Abstract
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.
Highlights
Flotation devices are considered to be effective for fine coal slime separation processes [1,2], and the research and development of flotation equipment are focused on achieving a large-scale, high-efficiency, energy-saving, and environmentally friendly separation [3,4]
It was found that due to to the arrangement of double cosine self-aspirated nozzles in a non-submerged manner, a large the arrangement of double cosine self-aspirated nozzles in a non-submerged manner, a large amount amount of air was sucked into the flotation cell, which met the requirements of flotation in terms of of air was sucked into the flotation cell, which met the requirements of flotation in terms of the suction the suction capacity
D32 decreased32with an increasing Methyl isobutyl carbinol (MIBC) concentration until the concentration reached the reached the coalescence concentration (CCC), above which the bubble size stabilized at approximately 0.31 mm, which was smaller
Summary
Flotation devices are considered to be effective for fine coal slime separation processes [1,2], and the research and development of flotation equipment are focused on achieving a large-scale, high-efficiency, energy-saving, and environmentally friendly separation [3,4]. It was found that rotational flow improves the effect of mineralization and increases the recovery of coarse coal particles in the cyclonic-static micro-bubble flotation column [17]. In this study, we developed a new jet-stirring flotation device that combines the advantageous characteristics of the three most common flotation machines These advantages are that the Jameson cell made full use of jet flow to eject a large amount of air and produce smaller size bubbles; the stirring effect of a mechanical flotation cell made the slurry circulation effect better and the flotation was more sufficient; and the rotational flow of cyclonic-static micro-bubble flotation column improved the effect of mineralization and increased the mineral recovery rate. The effects of the feeding pressure, frother concentration, suction capacity, and sampling location height on the bubble size in the flotation cell were investigated via a bubble size measurement system
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