Processing fine powders by roll press
| Autor: | Daniel Heitzmann, Vivien Esnault, Abderrahim Michrafy, Driss Oulahna, Mohamed Michrafy |
|---|---|
| Přispěvatelé: | Ctr Rech Lafarge, Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement ( RAPSODEE ), Centre National de la Recherche Scientifique ( CNRS ) -IMT École nationale supérieure des Mines d'Albi-Carmaux ( IMT Mines Albi ), Bordeaux Management School (BEM), Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement (RAPSODEE), Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT) |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Bentonite powder
Materials science General Chemical Engineering Metallurgy Compaction Modeling 02 engineering and technology Material density Physics::Classical Physics 021001 nanoscience & nanotechnology Gas pressure Physics::Fluid Dynamics Permeability (earth sciences) [SPI]Engineering Sciences [physics] 020303 mechanical engineering & transports Roll compaction 0203 mechanical engineering [ SPI ] Engineering Sciences [physics] Particle size Composite material Fine powders 0210 nano-technology Porosity Rolling speed |
| Zdroj: | Powder Technology Powder Technology, Elsevier, 2015, 270 (Part B, SI), p. 484-489. 〈http://www.sciencedirect.com/science/article/pii/S0032591014006962〉. 〈10.1016/j.powtec.2014.07.046〉 Powder Technology, Elsevier, 2015, 270 (Part B, SI), p. 484-489. ⟨10.1016/j.powtec.2014.07.046⟩ |
| ISSN: | 0032-5910 |
| DOI: | 10.1016/j.powtec.2014.07.046〉 |
| Popis: | International audience; The gas trapped into fine powders causes specific problems like feeding disturbances during roll compaction process. In this study, the gas flow and its effect on the rolling process are numerically investigated in the rolling direction, using Darcy's law and assuming the permeability as a function of both material density and particle size through Carman-Kozeny relationship. The solid properties evolution is based on the Johanson model, whereas the solid speed is determined from the conservation of the material mass. Computational results of solid properties and gas pressure distribution are presented by considering bentonite powder properties. According to material and process parameters, especially rolling speed and powder permeability, we discuss conditions for the escape of gas through the porous material during the process and stability conditions of the feeding at the rolls' entry. Beyond the simplicity of the model (1D), it allows for a better understanding of fine powders processing by roll press. It highlights the combined effect of the permeability of the powder and the rotating speed on the gas pressure, during roll compaction process. (C) 2014 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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