Low-temperature Roasting Desulfurization of High-sulfur Bauxite and Study on Desulfurization Kinetic
Abstract Roasting is an effective and rapid method for achieving the desulfurization of high-sulfur bauxite to meet the requirements of digestion in the Bayer process. Most current research focuses on the roasting desulfurization of high-sulfur bauxite in the high-temperature region of 600–800 ℃. In...
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| Autor*in: |
Xie, Mingzhuang [verfasserIn] Zhang, Xin [verfasserIn] Wu, Zegang [verfasserIn] Liu, Fengqin [verfasserIn] Xie, Chengming [verfasserIn] Zhao, Hongliang [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2024 |
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© Society for Mining, Metallurgy & Exploration Inc. 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
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Enthalten in: Mining, metallurgy & exploration - Springer International Publishing, 2019, 41(2024), 4 vom: 11. Juni, Seite 1967-1977 |
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| Übergeordnetes Werk: |
volume:41 ; year:2024 ; number:4 ; day:11 ; month:06 ; pages:1967-1977 |
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| DOI / URN: |
10.1007/s42461-024-01022-1 |
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SPR056892292 |
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| 520 | |a Abstract Roasting is an effective and rapid method for achieving the desulfurization of high-sulfur bauxite to meet the requirements of digestion in the Bayer process. Most current research focuses on the roasting desulfurization of high-sulfur bauxite in the high-temperature region of 600–800 ℃. In this work, the thermodynamic and kinetic characteristics of desulfurization reactions were studied during the roasting process at low temperatures of < 600 ℃. The effects of roasting temperature, roasting time, and particle grinding size on the desulfurization reaction kinetics and phase transformation were explored, and the results show that the pyrite and diaspore in high-sulfur bauxite start to oxidize and dehydrate at about 432 ℃ and 470 ℃, respectively. Comprehensively considering the roasting energy consumption and desulfurization effect, suitable conditions for roasting are a temperature of 500–550 ℃, a roasting time of about 10 min, and a particle size of 0.150–0.830 mm. Under these conditions, the desulfurization ratio of sulfur in the form of $ S^{2−} $ in roasted ore is more than 90%, the mass fraction of $ S^{2−} $ is less than 0.1%, and the total sulfur (including $ SO_{4} $2− and $ S^{2−} $) desulfurization ratio is more than 70%. Kinetic analysis shows that this oxidative desulfurization reaction is a second-order reaction. When the particle size is 0.150–0.830 mm and the temperature is 450–525 ℃, the apparent activation energy is 63.546–64.746 kJ·$ mol^{−1} $ and the interfacial chemical reaction is as the rate-controlling step of the desulfurization process. | ||
| 650 | 4 | |a High-sulfur Bauxite |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Desulfurization |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Low-temperature Roasting |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Roasting Kinetics |7 (dpeaa)DE-He213 | |
| 700 | 1 | |a Zhang, Xin |e verfasserin |4 aut | |
| 700 | 1 | |a Wu, Zegang |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Fengqin |e verfasserin |4 aut | |
| 700 | 1 | |a Xie, Chengming |e verfasserin |4 aut | |
| 700 | 1 | |a Zhao, Hongliang |e verfasserin |4 aut | |
