A new technological approach to the granulation of slag melts of ferrous metallurgy: obtaining glassy fine-grained granules of improved quality
Abstract The technological factors required to improve the operational properties of granulated metallurgical slags demanded in the building industry have been analyzed. In order to satisfy these factors, a new technology for hydro-vacuum granulation of slag melts (HVG) has been developed. It is sho...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-11-01
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| Series: | Journal of Engineering and Applied Science |
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| Online Access: | https://doi.org/10.1186/s44147-021-00019-7 |
| _version_ | 1818402919154712576 |
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| author | David Sakhvadze Gigo Jandieri Giorgi Jangveladze Giorgi Sakhvadze |
| author_facet | David Sakhvadze Gigo Jandieri Giorgi Jangveladze Giorgi Sakhvadze |
| author_sort | David Sakhvadze |
| collection | DOAJ |
| description | Abstract The technological factors required to improve the operational properties of granulated metallurgical slags demanded in the building industry have been analyzed. In order to satisfy these factors, a new technology for hydro-vacuum granulation of slag melts (HVG) has been developed. It is shown that the main advantage of the proposed HVG process is the provision of forced high-speed vortex convection of water, with the effect of vertical suction, crushing, and degassing of the three-phase (water–slag granules–water vapor) heterogeneous medium formed during the overcooling and solidification of slag. It is proved that the high-speed volumetric disintegration and overcooling with the degassing effect sharply reduces a degree of aggressive gas/vapor impact on the being cooled particles of slag, which, in turn, leads to the reduction of the perforation degree of the granules. The obtained granules are distinguished by stable fractionation and improved, well-defined dense amorphous glassy structure, the water-holding capacity of which has reduced from 45–50% to 25–13%, the actual moisture content from 24–20% to 6–4%, while the hydraulic activity in terms of CaO-uptake increased from the conventional 320–360 mg/g to 610–650 mg/g. Pilot scale research demonstrated that the designed equipment for the HVG technology allows sustainable control of the quality of granules, and it has the potential for further development and implementation. |
| first_indexed | 2024-12-14T08:16:00Z |
| format | Article |
| id | doaj.art-539bfff91e1e464cb488d9f4ec0fc5af |
| institution | Directory Open Access Journal |
| issn | 1110-1903 2536-9512 |
| language | English |
| last_indexed | 2024-12-14T08:16:00Z |
| publishDate | 2021-11-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of Engineering and Applied Science |
| spelling | doaj.art-539bfff91e1e464cb488d9f4ec0fc5af2022-12-21T23:09:55ZengSpringerOpenJournal of Engineering and Applied Science1110-19032536-95122021-11-0168111710.1186/s44147-021-00019-7A new technological approach to the granulation of slag melts of ferrous metallurgy: obtaining glassy fine-grained granules of improved qualityDavid Sakhvadze0Gigo Jandieri1Giorgi Jangveladze2Giorgi Sakhvadze3Georgian Technical UniversityMetallurgical Engineering and Consulting Ltd.Аkkord CementG-Metal Ltd.Abstract The technological factors required to improve the operational properties of granulated metallurgical slags demanded in the building industry have been analyzed. In order to satisfy these factors, a new technology for hydro-vacuum granulation of slag melts (HVG) has been developed. It is shown that the main advantage of the proposed HVG process is the provision of forced high-speed vortex convection of water, with the effect of vertical suction, crushing, and degassing of the three-phase (water–slag granules–water vapor) heterogeneous medium formed during the overcooling and solidification of slag. It is proved that the high-speed volumetric disintegration and overcooling with the degassing effect sharply reduces a degree of aggressive gas/vapor impact on the being cooled particles of slag, which, in turn, leads to the reduction of the perforation degree of the granules. The obtained granules are distinguished by stable fractionation and improved, well-defined dense amorphous glassy structure, the water-holding capacity of which has reduced from 45–50% to 25–13%, the actual moisture content from 24–20% to 6–4%, while the hydraulic activity in terms of CaO-uptake increased from the conventional 320–360 mg/g to 610–650 mg/g. Pilot scale research demonstrated that the designed equipment for the HVG technology allows sustainable control of the quality of granules, and it has the potential for further development and implementation.https://doi.org/10.1186/s44147-021-00019-7Slag meltHydro-vacuum granulationOvercoolingDegassingAmorphizationExtraction of metal and graphite inclusions |
| spellingShingle | David Sakhvadze Gigo Jandieri Giorgi Jangveladze Giorgi Sakhvadze A new technological approach to the granulation of slag melts of ferrous metallurgy: obtaining glassy fine-grained granules of improved quality Journal of Engineering and Applied Science Slag melt Hydro-vacuum granulation Overcooling Degassing Amorphization Extraction of metal and graphite inclusions |
| title | A new technological approach to the granulation of slag melts of ferrous metallurgy: obtaining glassy fine-grained granules of improved quality |
| title_full | A new technological approach to the granulation of slag melts of ferrous metallurgy: obtaining glassy fine-grained granules of improved quality |
| title_fullStr | A new technological approach to the granulation of slag melts of ferrous metallurgy: obtaining glassy fine-grained granules of improved quality |
| title_full_unstemmed | A new technological approach to the granulation of slag melts of ferrous metallurgy: obtaining glassy fine-grained granules of improved quality |
| title_short | A new technological approach to the granulation of slag melts of ferrous metallurgy: obtaining glassy fine-grained granules of improved quality |
| title_sort | new technological approach to the granulation of slag melts of ferrous metallurgy obtaining glassy fine grained granules of improved quality |
| topic | Slag melt Hydro-vacuum granulation Overcooling Degassing Amorphization Extraction of metal and graphite inclusions |
| url | https://doi.org/10.1186/s44147-021-00019-7 |
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