Flotation method and apparatus

Details Flotation method and apparatus Flotation method and apparatus

1996-07-24

1998-09-29

Lithgow, Thomas M.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210708, 210744, 2102212, C02F 124

Patent

active

058142282

ABSTRACT:
Flotation apparatus (10) for removing finely divided bodies of an insoluble substance dispersed in an aqueous medium, such as oil and solids dispersed in water, comprises a vertical flotation column (12) having a feed inlet (14) and an outlet (22) for the aqueous medium, a sparging system (16) for generating gas bubbles rising upwardly in the aqueous medium to capture and raise the finely divided bodies of the insoluble substance to the surface of the aqueous medium in the column to form a layer (31) of the insoluble substance on the surface of the aqueous medium, a launder (18) for receiving an overflow of the insoluble substance and an outlet (20) for the insoluble substance in the launder. The apparatus (10) can be used in both countercurrent and co-current fashion. In a particular embodiment, the apparatus includes a mechanism for the intermittent dumping of the layer (31) of insoluble substance from the column (12).

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R. Pal, J. Masliyah; "Oil Recovery from Oil in Water Emulsions Using a Flotation Column", The Canadian Journal of Chemical Engineering, v.68, Dec. 1990.
R. Pal, J. Masliyah; "Flow Characterization of a Flotation Column", The Canadian Journal of chemical Engineering, vol. 67, Dec. 1989.
Article entitled "Fat Removal from Process Waters Of The Fish Meal Industry, A Study of Three Flotation Methods" by Marti et al Environmental Technology, vol. 15, pp. 29-39 (1994).
Article entitled "Oil Recovery from Oil in Water Emulsions Using a Flotation Column" by Rajinder et al; The Canadian Journal of Chemical Engineering, vol. 68, pp. 959-967 (1990).
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