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Method for recovering ammonium sulfate and ammonium thiocyanate from desulfuration waste liquor

A desulfurization waste liquid, ammonium thiocyanate technology, applied in the direction of thiocyanate, ammonium sulfate, etc., can solve the problem of not considering the influence of ammonium sulfate, and achieve the effect of reducing the circulation amount, improving the desulfurization efficiency, and solving environmental problems

Active Publication Date: 2012-09-19
邢台旭阳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not consider the impact of the concentration of ammonium sulfate on the separation method in the separation process.

Method used

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  • Method for recovering ammonium sulfate and ammonium thiocyanate from desulfuration waste liquor

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Take coke oven gas desulfurization waste liquid 1100g [from Hebei China Coal Sunrise Coking Co., Ltd., where NH 4 SCN content 23.21wt%; (NH 4 ) 2 SO 4 Content 9.95wt%; (NH 4 ) 2 S 2 o 3 Content 0.83wt%], put it into the settling kettle and let it stand naturally for 8h. After filtering to remove solid particles, the desulfurization waste liquid after preliminary filtration was placed in a decolorization kettle, and then 10 g of activated carbon [purchased from Tianjin Guangfu Science and Technology Development Co., Ltd.] was added to decolorize at 60°C for 90 minutes and then filtered. Put the filtered mother liquor in a first-stage concentrator to concentrate under reduced pressure, the vacuum degree is 0.085MPa, and the concentration temperature is 75°C. After concentrating, 640 g of dehydration was obtained to obtain 460 g of once-concentrated slurry. Send the concentrated slurry into a crystallization tank at 50°C for heat preservation and crystallization fo...

Embodiment 2

[0025] Take coke oven gas desulfurization waste liquid 1100g [from Hebei China Coal Sunrise Coking Co., Ltd., where NH 4 SCN content 23.61wt%; (NH 4 ) 2 SO 4 Content 10.01wt%; (NH 4 ) 2 S 2 o 3Content 1.02wt%], put it into the settling kettle and let it stand naturally for 10h. After filtering to remove solid particles, the desulfurization waste liquid after preliminary filtration was placed in a decolorization kettle, and then 8g of coal ash [purchased from Xingtai Xuyang Coking Co., Ltd.] was added, decolorized at 60°C for 90 minutes, and then filtered. Put the filtered mother liquor in a first-stage concentrator to concentrate under reduced pressure, the vacuum degree is 0.085MPa, and the concentration temperature is 75°C. Concentrate and dehydrate 610g to obtain 490g of a concentrated slurry. Send the concentrated slurry into a 50°C first-stage crystallization tank for heat preservation and crystallization for 90 minutes, then filter the slurry to obtain 115g of am...

Embodiment 3

[0027] Take coke oven gas desulfurization waste liquid 1100g [from Hebei China Coal Sunrise Coking Co., Ltd., where NH 4 SCN content 22.68wt%; (NH 4 ) 2 SO 4 Content 10.21wt%; (NH 4 ) 2 S 2 o 3 Content 1.13wt%], put it into the settling kettle and let it stand naturally for 8h. After removing the solid particles by filtration, the desulfurization waste liquid after preliminary filtration was placed in a decolorization kettle, and then 10 g of coke particles [purchased from Xingtai Xuyang Coking Co., Ltd.] were added, decolorized at 60°C for 90 minutes, and then filtered. Put the filtered mother liquor in a first-stage concentrator to concentrate under reduced pressure, the vacuum degree is 0.085MPa, and the concentration temperature is 75°C. Concentrate and dehydrate 650g to obtain 450g of once-concentrated slurry. Send the concentrated slurry into a crystallization tank at 50°C for 90 minutes of heat preservation and crystallization, and then filter the slurry to obta...

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Abstract

The invention relates to a method for recycling chemical wastewater, in particular to a method for recovering ammonium sulfate and ammonium thiocyanate from desulfuration waste liquor. By the method, inorganic salt in the desulfuration waste liquor generated by a phthalocyanine cobalt sulfonate (PDS) method in a coking plant is extracted by a two-stage concentration and fractional crystallization separation method. The method is easy to operate and control, the purity of the ammonium thiocyanate which is finally recovered reaches more than 98 percent, and the yield reaches more than 80 percent. By the method, the circulation volume of desulfuration liquor in a desulfuration working section and the total salt content in the desulfuration liquor are reduced, and the desulfuration efficiency of the desulfuration working section is improved; environmental problems generated by wastewater discharge pollution of coking plants are solved; and useful chemical raw materials are recovered from the desulfuration waste liquor, so that social, environmental and economic benefits for enterprises are increased.

Description

technical field [0001] The invention relates to a treatment method for recycling chemical waste water, in particular, the invention relates to a method for recovering ammonium sulfate and ammonium thiocyanate from desulfurization waste liquid. Background technique [0002] Coke oven gas can be used not only as an important gas fuel with medium and high calorific value for industrial or civil use, but also as raw material gas for the production of synthetic ammonia, methanol and other products. During the coking process, part of the sulfur in the raw coal is converted into hydrogen sulfide (H 2 S) and other sulfide forms and enter the coke oven gas to form gaseous impurities. In addition, the gaseous impurities also contain hydrogen cyanide (HCN). These gas impurities not only affect the gas quality, but also cause corrosion of equipment. Therefore, coke oven gas must be desulfurized and decyanidated before being used as fuel gas and synthesis gas. [0003] The PDS wet des...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/24C01C3/20
Inventor 张英伟刘小晨张凌伟王耀红孙长江
Owner 邢台旭阳科技有限公司
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