Cfd simulation of bubble-particle collisions in mineral flotation cells

被引:72
作者
Koh, PTL [1 ]
Manickam, M [1 ]
Schwarz, MP [1 ]
机构
[1] CSIRO, Div Minerals, Clayton S, Vic 3169, Australia
关键词
flotation bubbles; flotation machines; froth flotation; modelling; simulation;
D O I
10.1016/S0892-6875(00)00130-8
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The efficiency of the flotation process depends highly on the initial contact between the air bubble and the mineral particle. To enhance this contact, flotation cells are designed to achieve good miring between the suspending solids and the dispersing air. CFD simulation of flotation cells provides an opportunity to analyse the influence of variations in design features and operating conditions on the performance of flotation cells. A laboratory flotation cell designed by CSIRO Minerals and a cylindrical tank fitted with a Rushton turbine used as a flotation machine have been modelled. The impeller and cell geometries have been set lip using multi-blocking and sliding mesh techniques. Complex two-phase flow fields within the cells are predicted. Three-dimensional profiles of the turbulence dissipation rates and volumetric fraction of the air are also obtained. These form the basis for determining the number of bubble-particle collisions per unit time and unit volume. These profiles al-e important for locating positions within flotation cells where the initial contacts between bubbles and particles are made. Collision rates in the CSIRO flotation cell and the stirred tank have been compared. As flotation machines, the CSIRO cell is superior because of the higher maximum collision rate in comparison to the stirred tank. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1455 / 1463
页数:9
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