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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Autores principales:	David Sakhvadze, Gigo Jandieri, Giorgi Jangveladze, Giorgi Sakhvadze
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Slag melt Hydro-vacuum granulation Overcooling Degassing Amorphization Extraction of metal and graphite inclusions Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/539bfff91e1e464cb488d9f4ec0fc5af
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spelling	oai:doaj.org-article:539bfff91e1e464cb488d9f4ec0fc5af2021-11-14T12:16:23ZA new technological approach to the granulation of slag melts of ferrous metallurgy: obtaining glassy fine-grained granules of improved quality10.1186/s44147-021-00019-71110-19032536-9512https://doaj.org/article/539bfff91e1e464cb488d9f4ec0fc5af2021-11-01T00:00:00Zhttps://doi.org/10.1186/s44147-021-00019-7https://doaj.org/toc/1110-1903https://doaj.org/toc/2536-9512Abstract 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.David SakhvadzeGigo JandieriGiorgi JangveladzeGiorgi SakhvadzeSpringerOpenarticleSlag meltHydro-vacuum granulationOvercoolingDegassingAmorphizationExtraction of metal and graphite inclusionsEngineering (General). Civil engineering (General)TA1-2040ENJournal of Engineering and Applied Science, Vol 68, Iss 1, Pp 1-17 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Slag melt Hydro-vacuum granulation Overcooling Degassing Amorphization Extraction of metal and graphite inclusions Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Slag melt Hydro-vacuum granulation Overcooling Degassing Amorphization Extraction of metal and graphite inclusions Engineering (General). Civil engineering (General) TA1-2040 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
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.
format	article
author	David Sakhvadze Gigo Jandieri Giorgi Jangveladze Giorgi Sakhvadze
author_facet	David Sakhvadze Gigo Jandieri Giorgi Jangveladze Giorgi Sakhvadze
author_sort	David Sakhvadze
title	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_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_sort	new technological approach to the granulation of slag melts of ferrous metallurgy: obtaining glassy fine-grained granules of improved quality
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/539bfff91e1e464cb488d9f4ec0fc5af
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A new technological approach to the granulation of slag melts of ferrous metallurgy: obtaining glassy fine-grained granules of improved quality

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