Classifying – separating – and assorting solids – Fluid suspension – Liquid
Reexamination Certificate
2011-08-09
2011-08-09
Lithgow, Thomas M (Department: 1778)
Classifying, separating, and assorting solids
Fluid suspension
Liquid
C209S170000
Reexamination Certificate
active
07992718
ABSTRACT:
The method relates to particle separation from a feed stream. The feed stream is injected directly into the froth zone of a vertical flotation column in the presence of a counter-current reflux stream. A froth breaker generates a reflux stream and a concentrate stream, and the reflux stream is injected into the froth zone to mix with the interstitial liquid between bubbles in the froth zone. Counter-current flow between the plurality of bubbles and the interstitial liquid facilitates the attachment of higher hydrophobicity particles to bubble surfaces as lower hydrophobicity particles detach. The height of the feed stream injection and the reflux ratio may be varied in order to optimize the concentrate or tailing stream recoveries desired based on existing operating conditions.
REFERENCES:
patent: 6413366 (2002-07-01), Kemper
patent: 2006/0021916 (2006-02-01), Hess et al.
Honaker et al, “Selective detachment process in column flotation froth,” Minerals Engineering 19 (2006).
Ata et al, “Collection of hydrophobic particles in the froth phase,” Int. Jour. Miner. Process. 64 (2002).
Schultz et al, “The flotation column as a froth separator,” Mining Engr. 1450 (1991).
Dvorscak Mark P.
Lithgow Thomas M
Lucas John T.
Potts James B.
The United States of America as represented by the United States
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