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Step-by-step separation system and method for extracting salts from coking HPF desulfurizing solution by aqueous phase method

A desulfurization liquid and water phase technology, applied in the direction of thiosulfate/dithionite/polythionate, thiocyanate, etc., can solve the problems of reduced desulfurization effect, inability to biochemical treatment, production system corrosion, etc. Achieve the effect of realizing zero discharge of pollution control, realizing comprehensive recycling of resources, and avoiding pollution

Inactive Publication Date: 2014-05-28
光阳工程技术有限公司
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Problems solved by technology

After the sulfide enrichment in the desulfurization liquid, on the one hand, the desulfurization effect is seriously reduced, and on the other hand, it causes serious corrosion to the production system
Because the desulfurization liquid contains thiocyanate ions, it cannot be biochemically treated. If the desulfurization liquid is directly discharged, it will seriously pollute the environment

Method used

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  • Step-by-step separation system and method for extracting salts from coking HPF desulfurizing solution by aqueous phase method

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with drawings and embodiments.

[0030] A coking HPF desulfurization liquid aqueous phase method step-by-step separation salt extraction system such as figure 1 As shown, the process flow of the present invention is: decolorization - filtration - concentration - filtration - crystallization - filtration - crystallization - finished product. Specifically: the desulfurization liquid in the coking plant is input into the raw liquid storage tank 1 through the pipeline, and flows into the primary filter tank 2 through the pipeline. The primary filter tank 2 is an open structure, and a filter cloth is laid inside. The bottom enters the horizontal storage tank 3; the desulfurization liquid in the horizontal storage tank 3 enters the decolorization kettle 5 through the feeding pump 4. 98 o Above C, an electric stirrer is installed in the kettle, and activated carbon is added into the kettle. After the desulf...

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Abstract

The invention relates to a step-by-step separation system and method for extracting salts from coking HPF desulfurizing solution by an aqueous phase method. The step-by-step separation system comprises a primary filtering and decolorizing system, a first-level evaporating concentrating and crystallizing system, a second-level concentrating and crystallizing system, a repulping concentrating and crystallizing system, and a vacuum heating and condensing system, wherein the primary filtering and decolorizing system is communicated with the first-level evaporating concentrating and crystallizing system through a mother liquor tank, and is also communicated with the vacuum heating and condensing system; the first-level evaporating concentrating and crystallizing system is communicated with the second-level concentrating and crystallizing system, and is also communicated with the repulping concentrating and crystallizing system and the vacuum heating and condensing system. The step-by-step separation system adopts a step-by-step concentrating and separating technology of the aqueous phase method to separate and extract thiocyanate and thiosulfate from the desulfurizing solution through high separation and cold crystallization; meanwhile, separated secondary salt is recycled, so that the content of the secondary salt in the desulfurizing solution is decreased, the coking desulfurization is carried on in the positive direction, and the desulfurizing efficiency is improved; in addition, the recycled secondary salt has a high economic value, and the pollution problem due to the coking desulfurizing solution is solved.

Description

technical field [0001] The invention relates to a coking HPF desulfurization liquid aqueous phase method for step-by-step separation and salt extraction system and method. Background technique [0002] In the desulfurization process of the coking plant using ammonia as the alkali source and the catalyst of dinuclear phthalocyanine cobalt sulfonate (PDS) catalyst, when the salt content of the desulfurization liquid reaches 350g / L, the desulfurization efficiency is significantly reduced, and a part of the desulfurization liquid must be discharged. The approximate composition of the desulfurization solution is as follows: (NH 4 ) 2 S 2 o 3 : 30-50 g / L; NH 4 CNS: 120-160 g / L; pH: 8.80. At present, domestic coking desulfurization liquid generally does not have advanced treatment, and is only sprayed on coal piles as water for coal preparation. This method only solves the problem of desulfurization liquid removal, and there is no waste liquid on the surface, but it does not ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/64C01C3/20
Inventor 孙式超魏佑涛吕子祥梁树旺刘宁亓庆台潘长燕
Owner 光阳工程技术有限公司
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