Method for processing secondary salt in desulphurization waste liquid

A technology for desulfurization waste liquid and treatment method, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. problems, to achieve good application prospects, reduce production costs, and achieve the effect of reuse

Inactive Publication Date: 2013-04-24
甘肃银光聚银化工有限公司
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  • Abstract
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Problems solved by technology

Although the method of directly discharging to the coal yard is simple, it will destroy the quality of coking coke, increase the energy consumption in the coking process, the materials cannot be recycled, waste materials, waste water cannot be recycled, and water resources are wasted; although electrodialysis Thiocyanate can be produced, but industrialized production has not been realized due to the complicated treatment process, high device cost, and large power consumption; the thiosulfate conversion method has many operating steps, and the reaction needs

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  • Method for processing secondary salt in desulphurization waste liquid

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Embodiment 1

[0022] Example 1: see figure 1 , from the desulfurization process of the gas manufacturing plant, use a centrifugal pump to draw high-salinity desulfurization waste liquid to the sedimentation tank for static precipitation, let it stand for 24~30h, filter to remove the suspended sulfur in the desulfurization liquid, and transport the desulfurization waste liquid to the decolorization kettle through the centrifugal pump , Stir at 20~50℃, decolorize with activated carbon, the particle size of activated carbon is more than 400 mesh, and the consumption is calculated according to 0.5~1g activated carbon / 1L desulfurization liquid. The supernatant in the decolorization kettle is transported to the desulfurization liquid storage tank, and the desulfurization liquid mainly contains Na 2 S 2 o 3 、Na 2 SO 4 , NaCNS three auxiliary salts, of which Na 2 S 2 o 3 Content 250.7g / L, Na 2 SO 4 The content of NaCNS is 115.9g / L, the content of NaCNS is 37.7g / L, the temperature of the de...

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Abstract

The invention relates to a method for processing secondary salt in desulphurization waste liquid, comprising the following steps: a, carrying out pre-treatment on the desulphurization waste liquid, and removing the impurities in the desulphurization waste liquid; b, conveying the desulphurization waste liquid to a de-coloring kettle via a centrifugal pump; c, after atomizing via the nozzle of a spray dryer, drying the desulphurization waste liquid, so that Na2S2O3, Na2SO4 and NaCNS secondary salts can be separated by a manner of solid salts, and recycling the secondary salts which are adopted as inorganic salts to realize the discharge without wastewater. The method for processing the secondary salt in the desulphurization waste liquid disclosed by the invention can rationally process the waste liquid which is produced in the desulphurization step in gas production factories and has a high content of the secondary salt, realizes the discharge without wastewater, effectively recycles the waste heat of systems, realizes the reuse of the heat, reduces the production cost, has simple process and has performance of environmental-friendliness.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for treating secondary salt in desulfurization waste liquid. Background technique [0002] At present, the domestic water gas purification process generally uses Na 2 CO 3 As the alkali source, phthalocyanine cobalt sulfonate ammonium (PDS-600) is used as the catalyst, and the H in water gas is removed by wet oxidation method 2 S craft. The water gas produced by the gas plant enters the bottom of two series-connected desulfurization towers in turn, and contacts the desulfurization liquid sprayed on the top of the tower in reverse, and removes most of the H in the water gas under the action of the PDS-600 catalyst. 2 S. The desulfurization liquid discharged from the bottom of the two desulfurization towers is transported to the rich liquid tank, and then pumped to the regeneration tank by the rich liquid pump, after flotation in the regeneration tank, the ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D5/00C01B17/64C01C3/20
CPCY02P20/129
Inventor 马瑞进崔晓锦陈玫君李晓照杜燕齐国栋张建国
Owner 甘肃银光聚银化工有限公司
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