- Title
- DEM simulation of particle-bubble capture through extended DLVO theory
- Creator
- Gao, Ya; Evans, Geoffrey M.; Wanless, Erica J.; Moreno-Atanasio, Roberto
- Relation
- Chemeca 2016: Chemical Engineering - Regeneration, Recovery and Reinvention. Proceedings of Chemeca 2016: Chemical Engineering - Regeneration, Recovery and Reinvention (Adelaide, S.A. 25-28 September, 2016) p. 643-653
- Relation
- http://www.chemeca2016.org
- Publisher
- Engineers Australia
- Resource Type
- conference paper
- Date
- 2016
- Description
- This work presents a computational study based on Discrete Element Method (DEM) to study the capture of particles by bubbles. In the DEM model a fully mobile boundary condition was assumed for the gas-liquid (bubble) interface. The forces acting on the particle included density, buoyancy, hydrodynamic — as well as elastic and damping forces if/when the particle penetrates inside the bubble. Surface forces were considered and were evaluated through the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory. A preliminary theoretical analysis of the surface forces were carried out in order to determine the possibility of particle capture. This analysis included the determination of the interaction potential energy, XDLVO V vs. distance curves. Five different behaviours with respect to the interaction potential were found: (1) monotonically increasing, (2) with a primary minimum, (3) with an energy barrier and a primary minimum, (4) monotonically decreasing, and (5) with an energy barrier and second minimum. It was found that the capture of the particle on the bubble surface was strongly dependent on characteristics of the interaction potential curve. For example, a curve with a primary minimum (2) can result in contactless "adhesion”. In the case of XDLVO V with energy barrier, the approaching particle requires sufficient kinetic energy or gravitational force to overcome the energy barrier. Finally, a quantitative analysis of both particle sliding and induction times and collection efficiency under the influence of various types of XDLVO V curves is also presented and discussed in relation to real froth flotation processes.
- Subject
- discrete element method; extended DLVO theory; flotation; hydrophobic force; particle bubble attachment
- Identifier
- http://hdl.handle.net/1959.13/1321904
- Identifier
- uon:24475
- Identifier
- ISBN:9781922107831
- Language
- eng
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