A method for recovering sodium sulfite from desulfurization waste liquid

A technology of desulfurization waste liquid and sodium sulfite, which is applied in the preparation of alkali metal sulfite, purification of alkali metal sulfite/sulfite, etc., can solve the problems of easy production of by-products, complicated process, and insufficient recovery of sodium sulfite, etc. Adsorption effect, effect of ensuring purity
CN109437246BActive Publication Date: 2021-04-30湖南银桥食品添加剂有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
湖南银桥食品添加剂有限公司
Publication Date
2021-04-30

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Abstract

The invention disclosed by the invention belongs to the technical field of sodium sulfite preparation, and specifically relates to a method for recovering sodium sulfite from desulfurization waste liquid. The specific steps of the method for recovering sodium sulfite from desulfurization waste liquid are as follows: S1: remove suspended impurities in desulfurization waste liquid; S2: remove heavy metal ions in the waste liquid; S3: react sodium sulfate in the waste liquid to form sodium sulfite; S4: prepare anhydrous sodium sulfite by cooling and crystallization, and increase the adsorption effect by mixing and adsorbing suspended impurities in advance and stirring to achieve The function of filtering the suspended impurities in the desulfurization waste liquid; the heavy metal particles in the desulfurization waste liquid are removed by precipitation, so as to avoid the influence of heavy metal particles on normal recovery, and the heavy metals affect the food safety; through the function of vacuum extraction of oxygen, avoid oxidation of sodium sulfite , to avoid affecting the efficiency of preparing sodium sulfite; it is prepared by crystallization of anhydrous sodium sulfite to ensure its purity.
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Description

technical field

[0001] The invention relates to the technical field of sodium sulfite preparation, in particular to a method for recovering sodium sulfite from desulfurization waste liquid. Background technique

[0002] Sodium sulfate, chemical formula Na2SO3, common sulfite, white, monoclinic crystal or powder. It is irritating to eyes, skin and mucous membranes, and can pollute water sources. Decomposition by high heat produces toxic sulfide fumes.

[0003] In the food industry, it is used as bleaching agent, preservative, loosening agent and antioxidant. It is also used in pharmaceutical synthesis and as a reducing agent in the production of dehydrated vegetables.

[0004] For example, Chinese Patent Publication No. CN107648948A discloses a process for recovering sodium sulfite through catalytic cracking flue gas dedusting and desulfurization. Including dust removal system, desulfurization system, and sodium sulfite recovery system; the dust removal system is a bag fi...

Claims

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