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994 9 Recovery

Cooking /

washing COOKING

CHEMICAL

CYCLE

Evaporation

Recovery

boiler

Secondary

recovery -

SO2 absorption

from flue gas

Primary

recovery -

SO2 absorption

from relief gas

RELIEF GAS

RECYCLE

Fig. 9.17 The sulphite cooking chemical cycle.

Following evaporation, thick spent sulfite liquor is usually fired in a recovery

boiler under an oxidative environment. Sulfur leaves the boiler in the form of SO2

with the flue gas, and is subsequently absorbed from the flue gas in the secondary

recovery system. The design of both recovery boilers and secondary recovery systems

Is largely different between sulfite cooking bases. While magnesium and

sodium bases can be recovered from the spent cooking liquor and re-used for

cooking acid preparation, the recovery of calcium and ammonium bases is not

practicable.

The sulfite pulping process is of declining relevance. New developments in the

area of sulfite recovery are minor and very site-specific. They target mainly at

reduced emissions to atmosphere and at more flexibility regarding combined and

free SO2 in the cooking acid.

References 995

References

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996 9 Recovery

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997

10

Environmental Aspects of Pulp Production

Hans-Ulrich Suss

10.1