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10.1007/s42461-024-01022-1 doi (DE-627)SPR056892292 (SPR)s42461-024-01022-1-e DE-627 ger DE-627 rakwb eng 620 660 VZ 620 660 VZ Xie, Mingzhuang verfasserin aut Low-temperature Roasting Desulfurization of High-sulfur Bauxite and Study on Desulfurization Kinetic 2024 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Society for Mining, Metallurgy & Exploration Inc. 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract Roasting is an effective and rapid method for achieving the desulfurization of high-sulfur bauxite to meet the requirements of digestion in the Bayer process. Most current research focuses on the roasting desulfurization of high-sulfur bauxite in the high-temperature region of 600–800 ℃. In this work, the thermodynamic and kinetic characteristics of desulfurization reactions were studied during the roasting process at low temperatures of < 600 ℃. The effects of roasting temperature, roasting time, and particle grinding size on the desulfurization reaction kinetics and phase transformation were explored, and the results show that the pyrite and diaspore in high-sulfur bauxite start to oxidize and dehydrate at about 432 ℃ and 470 ℃, respectively. Comprehensively considering the roasting energy consumption and desulfurization effect, suitable conditions for roasting are a temperature of 500–550 ℃, a roasting time of about 10 min, and a particle size of 0.150–0.830 mm. Under these conditions, the desulfurization ratio of sulfur in the form of $ S^{2−} $ in roasted ore is more than 90%, the mass fraction of $ S^{2−} $ is less than 0.1%, and the total sulfur (including $ SO_{4} $2− and $ S^{2−} $) desulfurization ratio is more than 70%. Kinetic analysis shows that this oxidative desulfurization reaction is a second-order reaction. When the particle size is 0.150–0.830 mm and the temperature is 450–525 ℃, the apparent activation energy is 63.546–64.746 kJ·$ mol^{−1} $ and the interfacial chemical reaction is as the rate-controlling step of the desulfurization process. High-sulfur Bauxite (dpeaa)DE-He213 Desulfurization (dpeaa)DE-He213 Low-temperature Roasting (dpeaa)DE-He213 Roasting Kinetics (dpeaa)DE-He213 Zhang, Xin verfasserin aut Wu, Zegang verfasserin aut Liu, Fengqin verfasserin aut Xie, Chengming verfasserin aut Zhao, Hongliang verfasserin aut Enthalten in Mining, metallurgy & exploration Springer International Publishing, 2019 41(2024), 4 vom: 11. Juni, Seite 1967-1977 (DE-627)1039800637 (DE-600)2947829-7 2524-3470 nnns volume:41 year:2024 number:4 day:11 month:06 pages:1967-1977 https://dx.doi.org/10.1007/s42461-024-01022-1 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OLC-PHA AR 41 2024 4 11 06 1967-1977 |
| spelling |
10.1007/s42461-024-01022-1 doi (DE-627)SPR056892292 (SPR)s42461-024-01022-1-e DE-627 ger DE-627 rakwb eng 620 660 VZ 620 660 VZ Xie, Mingzhuang verfasserin aut Low-temperature Roasting Desulfurization of High-sulfur Bauxite and Study on Desulfurization Kinetic 2024 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Society for Mining, Metallurgy & Exploration Inc. 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract Roasting is an effective and rapid method for achieving the desulfurization of high-sulfur bauxite to meet the requirements of digestion in the Bayer process. Most current research focuses on the roasting desulfurization of high-sulfur bauxite in the high-temperature region of 600–800 ℃. In this work, the thermodynamic and kinetic characteristics of desulfurization reactions were studied during the roasting process at low temperatures of < 600 ℃. The effects of roasting temperature, roasting time, and particle grinding size on the desulfurization reaction kinetics and phase transformation were explored, and the results show that the pyrite and diaspore in high-sulfur bauxite start to oxidize and dehydrate at about 432 ℃ and 470 ℃, respectively. Comprehensively considering the roasting energy consumption and desulfurization effect, suitable conditions for roasting are a temperature of 500–550 ℃, a roasting time of about 10 min, and a particle size of 0.150–0.830 mm. Under these conditions, the desulfurization ratio of sulfur in the form of $ S^{2−} $ in roasted ore is more than 90%, the mass fraction of $ S^{2−} $ is less than 0.1%, and the total sulfur (including $ SO_{4} $2− and $ S^{2−} $) desulfurization ratio is more than 70%. Kinetic analysis shows that