thermodynamic evaluation of spinel containing refractory
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
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.
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 .
In‐Depth Microstructural Evolution Analyses of Cement
· Considering the lack of conclusive studies on this subject in the refractories field the present study addresses an in-depth microstructural evolution analysis of high-alumina castables containing in situ or preformed spinel (MgAl 2 O 4) in order to check the actual CA 6 development steps in the presence of an MgO-containing phase.
Thermodynamic 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/SiO2 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
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
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
Critical 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
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
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
Magnesium Aluminate Spinel Raw Materials for High
· Magnesium aluminate spinel is a highly refractory material with a melting point of 2135 o C. Table 1 shows a comparison of the density thermal expansion coefficient and thermal conductivity of the end-members (MgO Al 2 O 3 ) compared to the spinel phase.
Magnesium Aluminate Spinel Raw Materials for High
· Magnesium aluminate spinel is a highly refractory material with a melting point of 2135 o C. Table 1 shows a comparison of the density thermal expansion coefficient and thermal conductivity of the end-members (MgO Al 2 O 3 ) compared to the spinel phase.
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 .
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
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
Effect of spinel content on slag attack resistance of high
Effect of spinel content on slag attack resistance of high alumina refractory castables. 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
Evaluation of Refractories for Aluminum Recycling Furnaces
Evaluation of Refractories for Aluminum Recycling Furnaces By E. G. Davis t reated and spinel mortar coat ed 70-pct-AI203 refractory. . .. . . . . 8 8. Samples and cross sect i ons of samples showing untreated phosphoric acid u cts containing oils coatings oxide
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 .
ColloquiumICR 2020
High temperature damping characteristic of spinel containing materials. view presentation. Leber T Creep parameter determination of a shaped alumina spinel refractory using statistical analysis. view presentation University of Limoges France and Pyrotek Canada. Nr. 25 Evaluation of heat conduction through insulating refractory bricks
Thermodynamic Stability of Spinel Phase at the Interface
· The interfacial reaction between alumina refractory and CaO–CaF 2 –SiO 2 –Al 2 O 3 –MgO–MnO slag was observed at 1873 K to estimate the stability of the spinel phase using computational thermodynamics under refining conditions of Mn-containing steels. The concentration of MnO formed by the slag–steel reaction in the CaO–CaF 2 –SiO 2 –Al 2 O 3 –MgO melts generally
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
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.
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
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
Cited by 25
Evaluation of Refractories for Aluminum Recycling Furnaces
Evaluation of Refractories for Aluminum Recycling Furnaces By E. G. Davis t reated and spinel mortar coat ed 70-pct-AI203 refractory. . .. . . . . 8 8. Samples and cross sect i ons of samples showing untreated phosphoric acid u cts containing oils coatings oxide
"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.
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
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.
Al2O3-based binders for corrosion resistance optimization
· This work addresses the main aspects related to the use of alternative binders hydratable (HA) or colloidal alumina (ColAlu) in castables containing different spinel sources (pre-formed or in situ generated) in order to point out (i) the features that control the corrosion behavior of these materials and (ii) the key factors to better select a refractory composition. Thermodynamic calculations corrosion cup-test and SEM analyses were carried out in order to evaluate
Cited by 14
Critical 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
Thermodynamic Stability of Spinel Phase at the Interface
· The interfacial reaction between alumina refractory and CaO–CaF 2 –SiO 2 –Al 2 O 3 –MgO–MnO slag was observed at 1873 K to estimate the stability of the spinel phase using computational thermodynamics under refining conditions of Mn-containing steels. The concentration of MnO formed by the slag–steel reaction in the CaO–CaF 2 –SiO 2 –Al 2 O 3 –MgO melts generally
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
In‐Depth Microstructural Evolution Analyses of Cement
· Considering the lack of conclusive studies on this subject in the refractories field the present study addresses an in-depth microstructural evolution analysis of high-alumina castables containing in situ or preformed spinel (MgAl 2 O 4) in order to check the actual CA 6 development steps in the presence of an MgO-containing phase.
