矿业科学学报2018，Vol.3Issue(1)：84-90,7.DOI:10.19606/j.cnki.jmst.2018.01.011
超声场中浮选泡沫粒度变化规律研究
Flotation bubble size distribution rules with ultrasonic radiation
摘要
Abstract
By a self-made ultrasonic flotation experimental device and image processing method,flotation micro-bubble size distribution and the relationship between rising velocity and size has been investigated under different ultrasonic frequencies (78 kH、430 kHz、950 kHz) and different air velocities (20 mL /min、30 mL /min、40 mL /min) conditions. Results show that ultrasonic irradiation with a certain frequency can change the diameter of flotation bubble,and promote the aggregates of bubbles,430 kHz ultrasonic can promote bubble size significantly,and the average size of bubble aggregates can increase 80—120 μm. Under ultrasonic field,the second Bjerknes force between bubbles is the major reason for the bubble aggregates,however the aeration velocity has negligible influence on bubble size and bubble coagulation. There is no relationship between the bubbles rising velocity and bubble size, and ultrasonic frequency at the bottom of the floatation unit and the average rising velocity is 15 mm/s. The rising velocity is increasing with the increases of bubbles size at the middle of flotation unit. The average rising velocity reach the peak up to 39. 6 mm/s under 430 kHz ultrasonic field,which is about 20mm/s higher than that under 78 kHz and 950 kHz ultrasonic field.关键词
微泡浮选/超声/粒度分布/上升速率Key words
micro-bubble flotation/ultrasonic/size distribution/rising velocity分类
信息技术与安全科学引用本文复制引用
王卫东,张楠..超声场中浮选泡沫粒度变化规律研究[J].矿业科学学报,2018,3(1):84-90,7.基金项目
国家自然科学基金(51204190,51274208) （51204190,51274208）
