Cargando…

Dissolution Behavior of Lime with Different Properties into Converter Slag

China’s 2022 crude steel production soared to an impressive 1.018 billion tons, and steel slag constituted approximately 10% to 15% of this massive output. However, a notable hindrance to the comprehensive utilization of steel slag arises from the fact that it contains 10% to 20% of free calcium oxi...

Descripción completa

Detalles Bibliográficos
Autores principales: Zhang, Mengxu, Li, Jianli, Jia, Cao, Yu, Yue
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10573346/
https://www.ncbi.nlm.nih.gov/pubmed/37834623
http://dx.doi.org/10.3390/ma16196487
_version_ 1785120440980602880
author Zhang, Mengxu
Li, Jianli
Jia, Cao
Yu, Yue
author_facet Zhang, Mengxu
Li, Jianli
Jia, Cao
Yu, Yue
author_sort Zhang, Mengxu
collection PubMed
description China’s 2022 crude steel production soared to an impressive 1.018 billion tons, and steel slag constituted approximately 10% to 15% of this massive output. However, a notable hindrance to the comprehensive utilization of steel slag arises from the fact that it contains 10% to 20% of free calcium oxide (f-CaO), resulting in volume instability. To address this challenge, our study delved into the dynamic transformation of the interface between lime and slag, as well as the fluctuations in the dissolution rate of lime. An Electron Probe Micro Analyzer, equipped with an energy-dispersive spectrometer, was employed for the analysis. Our findings revealed that the configuration of the reaction interface between quicklime and slag underwent alterations throughout various phases of converter smelting. At a temperature of 1400 °C, several significant transformations occurred, including the formation of a CaO-FeO solid solution, (Ca, Mg, Fe) olivine, and low-melting point (Ca, Mg) silicate minerals. With the gradual reduction in FeO content, a robust and high-melting 2CaO·SiO(2) layer emerged, generated through the interaction between CaO and (Ca, Mg, Fe) olivine. Furthermore, for lime with a particle size of 20 mm and a calcination rate of 0%, the thickest layer of 2CaO·SiO(2) was observed after 120 s of dissolution in slag A2 at 1400 °C. Overall, the dissolution rates of lime with different particle sizes in slag A1 to A4 showed a gradual increase. On the other hand, the dissolution rates of lime with different calcination rates in slag A1 to A4 exhibited an initial increase, followed by a decrease, and then another increase. The formation of a high-melting point and continuous dense 2CaO·SiO(2) layer during the dissolution process hindered the mass transfer between lime and slag.
format Online
Article
Text
id pubmed-10573346
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-105733462023-10-14 Dissolution Behavior of Lime with Different Properties into Converter Slag Zhang, Mengxu Li, Jianli Jia, Cao Yu, Yue Materials (Basel) Article China’s 2022 crude steel production soared to an impressive 1.018 billion tons, and steel slag constituted approximately 10% to 15% of this massive output. However, a notable hindrance to the comprehensive utilization of steel slag arises from the fact that it contains 10% to 20% of free calcium oxide (f-CaO), resulting in volume instability. To address this challenge, our study delved into the dynamic transformation of the interface between lime and slag, as well as the fluctuations in the dissolution rate of lime. An Electron Probe Micro Analyzer, equipped with an energy-dispersive spectrometer, was employed for the analysis. Our findings revealed that the configuration of the reaction interface between quicklime and slag underwent alterations throughout various phases of converter smelting. At a temperature of 1400 °C, several significant transformations occurred, including the formation of a CaO-FeO solid solution, (Ca, Mg, Fe) olivine, and low-melting point (Ca, Mg) silicate minerals. With the gradual reduction in FeO content, a robust and high-melting 2CaO·SiO(2) layer emerged, generated through the interaction between CaO and (Ca, Mg, Fe) olivine. Furthermore, for lime with a particle size of 20 mm and a calcination rate of 0%, the thickest layer of 2CaO·SiO(2) was observed after 120 s of dissolution in slag A2 at 1400 °C. Overall, the dissolution rates of lime with different particle sizes in slag A1 to A4 showed a gradual increase. On the other hand, the dissolution rates of lime with different calcination rates in slag A1 to A4 exhibited an initial increase, followed by a decrease, and then another increase. The formation of a high-melting point and continuous dense 2CaO·SiO(2) layer during the dissolution process hindered the mass transfer between lime and slag. MDPI 2023-09-29 /pmc/articles/PMC10573346/ /pubmed/37834623 http://dx.doi.org/10.3390/ma16196487 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhang, Mengxu
Li, Jianli
Jia, Cao
Yu, Yue
Dissolution Behavior of Lime with Different Properties into Converter Slag
title Dissolution Behavior of Lime with Different Properties into Converter Slag
title_full Dissolution Behavior of Lime with Different Properties into Converter Slag
title_fullStr Dissolution Behavior of Lime with Different Properties into Converter Slag
title_full_unstemmed Dissolution Behavior of Lime with Different Properties into Converter Slag
title_short Dissolution Behavior of Lime with Different Properties into Converter Slag
title_sort dissolution behavior of lime with different properties into converter slag
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10573346/
https://www.ncbi.nlm.nih.gov/pubmed/37834623
http://dx.doi.org/10.3390/ma16196487
work_keys_str_mv AT zhangmengxu dissolutionbehavioroflimewithdifferentpropertiesintoconverterslag
AT lijianli dissolutionbehavioroflimewithdifferentpropertiesintoconverterslag
AT jiacao dissolutionbehavioroflimewithdifferentpropertiesintoconverterslag
AT yuyue dissolutionbehavioroflimewithdifferentpropertiesintoconverterslag