Investigation of bubble-particle attachment, detachment and collection efficiencies in a mechanical flotation cell

被引：40

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：

POWDER TECHNOLOGY | 2020年 / 375卷

关键词：

Mechanical flotation; Turbulence; Bubble-particle attachment efficiency; Bubble-particle detachment efficiency; Bubble-particle collection efficiency; AIR BUBBLES; COLLISION EFFICIENCY; SIZE; KINETICS; SURFACE; MODELS; RATES; FLOW;

D O I：

10.1016/j.powtec.2020.07.085

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The paper presents the effect of impeller speed and superficial gas velocity on bubble-particle attachment, detachment and collection efficiencies using pure quartz particles in a mechanical flotation cell. Detachment and collection efficiencies in different parts of cell were calculated by local turbulent energy dissipation rate measurements using high speed stereoscopic particle image velocimetry technique. In addition to high detachment efficiency, low attachment efficiency is also one of the reasons for low collection efficiency for coarse particles. The flotation rate constant increased with an increase in superficial gas velocity. However, the effect of superficial gas velocity on collection efficiency was negligible. This means that any effect of superficial gas velocity on flotation rate constant was due to changes in the number of bubbles and collision frequency. The flotation rate constant, collision frequency, and the number of bubbles increased with increasing impeller speed. However, collection efficiency decreased with increasing impeller speed. (C) 2020 Elsevier B.V. All rights reserved.

引用

页码：109 / 123

页数：15