this oxidative desulfurization reaction is a second-order reaction. When the particle size is 0.150–0.830 mm and the temperature is 450–525 ℃, the apparent activation energy is 63.546–64.746 kJ·$ mol^{−1} $ and the interfacial chemical reaction is as the rate-controlling step of the desulfurization process. High-sulfur Bauxite (dpeaa)DE-He213 Desulfurization (dpeaa)DE-He213 Low-temperature Roasting (dpeaa)DE-He213 Roasting Kinetics (dpeaa)DE-He213 Zhang, Xin verfasserin aut Wu, Zegang verfasserin aut Liu, Fengqin verfasserin aut Xie, Chengming verfasserin aut Zhao, Hongliang verfasserin aut Enthalten in Mining, metallurgy & exploration Springer International Publishing, 2019 41(2024), 4 vom: 11. Juni, Seite 1967-1977 (DE-627)1039800637 (DE-600)2947829-7 2524-3470 nnns volume:41 year:2024 number:4 day:11 month:06 pages:1967-1977 https://dx.doi.org/10.1007/s42461-024-01022-1 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OLC-PHA AR 41 2024 4 11 06 1967-1977 |
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10.1007/s42461-024-01022-1 doi (DE-627)SPR056892292 (SPR)s42461-024-01022-1-e DE-627 ger DE-627 rakwb eng 620 660 VZ 620 660 VZ Xie, Mingzhuang verfasserin aut Low-temperature Roasting Desulfurization of High-sulfur Bauxite and Study on Desulfurization Kinetic 2024 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Society for Mining, Metallurgy & Exploration Inc. 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract Roasting is an effective and rapid method for achieving the desulfurization of high-sulfur bauxite to meet the requirements of digestion in the Bayer process. Most current research focuses on the roasting desulfurization of high-sulfur bauxite in the high-temperature region of 600–800 ℃. In this work, the thermodynamic and kinetic characteristics of desulfurization reactions were studied during the roasting process at low temperatures of < 600 ℃. The effects of roasting temperature, roasting time, and particle grinding size on the desulfurization reaction kinetics and phase transformation were explored, and the results show that the pyrite and diaspore in high-sulfur bauxite start to oxidize and dehydrate at about 432 ℃ and 470 ℃, respectively. Comprehensively considering the roasting energy consumption and desulfurization effect, suitable conditions for roasting are a temperature of 500–550 ℃, a roasting time of about 10 min, and a particle size of 0.150–0.830 mm. Under these conditions, the desulfurization ratio of sulfur in the form of $ S^{2−} $ in roasted ore is more than 90%, the mass fraction of $ S^{2−} $ is less than 0.1%, and the total sulfur (including $ SO_{4} $2− and $ S^{2−} $) desulfurization ratio is more than 70%. Kinetic analysis shows that this oxidative desulfurization reaction is a second-order reaction. When the particle size is 0.150–0.830 mm and the temperature is 450–525 ℃, the apparent activation energy is 63.546–64.746 kJ·$ mol^{−1} $ and the interfacial chemical reaction is as the rate-controlling step of the desulfurization process. High-sulfur Bauxite (dpeaa)DE-He213 Desulfurization (dpeaa)DE-He213 Low-temperature Roasting (dpeaa)DE-He213 Roasting Kinetics (dpeaa)DE-He213 Zhang, Xin verfasserin aut Wu, Zegang verfasserin aut Liu, Fengqin verfasserin aut Xie, Chengming verfasserin aut Zhao, Hongliang verfasserin aut Enthalten in Mining, metallurgy & exploration Springer International Publishing, 2019 41(2024), 4 vom: 11. Juni, Seite 1967-1977 (DE-627)1039800637 (DE-600)2947829-7 2524-3470 nnns volume:41 year:2024 number:4 day:11 month:06 pages:1967-1977 https://dx.doi.org/10.1007/s42461-024-01022-1 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OLC-PHA AR 41 2024 4 11 06 1967-1977 |
