Investigation of nanobubble enhanced reverse anionic flotation of hematite and associated mechanisms

Nanobubble assisted flotation separation of complex Pb–Cu–Zn sulfide ore – Assessment of process readiness

“…[17,18] The flotation rate constant k, for each scenario, was calculated using the firstorder equation 2. [5] Pure quartz (Single) -−100 + 48 µm 23% mass recovery [6] Pure quartz (Single) MIBC −425 + 106 µm +5-20% mass recovery [7] Pure quartz (Single) A65 −425 + 106 µm + 15-20% mass recovery [7] Apatitic ore -−75 µm +8.9% recovery, −1.9% grade [6] Phosphate ore Flo-Y-S −38 µm +35.4% recovery, +3.4% grade [8] Hematite ore TD-II −150 µm +16.0% recovery, -grade [9]…”

“…The essential outcome was that NB flotation could improve the recovery of ultrafine, and in some cases, coarse particles (Table 1) . [3,6,[9][10][11][12][13][14] It was recently also illustrated that NB generation in the presence of conventional flotation reagents, besides improvement in the flotation recovery, could reduce the overall chemical consumption through the process [15] (Table 1). However, these investigations mostly assessed NB flotation's effect on a narrow size range (ultrafine or coarse range).…”

Synergistic Effect of DBP with CTAB on Flotation Separation of Quartz from Collophane

“…Chen et al [29] showed that the addition of α-terpineol further reduced surface tension compared to the salicylhydroxamic acid or methyl isobutyl carbinol system and resulted in an additional reduction in bubble size. Sobhy et al [12] and Tao and Sobhy [13] demonstrated that the bubble diameter had a significant impact on the bubble-particle collision and attachment efficiency and that the collision efficiency increased with decreasing bubble diameter. This flotation improvement mechanism is particularly important for fine and ultrafine quartz particles for which the collision efficiency is the flotation rate determining parameter.…”

“…The collection probability of mineral particles by bubbles is dependent on many factors in the flotation process, particularly the particle size, hydrophobicity, and bubble size, etc. [13]. Ma et al [33] investigated nanobubble enhanced column flotation of Chinese sub-bituminous coal and concluded that enhancing mineral surface hydrophobicity and increasing apparent particle size were effective ways to improve the collection probability.…”

“…Vieira and Peres [11] investigated the effect of particle size on the floatability of quartz using dodecylamine as collector and concluded that the quartz flotation recovery decreased sharply with the decrease of particle size. Sobhy et al [12] and Tao and Sobhy [13] proved that the main reason why gangue minerals are not effectively removed in desilication of hematite by reverse flotation is the low collision probability between fine quartz particles and conventional bubbles. In addition, Wu and Tao [14] studied the process mineralogy of collophane from Yunnan, China and its desilication difficulties by double reverse flotation.…”