Flotation and flocculation chemistry of coal and oxidized coals

Abstract

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Enhancing Fines Recovery by Hybrid Flotation Column and Mixed Collectors

“…However, both approaches are practically difficult to implement on an industrial scale. The former needs selective flocculation of fine particles [17], which is not always possible [18] and the latter needs bubbles sized <50 µm, whose production and industrial use are quite demanding processes [15]. However, on a laboratory scale the use of microbubbles (<100 µm, produced by electroflotation, hydrodynamic cavitation or gas supersaturation) appears to be a relatively more efficient process with selectivity which increases the collision efficiency of fine and ultrafine particles with these bubbles and consequently increase the flotation recovery and rate [19,20].…”

“…Another alternative method to improve fines recovery is by means of using a carrier material [21][22][23] i.e., a material that can selectively collect fine hydrophobic materials so that the relative size of the fines is increased. Flotation recovery can be also increased with the addition of nonionic reagents or other additives to enhance the selective adsorption of the main collector or, finally, through recently technological innovations regarding the design of flotation cells [16][17][18].…”

Effect of microbubbles as flotation carriers on fine sulphide ore beneficiation

“…Hence, Equations (2) and (3) have served as a starting base for the development of several alternative approaches for resolving the issue of fine particle flotation. The first option comprises the use of selective coagulation or flocculation of floated particles and the respective enlargement of the floated objects (Somasundaran 1978). Although this method has found practical applications, it may not be regarded as universal as suitable coagulants and flocculants are not easy and sometimes impossible to find.…”

Influence of Crude Oil Components on Recovery by High and Low Salinity Waterflooding

“…Researchers have also studied the implications of acid/base content on wettability alteration of different surfaces. ,,, Denekas et al selectively removed the acidic and basic compounds from the crude oil and found that the wettability of sandstone was altered by both the acidic and basic components of the crude oil. Somasundaran noted that the quartz surfaces are more sensitive to the basic components in the crude oil. Crude oil with high acid numbers resulted in more water–wet surfaces, while higher base numbers gave more oil–wet behavior. ,, Tweheyo et al .…”