Solids and gas contents in flotation aggregates as determined from differences between velocities of the aggregates and empty bubbles

• Autorzy: Małysa K. , Ng S. , Warszyński P.
• Języki publikacji: EN

Abstrakty

EN

A methodology for characterizing the phase composition of aggregates floating inside an industrial separation cell (based on the Luba Tube Sampling Technique, LTST) is presented. The LTST enables observation and recording of phenomena occurring inside a processing vessel by guiding a flux of floating aggregates into the tube, and monitoring them above the edge of the separation vessel. Aggregate sizes and positions are determined on sequences of video images. Rise velocities of aggregates are determined by measuring the displacements of their positions between the consecutive frames. Rising velocity of the empty bubbles and air-bitumen aggregates were determined in the separation cell. Contents of air and of solids in the floating aggregates are calculated from differences between their velocities and velocities of unloaded bubbles of the same size. As an example, the contents of bitumen-air aggregates obtained during processing of a selected oilsand were evaluated. It was found that the average aggregate had a diameter of 0.32š0.20 mm and contained approximately 2.2*10(-5) g of bitumen.

Słowa kluczowe

EN

flotation; aggregate velocity; bubble-grain aggregates; phase composition

PL

flotacja; prędkość agregatów; skład fazowy

• Wydawca: Centrum Upowszechniania Nauki PAN
• Czasopismo: Bulletin of the Polish Academy of Sciences. Chemistry
• Rocznik: 2003
• Tom: Vol. 51, No. 2
• Strony: 115--126
• Opis fizyczny: Bibliogr. 8 poz.

Twórcy

autor

Małysa K.

• Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek, 30-059 Cracow, Poland (Instytut Katalizy i Fizykochemii Powierzchni PAN)

autor

Ng S.

• Syncrude Research Center, Edmonton, Canada

autor

Warszyński P.

• Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek, 30-059 Cracow, Poland (Instytut Katalizy i Fizykochemii Powierzchni PAN)

Bibliografia

• [1] J. Leja, Surface Chemistry of Froth Flotation, Plenum Press, New York - London 1982.
• [2] J. Laskowski, Frothers and Frothing, in: Frothing in Flotation II, eds.: J. S. Laskowski and E. T. Woodburn, Gordon and Breach Science Publishers, 1998, pp. 1-49.
• [3] K. Małysa, S. Ng, L. Cymbalisty, J. Czarnecki, J. Masliyah, A Method of Visualization and Characterization of Aggregates Flow Inside a Separation Vessel. I. Size, Shape and Rise Velocity of the Aggregates, International J. Mineral Processing, 55 (1999) 171.
• [4] S. Ng, P. Warszyński, M. Zembala, K. Małysa, Flow of flotation aggregates to froth layer: I. Method of analysis, Minerals Engineering, 13 [14-15] (2000) 1505.
• [5] E. Chen, C. O. Gomez, J. A. Finch, Bubble size measurement in flotation machines, Minerals Engineering, 14 [4] (2001) 427.
• [6] L. Landau, E. Lifszyc, Hydrodynamika, Polish edn., PWN, Warszawa 1992.
• [7] R. Clift, J. R. Grace, M. E. Weber, Bubbles, Drops and Particles, Academic Press, New York - San Francisco - London 1978, p. 221.
• [8] M. Krzan, K. Malysa, Profiles of local velocities of bubbles in n-butamol, n-hexanol and n-nonanol solutions, Colloids & Surfaces A:, 207 (2002) 279.