Method for producing sodium sulfite by desulfurizing flue gas by double-alkali process
A technology of sodium sulfite and double alkali method, applied in the field of environmental treatment and industrial production, can solve problems such as blockage, and achieve the effect of high degree of automation, good benefits, and easy maintenance and installation.
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[0019] Using sodium hydroxide solution as a desulfurizer to react with sulfur dioxide in flue gas to prepare sodium sulfite, the preparation process is:
[0020] (a) Add sodium hydroxide solution to increase the pH value of the desulfurization circulating fluid from 5 to 6 to 8. One can increase the desulfurization efficiency from 90% to about 97%; the other is to inhibit the formation of NaHSO 3 The direction of the side reaction is carried out so that it can generate Na as much as possible 2 SO 3 ; The third is to avoid acidic water corrosion.
[0021] (b) Draw out part of the desulfurization circulating liquid, enter the decolorization kettle to decolorize and absorb impurities, and add a strong reducing agent at the same time to make Na 2 SO 4 reduction;
[0022] Lead out 5-8% of the circulating fluid from the outlet of the circulating pump, enter the decolorization tank, control the temperature at 67°C, add 3% activated carbon for decolorization, and further absorb d...
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