical and mechanical properties as well as microstructure of these castables were evaluated. The results showed that the polycarboxylate ether is the most effective dispersant in increasing self-flowability because of its
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EFFECT OF SPINEL ADDITION ON THE SINTERING
· steel ladles. This is due to the fact that the dense alumina-magnesia spinel has adequate hot strength high corro-sion resistance to both acidic and basic slags and also good erosion resistance at elevated temperatures 1-3 . Investigation of Al2O3 and MgO·Al2O3 composites should start with the phase equilibrium diagram 4 .
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Rare-Earth Oxide-Doped Magnesium Aluminate Spinelan
· The effect of different additives such as SnO 2 TiO 2 Cr 2 O 3 LiF ZnO and CaF 2 on the formation and densification of spinel have already been well explored 9 11 27−33 . TiO 2 was found to improve the densification of MgAl 2 O 4 spinel with a minimum effect on spinellization 30 31 .
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Effect of Spinel Content on the Reaction of Porous
Effect of Particle Size Distribution of Raw Materials on Properties of Magnesia-Alumina Refractory p.595. Preparation and Properties of Lightweight High-Strength Insulation Materials Using Fly Ash Floating Beads and the effect of the spinel content on the reaction between porous periclase-spinel ceramics and cement clinker was
Get PriceEffect of Spinel Content on the Reaction of Porous
Effect of Particle Size Distribution of Raw Materials on Properties of Magnesia-Alumina Refractory p.595. Preparation and Properties of Lightweight High-Strength Insulation Materials Using Fly Ash Floating Beads and the effect of the spinel content on the reaction between porous periclase-spinel ceramics and cement clinker was
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Porogenesis in the Alumina-Brucite-Magnesia-Spinel System
· The raw materials were combined in a 1 1 Al 2 O 3 MgO molar ratio to produce stoichiometric spinel (Equation 2).Whereas the single source of Al 2 O 3 were thin calcined alumina particles (α-Al 2 O 3 A1000SG Almatis USA Figure 1a) the full content of MgO was achieved by blending magnesium hydroxide (Mg(OH) 2) and magnesium oxide (MgO) in five different proportions (0 25 50 75 and 100
Get Price(PDF) Microstructure and phase evolution of alumina–spinel
Oxide (wt. ) Tabular alumina Spinel Reactive alumina Cement The effect of nano-alumina content on the A.P. of the Al2O3 99.4 76 99.8 72.7 alumina–spinel refractory castable as a function of sintering Na2O 0.33 0.15 0.06 0.19 temperature is shown in Fig. 1.
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Preparation of Alumina-Magnesia Spinel Based High
· The objects of investigation are foam ceramic materials based on aluminum oxide magnesium oxide and alumina-magnesia spinel. The results of investigations on the sintering of spinel ceramic using aluminum and magnesium oxides as the initial components are presented. It is shown that the optimal range of the sintering temperatures for obtaining materials with open-cellular pore
Get PriceEffect of spinel content on slag attack resistance of high
· Effect of spinel content on hot strength of alumina-spinel castables in the temperature range 1000–1500 °C
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IMPACT OF DISPERSANTS ON THE MECHANICAL STRENGTH
The effect of four commercial dispersants on the properties of alumina-spinel self-flowing refractory castables was investigated. The self-flow value water demand physical and mechanical properties as well as microstructure of these castables were evaluated. The results showed that the polycarboxylate ether is the most effective dispersant in increasing self-flowability because of its
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Effect of spinel content on slag attack resistance of high
Abstract 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
Get PriceInfluence of Spinel on the Fracture Energy of Refractory
The specific fracture energy of alumina-spinel refractory castables was studied by the wedge-splitting method in this paper. The influence of synthetic spinel on the specific fracture energy of aluminamagnesia refractory castables was investigated. In-situ formation spinel was replaced by sintering spinel as the synthetic spinel. The experimental results indicated that the specific fracture
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Effect of spinel content on the properties of magnesia
· Increase in spinel content from 20 to 30 wt. results in a lowering in the hot strength but the strength is much superior than the no spinel containing A batch. Effect of microcraking and tensile hoop stress around the spinel grains is the reason for this improvement in hot strength valiues.
Get PricePreparation of Alumina-Magnesia Spinel Based High
· The objects of investigation are foam ceramic materials based on aluminum oxide magnesium oxide and alumina-magnesia spinel. The results of investigations on the sintering of spinel ceramic using aluminum and magnesium oxides as the initial components are presented. It is shown that the optimal range of the sintering temperatures for obtaining materials with open-cellular pore
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Optimization of Properties for Alumina-Spinel Refractory
· Aiming at optimizing properties of alumina-spinel refractory castables coarse corundum particles were replaced partially with the particles of a novel porous multi-component CMA (CaO-MgO-Al 2 O 3) aggregate in the same size.Properties including the bulk density apparent porosity strength slag corrosion resistance thermal shock resistance and thermal fatigue resistance of alumina-spinel
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Effect of Spinel Kinds on Properties of Alumina—Spinel
· There have been numerous studies on the effect of spinel on refractory castables properties including the influence of spinel grain size chemical composition density spalling resistance slag attack resistance and hot strength. Alumina–spinel castables have also been developed with in situ spinel‐forming material where fine MgO powder
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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 were found for in situ spinel-forming compositions
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Effect of spinel content on hot strength of alumina-spinel
Hot modulus of rupture of Al 2 O 3 -spinel castables containing 5–15 wt alumina-rich magnesia alumina spinel and 1·7 wt CaO generally increases with increase in spinel content and temperature from 1000 to 1500°C. The magnitudes of hot modulus of rupture of castables containing 15 wt spinel and 1·7 wt CaO are 14·3 MPa at 1400°C and 15·6 MPa at
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Effect of Additives on the Expansion Behavior of Alumina
Alumina–spinel castables were prepared using tabular alumina and coarse spinel as aggregates calcium aluminate cement fused alumina fines spinel fines and ultrafine alumina as matrixes. Effect of microsilica and dispersant on the properties of alumina–spinel castables were investigated in this paper. The results show that with the same content of microsilica addition the values of
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