Influence of slag composition and oxygen potential on thermodynamic behavior of vanadium in FeO-TiO2-MgO-SiO2-Al2O3 smelting slag and molten iron

The influence of slag composition of FeO/TiO2 (=F/T) ratio, Al2O3/(SiO2+Al2O3) (=A/(S+A)) ratio and oxygen partial pressure (pO2=10−10to10−9atm) on the thermodynamic behavior of vanadium oxide in molten ilmenite smelting slag, i.e., FetO-TiO2-MgO-Al2O3-SiO2 system, was investigated at 1550 °C. The d...

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Autores principales:	Jungho Heo, Yumin Lee, Hyunsik Park, Joo Hyun Park
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Vanadium oxide Ilmenite smelting slag Vanadium distribution ratio Valence of vanadium ions Redox equilibria Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/78c1e5aa0d8449c49e3159a303cccc06
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spelling	oai:doaj.org-article:78c1e5aa0d8449c49e3159a303cccc062021-11-24T04:31:24ZInfluence of slag composition and oxygen potential on thermodynamic behavior of vanadium in FeO-TiO2-MgO-SiO2-Al2O3 smelting slag and molten iron2238-785410.1016/j.jmrt.2021.11.035https://doaj.org/article/78c1e5aa0d8449c49e3159a303cccc062021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2238785421013144https://doaj.org/toc/2238-7854The influence of slag composition of FeO/TiO2 (=F/T) ratio, Al2O3/(SiO2+Al2O3) (=A/(S+A)) ratio and oxygen partial pressure (pO2=10−10to10−9atm) on the thermodynamic behavior of vanadium oxide in molten ilmenite smelting slag, i.e., FetO-TiO2-MgO-Al2O3-SiO2 system, was investigated at 1550 °C. The distribution ratio of vanadium (=LV) between molten iron and FetO-TiO2-MgO-Al2O3-SiO2 slag increases with increasing F/T ratio, while it decreases with increasing A/(S+A) ratio. In addition, logLV generally increases with increasing theoretical optical basicity of the slag (=Λslag). Vanadium oxide (VOx) is expected to behave as an acidic component in the present system. Vanadium in ilmenite smelting slags primarily consist of V3+, V4+, and V5+ ions, as determined by Gaussian deconvolution of X-ray photoelectron spectra. A linear relationship between log(wt%V4+/wt%V3+) and logpO2 is confirmed. Both (wt% V3+) and (wt% V5+) ions increase with increasing F/T ratio, whereas (wt% V4+) ions show the opposite behavior with increasing F/T ratio, irrespective of A/(S+A) ratio. Meanwhile, (wt% V3+) increase while (wt% V4+) and (wt% V5+) decrease with increasing A/(S+A) ratio. The linear relationship between log(wt%V3+/wt%V5+) and log(wt%V4+) has a slope of 1.8, which is good agreement with the theoretical slope of 2.0, which indicates that multi-valent vanadium ion species, i.e., V3+, V4+, and V5+, are thermodynamically balanced based on redox equilibria.Jungho HeoYumin LeeHyunsik ParkJoo Hyun ParkElsevierarticleVanadium oxideIlmenite smelting slagVanadium distribution ratioValence of vanadium ionsRedox equilibriaMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 5723-5732 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Vanadium oxide Ilmenite smelting slag Vanadium distribution ratio Valence of vanadium ions Redox equilibria Mining engineering. Metallurgy TN1-997
spellingShingle	Vanadium oxide Ilmenite smelting slag Vanadium distribution ratio Valence of vanadium ions Redox equilibria Mining engineering. Metallurgy TN1-997 Jungho Heo Yumin Lee Hyunsik Park Joo Hyun Park Influence of slag composition and oxygen potential on thermodynamic behavior of vanadium in FeO-TiO2-MgO-SiO2-Al2O3 smelting slag and molten iron
