Effect of ultrasonic standing waves on flotation bubbles

被引：18

作者：

Jin, Lizhang ^{[1
]}

Wang, Weidong ^{[1
]}

Tu, Yanan ^{[1
]}

Zhang, Kanghui ^{[1
]}

Lv, Ziqi ^{[1
]}

机构：

[1] China Univ Min & Technol Beijing, Sch Chem & Environm Engn, Beijing 100083, Peoples R China

来源：

ULTRASONICS SONOCHEMISTRY | 2021年 / 73卷

基金：

中国国家自然科学基金;

关键词：

Bubble aggregation; Entrapment and entrainment; Standing waves; Standing waves ultrasonic flotation; ENHANCED DESULFURIZING FLOTATION; HIGH-SULFUR COAL; TRUE FLOTATION; FINE; SONOLUMINESCENCE; EMULSIFICATION; ENTRAINMENT; PARTICLES; LIGNITE;

D O I：

10.1016/j.ultsonch.2020.105459

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

Ultrasonic flotation was an effective method to float fine coal. In this study, the effects of the standing waves with different frequencies on ultrasonic flotation were investigated. The dynamic processes of bubble and coal-bubble were revealed by a high-speed camera. The results showed that under the action of Bjerknes force, bubble aggregates were formed within 450 ms and coal bubble aggregates were formed within 20 ms. The bubble aggregates were statistically analyzed by image processing method. The number of aggregates and small bubbles in the ultrasonic field at 100 kHz was greater than those at 80 and 120 kHz. Besides, 100 kHz ultrasonic flotation achieved the highest yields of clean coal (35.89%) and combustible recovery (45.77%). The cavitation bubbles acted as either a ?medium? or an ?inclusion?, entrapping and entraining the coal particles in the flotation pulp. It promoted the aggregation of bubbles with coal particles, so the flotation efficiency was effectively improved in the presence of ultrasonic standing waves.

引用

页数：11

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