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10.1007/s42461-024-01022-1 doi (DE-627)SPR056892292 (SPR)s42461-024-01022-1-e DE-627 ger DE-627 rakwb eng 620 660 VZ 620 660 VZ Xie, Mingzhuang verfasserin aut Low-temperature Roasting Desulfurization of High-sulfur Bauxite and Study on Desulfurization Kinetic 2024 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Society for Mining, Metallurgy & Exploration Inc. 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract Roasting is an effective and rapid method for achieving the desulfurization of high-sulfur bauxite to meet the requirements of digestion in the Bayer process. Most current research focuses on the roasting desulfurization of high-sulfur bauxite in the high-temperature region of 600–800 ℃. In this work, the thermodynamic and kinetic characteristics of desulfurization reactions were studied during the roasting process at low temperatures of < 600 ℃. The effects of roasting temperature, roasting time, and particle grinding size on the desulfurization reaction kinetics and phase transformation were explored, and the results show that the pyrite and diaspore in high-sulfur bauxite start to oxidize and dehydrate at about 432 ℃ and 470 ℃, respectively. Comprehensively considering the roasting energy consumption and desulfurization effect, suitable conditions for roasting are a temperature of 500–550 ℃, a roasting time of about 10 min, and a particle size of 0.150–0.830 mm. Under these conditions, the desulfurization ratio of sulfur in the form of $ S^{2−} $ in roasted ore is more than 90%, the mass fraction of $ S^{2−} $ is less than 0.1%, and the total sulfur (including $ SO_{4} $2− and $ S^{2−} $) desulfurization ratio is more than 70%. Kinetic analysis shows that this oxidative desulfurization reaction is a second-order reaction. When the particle size is 0.150–0.830 mm and the temperature is 450–525 ℃, the apparent activation energy is 63.546–64.746 kJ·$ mol^{−1} $ and the interfacial chemical reaction is as the rate-controlling step of the desulfurization process. High-sulfur Bauxite (dpeaa)DE-He213 Desulfurization (dpeaa)DE-He213 Low-temperature Roasting (dpeaa)DE-He213 Roasting Kinetics (dpeaa)DE-He213 Zhang, Xin verfasserin aut Wu, Zegang verfasserin aut Liu, Fengqin verfasserin aut Xie, Chengming verfasserin aut Zhao, Hongliang verfasserin aut Enthalten in Mining, metallurgy & exploration Springer International Publishing, 2019 41(2024), 4 vom: 11. Juni, Seite 1967-1977 (DE-627)1039800637 (DE-600)2947829-7 2524-3470 nnns volume:41 year:2024 number:4 day:11 month:06 pages:1967-1977 https://dx.doi.org/10.1007/s42461-024-01022-1 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OLC-PHA AR 41 2024 4 11 06 1967-1977 |
| allfieldsSound |
10.1007/s42461-024-01022-1 doi (DE-627)SPR056892292 (SPR)s42461-024-01022-1-e DE-627 ger DE-627 rakwb eng 620 660 VZ 620 660 VZ Xie, Mingzhuang verfasserin aut Low-temperature Roasting Desulfurization of High-sulfur Bauxite and Study on Desulfurization Kinetic 2024 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Society for Mining, Metallurgy & Exploration Inc. 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract Roasting is an effective and rapid method for achieving the desulfurization of high-sulfur bauxite to meet the requirements of digestion in the Bayer process. Most current research focuses on the roasting desulfurization of high-sulfur bauxite in the high-temperature region of 600–800 ℃. In this work, the thermodynamic and kinetic characteristics of desulfurization reactions were studied during the roasting process at low temperatures of < 600 ℃. The effects of roasting temperature, roasting time, and particle grinding size on the desulfurization reaction kinetics and phase transformation were explored, and the results show that the pyrite and diaspore in high-sulfur bauxite start to oxidize and dehydrate at about 432 ℃ and 470 ℃, respectively. Comprehensively considering the roasting energy consumption and desulfurization effect, suitable conditions for roasting are a temperature of 500–550 ℃, a roasting time of about 10 min, and a particle size of 0.150–0.830 mm. Under these conditions, the desulfurization ratio of sulfur in the form of $ S^{2−} $ in roasted ore is more than 90%, the mass fraction of $ S^{2−} $ is less than 0.1%, and the total sulfur (including $ SO_{4} $2− and $ S^{2−} $) desulfurization ratio is more than 70%. Kinetic analysis shows that this oxidative desulfurization reaction is a second-order reaction. When the particle size is 0.150–0.830 mm and the temperature is 450–525 ℃, the apparent activation energy is 63.546–64.746 kJ·$ mol^{−1} $ and the interfacial chemical reaction is as the rate-controlling step of the desulfurization process. High-sulfur Bauxite (dpeaa)DE-He213 Desulfurization (dpeaa)DE-He213 Low-temperature Roasting (dpeaa)DE-He213 Roasting Kinetics (dpeaa)DE-He213 Zhang, Xin verfasserin aut Wu, Zegang verfasserin aut Liu, Fengqin verfasserin aut Xie, Chengming verfasserin aut Zhao, Hongliang verfasserin aut Enthalten in Mining, metallurgy & exploration Springer International Publishing, 2019 41(2024), 4 vom: 11. Juni, Seite 1967-1977 (DE-627)1039800637 (DE-600)2947829-7 2524-3470 nnns volume:41 year:2024 number:4 day:11 month:06 pages:1967-1977 https://dx.doi.org/10.1007/s42461-024-01022-1 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OLC-PHA AR 41 2024 4 11 06 1967-1977 |
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Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract Roasting is an effective and rapid method for achieving the desulfurization of high-sulfur bauxite to meet the requirements of digestion in the Bayer process. Most current research focuses on the roasting desulfurization of high-sulfur bauxite in the high-temperature region of 600–800 ℃. In this work, the thermodynamic and kinetic characteristics of desulfurization reactions were studied during the roasting process at low temperatures of < 600 ℃. The effects of roasting temperature, roasting time, and particle grinding size on the desulfurization reaction kinetics and phase transformation were explored, and the results show that the pyrite and diaspore in high-sulfur bauxite start to oxidize and dehydrate at about 432 ℃ and 470 ℃, respectively. Comprehensively considering the roasting energy consumption and desulfurization effect, suitable conditions for roasting are a temperature of 500–550 ℃, a roasting time of about 10 min, and a particle size of 0.150–0.830 mm. Under these conditions, the desulfurization ratio of sulfur in the form of $ S^{2−} $ in roasted ore is more than 90%, the mass fraction of $ S^{2−} $ is less than 0.1%, and the total sulfur (including $ SO_{4} $2− and $ S^{2−} $) desulfurization ratio is more than 70%. Kinetic analysis shows that this oxidative desulfurization reaction is a second-order reaction. 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Low-temperature Roasting Desulfurization of High-sulfur Bauxite and Study on Desulfurization Kinetic |
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Abstract Roasting is an effective and rapid method for achieving the desulfurization of high-sulfur bauxite to meet the requirements of digestion in the Bayer process. Most current research focuses on the roasting desulfurization of high-sulfur bauxite in the high-temperature region of 600–800 ℃. In this work, the thermodynamic and kinetic characteristics of desulfurization reactions were studied during the roasting process at low temperatures of < 600 ℃. The effects of roasting temperature, roasting time, and particle grinding size on the desulfurization reaction kinetics and phase transformation were explored, and the results show that the pyrite and diaspore in high-sulfur bauxite start to oxidize and dehydrate at about 432 ℃ and 470 ℃, respectively. Comprehensively considering the roasting energy consumption and desulfurization effect, suitable conditions for roasting are a temperature of 500–550 ℃, a roasting time of about 10 min, and a particle size of 0.150–0.830 mm. Under these conditions, the desulfurization ratio of sulfur in the form of $ S^{2−} $ in roasted ore is more than 90%, the mass fraction of $ S^{2−} $ is less than 0.1%, and the total sulfur (including $ SO_{4} $2− and $ S^{2−} $) desulfurization ratio is more than 70%. Kinetic analysis shows that this oxidative desulfurization reaction is a second-order reaction. When the particle size is 0.150–0.830 mm and the temperature is 450–525 ℃, the apparent activation energy is 63.546–64.746 kJ·$ mol^{−1} $ and the interfacial chemical reaction is as the rate-controlling step of the desulfurization process. © Society for Mining, Metallurgy & Exploration Inc. 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
