Investigation of bubble-particle attachment, detachment and collection efficiencies in a mechanical flotation cell
| Autor: | S.M. Javad Koleini, D.A. Deglon, Hossna Darabi, Bahram Rezai, Mahmoud Abdollahy |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Gas velocity General Chemical Engineering Bubble 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Stereoscopic particle image velocimetry Physics::Fluid Dynamics Impeller Reaction rate constant 020401 chemical engineering Collision frequency Particle 0204 chemical engineering 0210 nano-technology Quartz |
| Zdroj: | Powder Technology. 375:109-123 |
| ISSN: | 0032-5910 |
| DOI: | 10.1016/j.powtec.2020.07.085 |
| Popis: | The paper presents the effect of impeller speed and superficial gas velocity on bubble-particle attachment, detachment and collection efficiencies using pure quartz particles in a mechanical flotation cell. Detachment and collection efficiencies in different parts of cell were calculated by local turbulent energy dissipation rate measurements using high speed stereoscopic particle image velocimetry technique. In addition to high detachment efficiency, low attachment efficiency is also one of the reasons for low collection efficiency for coarse particles. The flotation rate constant increased with an increase in superficial gas velocity. However, the effect of superficial gas velocity on collection efficiency was negligible. This means that any effect of superficial gas velocity on flotation rate constant was due to changes in the number of bubbles and collision frequency. The flotation rate constant, collision frequency, and the number of bubbles increased with increasing impeller speed. However, collection efficiency decreased with increasing impeller speed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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