Method and apparatus for improving flotation separation

Liquid purification or separation – Processes – Separating

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210703, 210767, 2102212, 209144, 209211, 554591, 162 4, 162 28, 162 55, 162 63, 4151691, 4151711, 95260, 96200, B01D 2120, B01D 2126

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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.

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