Liquid purification or separation – Processes – Separating
Patent
1991-07-29
1993-08-31
Dawson, Robert A.
Liquid purification or separation
Processes
Separating
210703, 210767, 2102212, 209144, 209211, 554591, 162 4, 162 28, 162 55, 162 63, 4151691, 4151711, 95260, 96200, B01D 2120, B01D 2126
Patent
active
052406210
ABSTRACT:
A method of separating an aqueous solids containing suspension includes (a) subjecting a first solids containing suspension to centrifugal forces so as to separate the suspension into a first gas containing flow, a second gas-free flow and a third flow; (b) feeding the third flow into a flotation cell having a bottom; (c) introducing air at the bottom of the flotation cell into the third flow for separating from the third flow a fourth partial flow; (d) withdrawing the air containing third flow after the separation of the fourth partial flow from the flotation cell; and (e) subjecting the third flow to the centrifugal forces of step (a). An apparatus for the separation of gas and lightweight material from a gas and lightweight material containing aqueous solids suspension is also described and includes a centrifugal pump for separating the gas and lightweight material from the solids suspension with a suspension inlet and an outlet for the lightweight material; a flotation cell for separating the lightweight material from a solids suspension; and a circulation loop connecting the outlet of the centrifugal pump, the flotation cell and the suspension inlet of the pump.
REFERENCES:
patent: 4872953 (1989-10-01), Smith
patent: 4921400 (1990-05-01), Niskanen
patent: 4977943 (1990-12-01), Miyabe
patent: 4986903 (1991-01-01), Canzoneri et al.
patent: 5080802 (1992-01-01), Cairo, Jr. et al.
Elonen Jorma
Erlund Harry
Henricson Kaj
Immonen Pasi
Kohonen Raimo
A. Ahlstrom Corporation
Dawson Robert A.
Reifsnyder David
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