Kinetic analysis of the reduction of hematite fines by cold hydrogen plasma
This study deals with the reduction of hematite fines by cold hydrogen plasma in the temperature range of 360–450 °C. It aims to examine the rate-controlling processes of fine hematite reduction by hydrogen plasma. The gaseous reduction was also performed for comparison. The reduction experiments we...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-09-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422011851 |
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| author | Tiago Bristt Gonoring Adonias Ribeiro Franco, Jr. Estéfano Aparecido Vieira Ramiro Conceição Nascimento |
| author_facet | Tiago Bristt Gonoring Adonias Ribeiro Franco, Jr. Estéfano Aparecido Vieira Ramiro Conceição Nascimento |
| author_sort | Tiago Bristt Gonoring |
| collection | DOAJ |
| description | This study deals with the reduction of hematite fines by cold hydrogen plasma in the temperature range of 360–450 °C. It aims to examine the rate-controlling processes of fine hematite reduction by hydrogen plasma. The gaseous reduction was also performed for comparison. The reduction experiments were performed in a DC pulsed plasma reactor and the phases were characterized by X-ray diffraction. Reacted fraction curves were obtained by using the gravimetric technique. The kinetic analysis suggests that the controlling step of the hematite reduction process by cold hydrogen plasma was the nucleation and growth of iron on the magnetite substrate. The controlling step for the gaseous reduction process was found to be the chemical reaction at the magnetite–gas interface. The activation energy values obtained for cold plasma and gaseous hydrogen reduction processes were 68.5 and 87.2 kJ/mol. |
| first_indexed | 2024-12-10T04:43:28Z |
| format | Article |
| id | doaj.art-d5fc6c8fbc194909b56e23abaa2fab5e |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-10T04:43:28Z |
| publishDate | 2022-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-d5fc6c8fbc194909b56e23abaa2fab5e2022-12-22T02:01:50ZengElsevierJournal of Materials Research and Technology2238-78542022-09-012021732187Kinetic analysis of the reduction of hematite fines by cold hydrogen plasmaTiago Bristt Gonoring0Adonias Ribeiro Franco, Jr.1Estéfano Aparecido Vieira2Ramiro Conceição Nascimento3Corresponding author.; Postgraduate Program in Metallurgical and Materials Engineering, Federal Institute of Education, Science and Technology of Espírito Santo, Avenue Vitória, 1729, Vitória, ES, BrazilPostgraduate Program in Metallurgical and Materials Engineering, Federal Institute of Education, Science and Technology of Espírito Santo, Avenue Vitória, 1729, Vitória, ES, BrazilPostgraduate Program in Metallurgical and Materials Engineering, Federal Institute of Education, Science and Technology of Espírito Santo, Avenue Vitória, 1729, Vitória, ES, BrazilPostgraduate Program in Metallurgical and Materials Engineering, Federal Institute of Education, Science and Technology of Espírito Santo, Avenue Vitória, 1729, Vitória, ES, BrazilThis study deals with the reduction of hematite fines by cold hydrogen plasma in the temperature range of 360–450 °C. It aims to examine the rate-controlling processes of fine hematite reduction by hydrogen plasma. The gaseous reduction was also performed for comparison. The reduction experiments were performed in a DC pulsed plasma reactor and the phases were characterized by X-ray diffraction. Reacted fraction curves were obtained by using the gravimetric technique. The kinetic analysis suggests that the controlling step of the hematite reduction process by cold hydrogen plasma was the nucleation and growth of iron on the magnetite substrate. The controlling step for the gaseous reduction process was found to be the chemical reaction at the magnetite–gas interface. The activation energy values obtained for cold plasma and gaseous hydrogen reduction processes were 68.5 and 87.2 kJ/mol.http://www.sciencedirect.com/science/article/pii/S2238785422011851Iron oxide reductionsHydrogen plasmaCold plasmaKinetic modelSolid-state reactionAvrami-Erofe'ev equation |
| spellingShingle | Tiago Bristt Gonoring Adonias Ribeiro Franco, Jr. Estéfano Aparecido Vieira Ramiro Conceição Nascimento Kinetic analysis of the reduction of hematite fines by cold hydrogen plasma Journal of Materials Research and Technology Iron oxide reductions Hydrogen plasma Cold plasma Kinetic model Solid-state reaction Avrami-Erofe'ev equation |
| title | Kinetic analysis of the reduction of hematite fines by cold hydrogen plasma |
| title_full | Kinetic analysis of the reduction of hematite fines by cold hydrogen plasma |
| title_fullStr | Kinetic analysis of the reduction of hematite fines by cold hydrogen plasma |
| title_full_unstemmed | Kinetic analysis of the reduction of hematite fines by cold hydrogen plasma |
| title_short | Kinetic analysis of the reduction of hematite fines by cold hydrogen plasma |
| title_sort | kinetic analysis of the reduction of hematite fines by cold hydrogen plasma |
| topic | Iron oxide reductions Hydrogen plasma Cold plasma Kinetic model Solid-state reaction Avrami-Erofe'ev equation |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422011851 |
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