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Waste alkali solution recovery method

A recovery method and alkali solution technology, which is applied in the field of waste alkali solution recovery, can solve problems such as cellulose removal that cannot meet the recycling standard, and achieve the effects of alleviating the difficulty of filtration, improving utilization, and reducing COD and BOD

Inactive Publication Date: 2012-08-01
YIBIN GRACE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem that the above-mentioned required equipment is more, the simple hydrogen peroxide injection method in the oxidation stage, the removal of cellulose cannot reach the standard of reuse after waste alkali treatment, and is not suitable for high-concentration alkaline solutions with high cellulose impurity content in the solution. The problem is to provide a method of recycling waste alkali that improves resource utilization and reduces sewage discharge, which can ensure the continuity of production, reduce difficult filtration problems, reduce energy consumption, make production more stable, and quickly remove impurities in wastewater , the effect is good, the solution is easy to precipitate, and at the same time achieve the purpose of saving material consumption and reducing costs

Method used

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Embodiment 1

[0043] A recovery method for spent alkali solution, comprising the following process steps:

[0044] A, primary coagulation: add inorganic polymer coagulant aqueous solution and organic polymer coagulant aqueous solution successively to spent caustic soda solution, and stir simultaneously;

[0045] B. Primary precipitation filtration: perform a precipitation filtration on the spent alkali solution after primary coagulation;

[0046] C. Secondary coagulation: Add an aqueous solution of an inorganic polymer coagulant and an aqueous solution of an organic polymer coagulant to the spent caustic soda solution after the primary precipitation and filtration, and stir simultaneously;

[0047] D. Secondary precipitation filtration: perform secondary precipitation filtration on the spent alkali solution after secondary coagulation;

[0048] E. Oxidation: Oxidize the waste alkali solution after secondary precipitation and filtration by using an oxidant;

[0049] F. Adsorption: Activate...

Embodiment 2

[0053] On the basis of Example 1, wherein the oxidation process of step E is preferably:

[0054] The oxidizing agent is one of ozone, hydrogen peroxide, chlorine dioxide, oxygen (air), sodium hypochlorite, potassium permanganate, and nano-titanium dioxide, or a plurality of them in any proportion.

[0055] Wherein the oxidizing agent is preferably the combination of ozone and hydrogen peroxide, ozone (O 3 ) and hydrogen peroxide (H 2 o 2 ) in a molar ratio of 1:0.25;

[0056] The specific oxidation process is as follows: Ozone is introduced into the waste alkali solution after secondary precipitation and filtration, and hydrogen peroxide is sprayed at the same time, and the molar ratio of added ozone and hydrogen peroxide is kept at 1:0.25, and the treatment is carried out for 10 minutes until the secondary precipitation and filtration The spent caustic solution is colorless and clear.

Embodiment 3

[0058] On the basis of Example 1, wherein the oxidation process of step E is preferably:

[0059] The oxidizing agent is one of ozone, hydrogen peroxide, chlorine dioxide, oxygen (air), sodium hypochlorite, potassium permanganate, and nano-titanium dioxide, or a plurality of them in any proportion.

[0060] Wherein the oxidizing agent is preferably the combination of ozone and hydrogen peroxide, ozone (O 3 ) and hydrogen peroxide (H 2 o 2 ) in a molar ratio of 1:2.5;

[0061] The specific oxidation process is as follows: Ozone is introduced into the spent alkali solution after secondary precipitation and filtration, and hydrogen peroxide is sprayed at the same time, and the molar ratio of added ozone and hydrogen peroxide is kept at 1:2.5, and the treatment is carried out for 25 minutes until the secondary precipitation and filtration The spent caustic solution is colorless and clear.

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Abstract

The invention discloses a waste alkali solution recovery method, which is mainly applicable to recovery of waste alkali solution generated during dipping and pressing of pulp in viscose fiber production, and is also applicable to recovery of alkali solution generated during papermaking, pulping, dying, spinning and the like in textile industries. Through procedures of two-stage coagulation, two-stage precipitation and filtration, oxidization, adsorption and the like, the waste alkali solution recovery method ensures continuity of production, reduces filtration difficulties, reduces energy consumption, and enables the production to be more stable. After the alkali solution is treated by the method, the content of impurities in the alkali solution is less, and the chromaticity of the alkali solution is low, thereby realizing the aim of recycling waste alkali. According to the method, equipment investment and energy consumption are low, and operation expense is low; and the method has the characteristics of environmental friendliness, safety and high production efficiency, has remarkable benefits, and can reduce the pollution of the waste alkali on environment.

Description

technical field [0001] The present invention relates to a kind of recovery method of waste liquid, more specifically, the present invention relates to a kind of recovery method of spent caustic soda solution. Background technique [0002] In the production of viscose fiber, it is necessary to go through impregnation and pressing processes. In these two processes, a large amount of liquid caustic soda is consumed, resulting in a large amount of spent caustic soda solution. Because these spent alkali solutions are colored and contain a large amount of cellulose substances, it is very difficult to separate them, and there has been no good way to recycle them, resulting in the consumption of a large amount of sulfuric acid in the subsequent sewage treatment process. It not only pollutes the environment but also causes a waste of resources, and at the same time needs to pay high production costs. In addition, the related textile industries such as papermaking, pulping, dyeing, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/52C02F1/56C02F1/72C02F1/74C02F1/76C02F1/78C02F1/28
Inventor 王兵冯涛邓传东杜金江赵红霞
Owner YIBIN GRACE
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