Abstract
Fine bubbles of the size required for many processes such as electroflotation can be generated by electrolysis. A large number of factors such as electrode material, electrode surface/morphological properties, pH and current density affect the gas bubble size distribution. This work is aimed at studies on the effect of interrupted current (pulsed) electrolysis on the generation of gas bubbles. A microcomputer-controlled current source designed to generate the required pulses is described along with typical results obtained with this system. It was observed that a decrease in duty cycle at a given pH and average current density causes an increase in fine sized bubbles and concomitant increase in bubble flux. A mechanism based on local potential gradients is proposed to explain this phenomenon.
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References
P. J. Sides, in ‘Modern aspects of Electrochemistry’ (edited by R. E. White, J. O'.M. Bockris and B. E. Conway) 18, Plenum Press, New York (1986) p. 303.
H. Vogt, in ‘Comprehensive, Treatise on Electrochemistry’, Vol. 6, Plenum Press, New York (1983) p. 445.
N. Ahmed and G. J. Jameson,Int. J. Min. Process. 14 (1985) 195.
A. A. Mamakov, in ‘Modern State and Perspective of Electrolytic Flotation’, Vol.I (edited by V. P. Schtiinsta), Kishinev (1975) pp. 3–66 (in Russian).
G. B. Raju and P. R. Khangaonkar,Int. J. Min. Process. 9 (1982) 133.
H. Ledesma and M. Guzman, in ‘Production and Proceessing of Fine Particles’ (edited by A. J. Plumpton), Canadian Institute of Mining and Metallurgy, Montreal (1988) pp. 195–202.
E. A. Cassell, K. M. Kaufman and E. Matijevic,Water Research 9 (1975) 1017.
A. Coehn,Z. Elektrochem. 29 (1923) 1.
B. N. Kabanov, ‘Electrochemistry of metals and adsorption’, Nauka, Moscow (1966).
B. N. Kabanov and A. N. Frumkin,Z. Phys. Chem. 165 (1933) 539.
B. N. Kabanov and N. I. Vashchenko, Electrocapillary phenomena and wettability of materials,Proceedings Academy of Science USSR, Chemical Series (1936) 735.
A. Coehn and H. Neumann,Z. für Phys. 20 (1923) 54.
A. T. Kuhn,Chemical Processing 20 (1974), June 9–12, July 5–7.
V. I. Klassen and V. A. Moukrosov, ‘An Introduction to The Theory of Flotation’, Butterworths, London (1963) p. 493.
N. P. Brandon, G. H. Kelsall, S. Levine and A. L. Smith,J. Appl. Electrochem. 15 (1985) 485.
D. R. Ketkar, R. Mallikarjunan and S. Venkatachalam,J. Electrochem. Soc. India 37 (1988) 313.
J. P. Glas and J. W. Westwater,Int. J. Heat Mass Transfer 7 (1964) 1427.
N. P. Brandon and G. H. Kelsall,J. Appl. Electrochem. 15 (1985) 475.
P. Sides and J. Tobias,J. Electrochem. Soc. 132 (1985) 583.
R. D. Doherty, ‘Physical Metallurgy Part II’, (edited by R. W. Cahn and P. Haasen), North-Holland, Amsterdam (1963) pp. 967–75.
L. F. Murr, ‘Interfacial Phenomena in Metals and Alloys’, Addison-Wesley, Keading MA (1975) pp. 259–80.
N. P. Brandon, Ph.D. thesis, University of London (1985).
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Khosla, N.K., Venkatachalam, S. & Somasundaran, P. Pulsed electrogeneration of bubbles for electroflotation. J Appl Electrochem 21, 986–990 (1991). https://doi.org/10.1007/BF01077584
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DOI: https://doi.org/10.1007/BF01077584