Process for recovering chemicals from the waste liquors of...

Details Process for recovering chemicals from the waste liquors of... Process for recovering chemicals from the waste liquors of...

D - Textiles, Paper

21

C

9/36.3

D21C 11/00 (2006.01)

Patent

CA 1075859

PROCESS FOR RECOVERING CHEMICALS FROM THE WASTE LIQUORS OF SULFATE CELLULOSE DIGESTION AND THE WASTE WATERS OF BLEACHING ABSTRACT OF THE DISCLOSURE A process for the recovery of chemicals from the waste liquors of sulfate cellulose digestion and from the waste waters of bleaching, wherein a melt from a soda-ash roaster, mainly containing sodium sulfide and sodium carbonate, but also sodium chloride, is dissolved and clarified to produce green liquor containing sodium carbonate, sodium sulfide and sodium chloride is disclosed. The sodium carbonate and the sodium sulfide, which contains most of the sodium chloride, are separated from each other, at least part of the sodium chloride being separated by evaporation crystal- lization from the sodium sulfide in solution, at least part of the sodium carbonate being causticized into sodium hydroxide, and the sodium hydroxide and sodium sulfide in solutions being mixed together in a ratio suitable to form a digestion solution with a desired sulfide content.

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