Method for extracting ammonium sulfate from ammonia desulphurization wastewater by oxidation process

A technology of ammonia desulfurization and desulfurization waste liquid, which is applied in the direction of ammonium sulfate, etc., and can solve the problems of low added value, destruction of ammonium thiocyanate resources, expensive materials, etc.

Inactive Publication Date: 2013-03-20
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 extracting ammonium sulfate from ammonia desulphurization wastewater by oxidation process

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Embodiment Construction

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

[0029] The ammonia-based desulfurization waste liquid B sent from the desulfurization device is pumped into the oxidizer 1, and the amount of heating steam C is adjusted so that the temperature of the waste liquid in the container is between 50 and 100 o In the range of C, blow air or oxygen A at the same time to make the waste liquid oxidize. The amount of air or oxygen A blown in 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 solution is put into the precipitation separator 2 for static decantation and ...

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Abstract

The invention provides a method for extracting ammonium sulfate from ammonia desulphurization wastewater by an oxidation process, and belongs to the technical field of treatment of desulphurization waste solutions. The method comprises the steps of: carrying out oxidation reaction in a manner of blowing air or oxygen into the ammonia desulphurization wastewater, wherein in the oxidization reaction, ammonium thiosulfate in the desulphurization wastewater is oxidized into ammonium sulfate, ammonium thiocyanate is not oxidized and further maintained in the desulphurization wastewater; and then extracting ammonium sulfate in an evaporation or crystallization manner. The method disclosed by the invention is suitable for treatment of the desulphurization wastewater produced in the air desulfurization and cyanide-removal processes by a catalytic oxidation method. The method is suitable for treatment of waste liquor in the field of the desulfurization process of hydrogen sulfide containing gases such as coke even gas, natural gas, coal bed gas and refinery gas. By using the method disclosed by the invention, ammonium thiosulfate salt in the wastewater can be transformed into ammonia sulfate salt, ammonium thiocyanate is protected, and the ammonium thiosulfate salt and the ammonium thiocyanate can be separated from the wastewater and purified to obtain the products.

Description

technical field [0001] The invention belongs to the technical field of desulfurization waste liquid treatment, in particular to a method for extracting ammonium sulfate from 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 thiosul...

Claims

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Application Information

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IPC IPC(8): C01C1/24
Inventor 崔平张超群何泊宁袁长胜
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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