D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/36.8
D21C 11/04 (2006.01) D21C 11/00 (2006.01)
Patent
CA 1286456
Abstract Method for cleaning of green liquor from impurities consisting of solid particles. Caustic lime, corresponding to 0.5-10% of the amount caustic lime necessary for complete causticizing of the green liquor, is added to the green liquor in the soda dissolving tank or in a separate mixing tank to which the liquor is led directly from the dissolving tank. Calcium carbonate precipitates and forms with the impurities particles with considerably better settling- and filtration properties than the particles in green liquor which has not been treated with caustic lime. The method makes it possible to use a considerably higher surface load than hitherto when clarifying the green liquor by settling in conventional green liquor clarifiers. The method also makes it possible to filtrate the green liquor, e.g. in press filters, in place of clarifying it by settling in green liquor clarifiers. The cleaning is much better than by conventional clarifying and consequently a decrease of the losses of degree of reduction during the causticizing process is obtained.
558508
Caustec Aktiebolag
Kirby Eades Gale Baker
Pettersson Bertil
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