Method for extracting salt from coking desulphurization waste solution and special device thereof

A technology of coking desulfurization waste liquid and special equipment, which is applied in chemical instruments and methods, thiocyanic acid, inorganic chemistry, etc., can solve the problems of temperature being affected by environmental changes, prolonging the product processing route, and direct entry of concentrated liquid, etc., to achieve product Wide market, low operating costs, and the effect of preventing transfer

Inactive Publication Date: 2011-08-24
JIANGSU ZHONGXIAN GRP CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] In short, the disadvantages of the currently used process mainly include: the concentrated liquid directly enters the crystallizer; the centrifugation temperature of crystallization is affected by environmental changes; Recrystallization treatment prolongs the processing route of the product; the chemical conversion technology of mixed salt or ammonium thiosulfate has not been reported until now, and the common treatment method is to sell mixed salt as fertilizer

Method used

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  • Method for extracting salt from coking desulphurization waste solution and special device thereof
  • Method for extracting salt from coking desulphurization waste solution and special device thereof

Examples

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Embodiment 1

[0027] A method for extracting salt from coking desulfurization waste liquid, comprising the following steps:

[0028] Under the conditions of 80-85°C and vacuum degree of 0.095Mpa, heat the coking desulfurization waste liquid and react for 2-4 hours to decompose polysulfides to remove sulfur and ammonia, and add 1-2% activated carbon equivalent to the volume of the coking desulfurization waste liquid Adsorb the precipitated sulfur and ammonia, as well as impurities in the solution, to obtain a clear night, the pH of the clear liquid is less than 7; heat and evaporate the concentrated clear liquid to obtain a concentrated liquid; under normal pressure or negative pressure of 0.03Mpa, use Ultrafiltration material, at 80-85°C, heat-filter the concentrate at a constant temperature to remove fine sulfur particles to obtain a clean concentrate; the clean concentrate is cooled and crystallized in a crystallizer, firstly controlled at 70°C, crystallized ammonium sulfate, and separated...

Embodiment 2

[0030] As shown in the drawings, it is a special device for the method of extracting salt from coking desulfurization waste liquid of the present invention. The device includes an evaporation concentrator 1, a constant temperature ultrafilter 2, a cooling crystallizer 3, a constant temperature washing separator 4, and a vacuum evaporator. The bottom of the evaporation concentrator 1 is provided with a concentrate discharge pipe 5, and the concentrate discharge pipe 5 is connected to the top inlet of the constant temperature ultrafilter 2; a net concentrate discharge pipe 6 is arranged at the bottom of the constant temperature ultrafilter 2, and the net concentration The liquid discharge pipe 6 is connected with the cooling crystallizer 3; the crystallization slurry discharge pipe 7 is arranged at the bottom of the cooling crystallizer 3, and the crystallization slurry discharge pipe 7 is connected with the constant temperature washing separator 4.

[0031] During the operation...

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Abstract

The invention discloses a method for extracting salt from coking desulphurization waste solution and a special device thereof. The method comprises the following steps of: heating raw material waste solution for decomposition, adsorbing and decolorizing, then heating, evaporating and concentrating to obtain concentrated solution, performing heat filtration at constant temperature to remove fine sulfur particles, cooling and crystallizing in a crystallizer, filtering at constant temperature, separating filtrate to obtain crystals, washing the crystals to obtain high-purity ammonium thiocyanate, dissolving mixed salt crystals in ammonium sulfate mother liquor, regulating the acidity to be below 20 percent, preheating to ensure that the temperature is between 90 and 110 DEG C, blowing air oroxygen, performing oxidative transformation for 1min to obtain ammonium sulfate transformation liquid, and adding ammonium sulfate production mother liquor to obtain an ammonium sulfate product. By the method, a high-purity product can be extracted from the waste solution through one-time operation, so that processing and treatment times are reduced; solid-phase impurities are effectively intercepted and prevented from transferring to the crystals at constant temperature; and the mixed salt is subjected to oxidative transformation treatment, all ammonium thiosulfate is transformed into the ammonium sulfate product with high nitrogen content, the process is simple, operation cost is low, and product marketing is broad.

Description

technical field [0001] The present invention relates to a method for extracting salt from waste liquid produced in the desulfurization and decyanation process of coking coal gas and a special device thereof, in particular to a method for extracting salt from coking desulfurization waste liquid which involves the technology of removing impurities from mother liquid before crystallization and its special devices. Background technique [0002] At present, the use of wet catalytic oxidation to remove hydrogen sulfide in gas is a major part of the gas purification process, which is characterized by high desulfurization efficiency, but the main disadvantage is the by-product salt and water, which constitute desulfurization waste liquid. In addition to the desulfurization process imported from abroad, the desulfurization devices currently in operation in my country have no matching waste liquid treatment process for the desulfurization methods developed by China. Such as PDS desul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01C1/246C01C3/20C02F1/28C02F1/44
Inventor 袁长胜崔平张超群
Owner JIANGSU ZHONGXIAN GRP CO LTD
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