Effect of Vanadium-Bearing Slag Aggregates on the Microstructure and Thermo-Mechanical Properties of Alumina Refractory Castables.
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| Title: | Effect of Vanadium-Bearing Slag Aggregates on the Microstructure and Thermo-Mechanical Properties of Alumina Refractory Castables. |
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| Authors: | Derensy, Mathilda1 (AUTHOR) derensy@ghi.rwth-aachen.de, Tonnesen, Thorsten1 (AUTHOR) |
| Source: | Materials (1996-1944). Mar2026, Vol. 19 Issue 5, p983. 23p. |
| Subjects: | Microstructure, Refractory materials, Calcium aluminate, Mineral aggregates, Thermomechanical properties of metals, Corrosion resistance |
| Abstract: | The incorporation of recycled metallurgical slags into refractory materials constitutes a promising approach to enhancing sustainability in the refractory industry. This study investigates the effect of vanadium-bearing slag aggregates as partial replacements for tabular alumina in castables and compares their behaviour with high-alumina and bauxite-based castables. Two vanadium-bearing slags with different mineralogical compositions were introduced in the 1–3 mm aggregate fraction with substitution up to 25 wt.%. Their effects on microstructure, thermo-mechanical performance, and corrosion resistance were evaluated. The introduction of vanadium-bearing slag significantly alters the microstructure of the castables, affecting their performance. Both slags displayed grains with higher porosity, microcracking, and heterogeneity compared with tabular alumina, but showed similarities to bauxite grains. Slag 1, enriched in calcium aluminate phases, provides limited mechanical strength but improved corrosion resistance due to improved bonding with the matrix. Slag 2, containing a higher spinel content, enhances mechanical strength, showing behaviour comparable with bauxite-based castables, particularly at 10 wt.% replacement. Vanadium is mainly present in metallic form and as Mg(Al,V)2O4 spinels in both slags. Upon firing, vanadium migrates toward the grain boundaries and reacts with the surrounding calcium aluminate phases to be incorporated in Ca(Al,V)2O4 and Ca(Al,V)4O7, while the spinel phase remains stable. [ABSTRACT FROM AUTHOR] |
| Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 192640255 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Effect of Vanadium-Bearing Slag Aggregates on the Microstructure and Thermo-Mechanical Properties of Alumina Refractory Castables. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Derensy%2C+Mathilda%22">Derensy, Mathilda</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> derensy@ghi.rwth-aachen.de</i><br /><searchLink fieldCode="AR" term="%22Tonnesen%2C+Thorsten%22">Tonnesen, Thorsten</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Mar2026, Vol. 19 Issue 5, p983. 23p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Refractory+materials%22">Refractory materials</searchLink><br /><searchLink fieldCode="DE" term="%22Calcium+aluminate%22">Calcium aluminate</searchLink><br /><searchLink fieldCode="DE" term="%22Mineral+aggregates%22">Mineral aggregates</searchLink><br /><searchLink fieldCode="DE" term="%22Thermomechanical+properties+of+metals%22">Thermomechanical properties of metals</searchLink><br /><searchLink fieldCode="DE" term="%22Corrosion+resistance%22">Corrosion resistance</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The incorporation of recycled metallurgical slags into refractory materials constitutes a promising approach to enhancing sustainability in the refractory industry. This study investigates the effect of vanadium-bearing slag aggregates as partial replacements for tabular alumina in castables and compares their behaviour with high-alumina and bauxite-based castables. Two vanadium-bearing slags with different mineralogical compositions were introduced in the 1–3 mm aggregate fraction with substitution up to 25 wt.%. Their effects on microstructure, thermo-mechanical performance, and corrosion resistance were evaluated. The introduction of vanadium-bearing slag significantly alters the microstructure of the castables, affecting their performance. Both slags displayed grains with higher porosity, microcracking, and heterogeneity compared with tabular alumina, but showed similarities to bauxite grains. Slag 1, enriched in calcium aluminate phases, provides limited mechanical strength but improved corrosion resistance due to improved bonding with the matrix. Slag 2, containing a higher spinel content, enhances mechanical strength, showing behaviour comparable with bauxite-based castables, particularly at 10 wt.% replacement. Vanadium is mainly present in metallic form and as Mg(Al,V)2O4 spinels in both slags. Upon firing, vanadium migrates toward the grain boundaries and reacts with the surrounding calcium aluminate phases to be incorporated in Ca(Al,V)2O4 and Ca(Al,V)4O7, while the spinel phase remains stable. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/ma19050983 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 23 StartPage: 983 Subjects: – SubjectFull: Microstructure Type: general – SubjectFull: Refractory materials Type: general – SubjectFull: Calcium aluminate Type: general – SubjectFull: Mineral aggregates Type: general – SubjectFull: Thermomechanical properties of metals Type: general – SubjectFull: Corrosion resistance Type: general Titles: – TitleFull: Effect of Vanadium-Bearing Slag Aggregates on the Microstructure and Thermo-Mechanical Properties of Alumina Refractory Castables. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Derensy, Mathilda – PersonEntity: Name: NameFull: Tonnesen, Thorsten IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 03 Text: Mar2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 19961944 Numbering: – Type: volume Value: 19 – Type: issue Value: 5 Titles: – TitleFull: Materials (1996-1944) Type: main |
| ResultId | 1 |
