New approach of recycling vanadium‐bearing slags as a binder in high‐alumina refractory castables application
Abstract Handling the massive quantities of by‐products from metallurgical processes has become a major concern in recent decades. Efforts to develop sustainable alternatives for these secondary resources are ongoing to achieve the transition to climate neutrality. This study has investigated the po...
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| Format: | Article |
| Language: | English |
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Wiley
2025-01-01
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| Series: | International Journal of Ceramic Engineering & Science |
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| Online Access: | https://doi.org/10.1002/ces2.10242 |
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| author | Mathilda Derensy Thomas Zanin Jan‐Felix Bleck Thorsten Tonnesen Jesus Gonzalez‐Julian |
| author_facet | Mathilda Derensy Thomas Zanin Jan‐Felix Bleck Thorsten Tonnesen Jesus Gonzalez‐Julian |
| author_sort | Mathilda Derensy |
| collection | DOAJ |
| description | Abstract Handling the massive quantities of by‐products from metallurgical processes has become a major concern in recent decades. Efforts to develop sustainable alternatives for these secondary resources are ongoing to achieve the transition to climate neutrality. This study has investigated the potential of employing vanadium‐bearing slag as a new value‐added binder in refractories, aiming to replace virgin raw materials. Two types of vanadium‐bearing slags from BOF, each containing <2 wt.% vanadium were studied. Low‐cement vanadium slag‐based castables were prepared by gradually substituting 0, 2.5, and 5 wt.% of the commercial calcium aluminate cements (Secar71 and CMA72) by the slags. The flow values of the mixes containing 5 wt.% of slag decrease significantly from about 90% to 30% after 30 min, showing poor ability to flow and thus are not considered as self‐flow castables. Castables containing 2.5 wt.% of slag present a cold crushing strength value, in the range of 71–116 MPa while values for castables containing 5 wt.% of slag fall into the range of 53–68 MPa due to the lower packing properties leading to higher porosity and reduce in strength. Similar observation was concluded for cold modulus of rupture. The micrographs of the samples containing both slag and cement show promising compatibility between the binder and aggregates after sintering at 1500°C. Overall, characteristics obtained with the samples containing slag show promising alternatives as a refractory lining. |
| format | Article |
| id | doaj-art-306996cb667c47e8b1f9fda6c2da55f8 |
| institution | Kabale University |
| issn | 2578-3270 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Ceramic Engineering & Science |
| spelling | doaj-art-306996cb667c47e8b1f9fda6c2da55f82025-01-21T08:44:30ZengWileyInternational Journal of Ceramic Engineering & Science2578-32702025-01-0171n/an/a10.1002/ces2.10242New approach of recycling vanadium‐bearing slags as a binder in high‐alumina refractory castables applicationMathilda Derensy0Thomas Zanin1Jan‐Felix Bleck2Thorsten Tonnesen3Jesus Gonzalez‐Julian4Institute of Mineral Engineering Chair of Ceramics RWTH Aachen University Aachen GermanyInstitute of Mineral Engineering Chair of Ceramics RWTH Aachen University Aachen GermanyInstitute of Mineral Engineering Chair of Ceramics RWTH Aachen University Aachen GermanyInstitute of Mineral Engineering Chair of Ceramics RWTH Aachen University Aachen GermanyInstitute of Mineral Engineering Chair of Ceramics RWTH Aachen University Aachen GermanyAbstract Handling the massive quantities of by‐products from metallurgical processes has become a major concern in recent decades. Efforts to develop sustainable alternatives for these secondary resources are ongoing to achieve the transition to climate neutrality. This study has investigated the potential of employing vanadium‐bearing slag as a new value‐added binder in refractories, aiming to replace virgin raw materials. Two types of vanadium‐bearing slags from BOF, each containing <2 wt.% vanadium were studied. Low‐cement vanadium slag‐based castables were prepared by gradually substituting 0, 2.5, and 5 wt.% of the commercial calcium aluminate cements (Secar71 and CMA72) by the slags. The flow values of the mixes containing 5 wt.% of slag decrease significantly from about 90% to 30% after 30 min, showing poor ability to flow and thus are not considered as self‐flow castables. Castables containing 2.5 wt.% of slag present a cold crushing strength value, in the range of 71–116 MPa while values for castables containing 5 wt.% of slag fall into the range of 53–68 MPa due to the lower packing properties leading to higher porosity and reduce in strength. Similar observation was concluded for cold modulus of rupture. The micrographs of the samples containing both slag and cement show promising compatibility between the binder and aggregates after sintering at 1500°C. Overall, characteristics obtained with the samples containing slag show promising alternatives as a refractory lining.https://doi.org/10.1002/ces2.10242aluminacalcium aluminaterefractoriesspinelsvanadium/vanadium compounds |
| spellingShingle | Mathilda Derensy Thomas Zanin Jan‐Felix Bleck Thorsten Tonnesen Jesus Gonzalez‐Julian New approach of recycling vanadium‐bearing slags as a binder in high‐alumina refractory castables application International Journal of Ceramic Engineering & Science alumina calcium aluminate refractories spinels vanadium/vanadium compounds |
| title | New approach of recycling vanadium‐bearing slags as a binder in high‐alumina refractory castables application |
| title_full | New approach of recycling vanadium‐bearing slags as a binder in high‐alumina refractory castables application |
| title_fullStr | New approach of recycling vanadium‐bearing slags as a binder in high‐alumina refractory castables application |
| title_full_unstemmed | New approach of recycling vanadium‐bearing slags as a binder in high‐alumina refractory castables application |
| title_short | New approach of recycling vanadium‐bearing slags as a binder in high‐alumina refractory castables application |
| title_sort | new approach of recycling vanadium bearing slags as a binder in high alumina refractory castables application |
| topic | alumina calcium aluminate refractories spinels vanadium/vanadium compounds |
| url | https://doi.org/10.1002/ces2.10242 |
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