| abstractGer |
Abstract Roasting is an effective and rapid method for achieving the desulfurization of high-sulfur bauxite to meet the requirements of digestion in the Bayer process. Most current research focuses on the roasting desulfurization of high-sulfur bauxite in the high-temperature region of 600–800 ℃. In this work, the thermodynamic and kinetic characteristics of desulfurization reactions were studied during the roasting process at low temperatures of < 600 ℃. The effects of roasting temperature, roasting time, and particle grinding size on the desulfurization reaction kinetics and phase transformation were explored, and the results show that the pyrite and diaspore in high-sulfur bauxite start to oxidize and dehydrate at about 432 ℃ and 470 ℃, respectively. Comprehensively considering the roasting energy consumption and desulfurization effect, suitable conditions for roasting are a temperature of 500–550 ℃, a roasting time of about 10 min, and a particle size of 0.150–0.830 mm. Under these conditions, the desulfurization ratio of sulfur in the form of $ S^{2−} $ in roasted ore is more than 90%, the mass fraction of $ S^{2−} $ is less than 0.1%, and the total sulfur (including $ SO_{4} $2− and $ S^{2−} $) desulfurization ratio is more than 70%. Kinetic analysis shows that this oxidative desulfurization reaction is a second-order reaction. When the particle size is 0.150–0.830 mm and the temperature is 450–525 ℃, the apparent activation energy is 63.546–64.746 kJ·$ mol^{−1} $ and the interfacial chemical reaction is as the rate-controlling step of the desulfurization process. © Society for Mining, Metallurgy & Exploration Inc. 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
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Abstract Roasting is an effective and rapid method for achieving the desulfurization of high-sulfur bauxite to meet the requirements of digestion in the Bayer process. Most current research focuses on the roasting desulfurization of high-sulfur bauxite in the high-temperature region of 600–800 ℃. In this work, the thermodynamic and kinetic characteristics of desulfurization reactions were studied during the roasting process at low temperatures of < 600 ℃. The effects of roasting temperature, roasting time, and particle grinding size on the desulfurization reaction kinetics and phase transformation were explored, and the results show that the pyrite and diaspore in high-sulfur bauxite start to oxidize and dehydrate at about 432 ℃ and 470 ℃, respectively. Comprehensively considering the roasting energy consumption and desulfurization effect, suitable conditions for roasting are a temperature of 500–550 ℃, a roasting time of about 10 min, and a particle size of 0.150–0.830 mm. Under these conditions, the desulfurization ratio of sulfur in the form of $ S^{2−} $ in roasted ore is more than 90%, the mass fraction of $ S^{2−} $ is less than 0.1%, and the total sulfur (including $ SO_{4} $2− and $ S^{2−} $) desulfurization ratio is more than 70%. Kinetic analysis shows that this oxidative desulfurization reaction is a second-order reaction. When the particle size is 0.150–0.830 mm and the temperature is 450–525 ℃, the apparent activation energy is 63.546–64.746 kJ·$ mol^{−1} $ and the interfacial chemical reaction is as the rate-controlling step of the desulfurization process. © Society for Mining, Metallurgy & Exploration Inc. 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
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