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In relation to this article, we declare that there is no conflict of interest.
Publication history
Received October 4, 2001
Accepted January 28, 2002
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Effect of Microbubbles and Particle Size on the Particle Collection in the Column Flotation

HydroLab Institute, Sum-Jin EST Company, Songjeong-Dong, Gangseo-Gu, Busan 618-270, Korea 1Department of Mechanical Engineering, Pusan National University, Busan 609-735, Korea
jklee@pusan.ac.kr
Korean Journal of Chemical Engineering, July 2002, 19(4), 703-710(8), 10.1007/BF02699321
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Abstract

Particle-bubble collection characteristics from microbubble behavior in column flotation have been studied theoretically and experimentally. A flotation model taking into account particle collection has been developed by particle-bubble collision followed by the particle sliding over the bubble during which attachment may occur. Bubble size and bubble swarm velocity were measured as a function of frother dosage and superficial gas velocity to estimate the collision and collection efficiency. Separation tests were carried out to compare with theoretical particle recovery. Fly ash particles in the size range of <38, 38-75, 75-125, >125 μm were used as separation test particles. Theoretical collision and collection efficiencies were estimated by experimental data on the bubble behavior such as bubble size, gas holdup and bubble swarm velocity. Collection efficiency improved with an increase of the bubble size and particle size but decreased in the particle size up to 52 μm. Also, flotation rate constants were estimated to predict the optimum separation condition. From the theoretical results on the flotation rate constant, optimum separation condition was estimated as bubble size of 0.3-0.4 mm and superficial gas velocity of 1.5-2.0 cm/s. A decrease of bubble size improved the collection efficiency but did not improve particle recovery.

References

Bando Y, Kuze T, Sugimoto T, Yasuda K, Nakamura M, Korean J. Chem. Eng., 17(5), 597 (2000)
Bergh LG, Yianatos JB, Miner. Eng., 6, 631 (1993) 
Clitf R, Grace JR, Weber ME, "Bubbles, Drops and Particles," Academic Press, N.Y. (1978)
Dobby GS, Finch JA, J. Colloid Interface Sci., 109, 493 (1986) 
Dobby GS, Finch JA, Canadian Metall. Quarterly, 25, 9 (1986)
Finch JA, Dobby GS, "Column Flotation," Pergamon Press, Oxford, England (1990)
Hur JM, Chang D, Chung TH, Korean J. Chem. Eng., 15(6), 596 (1998)
Jiang ZW, Holtham PN, Trans. Instn. Min. Metall., 95, C187 (1986)
Kil JH, Choi JW, Noh KS, Ha BH, HWAHAK KONGHAK, 37(5), 719 (1999)
LeClair BP, Ph.D. Thesis, McMaster University, Hamilton, Ontario (1970)
Lee DH, Epstein N, Grace JR, Korean J. Chem. Eng., 17(6), 684 (2000)
Lee JE, "Separation Characteristics from Fly Ash through the Analysis of Bubble Behavior in the Liquid/Gas Flow Field," Ph.D. Thesis, Pusan National University, Pusan, Korea (1999)
Nam SH, Cho YJ, Kang Y, Choi HS, Kim SD, HWAHAK KONGHAK, 38(6), 859 (2000)
Patel SA, Daly JG, Bukur DB, AIChE J., 36, 93 (1990) 
Reay D, Ratcliff GA, Can. J. Chem. Eng., 51, 178 (1973)
Sutherland KL, J. Phys. Colloid Sci., 52, 394 (1948) 
Tuteja RK, Spottiswood DJ, Misra VN, Miner. Eng., 3, 1359 (1995) 
Uribesalas A, Gomez CO, Finch JA, Chem. Eng. Sci., 49(1), 1 (1994) 
Weber ME, Paddock D, J. Colloid Interface Sci., 94, 328 (1983) 
Woo SW, Ph.D. Thesis, McMaster University, Hamilton, Ontario (1971)
Yamashita F, Korean J. Chem. Eng., 16(6), 789 (1999)
Yianatos JB, Finch JA, Dobby GS, Xu M, J. Colloid Interface Sci., 126, 37 (1988) 
Yoon RH, Miner. Eng., 6, 619 (1993) 
Youn JM, Cho YJ, Kang Y, Kim SD, HWAHAK KONGHAK, 38(6), 864 (2000)
Zhou ZA, Egiebor NO, Plitt LR, Can. Metall. Quarterly, 32, 89 (1993)

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