Method for treating desulfurization waste liquid of wet oxidation method

A technology for wet oxidation and desulfurization waste liquid, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., to achieve the effect of reducing production costs

Active Publication Date: 2011-12-28
SHOUGANG CORPORATION
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for treating waste liquid from desulfurization by wet oxidati

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  • Method for treating desulfurization waste liquid of wet oxidation method
  • Method for treating desulfurization waste liquid of wet oxidation method

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Embodiment Construction

[0012] Send about 10L of desulfurization waste liquid from the coking plant into the desulfurization liquid storage tank, (desulfurization waste liquid composition: ammonium thiocyanate: 163g / L; ammonium thiosulfate: 150g / L; suspended sulfur: 4g / L; volatile ammonia: 7.5g / L; PDS: 24ppm; PH: 8.9), settle for 12 hours and filter into the decolorization tank, add activated carbon, stir evenly, the decolorization time is about 6 hours, and the temperature is controlled at 35°C. After decolorization is completed, filter, and the filtrate changes from green or light green to colorless or light yellow transparent liquid. The filter residue is sent to the coke oven for coking.

[0013] The decolorized filtrate enters the concentration kettle, and about 1.6 kg of solid NaOH is added therein, stirred evenly, and the pH of the solution is controlled at 8.9. Using the exothermic heat from the dissolution of solid NaOH, the temperature of the liquid in the kettle is automatically raised to...

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Abstract

A method for treating desulfurization waste liquid of a wet oxidation method. The method comprises the following steps: firstly adding a decolorant into desulfurization waste liquid for decolorizing treatment, filtering after decolorization, adding alkali into the filtrate, controlling the PH to be 8-9, performing evaporation concentration under a condition with a negative pressure, condensing the evaporated ammonia gas and water vapor to obtain concentrated ammonia liquor which can be returned to the system for recycle or be used to produce ammonium sulfate, performing fractional crystallization of the concentrated desulfurization liquid to respectively obtain high-purity sodium thiocyanate and sodium hyposulfite. The invention has a simple process, and stable operations, and effectively solves the problem of difficult HPF desulfurization waste liquid treatment in coking enterprises; the method not only reduces the discharge of the waste liquid, but also recovers a lot of chemical products with economic value, and the method has quite significant economic benefits and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of coke oven gas desulfurization waste liquid treatment, and in particular relates to a method for processing wet oxidation desulfurization waste liquid and a subsequent treatment method for waste liquid formed after coke oven gas desulfurization by ammonia liquid phase catalysis. Background technique [0002] H in coke oven gas 2 S content is usually 5 ~ 8g / m 3 , the sulfur oxides generated by combustion will seriously pollute the environment. In addition, when coke oven gas is used as metallurgical fuel, the H 2 Impurities such as S can also seriously affect the quality of steel products. At present, the coke oven gas desulfurization and decyanation processes used in China include the improved sodium anthraquinone disulfonate method (ADA), the ammonia method liquid-phase catalytic desulfurization method (HPF method), the ammonia sulfur cycle washing method (AS method), and the picric acid method. (FRC ...

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Application Information

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IPC IPC(8): C02F9/10C01C1/02C01C3/20C01B17/64
Inventor 晁伟张小明何龙刘洋马泽军
Owner SHOUGANG CORPORATION
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