Classifying – separating – and assorting solids – Fluid suspension – Liquid
Reexamination Certificate
2007-06-19
2011-10-18
Lithgow, Thomas M (Department: 1778)
Classifying, separating, and assorting solids
Fluid suspension
Liquid
C209S168000, C209S170000
Reexamination Certificate
active
08038012
ABSTRACT:
A procedure and apparatus for the concentration of hydrophilic materials through flotation which consists of two devices operating in series. The first device performs the function of feeding the gas and the pulp, generate bubbles and produce contact with the hydrophobic particles to be concentrated. The second device performs the functions of separating and evacuating the froth carrying the hydrophobic materials and the evacuation of the aqueous pulp with the materials with water affinity. The gas-pulp mixing device contains inside it solid mixing means, preferably bead shaped and of a density lower than that of the pulp to be processed. The generation of bubbles and their contact with hydrophobic materials happen when the gas and the pulp transit through the interstices between the mixing media which have discrete freedom to move in the interior. The separation of the froth takes place in a tank without motorized agitation systems volume of which can permit the pulp's residence times within a range of 20 to 60 seconds. This tank has in its upper section overflow ridges and froth collecting troughs. The discharge of the tailings is effected through one or more outgoing pipes placed in the inferior section of the slanted bottom and flow of which is controlled by valves. The selectivity of the concentration is controlled by changing the depth at which the bubbler discharges into the froth separator tank.
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Fulbright & Jaworsk, L.L.P.
Lithgow Thomas M
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