Method for synergistically preparing magnesium ammonium phosphate by coupling steel slag-steel mill sintering desulfurization wastewater with CO2 in-situ sealing

Through the in-situ sealing method of slag-steel plant sintered desulfurization wastewater coupled to CO2, the problems of low CO2 capture efficiency and difficult wastewater treatment in steel plants are solved, and the efficient storage of CO2 and the deep treatment of wastewater are achieved, and the added value is produced The magnesium ammonium phosphate fertilizer has promoted the sustainable development of the steel industry.

CN119143099APending Publication Date: 2024-12-17KUNMING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411255070.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-09
Publication Date
2024-12-17

AI Technical Summary

Technical Problem

The prior art CO2 capture efficiency in steel plants is low, the steel slag treatment cost is high, and the sintered desulfurization wastewater treatment is difficult, and it is not able to effectively reduce CO2 emissions and wastewater salinity.

Method used

The in-situ sealing method of steel slag-steel plant sintered desulfurization wastewater is adopted. By reacting the steel slag in the reactor with sintered desulfurization wastewater with CO2, it generates ammonium magnesium phosphate, realizes CO2 storage and wastewater treatment, and at the same time reduces the ion concentration of wastewater, and produces additional production. Value of fertilizer.

Benefits of technology

It improves CO2 capture efficiency, reduces wastewater treatment costs, realizes the comprehensive treatment and resource utilization of waste gas, waste slag, and waste liquid, produces added value-added ammonium magnesium phosphate fertilizer, and reduces CO2 emissions and wastewater salinity.

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Abstract

The invention discloses a method for synergistically preparing magnesium ammonium phosphate by coupling steel slag-steel mill sintering desulfurization wastewater with CO2 in-situ sealing. The method comprises the following steps: crushing, screening and drying steel slag; putting the pretreated steel slag into a reaction kettle, adding sintering desulfurization wastewater, raising the temperature, and introducing CO2 into the reaction kettle for reaction; after the reaction is finished, discharging gas in the kettle, cooling to room temperature, performing solid-liquid separation on a reaction product, and drying a solid; adding Na2HPO4 and MgCl2 into the filtrate to react, carrying out solid-liquid separation, and drying the solid to obtain magnesium ammonium phosphate; according to the method, comprehensive treatment and recycling of waste gas-waste residue-waste liquid in the field of steel smelting can be achieved, the carbon emission of a steel plant and the salt content of the waste water are reduced, meanwhile, the follow-up treatment difficulty of the sintering desulfurization waste water is reduced, products with added value are produced, and recycling of resources is fully achieved.
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