Abstract
The flotation of droplets in liquids is a frequent phenomenon. For example, flotation is the basis of the removal of liquid nonmetallic inclusions from steel. However, the mechanism of this phenomenon is still poorly understood. The mechanism of flotation of metallic droplets in a melt is comprehensively studied using gold as an example. The kinetics and stages of formation of a gas bubble–attached gold droplet system and the subsequent gold flotation in a melt are investigated. Once a gas bubble and a droplet are in contact, the gold–gas surface and a wetting perimeter are added to the existing slag–gas and gold–slag surfaces. The time is takes for gold droplets about 3 μm in radius to achieve equilibrium is about 10–4 s. Therefore, the formation of an equilibrium bubble–droplet system is fast and does not retard the general process of collection and coarsening of gold droplets by gas bubbles. The flotation condition for the fine (Au, Pt, Pd) droplet–oxide melt system is analyzed. This condition is met for metallic droplets up to 3500 μm in radius.
Similar content being viewed by others
REFERENCES
A. M. Amdur, N. A. Vatolin, S. A. Fedorov, and A. N. Matushkina, “Motion of dispersed gold droplets in porous bodies and oxide melts during heating,” Dokl. Akad. Nauk 465 (3), 307–309 (2015).
V. F. Sazonova and M. K. Kozhemyak, “Flotation mechanism of thin-emulsified fatty acids,” Visnik Odes’kogo Natsional. Univ., Khimiya 16 (13–14) (39–40), 47–53 (2011).
Yu. S. Raizer, M. V. Nazarov, and V. N. Zentsov, “Refining of oily waste water by using electroflotation,” Bashkir. Khim. Zh. 17 (2), 142–148 (2010).
A. A. Abramov, Flotation Beneficiation Methods: A Textbook for Universities (Gornaya Kniga, Moscow, 2008).
S. I. Popel, Surface Phenomena in Melts (Metallurgiya, Moscow, 1994).
V. V. Pavlov, About the “Crisis” in the Kinetic Theory of Liquid and Solidification. Necessary Change in the Traditional Molecular Model of a Liquids and Solids (UGGGA, Yekaterinburg, 1997).
ACKNOWLEDGMENTS
This work was supported by the Russian Foundation for Basic Research, project no. 18-29-24081\18.
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated by K. Shakhlevich
About this article
Cite this article
Vatolin, N.A., Amdur, A.M., Pavlov, V.V. et al. Mechanism of Flotation of Metallic Droplets in Oxide Melts. Russ. Metall. 2019, 97–100 (2019). https://doi.org/10.1134/S0036029519020289
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0036029519020289