description	The influence of slag composition of FeO/TiO2 (=F/T) ratio, Al2O3/(SiO2+Al2O3) (=A/(S+A)) ratio and oxygen partial pressure (pO2=10−10to10−9atm) on the thermodynamic behavior of vanadium oxide in molten ilmenite smelting slag, i.e., FetO-TiO2-MgO-Al2O3-SiO2 system, was investigated at 1550 °C. The distribution ratio of vanadium (=LV) between molten iron and FetO-TiO2-MgO-Al2O3-SiO2 slag increases with increasing F/T ratio, while it decreases with increasing A/(S+A) ratio. In addition, logLV generally increases with increasing theoretical optical basicity of the slag (=Λslag). Vanadium oxide (VOx) is expected to behave as an acidic component in the present system. Vanadium in ilmenite smelting slags primarily consist of V3+, V4+, and V5+ ions, as determined by Gaussian deconvolution of X-ray photoelectron spectra. A linear relationship between log(wt%V4+/wt%V3+) and logpO2 is confirmed. Both (wt% V3+) and (wt% V5+) ions increase with increasing F/T ratio, whereas (wt% V4+) ions show the opposite behavior with increasing F/T ratio, irrespective of A/(S+A) ratio. Meanwhile, (wt% V3+) increase while (wt% V4+) and (wt% V5+) decrease with increasing A/(S+A) ratio. The linear relationship between log(wt%V3+/wt%V5+) and log(wt%V4+) has a slope of 1.8, which is good agreement with the theoretical slope of 2.0, which indicates that multi-valent vanadium ion species, i.e., V3+, V4+, and V5+, are thermodynamically balanced based on redox equilibria.
format	article
author	Jungho Heo Yumin Lee Hyunsik Park Joo Hyun Park
author_facet	Jungho Heo Yumin Lee Hyunsik Park Joo Hyun Park
author_sort	Jungho Heo
title	Influence of slag composition and oxygen potential on thermodynamic behavior of vanadium in FeO-TiO2-MgO-SiO2-Al2O3 smelting slag and molten iron
title_short	Influence of slag composition and oxygen potential on thermodynamic behavior of vanadium in FeO-TiO2-MgO-SiO2-Al2O3 smelting slag and molten iron
title_full	Influence of slag composition and oxygen potential on thermodynamic behavior of vanadium in FeO-TiO2-MgO-SiO2-Al2O3 smelting slag and molten iron
title_fullStr	Influence of slag composition and oxygen potential on thermodynamic behavior of vanadium in FeO-TiO2-MgO-SiO2-Al2O3 smelting slag and molten iron
title_full_unstemmed	Influence of slag composition and oxygen potential on thermodynamic behavior of vanadium in FeO-TiO2-MgO-SiO2-Al2O3 smelting slag and molten iron
title_sort	influence of slag composition and oxygen potential on thermodynamic behavior of vanadium in feo-tio2-mgo-sio2-al2o3 smelting slag and molten iron
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/78c1e5aa0d8449c49e3159a303cccc06
work_keys_str_mv	AT junghoheo influenceofslagcompositionandoxygenpotentialonthermodynamicbehaviorofvanadiuminfeotio2mgosio2al2o3smeltingslagandmolteniron AT yuminlee influenceofslagcompositionandoxygenpotentialonthermodynamicbehaviorofvanadiuminfeotio2mgosio2al2o3smeltingslagandmolteniron AT hyunsikpark influenceofslagcompositionandoxygenpotentialonthermodynamicbehaviorofvanadiuminfeotio2mgosio2al2o3smeltingslagandmolteniron AT joohyunpark influenceofslagcompositionandoxygenpotentialonthermodynamicbehaviorofvanadiuminfeotio2mgosio2al2o3smeltingslagandmolteniron
_version_	1718415983976120320

Influence of slag composition and oxygen potential on thermodynamic behavior of vanadium in FeO-TiO2-MgO-SiO2-Al2O3 smelting slag and molten iron

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