Bubble Size Distribution Characteristics of a Jet-Stirring Coupling Flotation Device

Minerals

Qiao Dong¹  Jinbo Zhu¹  Xinyue Yang¹  Yunjia Ling¹  Youli Han¹  Shuo Wang¹  Liang Shen¹  Wei Zhou¹ 

[1] School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China;

关键词: flotation;    jet-stirring coupling flotation device;    double cosine self-aspirated nozzle;    suction capacity;    bubble size distribution;   

DOI  :  10.3390/min9060369

来源: DOAJ

【 摘 要 】

In this study, a new jet-stirring coupling flotation device that incorporates the advantages of three conventional flotation machines (specifically, Jameson cell, mechanical flotation cell, flotation column) was designed based on jet suction. The suction capacity of a double cosine self-aspirated nozzle utilized by the device was analyzed under different feeding pressures, and the effects of frother concentration, feeding pressure, suction capacity, and height of sampling location on the bubble size distribution (BSD) were investigated using a high-speed video system. It was found that a large amount of air was sucked into the flotation cell by the self-aspirated nozzle arranged in a non-submerged manner, which met the requirements of flotation in terms of the suction amount of air. The suction capacity showed a positive linear correlation with negative pressure inside the nozzle. When the Methyl isobutyl carbinol (MIBC) concentration reached the critical coalescence concentration (CCC), the bubble size stabilized at approximately 0.31 mm, which was smaller than the bubble size produced by the conventional flotation machine. This indicated that bubbles suitable for flotation were generated. D₃₂ linearly decreased with increasing of feeding pressures and conversely increased with increasing suction capacities and sampling location heights, independent of the frother concentration.

【 授权许可】

Unknown