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| Extrusion die and method |
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| Method of making a high strength catalyst, catalyst support or adsorber |
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| Dialyzed multiple well tissue culture plate |
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| Small dialysis device |
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Flotation method and apparatus
| Details |
Inventors: Hubred, Gale L.; Meekel, William A. C.; Wyslouzil, Harold E.;
Assignee: Cominco Engineering Services Ltd. (Vancouver, CA)
Primary Examiner: Lithgow; Thomas M.
Assistant Examiner:
Attorney, Agent or Firm: de Kock; Elbie R.
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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DETAILED DESCRIPTION According to the invention, there is provided a method of removing finely divided bodies of an insoluble substance dispersed in an aqueous medium from said medium, comprising the steps of causing the aqueous medium to flow upwardly in a column at a velocity in the range of from about 0.
15 to about 2.
5 inch/second (0.
05 to 1 cm/second); generating gas bubbles of a substantially uniform size of less than about 0.
005 inches (0.
1 mm) at the bottom of the column; causing the gas bubbles to rise up in the column in co-current fashion with the flow of said aqueous medium at a velocity in the range of from about 0.
025 to about 2.
5 inches/second (0.
01 to 1 cm/second) in order to contact said bodies of insoluble substance and to capture said bodies and raise them to the surface of the aqueous medium in the column to form a layer of said insoluble substance on the surface of the aqueous medium.
Also according to the invention, there is provided a method of removing finely divided bodies of an insoluble substance dispersed in an aqueous medium, from said medium, comprising the steps of causing said aqueous medium to flow upwardly in a column; generating gas bubbles of a substantially uniform size of less than about 0.
005 inches (0.
1 mm) at the bottom of the column; causing the gas bubbles to rise up in the column in co-current flow with the flow of said aqueous medium to contact said bodies of insoluble substance and to capture said bodies and raise them to the surface of the aqueous medium in the column to form a layer of said insoluble substance on the surface of the aqueous medium, wherein said aqueous medium is exposed to said co-current flow of said gas bubbles for a period of from about 10 to about 30 minutes.
Further according to the invention, there is provided a method of removing finely divided bodies of an insoluble substance dispersed in an aqueous medium, from said medium, comprising the steps of causing said aqueous medium to flow upwardly in a column; generating gas bubbles of a substantially uniform size of less than about 0
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Liquid Purification 
