Production of Hematite Micro- and Nanoparticles in a Fluidized Bed Process—Mechanism Study
A continuous, compact and simple process was developed to synthesize micro- and nanoparticles of iron oxide. The process combines the spraying (pulverization) of an aqueous solution of iron nitrate in a fluidized bed reactor containing coarse and hot glass beads (T = 200 °C) for the production of so...
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| Format: | Article |
| Language: | English |
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Hosokawa Powder Technology Foundation
2019-09-01
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| Series: | KONA Powder and Particle Journal |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/kona/37/0/37_2020014/_html/-char/en |
| _version_ | 1818591711184551936 |
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| author | Nadine Le Bolay Rihab Lakhal Mehrdji Hemati |
| author_facet | Nadine Le Bolay Rihab Lakhal Mehrdji Hemati |
| author_sort | Nadine Le Bolay |
| collection | DOAJ |
| description | A continuous, compact and simple process was developed to synthesize micro- and nanoparticles of iron oxide. The process combines the spraying (pulverization) of an aqueous solution of iron nitrate in a fluidized bed reactor containing coarse and hot glass beads (T = 200 °C) for the production of solids and a transported bed reactor for calcination (T = 490 °C). The intermediate product formed in the fluidized bed reactor is 2-line ferrihydrite, while the calcination reactor allows the production of hematite micro- and nanoparticles. These particles are characterized by a narrow size distribution, a mean size of 0.5 μm, a specific surface area of 24 m2 g−1 and a density of 4499 kg m−3. Particles are made up of small clusters of crystallites having an average size of 47 nm and a low internal porosity (0.12). The reaction mechanism was studied using a muffle furnace and a lab convective dryer. It was found that several steps are involved leading first to the production of iron nitrate dihydrate after the removal of the solution water, as well as two and then five molecules of water of hydration. After that, the elimination of nitrate leads to the production of ferrihydrite. Finally, ferrihydrite is transformed into hematite due to the removal of residual nitrate and water of hydroxylation. |
| first_indexed | 2024-12-16T10:16:46Z |
| format | Article |
| id | doaj.art-c860d2825c5b4e0893287e711eab91a7 |
| institution | Directory Open Access Journal |
| issn | 0288-4534 2187-5537 |
| language | English |
| last_indexed | 2024-12-16T10:16:46Z |
| publishDate | 2019-09-01 |
| publisher | Hosokawa Powder Technology Foundation |
| record_format | Article |
| series | KONA Powder and Particle Journal |
| spelling | doaj.art-c860d2825c5b4e0893287e711eab91a72022-12-21T22:35:25ZengHosokawa Powder Technology FoundationKONA Powder and Particle Journal0288-45342187-55372019-09-0137024425710.14356/kona.2020014konaProduction of Hematite Micro- and Nanoparticles in a Fluidized Bed Process—Mechanism StudyNadine Le Bolay0Rihab Lakhal1Mehrdji Hemati2University of Toulouse, FranceUniversity of Toulouse, FranceUniversity of Toulouse, FranceA continuous, compact and simple process was developed to synthesize micro- and nanoparticles of iron oxide. The process combines the spraying (pulverization) of an aqueous solution of iron nitrate in a fluidized bed reactor containing coarse and hot glass beads (T = 200 °C) for the production of solids and a transported bed reactor for calcination (T = 490 °C). The intermediate product formed in the fluidized bed reactor is 2-line ferrihydrite, while the calcination reactor allows the production of hematite micro- and nanoparticles. These particles are characterized by a narrow size distribution, a mean size of 0.5 μm, a specific surface area of 24 m2 g−1 and a density of 4499 kg m−3. Particles are made up of small clusters of crystallites having an average size of 47 nm and a low internal porosity (0.12). The reaction mechanism was studied using a muffle furnace and a lab convective dryer. It was found that several steps are involved leading first to the production of iron nitrate dihydrate after the removal of the solution water, as well as two and then five molecules of water of hydration. After that, the elimination of nitrate leads to the production of ferrihydrite. Finally, ferrihydrite is transformed into hematite due to the removal of residual nitrate and water of hydroxylation.https://www.jstage.jst.go.jp/article/kona/37/0/37_2020014/_html/-char/enhematite nanoparticlesferrihydritefluidized bedpropertiesmechanisms |
| spellingShingle | Nadine Le Bolay Rihab Lakhal Mehrdji Hemati Production of Hematite Micro- and Nanoparticles in a Fluidized Bed Process—Mechanism Study KONA Powder and Particle Journal hematite nanoparticles ferrihydrite fluidized bed properties mechanisms |
| title | Production of Hematite Micro- and Nanoparticles in a Fluidized Bed Process—Mechanism Study |
| title_full | Production of Hematite Micro- and Nanoparticles in a Fluidized Bed Process—Mechanism Study |
| title_fullStr | Production of Hematite Micro- and Nanoparticles in a Fluidized Bed Process—Mechanism Study |
| title_full_unstemmed | Production of Hematite Micro- and Nanoparticles in a Fluidized Bed Process—Mechanism Study |
| title_short | Production of Hematite Micro- and Nanoparticles in a Fluidized Bed Process—Mechanism Study |
| title_sort | production of hematite micro and nanoparticles in a fluidized bed process mechanism study |
| topic | hematite nanoparticles ferrihydrite fluidized bed properties mechanisms |
| url | https://www.jstage.jst.go.jp/article/kona/37/0/37_2020014/_html/-char/en |
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