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

共 50 条

[1] Ultrasonic standing waves on flotation bubbles
Wang, Weidong
Jin, Lizhang
Tu, Yanan
Liu, Dinghua
Xu, Zhiqiang
[J]. Meitan Xuebao/Journal of the China Coal Society, 2021, 46 (09): : 2740 - 2745
[2] AN EFFECT OF ULTRASONIC STANDING WAVES ON ELECTRODEPOSITION
SIMPSON, RJ
[J]. NATURE, 1965, 207 (4993) : 186 - &
[3] Concentration of microparticles and bubbles in standing waves
Ostrovsky, Lev
[J]. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 2015, 138 (06): : 3607 - 3612
[4] Toward efficient interactions of bubbles and coal particles induced by stable cavitation bubbles under 600 kHz ultrasonic standing waves
Chen, Yuran
Ni, Chao
Xie, Guangyuan
Liu, Qingxia
[J]. ULTRASONICS SONOCHEMISTRY, 2020, 64
[5] Positioning of Drops, Particles and Bubbles in Ultrasonic Standing-Waves Levitators. A Final Round Up
Lierke, E. G.
Holitzner, L.
[J]. ACTA ACUSTICA UNITED WITH ACUSTICA, 2013, 99 (02) : 302 - 316
[6] Ultrasonic standing waves in industrial applications
Kristen, M
Doehle, A
Landes, H
Hoffelner, J
Lerch, R
[J]. 2003 IEEE ULTRASONICS SYMPOSIUM PROCEEDINGS, VOLS 1 AND 2, 2003, : 2045 - 2048
[7] Effect of the ultrasonic standing wave frequency on the attractive mineralization for fine coal particle flotation
Chen, Yuran
Chelgani, Saeed Chehreh
Bu, Xiangning
Xie, Guangyuan
[J]. ULTRASONICS SONOCHEMISTRY, 2021, 77
[8] DIRECTIONAL INDEPENDENCE OF FREEZING-IN-EFFECT OF STANDING ULTRASONIC-WAVES
SCHAAFFS, W
HEILAND, B
[J]. ACUSTICA, 1977, 37 (04): : 273 - 276
[9] Trapping of micrometer size bubbles by ultrasonic waves
Yamakoshi, Y
Koshiba, M
Ozawa, Y
Masuda, N
[J]. JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 2001, 40 (3A): : 1526 - 1527
[10] Standing Alfven Waves Within Equatorial Plasma Bubbles
Ghadjari, Hossein
Knudsen, David
Skone, Susan
[J]. GEOPHYSICAL RESEARCH LETTERS, 2022, 49 (07)

← 1 2 3 4 5 →