Investigation of bubble-particle interactions in a mechanical flotation cell, part 1: Collision frequencies and efficiencies

被引：23

作者：

Darabi, Hossna ^{[1
]}

Koleini, S. M. Javad ^{[1
]}

Deglon, David ^{[2
]}

Rezai, Bahram ^{[3
]}

Abdollahy, Mahmoud ^{[1
]}

机构：

[1] Tarbiat Modares Univ, Dept Mineral Proc, Tehran 1411511, Iran

[2] Univ Cape Town, Dept Chem Engn, Mineral Proc Res Unit, ZA-7700 Cape Town, South Africa

[3] Amirkabir Univ Technol, Dept Min & Met Engn, Tehran 1591634311, Iran

来源：

MINERALS ENGINEERING | 2019年 / 134卷

关键词：

Mechanical flotation; Turbulent kinetics energy dissipation; Bubble-particle collision frequency; Bubble-particle collision efficiency; GAS DISPERSION; TURBULENCE; HYDRODYNAMICS; SIZE; SURFACE; RATES;

D O I：

10.1016/j.mineng.2019.01.012

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

In this study the influence of impeller speed and superficial gas velocity on hydrodynamic parameters, bubble-particle collision frequency and efficiency using pure quartz particles of different sizes in an aerated Denver flotation cell was investigated. Collision frequency in different parts of cell was calculated by local turbulent energy dissipation rate measurements. Collision efficiency due to gravitational, inertial, interceptional and turbulence mechanism was determined. The overall collision efficiency (E-c) was also investigated. The results showed that the bubble-particle frequencies for different particle sizes in the turbulent zone were 10-12 times higher than in the quiescent zone. Under various hydrodynamic conditions, minimum and maximum values of E-c were observed for - 38 gm and - 300 + 212 mu m particles, respectively. The turbulence mechanism was the main collision mechanism for fine particles. The collision efficiency of coarse particles was mainly influenced by gravitational, inertial and interceptional mechanisms.

引用

页码：54 / 64

页数：11