Froth flotation deinking process for paper recycling

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste


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162 5, 209164, 209166, D21C 502




The present invention provides a froth flotation process for the separation of paper and wood fibers from printed and copying inks and other contaminants during the recycling of paper. A liquid solution containing a frothing agent is applied from the top of a froth flotation device, preferably in the form of a spray, to the upper surface or portion of an aqueous pulp slurry present in the device, or of a froth phase produced in the device, prior to or during the froth flotation process.

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Research Proposal No. 4653 Submitted to the U.S. Environmental Protection Agency (EPA) on Jan. 28, 1997, entitled "Wastepaper Deinking by Water Spray Flotation".
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"Recycling Research at IPST", Paper Age (Nov., 1997).
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H. Crow, "The Ten Steps of Deinking," pp. 101-106, Jul. 1987 Tappi Journal (1987).


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