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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

Active Publication Date: 2021-04-30
湖南银桥食品添加剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of method that reclaims sodium sulfite from desulfurization waste liquid, to solve the existing recovery process that proposes in the above-mentioned background technology for the recovery of sodium sulfite not thorough enough, and technique is comparatively complicated, easily produces the problem of by-product

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  • A method for recovering sodium sulfite from desulfurization waste liquid

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Experimental program
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Effect test

Embodiment 1

[0035] The concrete steps of the method for reclaiming sodium sulfite from desulfurization waste liquid are as follows:

[0036] S1: Remove suspended impurities in the desulfurization waste liquid: select the desulfurization waste liquid to be treated, put the desulfurization waste liquid in a container, add activated carbon adsorbent to the container, and place the desulfurization waste liquid and the added adsorbent in a mixing device Stir and mix, the rotating speed of the mixing equipment is 200r / min, and the time of stirring and mixing is 5 minutes, the waste liquid after the above stirring and mixing is filtered through the filter screen to remove activated carbon adsorbent and suspended impurities, and the mesh diameter of the filter screen is 35 mesh , the filtered activated carbon adsorbent and suspended impurities are cleaned and continued to be used;

[0037]S2: Remove heavy metal ions in the waste liquid: inject HCl solution and NaCO into the desulfurization waste ...

Embodiment 2

[0041] The concrete steps of the method for reclaiming sodium sulfite from desulfurization waste liquid are as follows:

[0042] S1: Remove suspended impurities in the desulfurization waste liquid: select the desulfurization waste liquid to be treated, put the desulfurization waste liquid in a container, add activated carbon adsorbent to the container, and place the desulfurization waste liquid and the added adsorbent in a mixing device Stir and mix, the rotating speed of the mixing equipment is 210r / min, and the time of stirring and mixing is 6 minutes, the waste liquid after the above stirring and mixing is filtered through the filter screen to remove activated carbon adsorbent and suspended impurities, and the mesh diameter of the filter screen is 35 mesh , the filtered activated carbon adsorbent and suspended impurities are cleaned and continued to be used;

[0043] S2: Remove heavy metal ions in the waste liquid: inject HCl solution and NaCO into the desulfurization waste...

Embodiment 3

[0047] The concrete steps of the method for reclaiming sodium sulfite from desulfurization waste liquid are as follows:

[0048] S1: Remove suspended impurities in the desulfurization waste liquid: select the desulfurization waste liquid to be treated, put the desulfurization waste liquid in a container, add activated carbon adsorbent to the container, and place the desulfurization waste liquid and the added adsorbent in a mixing device Stir and mix, the rotating speed of the mixing equipment is 220r / min, and the time of stirring and mixing is 7 minutes, the waste liquid after the above stirring and mixing is filtered through the filter screen to remove activated carbon adsorbent and suspended impurities, and the mesh diameter of the filter screen is 35 mesh , the filtered activated carbon adsorbent and suspended impurities are cleaned and continued to be used;

[0049] S2: Remove heavy metal ions in the waste liquid: inject HCl solution and NaCO into the desulfurization waste...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/14C01D5/16
CPCC01D5/14C01D5/16C01P2006/80
Inventor 杨志益
Owner 湖南银桥食品添加剂有限公司
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