Flotation column deinking of paper during recycling

Details Flotation column deinking of paper during recycling Flotation column deinking of paper during recycling

D - Textiles, Paper

21

C

D21C 5/02 (2006.01) B03D 1/02 (2006.01) B03D 1/14 (2006.01) D21C 9/00 (2006.01)

Patent

CA 2044185

17 ABSTRACT Deinking of paper having print during the production of recycled paper is accomplished by using a flotation column. A finely comminuted fibrous suspension having a consistency of about 1-8% is introduced into a first vertical column to flow downwardly. The suspension passes through a sharp-edge orifice and just below the orifice air (substantially atmospheric or pressurized) is sucked into the suspension and entrained in it. This forms a downwardly moving foam bed. The suspension with entrained air passes from the open bottom of the first column into a second column to form a suspension/froth interface in the second column. Ink particles in the suspension attach to the air bubbles and are entrained in the froth. The froth with entrained ink particles is removed from the top of the second column and a suspension substantially free of ink particles is removed from the bottom of the second column, and is preferably deaerated. The sharp edge orifice is preferably circular in configuration with about a 1/2 - 2 inch diameter.

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