Mechanism of iron grains aggregation and growth in metalized pellet under the alternating magnetic fields
The direct reduction-magnetic separation method is highly efficient for producing metallic iron powder from low-grade complex ore resources. However, the limitation lies in the small average size of iron grains, which impedes the subsequent separation between metallic iron and gangue minerals. To ad...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-03-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424004150 |
| _version_ | 1797247823106801664 |
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| author | Yufeng Guo Yu Zheng Shuai Wang Fuchun Xu Feng Chen Hao Li Yuqiao Ren Yuekai Wen Lingzhi Yang |
| author_facet | Yufeng Guo Yu Zheng Shuai Wang Fuchun Xu Feng Chen Hao Li Yuqiao Ren Yuekai Wen Lingzhi Yang |
| author_sort | Yufeng Guo |
| collection | DOAJ |
| description | The direct reduction-magnetic separation method is highly efficient for producing metallic iron powder from low-grade complex ore resources. However, the limitation lies in the small average size of iron grains, which impedes the subsequent separation between metallic iron and gangue minerals. To address this, a novel method utilizing induction heating was introduced to stimulate the aggregation and growth of iron grains. Our study systematically investigated the growth kinetics behavior of iron grains under alternating magnetic fields. Additionally, we compared the impact of induction heating versus conventional heating on iron grain growth and delved into the mechanism through which the magnetic effect enhances the aggregation and migration of iron grains. The results indicate that iron grains can effectively aggregate and migrate to the edges of cracks or pellet surface under alternating magnetic fields, realizing the increase of average iron grain size and the pre-separation of metallic iron from gangue minerals. Specifically, the average iron grain size increased from 12.95 μm to 36.58 μm when induction heating temperature at 1300 °C for 100 min. Additionally, the total iron grade of concentrate reached 94.60% with ball milling 30 min and magnetic field intensity of 750 Gs. Finally, the growth model of iron grains under alternating magnetic fields was established and the mechanism of magnetic effect on promoting iron grains growth was revealed. |
| first_indexed | 2024-03-07T23:06:22Z |
| format | Article |
| id | doaj.art-aff4ff0f7614429dbb19ca75fa6f93fb |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-24T20:04:49Z |
| publishDate | 2024-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-aff4ff0f7614429dbb19ca75fa6f93fb2024-03-24T06:58:24ZengElsevierJournal of Materials Research and Technology2238-78542024-03-012937263737Mechanism of iron grains aggregation and growth in metalized pellet under the alternating magnetic fieldsYufeng Guo0Yu Zheng1Shuai Wang2Fuchun Xu3Feng Chen4Hao Li5Yuqiao Ren6Yuekai Wen7Lingzhi Yang8School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, ChinaCorresponding author.; School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, ChinaCorresponding author.; School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, ChinaThe direct reduction-magnetic separation method is highly efficient for producing metallic iron powder from low-grade complex ore resources. However, the limitation lies in the small average size of iron grains, which impedes the subsequent separation between metallic iron and gangue minerals. To address this, a novel method utilizing induction heating was introduced to stimulate the aggregation and growth of iron grains. Our study systematically investigated the growth kinetics behavior of iron grains under alternating magnetic fields. Additionally, we compared the impact of induction heating versus conventional heating on iron grain growth and delved into the mechanism through which the magnetic effect enhances the aggregation and migration of iron grains. The results indicate that iron grains can effectively aggregate and migrate to the edges of cracks or pellet surface under alternating magnetic fields, realizing the increase of average iron grain size and the pre-separation of metallic iron from gangue minerals. Specifically, the average iron grain size increased from 12.95 μm to 36.58 μm when induction heating temperature at 1300 °C for 100 min. Additionally, the total iron grade of concentrate reached 94.60% with ball milling 30 min and magnetic field intensity of 750 Gs. Finally, the growth model of iron grains under alternating magnetic fields was established and the mechanism of magnetic effect on promoting iron grains growth was revealed.http://www.sciencedirect.com/science/article/pii/S2238785424004150Induction heatingIron grain growthGranularity characteristicGrowth kineticsMagnetic effect |
| spellingShingle | Yufeng Guo Yu Zheng Shuai Wang Fuchun Xu Feng Chen Hao Li Yuqiao Ren Yuekai Wen Lingzhi Yang Mechanism of iron grains aggregation and growth in metalized pellet under the alternating magnetic fields Journal of Materials Research and Technology Induction heating Iron grain growth Granularity characteristic Growth kinetics Magnetic effect |
| title | Mechanism of iron grains aggregation and growth in metalized pellet under the alternating magnetic fields |
| title_full | Mechanism of iron grains aggregation and growth in metalized pellet under the alternating magnetic fields |
| title_fullStr | Mechanism of iron grains aggregation and growth in metalized pellet under the alternating magnetic fields |
| title_full_unstemmed | Mechanism of iron grains aggregation and growth in metalized pellet under the alternating magnetic fields |
| title_short | Mechanism of iron grains aggregation and growth in metalized pellet under the alternating magnetic fields |
| title_sort | mechanism of iron grains aggregation and growth in metalized pellet under the alternating magnetic fields |
| topic | Induction heating Iron grain growth Granularity characteristic Growth kinetics Magnetic effect |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424004150 |
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