Collision of a small rising bubble with a large falling particle

被引:18
作者
Hubicka, Martin [1 ]
Basarova, Pavlina [1 ]
Vejrazka, Jiri [2 ]
机构
[1] Prague Inst Chem Technol, Dept Chem Engn, CR-16628 Prague 6, Czech Republic
[2] Acad Sci Czech Republ, Inst Chem Proc Fundamentals, Vvi, CR-16502 Prague 6, Czech Republic
关键词
Bubble-particle interaction; Collision process; Collision efficiency; Force analysis; Flotation; FLOTATION SEPARATION; GAS-BUBBLES; PLASTICS;
D O I
10.1016/j.minpro.2013.02.013
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The attachment of bubbles onto a collecting surface plays a critical role in flotation which is utilised for the separation of mineral ores, coal or plastic materials. While mineral flotation deals with fine particles and larger bubbles, this work is focused on the opposite case of an interaction of a single rising bubble (D-b < I mm) with a larger spherical particle, which falls down through a stagnant liquid. The collision is studied theoretically and experimentally. The theoretical model, based on an analysis of forces acting on the bubble, leads to a differential equation for the bubble motion. Both the mobile and immobile bubble surfaces are considered. The experimental bubble trajectory and velocity evolution are in good agreement with the theoretical model. The horizontal deflection of the bubble trajectory caused by the particle motion is dependent on the ratio of bubble terminal velocity and particle settling velocity. The influence of buoyancy, interception and inertial mechanisms on the collision efficiency is also examined. It is concluded that the buoyancy is the most significant mechanism for the interaction of small bubbles with large particles. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:21 / 30
页数:10
相关论文
共 30 条
[1]   The recovery of plastics from waste with reference to froth flotation [J].
Alter, H .
RESOURCES CONSERVATION AND RECYCLING, 2005, 43 (02) :119-132
[2]   Collision processes involving a single rising bubble and a larger stationary spherical particle [J].
Basarova, P. ;
Machon, V. ;
Hubicka, M. ;
Horn, D. .
INTERNATIONAL JOURNAL OF MINERAL PROCESSING, 2010, 94 (1-2) :58-66
[3]   The inertial hydrodynamic interaction of particles and rising bubbles with mobile surfaces [J].
Dai, ZF ;
Dukhin, S ;
Fornasiero, D ;
Ralston, J .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1998, 197 (02) :275-292
[4]   Particle-bubble collision models - a review [J].
Dai, ZF ;
Fornasiero, D ;
Ralston, J .
ADVANCES IN COLLOID AND INTERFACE SCIENCE, 2000, 85 (2-3) :231-256
[5]   Particle-bubble attachment in mineral flotation [J].
Dai, ZF ;
Fornasiero, D ;
Ralston, J .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1999, 217 (01) :70-76
[6]   Notes on the path and wake of a gas bubble rising in pure water [J].
de Vries, AWG ;
Biesheuvel, A ;
van Wijngaarden, L .
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 2002, 28 (11) :1823-1835
[7]  
Derjaguin B. V., 1961, T I MIN METALL, V70, P221
[8]   Purification of polyethylene terephthalate from polyvinyl chloride by froth flotation for the plastics (soft-drink bottle) recycling industry [J].
Drelich, J ;
Kim, JH ;
Payne, T ;
Miller, JD ;
Kobler, RW .
SEPARATION AND PURIFICATION TECHNOLOGY, 1999, 15 (01) :9-17
[9]   COLLISION EFFICIENCY OF SMALL PARTICLES WITH SPHERICAL AIR BUBBLES [J].
FLINT, LR ;
HOWARTH, WJ .
CHEMICAL ENGINEERING SCIENCE, 1971, 26 (08) :1155-&
[10]   Effect of interface contamination on particle-bubble collision [J].
Huang, Z. ;
Legendre, D. ;
Guiraud, P. .
CHEMICAL ENGINEERING SCIENCE, 2012, 68 (01) :1-18