Influence of magnetite concentrate morphology on oxidation and sintering rates of pellet during induration
This study investigates the influence of the morphology of concentrate on the oxidation and sintering rates of magnetite pellets during induration and its impact on the indurated pellets' quality. Various morphologies of concentrates were obtained by ball milling (BM) and high-pressure grinding...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-09-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S223878542302210X |
| _version_ | 1797646681417711616 |
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| author | Hossein Elahidoost Saeed Sheibani Shahram Raygan Leila Hosseini Ali Dehghani Ahmadabadi Nader Esmaeili |
| author_facet | Hossein Elahidoost Saeed Sheibani Shahram Raygan Leila Hosseini Ali Dehghani Ahmadabadi Nader Esmaeili |
| author_sort | Hossein Elahidoost |
| collection | DOAJ |
| description | This study investigates the influence of the morphology of concentrate on the oxidation and sintering rates of magnetite pellets during induration and its impact on the indurated pellets' quality. Various morphologies of concentrates were obtained by ball milling (BM) and high-pressure grinding rolls (HPGR). Pelletizing and induration processes were carried out at different temperatures and times. After a comparative study of the physical characteristics of concentrate powders, the effect of morphology was evaluated through thermal behavior during induration. The physical, microstructural, and strength properties of pellets were also investigated. The HPGR concentrate had angular and elongated-shaped particles with a broad particle size distribution, while the BM particles had a more rounded morphology, and their size distribution was narrower. Results showed that BM and HPGR magnetite pellets are oxidized between 270 and 950 °C. HPGR pellets oxidize slower than BM pellets. Cold compressive strength (CCS) was increased by induration time, although porosity was reduced. HPGR pellets had less porosity than BM pellets; however, their CCS was significantly higher. For pellets indurated at 1200 °C, the difference in CCS between HPGR and BM pellets increased with an increment in the induration time and reached 80 kg/pellet in 20 min. The microstructural analysis took place on the concentrate powder and pellets fracture surface. It was found that HPGR powder sinters faster than BM powder due to its angular shape and broad particle size distribution. |
| first_indexed | 2024-03-11T15:05:10Z |
| format | Article |
| id | doaj.art-d1dada9f0ab349e5a062a7cf5aa044b6 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-11T15:05:10Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-d1dada9f0ab349e5a062a7cf5aa044b62023-10-30T06:04:32ZengElsevierJournal of Materials Research and Technology2238-78542023-09-012671167126Influence of magnetite concentrate morphology on oxidation and sintering rates of pellet during indurationHossein Elahidoost0Saeed Sheibani1Shahram Raygan2Leila Hosseini3Ali Dehghani Ahmadabadi4Nader Esmaeili5School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, IranSchool of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran; Corresponding author. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran.School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, IranFakoor Sanat Tehran Engineering Company, Tehran, IranFakoor Sanat Tehran Engineering Company, Tehran, IranFakoor Sanat Tehran Engineering Company, Tehran, IranThis study investigates the influence of the morphology of concentrate on the oxidation and sintering rates of magnetite pellets during induration and its impact on the indurated pellets' quality. Various morphologies of concentrates were obtained by ball milling (BM) and high-pressure grinding rolls (HPGR). Pelletizing and induration processes were carried out at different temperatures and times. After a comparative study of the physical characteristics of concentrate powders, the effect of morphology was evaluated through thermal behavior during induration. The physical, microstructural, and strength properties of pellets were also investigated. The HPGR concentrate had angular and elongated-shaped particles with a broad particle size distribution, while the BM particles had a more rounded morphology, and their size distribution was narrower. Results showed that BM and HPGR magnetite pellets are oxidized between 270 and 950 °C. HPGR pellets oxidize slower than BM pellets. Cold compressive strength (CCS) was increased by induration time, although porosity was reduced. HPGR pellets had less porosity than BM pellets; however, their CCS was significantly higher. For pellets indurated at 1200 °C, the difference in CCS between HPGR and BM pellets increased with an increment in the induration time and reached 80 kg/pellet in 20 min. The microstructural analysis took place on the concentrate powder and pellets fracture surface. It was found that HPGR powder sinters faster than BM powder due to its angular shape and broad particle size distribution.http://www.sciencedirect.com/science/article/pii/S223878542302210XPelletIndurationMorphologyMagnetite concentrateSintering |
| spellingShingle | Hossein Elahidoost Saeed Sheibani Shahram Raygan Leila Hosseini Ali Dehghani Ahmadabadi Nader Esmaeili Influence of magnetite concentrate morphology on oxidation and sintering rates of pellet during induration Journal of Materials Research and Technology Pellet Induration Morphology Magnetite concentrate Sintering |
| title | Influence of magnetite concentrate morphology on oxidation and sintering rates of pellet during induration |
| title_full | Influence of magnetite concentrate morphology on oxidation and sintering rates of pellet during induration |
| title_fullStr | Influence of magnetite concentrate morphology on oxidation and sintering rates of pellet during induration |
| title_full_unstemmed | Influence of magnetite concentrate morphology on oxidation and sintering rates of pellet during induration |
| title_short | Influence of magnetite concentrate morphology on oxidation and sintering rates of pellet during induration |
| title_sort | influence of magnetite concentrate morphology on oxidation and sintering rates of pellet during induration |
| topic | Pellet Induration Morphology Magnetite concentrate Sintering |
| url | http://www.sciencedirect.com/science/article/pii/S223878542302210X |
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