Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1995-02-06
1996-06-25
Lithgow, Thomas M.
Classifying, separating, and assorting solids
Fluid suspension
Liquid
209727, 209730, 209733, 2102212, 162 4, B03D 124, B04C 900, B04C 500
Patent
active
055291902
ABSTRACT:
A slurry of recycled cellulose fibers is deinked by introducing the slurry into the first end of a vortex, sparging gas radially inwardly into the slurry to cause gas bubbles to attach to contaminants and ink particles to form an aerated slurry, discharging the aerated slurry from near the second end of the vortex into a separation vessel, effecting separation of a foam of ink laden gas bubbles from the cellulose fiber slurry in the separation vessel, and removing from the separation vessel the foam with associated ink and contaminants in a first stream, and de-inked cellulose fiber slurry in a second stream. The separation vessel is typically a foam separating vessel with separation effected by flotation, and by discharging the foam. The slurry is introduced into the flotation vessel below the liquid level in it. The slurry typically has a consistency of about 0.5-2%, and the gas to slurry volume ratio during sparging may be 0.1-1 to 1.0 (e.g. 0.2-0.7 to 1, or 0.3-0.4 to 1). The foam separating vessel may be cylindrical with a shower head at the top, and rejects therefrom directed to a rejects tank. Sparging takes place in a hydrocyclone with an outlet that may or may not be restricted; a rejects outlet may extend from a first end of the hydrocyclone to a rejects tank.
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Carlton Keith A.
Clum Scott M.
Doshi Mahendra R.
Funk Erwin D.
Phillips Joseph R.
Ahlstrom Machinery Inc.
Lithgow Thomas M.
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