期刊
ULTRASONICS SONOCHEMISTRY
卷 73, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2020.105459
关键词
Bubble aggregation; Entrapment and entrainment; Standing waves; Standing waves ultrasonic flotation
资金
- National Natural Science Foundation of China [51974325]
- Fundamental Research Funds for the Central Universities
- China University of Mining & Technology (Beijing)
Ultrasonic flotation is an effective method for floating fine coal by promoting the aggregation of bubbles and coal bubbles. The frequency of standing waves can affect the formation of aggregates and coal recovery rate.
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据