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Separation method of vinyl-acetate resin from chromium-contained effluent

A technology of vinyl acetate resin and separation method, which is applied in the direction of neutralization water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. It can solve the problems of blocked pipelines and valves, so as to promote resin precipitation, improve flocculation effect, and facilitate separation effect

Inactive Publication Date: 2008-07-02
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of this invention is to address the above-mentioned shortcomings in the traditional method for removing vinyl acetate resin in chromium-containing waste liquid, and propose a kind of separation method that is more practical and can be used in large-scale production of chromium-containing waste liquid. In order to solve the problem that such waste liquid precipitates and forms sediments during transportation and storage to block pipelines, valves and pumps

Method used

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  • Separation method of vinyl-acetate resin from chromium-contained effluent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Lead the waste liquid containing hexavalent chromium into the liquid storage tank made of stainless steel or polypropylene;

[0041] Add calcium hydroxide to the waste liquid containing hexavalent chromium to make the pH value of the waste liquid reach 7;

[0042] Prepare LX cationic flocculant solution, the solution concentration is 0.1‰, and the stirring time is 30 minutes;

[0043] Add LX cationic flocculant solution according to 1% of the waste liquid mass, and stir with a stainless steel paddle stirrer, and keep the shear rate at 8s -1 , to promote the dispersion of flocculant in waste liquid;

[0044] Stir for 5 minutes;

[0045] Use the pump to send the liquid to the frequency conversion sedimentation centrifuge, the working frequency is 30-50HZ;

[0046] The mixed liquor with precipitates is separated into solids in a decanter centrifuge.

Embodiment 2

[0048] Lead the waste liquid containing hexavalent chromium into the liquid storage tank made of stainless steel or polypropylene;

[0049] Add calcium hydroxide to the waste liquid containing hexavalent chromium to make the pH value of the waste liquid reach 9;

[0050] Prepare LX cationic flocculant solution, the solution concentration is 2‰, and the stirring time is 45 minutes;

[0051] Add LX cationic flocculant solution according to 5% of the waste liquid mass, and stir with a stainless steel paddle stirrer, and keep the shear rate at 14s -1 , to promote the dispersion of flocculant in waste liquid;

[0052] Stir for 7 minutes;

[0053] Use the pump to send the liquid to the frequency conversion sedimentation centrifuge, the working frequency is 30-50HZ;

[0054] The mixed liquor with precipitates is separated into solids in a decanter centrifuge.

Embodiment 3

[0056] Lead the waste liquid containing hexavalent chromium into the liquid storage tank made of stainless steel or polypropylene;

[0057] Add calcium hydroxide to the waste liquid containing hexavalent chromium to make the pH value of the waste liquid reach 10.5;

[0058] Prepare LX cationic flocculant solution, the solution concentration is 5‰, and the stirring time is 60 minutes;

[0059] Add the LX cationic flocculant solution according to 10% of the mass of the waste liquid, and stir with a stainless steel paddle stirrer, and keep the shear rate at 20s -1 , to promote the dispersion of flocculant in waste liquid;

[0060] Stir for 8 minutes;

[0061] Use the pump to send the liquid to the frequency conversion sedimentation centrifuge, the working frequency is 30-50HZ;

[0062] The mixed liquor with precipitates is separated into solids in a decanter centrifuge.

[0063] In the above three embodiments, the solid obtained after centrifugal dehydration is a mixture cont...

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Abstract

Separation of acetic ether resin in chromium-contained effluent is carried out by adding chromium-contained effluent into calcium hydroxide solution, making pH of effluent 7-10.5, adding flocculant solution into effluent, mixing while agitating, and separating out solid in mixed liquid. It has better flocculation effect.

Description

technical field [0001] The invention relates to the treatment of industrial waste water, and more specifically refers to a method for separating vinyl acetate resin from chromium-containing waste liquid. The method mainly uses a flocculant to remove the vinyl acetate resin. Background technique [0002] In industrial production, there is a large amount of chromium-containing wastewater that requires harmless treatment. Due to the production of certain types of products, when organic matter such as resin emulsion may be contained in chromium-containing wastewater (such as insulating coating liquid for electrical steel), due to the influence of various factors such as temperature, pH and metal ions, the stability of resin emulsion may be destroyed Therefore, during the transportation and storage of waste liquid, it precipitates and forms sediments, which will cause blockage of pipelines, valves and pumps, and affect production. [0003] In order to solve this problem, Chinese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/66C02F1/52
Inventor 郦希王志成张晓旗严聪陈卓雷
Owner BAOSHAN IRON & STEEL CO LTD
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