Chlorine dioxide generation for a zero discharge pulp mill

Details Chlorine dioxide generation for a zero discharge pulp mill Chlorine dioxide generation for a zero discharge pulp mill

D - Textiles, Paper

21

C

D21C 9/14 (2006.01) C01B 11/02 (2006.01) C01B 11/14 (2006.01) D21C 11/00 (2006.01)

Patent

CA 2151172

Chlorine dioxide for a cellulose pulp mill bleach plant is produced by concentrating (evaporating) liquid effiuents from the bleach plant to a concentration level high enough for incineration, incinerating the concentrated effluents to produce an ash, chemically reacting at least a part of the ash to produce chlorate, and using the chlorate in the manufacture of chlorine dioxide. The ash is purified to produce sodium chloride and the sodium chloride is reacted with oxygen and external energy to produce sodium chlorate. The chlorate is then used in the manufacture of chlorine dioxide. Sulfates produced are used to manufacture acid and/or caustic, and heavy metal hydroxides are disposed of. A part of the ash may be used directly in chlorine dioxide manufacture. At least some of the salt from chlorate manufacture may be fed to the chemical recovery loop, including a recovery boiler, in the pulp mill. Evaporated gases may be returned to the pulp mill and bleach plant.

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