Method and apparatus for improving flotation separation

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United States of America Patent

PATENT NO 5240621
SERIAL NO

07737247

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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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.

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Patent Owner(s)

  • A. AHLSTROM CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Elonen, Jorma Jamsankoski, FI 10 141
Erlund, Harry Espoo, FI 2 16
Henricson, Kaj Kotka, FI 41 241
Immonen, Pasi Savonlinna, FI 4 15
Kohonen, Raimo Savonlinna, FI 13 74
Manninen, Heikki Ummeljoki, FI 17 117
Peltonen, Kari Karhula, FI 18 93
Pitkanen, Raimo Karhula, FI 5 24
Vikio, Pentti Kerimaki, FI 17 71

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