Recovery of chemicals

Details Recovery of chemicals Recovery of chemicals

D - Textiles, Paper

21

C

9/16

D21C 3/02 (2006.01) D21C 11/00 (2006.01)

Patent

CA 1096110

ABSTRACT Incinerator product obtained from the incineration of black liquor and other spent liquors in the chemicals recovery circuit of a soda pulping process is treated to remove contaminants including chlorides, sulphates and potassium compounds, and to provide recovery of a high proportion of the sodium carbonate originally present in the incinerator product. The incinerator product is treated with water to form a slurry in which substantially pure sodium carbonate monohydrate is crystallised and a major proportion of the contam- inants are dissolved, the sodium carbonate monohydrate is then separated and dissolved sodium carbonate is recovered as a bicarbonate or sesquicarbonate preci- pitate by carbonation of the solution. -1-

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