Iron ore pellet drying assisted by microwave: A kinetic evaluation
| Autor: | Maycon Athayde, Bagatini Maurício Covcevich, Maurício Cota Fonseca |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
02 engineering and technology engineering.material Thermal diffusivity 020501 mining & metallurgy law.invention 0404 agricultural biotechnology law Pellet Calcination Moisture Mechanical Engineering Metallurgy 04 agricultural and veterinary sciences General Chemistry Hematite Geotechnical Engineering and Engineering Geology Pelletizing Microstructure 040401 food science 0205 materials engineering Iron ore visual_art visual_art.visual_art_medium engineering Economic Geology |
| Zdroj: | Mineral Processing and Extractive Metallurgy Review. 39:266-275 |
| ISSN: | 1547-7401 0882-7508 |
| Popis: | Drying is a critical process step to achieve excellent pellet quality in pelletizing process. The complexity and energy consumption toward moisture removing, especially for highly hydrated iron ore, increased the need for breakthrough enhancements to this process. The present study has evaluated kinetics parameters of the moisture release from iron ore green pellet using energy transmitted through microwave (frequency of 2.45 GHz). The influence of pellet size and output power on the moisture effective diffusivity (Deff) and the drying activation energy (Ea) were evaluated. The results make possible to compare the cutting-edge approach with traditional convective drying. Pellet physical quality was investigated through the green crushing strength (GCS), which shows smooth reduction in earlier stages, however not affecting the final dry GCS results. Bonded hematite reduction and calcination of goethite was identified at the microstructure through reflected light microscopy, SEM showed micro cracks ... |
| Databáze: | OpenAIRE |
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