A study of coal aggregation by standing-wave ultrasound

被引：39

作者：

Chen, Yuran ^{[1
]}

Xie, Guangyuan ^{[1
]}

Chang, Jing ^{[2
]}

Grundy, James ^{[2
]}

Liu, Qingxia ^{[2
]}

机构：

[1] China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Jiangsu, Peoples R China

[2] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada

来源：

FUEL | 2019年 / 248卷

关键词：

Standing-wave ultrasound; Aggregation; Coal; Flotation; FLOTATION; CAVITATION; BUBBLES;

D O I：

10.1016/j.fuel.2019.03.030

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

080707 [能源环境工程]; 082001 [油气井工程];

摘要：

Recovery of fine coal particles by flotation has always been difficult due to the low collision efficiency between air bubbles and fine coal particles. One method to improve the flotation recovery of fine coal particles is the aggregation of these particles prior to the flotation process. This paper introduces a new method for the aggregation of fine coal particles by utilizing an ultrasonic standing-wave treatment. Under a 200 kHz ultrasonic standing-wave, cavitation bubbles formed on the hydrophobic coal particle surfaces. The bubble-laden coal particles moved to the nodes of the ultrasonic standing wave by the acoustic radiation force if the size of the cavitation bubbles were larger than the resonance radius, resulting in rapid aggregation of the fine coal particles. Micro-flotation results indicated that the flotation rate significantly increased after the ultrasonic standing-wave treatment. This study demonstrated an efficient ultrasonic standing-wave method for improving the flotation rate of fine coal particles without addition of chemicals or collectors.

引用

页码：38 / 46

页数：9

共 41 条

[1]

ROLE OF IMPURITIES IN CAVITATION-THRESHOLD DETERMINATION [J].