Froth flotation is a separation process in which air bubbles are introduced in a water tank to separate the valuable commodities from the valueless material. Based on their relative affinity to water the valuable particles attach to the bubble surface and are carried to the top of the flotation tank to form the froth layer. The resulting froth layer is eventually collected to produce the concentrate. Froth flotation has been used for more than a century in mining operations to separate valuable materials such as rare earth metals from excavated ores. More recently, froth flotation has been employed for the treatment of contaminated water. In the present study, the effect of the particle elongation on the attachment mechanism is investigated in great detail. Using an in-house optical micro-bubble sensor the attachment of micron glass fibres on the surface of a stationary air bubble immersed in stagnant water is investigated. The attachment mechanism is here defined as three successive events: the approach of the particle near the bubble upstream pole, the collision of the solid particle with the gas-liquid interface and the particle sliding on the gas bubble surface. The translational particle velocities together with the particle orientation during entire attachment process are measured and compared with a theoretical model. For the first time the existence of two types of attachment is shown. Upon collision near the upstream pole of the gas bubble the major axis of the fibre aligns with the local bubble surface. If collision occurs at least 30° further downstream the contact is likely to take a punctual form, i.e. the head of the fibre is in contact with the gas-liquid interface.
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ASME/JSME/KSME 2015 Joint Fluids Engineering Conference
July 26–31, 2015
Seoul, South Korea
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5732-8
PROCEEDINGS PAPER
Gravitational Settling of Glass Fibers on an Air Bubble Available to Purchase
Gregory Lecrivain,
Gregory Lecrivain
Kyoto University, Kyoto, Japan
Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
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Giacomo Petrucci,
Giacomo Petrucci
Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
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Uwe Hampel,
Uwe Hampel
Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
Technische Universität Dresden, Dresden, Germany
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Ryoichi Yamamoto
Ryoichi Yamamoto
Kyoto University, Kyoto, Japan
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Gregory Lecrivain
Kyoto University, Kyoto, Japan
Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
Giacomo Petrucci
Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
Uwe Hampel
Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
Technische Universität Dresden, Dresden, Germany
Ryoichi Yamamoto
Kyoto University, Kyoto, Japan
Paper No:
AJKFluids2015-16458, V01AT16A004; 6 pages
Published Online:
April 4, 2016
Citation
Lecrivain, G, Petrucci, G, Hampel, U, & Yamamoto, R. "Gravitational Settling of Glass Fibers on an Air Bubble." Proceedings of the ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. Volume 1A: Symposia, Part 2. Seoul, South Korea. July 26–31, 2015. V01AT16A004. ASME. https://doi.org/10.1115/AJKFluids2015-16458
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