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Method of lowering pH value and desulfurizing flue of sync process alkali preparing effluent

A technology of alkali-making waste liquid and synchronous method, applied in separation methods, chemical instruments and methods, water/sludge/sewage treatment, etc. The effect of low treatment cost, saving of raw material cost and land occupation

Inactive Publication Date: 2004-11-24
TIANJIN BOHUA YONGLI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] At present, the neutralization of soda-making waste liquid of ammonia-soda plant and the desulfurization of flue gas of self-provided power station are carried out separately. Due to the high price of neutralizer and desulfurizer, and the neutralization of soda-making waste liquid and the desulfurization of flue gas of self-provided power station It is necessary to build a set of dedicated treatment devices respectively, which makes the treatment cost very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The pH value is 10.54, the temperature is 46 ℃, and the ammonia distillation waste liquid with effective calcium oxide CaO 0.6g / l in the waste liquid is sent to the absorber and the SO 2 The concentration is 2950mg / Nm 3 The flue gas contacts and undergoes absorption reaction, and the soda making waste liquid absorbs and removes SO in the boiler flue gas 2 , and the alkalinity of the alkali-making waste liquid is also neutralized. Absorb flue gas SO 2 Post-distillation ammonia waste liquid PH value is the change result of alkalinity as follows:

[0035] PH value of ammonia distillation waste liquid 10.54 9.5 9.08 8.76

[0036] Waste liquid absorbs SO 2 Concentration, g / l 0 1.15 1.25 1.37

[0037] The soda making waste liquid described in the example absorbs SO 2 Concentration, is to absorb SO with waste liquid 2 Sulfur in salts such as sulfite and sulfate is converted into SO 2 Come, the same below.

Embodiment 2

[0039] The pH value is 11.4, the temperature is 47 ° C, the waste liquid effective calcium oxide CaO 5.5g / l mixture of ammonia distillation waste liquid and brine waste sludge is sent to the absorber and the SO 2 The concentration is 3325mg / Nm 3 The flue gas contacts and undergoes absorption reaction, and the soda making waste liquid absorbs and removes SO in the boiler flue gas 2 , and the alkalinity of the alkali-making waste liquid is also neutralized. Absorb flue gas SO 2 Post-distillation ammonia waste liquid PH value is the change result of alkalinity as follows:

[0040] Mixture pH 11.4 10.94 9.06 8.52

[0041] Waste liquid absorbs SO 2 Concentration, g / l 0 1.21 1.72 2.05

Embodiment 3

[0043] Send the ammonia distillation waste liquid with a pH value of 11.24, a temperature of 55°C, and an effective calcium oxide CaO of 3.4g / l in the waste liquid to the absorber and the SO 2 The concentration is 2850mg / Nm 3 The flue gas contacts and undergoes absorption reaction, and the soda making waste liquid absorbs and removes SO in the boiler flue gas 2 , and the alkalinity of the alkali-making waste liquid is also neutralized. Absorb flue gas SO 2 Post-distillation ammonia waste liquid PH value is the change result of alkalinity as follows:

[0044] Waste liquid PH value 11.24 10.92 9.06 8.86

[0045] Waste liquid absorbs SO 2 Concentration, g / l 0 0.98 1.48 1.72

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Abstract

The method of lower pH value and desulfurizing flue of sync process alkali preparing effluent includes the following steps: feeding the alkali preparing effluent and the flue into absorber for eliminating SO2 in boiler flue with the absorbing alkali preparing effluent and neutralizing the alkality of alkali preparing effluent simultaneously. The present invention treats the two main kinds of pollution, including alkali preparing effluent and flue with SO2, simultaneously in one set of apparatus, and can utilize the waste resource and low pollution treating cost.

Description

technical field [0001] The invention relates to a method for reducing the pH value of soda-making waste liquid and a method for flue gas desulfurization, in particular to a method for synchronously reducing the pH value of soda-making waste liquid and flue gas desulfurization. Background technique [0002] There are two major sources of pollution in the ammonia-soda plant, one is the waste liquid of alkali-making, and the other is the sulfur dioxide in the flue gas discharged from the boiler of the alkali plant. [0003] The soda-making waste liquid refers to the ammonia distillation waste liquid discharged from the bottom of the ammonia distillation tower of the ammonia recovery equipment and the bottom of the brine mud washing bucket during the soda production process of the ammonia-soda method soda ash plant (abbreviated as the ammonia-soda plant, the same below). Brine waste sludge or a mixture of the two, wherein the ammonia distillation waste liq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78C02F1/00
Inventor 薛邦春常宗臣常红林廖新华张祥东
Owner TIANJIN BOHUA YONGLI CHEM IND
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