Descaling by regulating ph and salt concentration

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 9/10 (2006.01) D21C 9/00 (2006.01) D21C 9/147 (2006.01) D21C 9/153 (2006.01) D21C 11/00 (2006.01)

Patent

CA 2173215

A method for reducing or eliminating the formation of salt scale upon process equipment caused by precipitation of insoluble salts during the bleaching of pulp. The pulp is subjected to a bleaching sequence which includes a plurality of pulp treatment steps, wherein at least one pulp treatment step is conducted under alkaline conditions and at least one pulp treatment step is conducted under acidic conditions. A filtrate stream which contains dissolved insoluble salts therein is thus generated, and at least a portion of the filtrate stream (56) is combined with an alkaline stream (205, 210, 215, 220, 225) and pulp to cause the salts to associate with the pulp, thus removing the salts from the filtrate stream to reduce or eliminate the formation of salt scale upon process equipment during the bleaching of the pulp.

L'invention concerne un procédé de réduction ou d'élimination de la formation de dépôts de sels sur des équipements de traitement résultant de la précipitation de sels insolubles pendant le blanchiment de la pâte à papier. La pâte à papier est soumise à une séquence de blanchiment qui consiste en une pluralité de phases de traitement de la pâte dont au moins une est réalisée dans des conditions alcalines et au moins une est réalisée dans des conditions acides. Un courant de filtrat contenant des sels insolubles dissous est ainsi produit, au moins une partie du courant de filtrat (56) étant combinée avec un courant alcalin (205, 210, 220,225) et de la pâte de sorte que les sels s'associent avec la pâte, que ces derniers soient enlevés du courant de filtrat et que la formation de dépôts de sels sur les équipements de traitement pendant le blanchiment de la pâte à papier soit éliminée ou réduite.

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