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Investigation of fluoride evaporation from CaF(2)–CaO–Al(2)O(3)–MgO–TiO(2)–(Li(2)O) slag for electroslag remelting

The isothermal kinetics of fluoride evaporation from CaF(2)–CaO–Al(2)O(3)–MgO–TiO(2)–(Li(2)O) slag with varying Li(2)O content were investigated in the temperature range 1743–1803 K by thermogravimetric analysis. Thermodynamic calculations and viscosity measurements were applied for studying the eva...

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Autores principales: Ju, Jiantao, Ji, Guangheng, Tang, Chenmei, Yang, Kangshuai, Zhu, Zhihong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7378172/
https://www.ncbi.nlm.nih.gov/pubmed/32704152
http://dx.doi.org/10.1038/s41598-020-69283-6
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author Ju, Jiantao
Ji, Guangheng
Tang, Chenmei
Yang, Kangshuai
Zhu, Zhihong
author_facet Ju, Jiantao
Ji, Guangheng
Tang, Chenmei
Yang, Kangshuai
Zhu, Zhihong
author_sort Ju, Jiantao
collection PubMed
description The isothermal kinetics of fluoride evaporation from CaF(2)–CaO–Al(2)O(3)–MgO–TiO(2)–(Li(2)O) slag with varying Li(2)O content were investigated in the temperature range 1743–1803 K by thermogravimetric analysis. Thermodynamic calculations and viscosity measurements were applied for studying the evaporation mechanism of fluoride. The results showed that the evaporation ratio increases with increasing Li(2)O content and temperature. The volatile constituents from the molten slags, mainly LiF and CaF(2), were detected and their concentrations calculated. The fluoride evaporation is primarily affected by the vapour pressure of LiF and CaF(2), viscosity of the slags, and melt-component activities under given experimental conditions. On the other hand, mass transfer of the gas is not the rate-controlling step that affects fluoride evaporation from the slags. The activation energy for fluoride evaporation gradually decreased from 193 ± 11 to 113 ± 3 kJ mol(−1) as the Li(2)O content in the slags increases from 0 to 5.48 wt%. These results hold great theoretical significance for developing low-fluoride slags for electroslag remelting.
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spelling pubmed-73781722020-07-24 Investigation of fluoride evaporation from CaF(2)–CaO–Al(2)O(3)–MgO–TiO(2)–(Li(2)O) slag for electroslag remelting Ju, Jiantao Ji, Guangheng Tang, Chenmei Yang, Kangshuai Zhu, Zhihong Sci Rep Article The isothermal kinetics of fluoride evaporation from CaF(2)–CaO–Al(2)O(3)–MgO–TiO(2)–(Li(2)O) slag with varying Li(2)O content were investigated in the temperature range 1743–1803 K by thermogravimetric analysis. Thermodynamic calculations and viscosity measurements were applied for studying the evaporation mechanism of fluoride. The results showed that the evaporation ratio increases with increasing Li(2)O content and temperature. The volatile constituents from the molten slags, mainly LiF and CaF(2), were detected and their concentrations calculated. The fluoride evaporation is primarily affected by the vapour pressure of LiF and CaF(2), viscosity of the slags, and melt-component activities under given experimental conditions. On the other hand, mass transfer of the gas is not the rate-controlling step that affects fluoride evaporation from the slags. The activation energy for fluoride evaporation gradually decreased from 193 ± 11 to 113 ± 3 kJ mol(−1) as the Li(2)O content in the slags increases from 0 to 5.48 wt%. These results hold great theoretical significance for developing low-fluoride slags for electroslag remelting. Nature Publishing Group UK 2020-07-23 /pmc/articles/PMC7378172/ /pubmed/32704152 http://dx.doi.org/10.1038/s41598-020-69283-6 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Ju, Jiantao
Ji, Guangheng
Tang, Chenmei
Yang, Kangshuai
Zhu, Zhihong
Investigation of fluoride evaporation from CaF(2)–CaO–Al(2)O(3)–MgO–TiO(2)–(Li(2)O) slag for electroslag remelting
title Investigation of fluoride evaporation from CaF(2)–CaO–Al(2)O(3)–MgO–TiO(2)–(Li(2)O) slag for electroslag remelting
title_full Investigation of fluoride evaporation from CaF(2)–CaO–Al(2)O(3)–MgO–TiO(2)–(Li(2)O) slag for electroslag remelting
title_fullStr Investigation of fluoride evaporation from CaF(2)–CaO–Al(2)O(3)–MgO–TiO(2)–(Li(2)O) slag for electroslag remelting
title_full_unstemmed Investigation of fluoride evaporation from CaF(2)–CaO–Al(2)O(3)–MgO–TiO(2)–(Li(2)O) slag for electroslag remelting
title_short Investigation of fluoride evaporation from CaF(2)–CaO–Al(2)O(3)–MgO–TiO(2)–(Li(2)O) slag for electroslag remelting
title_sort investigation of fluoride evaporation from caf(2)–cao–al(2)o(3)–mgo–tio(2)–(li(2)o) slag for electroslag remelting
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7378172/
https://www.ncbi.nlm.nih.gov/pubmed/32704152
http://dx.doi.org/10.1038/s41598-020-69283-6
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