Method for implementing co-production of ammonium sulfate from ADC foaming agent wastewater by extracting hydrazine hydrate

Abstract

The invention relates to a method for coproducing ammonium sulfate from wastewater, in particular to a method for implementing co-production of ammonium sulfate from ADC foaming agent wastewater by extracting hydrazine hydrate. The method comprises the following steps that after being preheated step by step by condensate water with each effect, hydrazine hydrate coarse solution enters evaporator with each effect in parallel to be heated and evaporated; after settling and being pulped, saline-alkali pulp discharged by evaporator with each effect through a pipeline is subjected to centrifugal dewatering to obtain saline-alkali slags; centrifugal mother liquid is settled to obtain clear liquid returned to a hydrazine hydrate coarse solution storage tank; the saline-alkali slags are pulped by saturated liquid and are respectively made into salt pulp and alkali pulp by multiple gravity fractionations; and the salt pulp and alkali pulp are respectively subjected to centrifugal dewatering to obtain salt slags and alkali slags. According to the invention, the process is unique and the ADC foaming agent production wastewater only contains a mass of ammonium sulfate, so that the aim of treating the wastewater pollution of an ADC foaming agent is fulfilled.

Description

technical field [0001] The invention relates to a method for co-producing ammonium sulfate from waste water, in particular to a method for purifying hydrazine hydrate to realize the co-production of ammonium sulfate from ADC foaming agent waste water. Background technique [0002] Application number 03132081.3, date of application 2003.07.15, name is recovery method and device for serious pollutants in the production process of ADC foaming agent, application number 200510017886.1, date of application 2005.08.12, name is synthesis process of biurea; the above two patents The technology uses hydrochloric acid or hydrogen chloride gas instead of sulfuric acid to produce ADC foaming agent, and the obtained wastewater contains two inorganic salts of sodium chloride and ammonium chloride, and then recovers the above two salts from the wastewater to achieve the purpose of wastewater treatment; application number 200610085350.8 , application date 2006.06.12, name is ADC blowing agen...

AI Technical Summary

Problems solved by technology

[0002] Application number 03132081.3, date of application 2003.07.15, name is recovery method and device for serious pollutants in the production process of ADC foaming agent, application number 200510017886.1, date of application 2005.08.12, name is synthesis process of biurea; the above two patents The technology uses hydrochloric acid or hydrogen chloride gas instead of sulfuric acid to produce ADC foaming agent, and the obtained wastewater contains two inorganic salts of sodium chloride and ammonium chloride, and then recovers the above two salts from the wastewater to achieve the purpose of wastewater treatment; application number 200610085350.8 , application date 2006.06.12, name is ADC blowing agent wastewater treatment method and integrated device, this patented technology does not improve the production process of ADC foaming agent, only achieves the purpose of wastewater discharge through terminal treatment, and does not release ADC Foaming agent production wastewater is converted into an aqueous solution containing only ammonium sulfate, and the subsequent treatment is complicated

There is currently no method to overcome the above drawbacks