Method for reducing coal ash stacking pollution of thermal power plant

By pretreating fly ash, laying adsorption matrix, and directional leaching acid treatment, the problems of dust and mercury migration during fly ash storage have been solved, achieving effective pollution control and sustainable resource utilization.

CN121649205APending Publication Date: 2026-03-13SHAANXI XIN YUAN CLEAN ENERGY CO LTD
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Patent Information

Application Number
CN202511624003.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-07
Publication Date
2026-03-13

AI Technical Summary

Technical Problem

Existing technologies cannot effectively suppress dust pollution and the migration of heavy metal mercury during fly ash storage, especially the migration of mercury into the surrounding environment, leading to air and soil pollution.

Method used

By pretreating fly ash with sodium dihydrogen phosphate solution before stacking, laying an adsorption matrix at the bottom of the stack, and spraying it with directional leaching acid solution and sodium hydroxide solution on the surface, combined with the treatment of the adsorption matrix with mercaptoacetic acid and calcium sulfate, mercury is fixed and a shell is formed, reducing dust.

Benefits of technology

It effectively reduces mercury migration and dust pollution during fly ash storage, meets industrial wastewater mercury discharge standards, and promotes the resource utilization of fly ash.

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Abstract

The invention discloses a method for reducing stacking pollution of coal ash of a thermal power plant, and belongs to the technical field of coal ash treatment of the thermal power plant, and the method comprises the following specific operation steps: (1) coal ash pretreatment: firstly, uniformly mixing the coal ash with a sodium dihydrogen phosphate solution to obtain pretreated coal ash; (2) fly ash stacking: laying a layer of adsorption matrix on the ground, and stacking the pretreated fly ash on the adsorption matrix to form a fly ash pile; and (3) innocent treatment: spraying the fly ash pile with a directional leaching acid solution, and spraying a sodium hydroxide solution on the surface of the fly ash pile to complete the treatment of the fly ash pile body of the thermal power plant. The problems of heavy metal migration pollution and flying dust pollution in the fly ash stacking process are solved.
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