INFLUENCE OF CAPILLARY PRESSING IN NANO-BUBBLES ON ITS ADHESION TO PARTICLES AT FOAM FLOTATION. Part 3

There were calculated energetic performances of free bubbles transition А into attached bubbles М, or transition А→М (TAM) on the support plates with different wettability: limiting hydrophilic (Ф), limiting hydrophobic (Г) and with incomplete wettability (Нх), where x – share of support plate surface, covered by monolayer of collecting agents’ molecules. Calculates of TAM with bubbles by diameter (dе) from 2 mm to 20 nm on Ф-, Г- and Нх-support plates showed that change of specific energy (ΔG/V), enclosed in bubble at TAM, depends on magnitude of dе, wettability of support plate and its contact area with bubbles. According to findings of investigations, high capillary pressing (Рc) in nano-bubbles М is conductive to its instantaneous spreading along support plate, therewith magnitude of Рc substantively decreases. Processes of adhesion and spreading are developed as alone process, irreversibly, unilaterally and quickly, in as much as they are not complicated by oncoming processes. As the equatorial diameter and support plate’s wettability are reduced decreasing of G/V approaches a some millions of J/m3. There were described photo micrograms more large bubbles with luminescent non-polar reagent, eliminating event of wetting hysteresis for illustration of practical simultaneous of process behavior of adhesion and spreading of bubbles. This event on the case of nano-bubbles is easily overcomes by means of Рc high value.

1. Мелик-Гайказян В.И., Емельянова Н.П., Юшина Т.И. // Изв. вузов. Цв. металлургия. 2013. № 1. С. 3.

2. Мелик-Гайказян В.И., Емельянова Н.П., Юшина Т.И. // Изв. вузов. Цв. металлургия. 2013. № 3. С. 7.

3. Мелик-Гайказян В.И., Емельянов В.М., Емельянова Н.П. и др. // Изв. вузов. Цв. металлургия. 2011. № 4. С. 3.

4. Мелик-Гайказян В.И., Емельянов В.М., Емельянова Н.П. и др. // Изв. вузов. Цв. металлургия. 2011. № 6. С. 3.

5. Фрумкин А.Н., Городецкая А.В., Кабанов Б.Н., Некрасов Н.И. // Журн. физ. химии. 1932. Т. 3, № 5-6. С. 351.

6. The proceedings of the second international congress of surface activity. London: Butterworth, 1957. Vol. 3. Discussion. P. 187.

7. Leja J., Poling G.W. International mineral processing congress. London, 1960. P. 325.

8. Smolders C.A. Contact angles, wetting and de-wetting of mercury. Netherland: Univ. of Utrecht, 1961.

9. Мелик-Гайказян В.И., Ворончихина В.В. // Электрохимия. 1969. Т. 5, № 4. С. 418.

10. Мелик-Гайказян В.И., Емельянова Н.П. // Изв. вузов. Цв. металлургия. 2007. № 4. С. 4.

11. Сазерленд К.Л., Уорк И.В. Принципы флотации. М.: Цв. металлургия, 1958.

12. Hoover T.J. Concentrating ores by flotation. 3-rd ed. London: The Mining Magazine, 1916.

13. Мелик-Гайказян В.И., Абрамов А.А., Рубинштейн Ю.Б. и др. Методы исследования флотационного процесса. М.: Недра, 1990.

14. Мелик-Гайказян В.И., Емельянова Н.П., Юшина Т.И. Методы решения задач теории и практики флотации. М.: Горная книга, 2013.