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Effect of oxygen partial pressure and B2O3 on crystallization behavior of phosphorus- and iron-containing phases in a CaO–SiO2–Fe2O3–P2O5 melt
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Li, Juncheng, Li, Guoxuan, Liang, Jinshan, Guan, Dong, Li, Jingwei, Zhang, Yanling, Wu, Shaowen, Sridhar, Seetharaman and Li, Zushu (2023) Effect of oxygen partial pressure and B2O3 on crystallization behavior of phosphorus- and iron-containing phases in a CaO–SiO2–Fe2O3–P2O5 melt. Metallurgical and Materials Transactions B, 54 . pp. 249-262. doi:10.1007/s11663-022-02686-0 ISSN 1073-5615.
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WRAP-Effect-of-oxygen-partial-pressure-and-B2O3-on-crystallization-behavior-of-phosphorus-and-iron-containing-phases-in-a-CaO-SiO2-Fe2O3-P2O5-melt-Li-2023.pdf - Accepted Version - Requires a PDF viewer. Download (1635Kb) | Preview |
Official URL: https://doi.org/10.1007/s11663-022-02686-0
Abstract
To help maintain the sustainability of the steel industry by improving slag utilization, we are developing a novel process to recover P and Fe from steelmaking slag by controlling oxygen partial pressure and adding slag modifier B2O3, to control the precipitation of targeted phases. In this paper, the precipitated phases of the molten synthetic CaO–SiO2–FeO–P2O5(–B2O3) slags were predicted through thermodynamic calculations using FactSage 8.1. A confocal laser scanning microscope (CLSM) was used to in situ observe the crystallization behavior of the targeted metal oxides in the slags. It was found that iron and phosphorus could be recovered in the form of magnetite (Fe3O4) and calcium phosphate (Ca10P6O25) phases by controlling oxygen partial pressure and adding slag modifier B2O3. By changing oxygen partial pressure from 0.21 to 10–6 atm, the iron-containing phase transformed from Ca2Fe2O5 to magnetite (Fe3O4). Through the introduction of B2O3 from 2 to 8 pct, the amount of calcium phosphate (Ca10P6O25) first increased and then decreased, with the maximum of 28 pct (e.g. 28/100 g slag studied) at 6 pct B2O3.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TN Mining engineering. Metallurgy T Technology > TP Chemical technology |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Steelwork, Slag , Magnetite, Calcium phosphate, Steel -- Metallurgy -- Oxygen processes | |||||||||||||||
Journal or Publication Title: | Metallurgical and Materials Transactions B | |||||||||||||||
Publisher: | Springer New York LLC | |||||||||||||||
ISSN: | 1073-5615 | |||||||||||||||
Official Date: | February 2023 | |||||||||||||||
Dates: |
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Volume: | 54 | |||||||||||||||
Page Range: | pp. 249-262 | |||||||||||||||
DOI: | 10.1007/s11663-022-02686-0 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
Copyright Holders: | The Minerals, Metals & Materials Society and ASM International | |||||||||||||||
Date of first compliant deposit: | 3 January 2023 | |||||||||||||||
Date of first compliant Open Access: | 22 November 2023 | |||||||||||||||
RIOXX Funder/Project Grant: |
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