Comprehensive treatment method of coking desulfurization waste liquid

Abstract

The present invention relates to a comprehensive treatment method of a coking desulfurization waste liquid. The comprehensive treatment method comprises: (1) placing a desulfurization waste liquid into an aeration tank, and adding active carbon; (2) introducing hot wind to the aeration tank; (3) carrying out a decolorizing treatment for 12-16 h, pumping the treatment liquid to a plate-and-frame filter press to carry out pressure filtration, and conveying the filtrate to a decolorizing tank to carry out storage and material preparing; (4) after completing the material preparing, pumping to a vacuum concentration system, and carrying out vacuum concentration to achieve a concentrated solution; (5) pumping into a crystallizer, indirectly cooling with circulating water, and adjusting the specific gravity of the concentrated solution; (6) pumping to the plate-and-frame filter press, and filtering; (7) indirectly cooling with circulating water in the crystallizer, precipitating the ammonium thiocyanate crystal, and carrying out separation collection on the ammonium thiocyanate; and (8) refining the crude ammonium sulfate to obtain the finished product ammonium sulfate. According to the present invention, the treatment process is simple, the produced ammonium sulfate and the produced ammonium thiocyanate meet the regulations of the related products and can be directly sell, and the secondary pollution is avoided.

Description

technical field [0001] The invention relates to a comprehensive treatment method for coking desulfurization waste liquid, which belongs to the field of chemical industry. 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 production process, part of the sulfur in the raw coal is converted into sulfide forms such as hydrogen sulfide and enters the coke oven gas to form gaseous impurities. In addition, the gaseous impurities also contain hydrogen cyanide. 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] PDS wet desulfurization method is a desulfurization method independently developed by my coun...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a comprehensive treatment method for coking desulfurization waste liquid, which solves the problems that the existing desulfurization waste liquid treatment process is complicated, and the produced crude ammonium sulfate cannot be sold due to low ammonium sulfate content and mixed components, causing secondary pollution, etc.

Images