Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1994-02-14
1996-04-23
Alvo, Steven
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 301, 162 37, 162 38, 210712, 210724, 210912, 210919, 210928, D21C 1100
Patent
active
055099998
ABSTRACT:
The removal of bleaching chemical-consuming metals from treatment fluids in a cellulose pulp mill is facilitated by treating the pulp in an acidic or neutral stage to dissolve metals, washing or thickening the pulp to produce a filtrate containing dissolved metals, and then using an alkali liquid to adjust the pH of the filtrate to cause dissolved metals to precipitate. The alkali liquid is pretreated with carbon dioxide to reduce the sulfide content and increase the carbonate content thereof, preferred alkali liquids being green liquor and white liquor. The reduced-metal content filtrate is used in the bleach plant of the pulp mill, to make bleaching chemicals, as a wash liquid, etc. Treatment of the alkali liquid with carbon dioxide is typically practiced by scrubbing the liquor with carbon dioxide gas, for example, using a plate column scrubber or a stationary packing scrubber.
REFERENCES:
patent: 4196043 (1980-04-01), Singh
patent: 5338460 (1994-08-01), Yen
patent: 5348662 (1994-09-01), Yen et al.
patent: 5360514 (1994-11-01), Henricson
patent: 5401362 (1995-03-01), Lindberg
Pp. 371 and 372 of Smook "Handbook for Pulp and Paper Technologists", 1989.
Kubelka, "Absorption and desorption of gases during green liquor carbonation", pp. 269-278.
Saiha, "The adaptability of the Tampella Recovery Process", pp. 635-658.
Nishizawa et al, "Chemical recovery process by direct carbonation of smelt", p. 659 (Abstract).
Alvo Steven
Kamyr Inc.
LandOfFree
Treatment of bleach plant effluents does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Treatment of bleach plant effluents, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Treatment of bleach plant effluents will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2305818