Evaluation of ceramic refractories for slagging gasifiers
· A dense fused-cast chrome-spinel refractory has demonstrated superior resistance to corrosion by a wide variety of coal slags (CaO/SiO/sub 2/ = 0.21.7). Refractories containing > 30 chromia reacted with all types of slags to form complex spinel-reaction products.
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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-Al2O3) 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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Study of dynamic refractory wear by slags containing very
· RESEARCH ARTICLE Study of dynamic refractory wear by slags containing very high FeO contents under steelmaking conditions Jonas L. Svantesson a Björn Glasera Mikael Ersson a Jesse F. Whitea Matej Imrisb and Pär G. Jönsson a aKTH Royal Institute of Technology Department of Materials Science and Engineering Stockholm Sweden bScanArc Plasma Technologies AB
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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-Al2O3) 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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Review Formation Evolution and Removal of MgO·Al2O3
Additionally to help the control of spinel inclusions thermodynamic evaluation on the formation and evolution of spinel inclusions was also conducted by Itoh22 35) et al. and other researchers. In 2015 Zhang 36) discussed et al. the accuracy of thermodynamic calculation using different methods. In 2019 some of the equilibrium constants used
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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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Slag attack evaluation of in situ spinel-containing
· Thus this work addresses the slag attack evaluation of four designed in situ spinel-containing castables (containing hydratable alumina or calcium aluminate cement as a binder source and 0 or 1 wt of silica fume) when in contact with a Fe x O rich industrial slag. Corrosion cup-tests microstructural characterization and a two-step thermodynamic simulation model were used in order to investigate the reactions taking place during the slag–refractory
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Spinel In situ versus PreformedClearing the Myth
· Thermodynamic stability † stability of refractory oxides against reduc- aluminate spinel is a highly refractory mater-ial with a melting point of 2135 °C. A strong vantage of spinel containing mixes for resist-ance to steelmaking slag 8 .
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CA6 impact on the corrosion behavior of cement-bonded
· In order to answer these questions this work focused on thermodynamic simulations of the corrosion resistance of the four cement-bonded spinel-containing refractory castables reported by Sako et al. . Additional data were also attained by the re-evaluation of the corroded samples׳ microstructure.
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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
Get PriceThe effective modification of spinel inclusions by Ca
· The Mechanisms of Spinel Formation in Liquid Steel In previous research it has been proposed that spinels are formed from the interaction between low-oxygen steel and MgO-containing refractories 9–11 arc-heat-ing on slags at a ladle furnace 12 as well as from alloys containing Mg. The typical Mg values in Al-containing materials are
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"Evaluation of spinel refractory interactions with steel
Eight refractory linings one pure magnesia three magnesia-based spinel-forming and four alumina-based spinel-containing dry vibratable mixes were tested by melting and holding a low-carbon low-manganese steel in an induction furnace lined with each mix for four hours at 1600°C.
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Critical Evaluation and Thermodynamic Optimization of the
· A complete literature review critical evaluation and thermodynamic optimization of experimental phase diagrams and thermodynamic properties of the Na2O-FeO-Fe2O3 system were performed at 1 bar total pressure. A set of optimized model parameters obtained for all phases present in this system reproduces available and reliable thermodynamic properties and phase equilibria within
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Review Formation Evolution and Removal of MgO·Al2O3
Additionally to help the control of spinel inclusions thermodynamic evaluation on the formation and evolution of spinel inclusions was also conducted by Itoh22 35) et al. and other researchers. In 2015 Zhang 36) discussed et al. the accuracy of thermodynamic calculation using different methods. In 2019 some of the equilibrium constants used
Get PriceCritical Evaluation and Thermodynamic Optimization of the
· The thermodynamic and phase diagram data of the Li 2 O-Al 2 O 3 and Li 2 O-MgO-Al 2 O 3 systems were critically evaluated and optimized to obtain a set of consistent Gibbs energy functions for all phases in the systems. The LiAl 5 O 8-MgAl 2 O 4 spinel solid solution was modeled with the two-sublattice compound energy formalism by considering the cation distribution between the tetrahedral
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Review Formation Evolution and Removal of MgO·Al2O3
Additionally to help the control of spinel inclusions thermodynamic evaluation on the formation and evolution of spinel inclusions was also conducted by Itoh22 35) et al. and other researchers. In 2015 Zhang 36) discussed et al. the accuracy of thermodynamic calculation using different methods. In 2019 some of the equilibrium constants used
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Formation of refractory inclusions by evaporation of
· 2.1.2. Thermodynamic Data for Silicate Liquids A model for the thermodynamic properties of silicate liquids having the compositions of refractory inclusions is needed to calculate both their liquid-crystal equilibrium assemblages and their vapor pressures. In this work as in Grossman et al. (2000) the 1.0 to 1.5 wt. TiO2 present in
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Thermodynamic evaluation and properties of refractory
Abstract The influence of iron oxide in the phase relationships of Al 2 O 3 -MgO-CaO and Al 2 O 3 -MgO purging plug refractory material has been studied by the thermodynamic analysis tool FactSage. Results showed that the system without CaO to be advantageous on the onset temperature of liquid phase and on the liquid content at defined chemical composition and temperature.
