Enhanced kaolinite flotation using amine coated nanobubbles

Current status of research on nanobubbles in particle flotation

“…The capillary forces mentioned will be discussed in the next section. Through the above discussion of the mechanism of NBS promoting particle collision probability through zeta potential, the following conclusions can be drawn: firstly, due to the phenomenon of charge reversal of the surface zeta potential of NBS under the influence of external factors, thus realizing that the sign of the surface charge is opposite to that of the particles, the electrostatic attraction between each other will be enhanced (González-Tovar and Lozada-Cassou, 2019;Zhang et al, 2019) (this is in line with the idea initially proposed by Han et al (2004) in 2004 proposed to improve particle recovery by adjusting the solution environment so as to form positively charged bubbles, which was also verified by the experimental results of the subsequent researchers); secondly, when NBS that was adsorbed on the particles' surface will also reduce zeta potential's magnitude on the surface of the particles, which will decrease the electrostatic repulsion between the particles and advance the agglomeration between the particles (Michailidi et al, 2020;Kyzas et al, 2021;Zhang et al, 2022). An in-depth understanding of the relationship between NBS and zeta potential will be beneficial for the development of new flotation modulation techniques regarding NBS.…”

“…According to the existing research work, the phenomenon of NBS decreasing the zeta potential of particle surface is not limited to pyrite and graphite, but similar phenomena exist in kaolinite, rutile, and the more hydrophilic muscovite (Fig. 16(b)-(d)) (Wang et al, 2019;Zhou et al, 2019;Zhang et al, 2021c;Zhang et al, 2022). (Zhang et al, 2021c), (c) Changes in zeta potential of white mica under different pH conditions in three liquid environments: ultrapure water (UPW), DDA solution and DDA+NBS solution, respectively.…”