Method and system for preparing dry desulfurization ash into desulfurization gypsum by using social waste acid

Abstract

The invention provides a method and system for preparing dry desulfurization ash into desulfurization gypsum by using social waste acid. The method for preparing the dry desulfurization ash into the desulfurization gypsum by using the social waste acid comprises the steps that water and the dry desulfurization ash are mixed, the mixture is stirred to prepare a dry desulfurization ash solution; thesocial waste acid is added to the dry desulfurization ash solution, oxygen is introduced, and the mixture is stirred to perform an oxidation reaction; a mixed solution is added to a solid-liquid separation device for solid-liquid separation; solids separated by solid-liquid separation enters a distillation device; solid-liquid separation is performed in the distillation device, and the distilledsolids are used as the desulfurization gypsum. The conversion rate of CaSO3 converted into the desulfurization gypsum CaSO4 in the dry desulfurization ash is over 99%, the conversion time is less thanor equal to 1.5 hours, and the requirements of JC / T2074-2011 "Fume Gas Desulfurization Gypsum" are met. The use of the social waste acid is fully utilized to achieve the purpose of using waste to treat waste; the problem of calcium sulfite conversion is solved, and simultaneously the problem of calcium chloride and calcium nitrite in the desulfurization ash is solved; and the problem of secondarypollution caused by sulfur dioxide emissions generated in the reaction process is solved.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, in particular to a method and system for preparing desulfurized gypsum from dry desulfurized ash of social waste acid. Background technique [0002] In the process of industrial production such as iron and steel, the generated flue gas contains powder (smoke) dust, sulfur oxides (SO X ), nitrogen oxides (NO X ) and CO 2 Among them, the semi-dry desulfurization process adopted by the sulfur oxide emission control equipment, its by-product is dry desulfurization ash, the main components of dry desulfurization ash are calcium sulfite, calcium carbonate, etc., due to calcium sulfite It is easy to decompose, so it is not used as a raw material for building materials, and the country has no standards for using dry desulfurization ash as building materials. At present, the more common treatment methods are stacking or landfilling, which does not meet the national requirements for solid w...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method and system for preparing desulfurized gypsum from dry desulfurized ash of social waste acid, which mainly solves the existing technical problems that it is difficult to industrialize the preparation of desulfurized gypsum from dry desulfurized ash, and the production of sulfur dioxide during the conversion process is harmful to the environment. Technical problems of secondary pollution, consumption of social waste acid

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