Method for treatment of spent peroxide bleaching liquors

Details Method for treatment of spent peroxide bleaching liquors Method for treatment of spent peroxide bleaching liquors

D - Textiles, Paper

21

C

9/36.8

D21C 5/02 (2006.01) D21C 11/00 (2006.01)

Patent

CA 1268907

A method for treatment of spent peroxide bleaching liquors A B S T R A C T Water glass is separated and recovered from waste liquors obtained when manufacturing and bleaching high yield pulps and waste-paper pulps, by adding to the waste liquor an inorganic compound containing a multi-valent cation and/or an organic flocculating agent, while simultaneously adjusting the pH of the waste liquor to a value between 3.5 and 7.5, preferably between 4.0 and 6Ø The silicate thus precipitated in the waste liquor is caused to settle to form a sediment, whereafter the sediment is separated and recove- red and the waste liquor thus freed from silicate is retur- ned to the process.

509070

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