High consistency peroxide bleaching

Details High consistency peroxide bleaching High consistency peroxide bleaching

D - Textiles, Paper

21

B

8/82

D21B 1/16 (2006.01) D21C 9/16 (2006.01) D21D 1/20 (2006.01)

Patent

CA 1281855

ABSTRACT A process is provided for the bleaching of wood pulp with hydrogen or sodium peroxide. The process comprises the steps of adding to a wood pulp a bleach liquor having an effective amount of hydrogen or sodium peroxide bleaching agent and, by weight of the diluted wood pulp, 0.5 to 6% sodium hydroxide, 0 to 5% sodium silicate, 0 to 1%, preferably 0.02 to 0.05%, magnesium sulphate, and a chelating agent in an amount sufficient to sequester heavy metal ions in the pulp, to produce a pulp consistency of 1 to 16% at a temperature in the range of the bleach liquor freezing point to 25°C, uniformly mixing the bleach liquor with the wood pulp, and immediately thickening the diluted wood pulp to a consistency in the range of 20 to 70% for bleaching of the thickened wood pulp. The wood pulp can be subjected to a preliminary treatment by the addition of a chelating agent in an amount sufficient to sequester chelatable heavy metals including manganese at a pulp consistency of 1 to 10%, and dewatering said pulp to a consistency of 20 to 70% to remove the sequestered manganese to less than 10ppm.

545015

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