Get PriceThermodynamic evaluation and properties of refractory
Abstract The influence of iron oxide in the phase relationships of Al 2 O 3 -MgO-CaO and Al 2 O 3 -MgO purging plug refractory material has been studied by the thermodynamic analysis tool FactSage. Results showed that the system without CaO to be advantageous on the onset temperature of liquid phase and on the liquid content at defined chemical composition and temperature.
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Study of dynamic refractory wear by slags containing very
· RESEARCH ARTICLE Study of dynamic refractory wear by slags containing very high FeO contents under steelmaking conditions Jonas L. Svantesson a Björn Glasera Mikael Ersson a Jesse F. Whitea Matej Imrisb and Pär G. Jönsson a aKTH Royal Institute of Technology Department of Materials Science and Engineering Stockholm Sweden bScanArc Plasma Technologies AB
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Optimization of Properties for Alumina-Spinel Refractory
· Luz A.P. Martinez A.G.T. Braulio M.A.L. Pandolfelli V.C. Thermodynamic evaluation of spinel containing refractory castables corrosion by secondary metallurgy slag. Ceram. Int. 2011 37 1191–1201. doi 10.1016/j.ceramint.2010.11.043. Google Scholar
Get PriceInfluence 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
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"Evaluation of spinel refractory interactions with steel
Eight refractory linings one pure magnesia three magnesia-based spinel-forming and four alumina-based spinel-containing dry vibratable mixes were tested by melting and holding a low-carbon low-manganese steel in an induction furnace lined with each mix for four hours at 1600°C.
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"Evaluation of spinel refractory interactions with steel
Eight refractory linings one pure magnesia three magnesia-based spinel-forming and four alumina-based spinel-containing dry vibratable mixes were tested by melting and holding a low-carbon low-manganese steel in an induction furnace lined with each mix for four hours at 1600°C.
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Thermodynamic Modeling and Experimental Investigation
· To validate the thermodynamic simulation results t hree commercial refractories were selected from a list of available products for evaluation based on refractory composition (Table 2). Specifically the composition was selected to evaluate the effect of replacing SiO 2 by CaO to increase the corrosion resi stance of refractory materials.
Get PriceThermodynamic evaluation of spinel containing refractory
· This work addresses the thermodynamic evaluation of different spinel-containing refractory castable compositions in contact with a basic steel ladle slag (CaO/SiO 2 ∼ 9). The main differences among the castable compositions were the amount of silica fume (0 or 1 wt ) the binder source (calcium aluminate cement or hydratable alumina) and the spinel incorporation route ( in situ or pre-formed).
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Improvement in Slag Resistance of No-Cement Refractory
The corrosion resistance of spinel containing cement bonded castables has been extensively investigated in the past. However corrosion of no-cement refractory castables (NCC) has not been widely studied since the use of NCC has been relatively limited up till now. This paper focuses on the slag resistance of NCCs and the often-used spinel containing low cement castable (LCC) is used as the
Get PriceFormation of refractory inclusions by evaporation of
· 2.1.2. Thermodynamic Data for Silicate Liquids A model for the thermodynamic properties of silicate liquids having the compositions of refractory inclusions is needed to calculate both their liquid-crystal equilibrium assemblages and their vapor pressures. In this work as in Grossman et al. (2000) the 1.0 to 1.5 wt. TiO2 present in
Get PriceSpinel In situ versus PreformedClearing the Myth
· Thermodynamic stability † stability of refractory oxides against reduc- aluminate spinel is a highly refractory mater-ial with a melting point of 2135 °C. A strong vantage of spinel containing mixes for resist-ance to steelmaking slag 8 .
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