Method for treating ammonia desulfurization waste liquid by oxidation method

A technology for ammonia desulfurization and desulfurization waste liquid, which is applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, separation methods, etc., can solve the problems of ammonium thiocyanate resource destruction, expensive equipment maintenance costs, expensive materials, etc., to achieve Simplified process flow, simple and convenient component separation

Inactive Publication Date: 2013-04-10
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

The oxidation efficiency of the Herohax process is very high, and useful products can be obtained, which can increase the yield of ammonium sulfate. However, this process method requires the equipment to be made of titanium alloy stainless steel corrosion-resistant materials. Due to the high cost of materials and expensive construction costs , the maintenance

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  • Method for treating ammonia desulfurization waste liquid by oxidation method

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Embodiment Construction

[0028] The process flow of the method of the present invention is as follows figure 1 As shown, the main equipment of the process device includes an oxidizer 1, an evaporation concentrator 5, a first cooling crystallizer 6, a second cooling crystallizer 8, a first crystal separator 7 and a second crystal separator 9. The specific implementation process of the method of the invention is as follows:

[0029] The ammonia desulfurization waste liquid B to be processed from the desulfurization device is pumped into the oxidizer 1, and the amount of heating steam C is adjusted to make the temperature of the waste liquid in the container within the range of 50-100oC, while blowing in air or oxygen A, Oxidize the waste liquid. The blowing amount of air or oxygen A is 30 to 150 times the volume of the waste liquid, and the reaction time is controlled within the range of 60 to 120 minutes. The reaction oxidation liquid is put into the sedimentation separator 2 for static decant separatio...

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Abstract

The invention provides a method for treating ammonia desulfurization waste liquid by an oxidation method, and belongs to the technical field of desulfurization waste liquid treatment. According to the method, oxidation reaction is conducted by blowing air or oxygen into the ammonia desulfurization waste liquid; ammonium thiosulfate in the desulfurization waste liquid is oxidized into ammonium sulfate in the oxidation reaction process; ammonium thiocyanate is not oxidized, but continues to be reserved in the desulfurization waste liquid; and then ammonium thiocyanate is extracted through evaporation and secondary crystallization. The method is suitable for treating desulfurization waste liquid generated in a gas desulfurization and decyanation technological process by a catalytic oxidation method, and suitable for waste liquid treatment in the desulfurization technology field of hydrogen sulfide such as coke oven gas, natural gas, coalbed methane and refinery gas. With the adoption of the method, ammonium thiosulfate salt in the waste liquid can be converted to ammonium sulfate salt, ammonium thiocyanate salt can be protected, and ammonium sulfate salt and ammonium thiocyanate salt can be separated and purified from the waste liquid into a product.

Description

technical field [0001] The invention belongs to the technical field of desulfurization waste liquid treatment, and in particular relates to a method for treating ammonia desulfurization waste liquid by oxidation. Background technique [0002] The catalytic oxidation desulfurization process using ammonia as the alkali source will inevitably produce desulfurization waste liquid. For a long time, the domestic desulfurization process has no supporting design, and most of the waste liquid produced is consumed by remixing coking coal or being used for wet coke quenching. Coke equipment corrosion, gas desulfurization costs increase, and gas system equipment corrosion rate rises. The existing waste liquid treatment devices basically adopt fractional crystallization physical process, which is not easy to extract high-purity qualified products at one time. The reason is that there are many sulfur compounds and salts in the waste liquid. Ammonium sulfate, ammonium thiosulfate, ammoni...

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Application Information

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IPC IPC(8): C02F1/72C02F1/74C02F9/10C01C1/24C01C3/20B01D53/78B01D53/48
Inventor 崔平张超群许立信刘祥袁长胜
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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