期刊
MINERALS
卷 11, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/min11060561
关键词
fine particles; combined flotation; bubble size; water electrolysis; micro-bubble generator; magnesite; sodium oleate
资金
- European Union's Horizon 2020 research and innovation program [821265-FineFuture]
Flotation is a crucial separation technique in the mining industry, especially for fine and ultra-fine particles. Combining conventional air bubbles with micro-bubbles from water electrolysis has been found to enhance flotation efficiency, particularly for recovering ultrafine particles. The experimental results on a hybrid flotation device show a 10% increase in fine particle recovery with the addition of micro-bubbles.
Flotation in the mining industry is a very significant separation technique. It is known that fine and ultra-fine particles are difficult to float, leading to losses of valuable minerals, mainly due to their low collision efficiency with bubbles. Flotation of fine particles can be enhanced either by increasing the apparent particle size or by decreasing the bubble size. Literature review reveals that electroflotation resulted in higher recoveries of ultrafine particles as compared with dispersed-air flotation, because electrolytic bubbles are smaller in size. To this end, the best practical approach is to combine conventional air bubbles and micro-bubbles from water electrolysis. Therefore, the design, fabrication, and operation of a bench-scale micro-bubble generator through water electrolysis is proposed. Moreover, this electrolysis unit is adapted in a mechanical Denver-type flotation cell. The resulting hybrid flotation device is capable of producing bubbles within a wide range of diameters. The significance of this process is that micro-bubbles, attached tothe surface of fine particles, facilitate the attachment of conventional-sized bubbles and subsequently increase the flotation recovery of particles. Experimental flotation results so far on the hybrid device indicate the enhancement of fine particle recovery by approximately 10% with the addition of micro-bubbles.
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