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Method for extracting salts from desulfurization waste liquid by using air oxidation

A desulfurization waste liquid and air oxidation technology, which is applied in chemical instruments and methods, oxidized water/sewage treatment, gaseous effluent wastewater treatment, etc., to achieve the effects of less investment, improved purity and concentration, and simple operation

Inactive Publication Date: 2017-11-03
泰安金塔化工机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for extracting salt from desulfurization waste liquid by air oxidation to extract qualified ammonium thiocyanate and ammonium sulfate, which has low operating cost, simple operation, low investment, high product quality, and completely solves secondary pollution problem

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this embodiment, first, the desulfurization waste liquid is filtered through a plate and frame filter press to remove insoluble impurities and suspended sulfur in the desulfurization waste liquid.

[0037] Secondly, the desulfurization waste liquid is discharged from the liquid inlet on the top of the air oxidation tower, and the liquid level of the air oxidation tower is kept at 85%, and the compressed air with a flow rate of 10Nm3 / min is discharged from the air inlet of the air oxidation tower by an air compressor. Pass in, close the liquid outlet, the steam coil is fed with steam with a steam pressure of 0.2MPa, the reaction temperature is 97°C, and the reaction is carried out for 5 hours, the valve of the liquid outlet is opened, and the waste liquid after the reaction is passed through The plate and frame filter press is used for filtration to obtain the oxidized waste liquid.

[0038] Afterwards, pass the oxidation waste liquid into the decolorization kettle, a...

Embodiment 2

[0043] In this embodiment, first, the desulfurization waste liquid is discharged from the liquid inlet on the top of the air oxidation tower, and the liquid level of the air oxidation tower is kept at 90%, and the compressed air with a flow rate of 20Nm3 / min is oxidized from the air by an air compressor. The air inlet of the tower is connected, and the liquid outlet is closed. The vapor pressure of 0.4MPa steam is introduced into the steam coil, and the reaction temperature is 100°C. The reaction is carried out for 4 hours, the valve of the liquid outlet is opened, and the reacted The waste liquid is filtered through a plate and frame filter press to obtain the oxidized waste liquid.

[0044] Next, pass the oxidation waste liquid into the decolorization kettle, add powdery activated carbon, and carry out vacuumizing operation, the vacuum degree is controlled at -0.1MPa, and heat and stir at the same time, the heating temperature is 90 ° C, heat and stir for 4 hours, and then T...

Embodiment 3

[0049] In this embodiment, first, the desulfurization waste liquid is filtered through a plate and frame filter press to remove insoluble impurities and suspended sulfur in the desulfurization waste liquid.

[0050] Secondly, the desulfurization waste liquid is discharged from the liquid inlet on the top of the air oxidation tower, and the liquid level of the air oxidation tower is kept at 80%, and the compressed air with a flow rate of 6Nm3 / min is discharged from the air inlet of the air oxidation tower by an air compressor. Introduce and close the liquid outlet, the steam coil is fed with steam with a steam pressure of 0.3MPa, the reaction temperature is 80°C, and the reaction is carried out for 15 hours, the valve of the liquid outlet is opened, and the waste liquid after the reaction is passed through The plate and frame filter press is used for filtration to obtain the oxidized waste liquid.

[0051] Afterwards, pass the oxidation waste liquid into the decolorization kett...

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Abstract

The present invention relates to the technical field of desulfurization waste liquid treatment, and specifically provides a method for extracting salts from a desulfurization waste liquid by using air oxidation. The method comprises: carrying out air oxidation on a desulfurization waste liquid, and filtering, wherein the obtained filtrate is an oxidation waste liquid; carrying out decolorization treatment on the oxidation waste liquid, and filtering, wherein the obtained filtrate is decolorization waste liquid; carrying out heating evaporation concentration on the decolorization waste liquid, and filtering, wherein the obtained filtrate is concentrated waste liquid, and the obtained solid is ammonium sulfate; and crystallizing the concentrated waste liquid to obtain ammonium sulfate and ammonium thiocyanate. According to the present invention, the qualified ammonium sulfate and the qualified ammonium thiocyanate are extracted through air oxidation, filtration, concentration, crystallization, filtration, crystallization, centrifugation and other steps, such that the method has advantages of low operation cost, simple operation, less investment, high product quality, and complete secondary pollution problem solving.

Description

technical field [0001] The invention relates to the technical field of desulfurization waste liquid treatment, in particular to a method for extracting salt from desulfurization waste liquid by air oxidation. Background technique [0002] At present, most coking plants carry out ammonia desulfurization, which will generate a large amount of desulfurization waste liquid, and the desulfurization waste liquid needs to be further processed to extract ammonium sulfate, ammonium thiocyanate and other products. The existing method mainly oxidizes the ammonium thiosulfate in the desulfurization waste liquid to ammonium sulfate by adding sulfuric acid or a strong oxidant, so as to obtain the qualified product ammonium sulfate. However, there are problems of complicated operation, high cost and easy generation of secondary pollution. Contents of the invention [0003] The purpose of the present invention is to provide a method for extracting salt from desulfurization waste liquid b...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01C1/242C01C3/20C02F103/18
CPCC01C1/242C01C3/20C02F1/001C02F1/048C02F1/283C02F1/74C02F9/00C02F2103/18
Inventor 焦广磊张京旭
Owner 泰安金塔化工机械有限公司
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