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Method for extracting secondary salt from coking desulphurized waste liquid

A technology of coking desulfurization waste liquid and desulfurization waste liquid, which is applied in the direction of thiocyanate, etc., can solve the problems of harsh production site environment, inability to perform biochemical treatment, and increase operating costs, so as to reduce labor intensity of workers, realize automatic production operation, Energy and resource saving effects

Inactive Publication Date: 2012-06-20
泰安金塔化工机械有限公司
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AI Technical Summary

Problems solved by technology

[0002] At present, many domestic gas or coking enterprises adopt the ammonia method (or alkali method) gas desulfurization process, because the desulfurization waste liquid contains thiocyanate ions, which has a strong bactericidal effect , cannot be biochemically treated
If it is not treated and discharged directly, it will cause water pollution and poor production site environment; if it is used as coal blending water, it will still cause secondary pollution and increase operating costs

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0021] When treating the waste liquid obtained by ammonia desulfurization, the following steps are included

[0022] 1. Decolorization:

[0023] Purpose: To lighten the color of the desulfurization solution. physical change.

[0024] Steps and procedures: Put the desulfurization waste liquid into the kettle, add powdered activated carbon, and stir while heating. And carry out vacuuming, control the vacuum degree -0.01--0.1Mpa, the temperature is: 60-90 degrees, the heating time is 0.5-6.5 hours, then discharge and filter, and the filtrate enters the concentration kettle. (Filtered solids are activated carbon and adsorbate)

[0025] 2. Concentration:

[0026] Purpose: to evaporate the water in the solution and increase the concentration of the solution. physical change.

[0027] Procedure: Put the decolorized filtrate into the concentration kettle for concentration. The concentration conditions are: keep the vacuum degree in the kettle at -0.01—-0.1Mpa, and the temperatur...

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PUM

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Abstract

The invention discloses a preparation method for extracting secondary salt (ammonium salt or sodium salt) from coking desulphurized waste liquid, wherein, coking desulphurized waste liquid is processed through the steps such as decolorization, filtration, concentration, filtration, crystallization (purification is carried out if the secondary salt is sodium salt), filtration, drying and the like. The preparation method is characterized in that a one-step crystallization (purification) method is adopted; the preparation method is simple to operate; and simple technology, less equipment, low investment, high content, advanced technology, environmental protection and energy conservation can be achieved.

Description

technical field [0001] The invention is a method for extracting secondary salt from coking desulfurization waste liquid. Background technique [0002] At present, many gas or coking enterprises in China adopt the ammonia method (or alkali method) gas desulfurization process. Since the desulfurization waste liquid contains thiocyanate ions, which have a strong bactericidal effect, they cannot be biochemically treated. If it is not treated and discharged directly, it will cause water pollution and the environment of the production site is bad; if it is used as coal blending water, it will still cause secondary pollution and increase operating costs. How to dispose of coke oven gas desulfurization and decyanation waste liquid and resource regeneration and recycling has always been an environmental protection problem that plagues gas and coking enterprises. Contents of the invention [0003] The purpose of the present invention is to provide a method capable of extracting au...

Claims

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Application Information

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IPC IPC(8): C01C3/20
Inventor 焦广磊
Owner 泰安金塔化工机械有限公司
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