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Technology for extracting ammonium thiosulfate and ammonium thiocyanate by desulphurization waste liquid

A technology of ammonium thiosulfate and ammonium thiocyanate, applied in the field of desulfurization, can solve the problems of unutilized latent heat of water vapor, large heating steam consumption, large equipment investment, etc., and achieves easy separation, small equipment investment, and low energy consumption. Effect

Active Publication Date: 2013-07-24
鞍钢集团工程技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] This patent is mainly for product purification of the evaporated slurry, the latent heat of the evaporated water vapor is not utilized, the heating steam consumption is large, and the energy consumption is high
Evaporation equipment is jacketed heating, low thermal efficiency, large equipment investment

Method used

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  • Technology for extracting ammonium thiosulfate and ammonium thiocyanate by desulphurization waste liquid

Examples

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Embodiment Construction

[0021] Combine below figure 1 The present invention is further described by examples.

[0022] like figure 1 As shown, a process for extracting ammonium thiosulfate and ammonium thiocyanate from desulfurization waste liquid, the process is as follows: the desulfurization liquid containing ammonium thiosulfate and ammonium thiocyanate filtered by activated carbon from the desulfurization system is passed through the pipeline. 1 is sent to the desulfurization liquid tank 2 after decolorization, and is sent to the inlet pipe 6 of the first evaporator circulating pump 5 by the pump 3 through the pipeline 4. 9. The detected liquid level adjusts the valve opening. After the material in the first evaporator 8 is pumped out by the circulating pump 5 and indirectly heated by the external first evaporator heater 10, part of the material is returned to the first evaporator 8 through the pipeline 11 to provide the first evaporator 8 with the heat required for evaporation. Part of it is...

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Abstract

The invention provides a technology for extracting ammonium thiosulfate and ammonium thiocyanate by a desulphurization waste liquid. The technology comprises the following steps: a desulphurization liquid filtered by active carbon in a desulphurization system is sent to a first evaporator by a transfer pump, a material in the first evaporator is heated by an external heater, a part of material is returned to the evaporator, and a part of the material is sent to a second evaporator; the material in the second evaporator is heated by the external heater, and then a part of the material is returned to the second evaporator, and a part of the material is sent to a third evaporator; and the material in the third evaporator is directly heated by the external heater and then is returned to the third evaporator, the second evaporator and the third evaporator take water vapor generated by the first evaporator through evaporation as a heat source for heating. The bottom material of the third evaporator is sent to a crystallizer through a crystallization pump, a crystallization liquid is separated, the separated solid is the product containing ammonium thiosulfate, and a centrifugate is collected and then crystallized to obtain the product containing ammonium thiocyanate. The technology has the characteristics of continuous production of salt extraction operation by the desulphurization liquid, low energy consumption, low engineering construction and the like.

Description

technical field [0001] The invention belongs to the technical field of desulfurization, and in particular relates to a liquid containing ammonium thiosulfate (sodium), ammonium thiocyanate (sodium) and ammonium sulfate (sodium) produced by gas desulfurization. Process and device for ammonium thiosulfate (sodium), ammonium thiocyanate (sodium) and ammonium (sodium) sulfate. Background technique [0002] At present, there are various processing methods for extracting ammonium thiosulfate and ammonium thiocyanate from desulfurization waste liquid. The more advanced and representative processing devices are as follows: [0003] The patent number applied by Suzhou Jiuwang Duoammonium Salt Technology Co., Ltd.: 200510095591.6, an invention patent named "treatment method of coke oven gas desulfurization and decyanation wastewater". Decolorization is carried out by adding activated carbon to the desulfurization and decyanation wastewater, and then filtering to obtain clear liquid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/64C01C3/20
Inventor 王波陆友文王淑玲赵昌伟
Owner 鞍钢集团工程技术有限公司
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