A method of recovery of chemical compounds from a pulp mill

Details A method of recovery of chemical compounds from a pulp mill A method of recovery of chemical compounds from a pulp mill

D - Textiles, Paper

21

C

D21C 11/00 (2006.01)

Patent

CA 2219550

The build up of unwanted components, particularly potassium and chloride values, in pulp mill recovery cycles is avoided by processing pulp mill recovery cycle precipitator ash. The ash first is dissolved in water and the aqueous solution then is evaporated to crystallize sodium sulfate, which then can be returned to the pulp mill recovery cycle. The mother liquor from such crystallization is subjected to extractive crystallization to recover further quantities of crystalline sodium sulfate for return to the pulp mill recovery cycle. The purge stream containing chloride values is removed from the cycle.

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