Method for efficient solidification and synergistic carbon sequestration of heavy metals in waste incineration fly ash

Abstract

The invention relates to a waste gas treatment technology, and aims to provide a method for efficient solidification and synergistic carbon sequestration of heavy metals in waste incineration fly ash. Comprising the following steps: carrying out three-stage countercurrent washing on fly ash, carrying out filter pressing treatment, and drying; adding the ground fly ash into a carbon sequestration bin with stirring equipment, and then adding water; introducing flue gas discharged by a waste incineration power plant under a stirring condition; the carbonation reaction condition is judged according to the concentration change of carbon dioxide in the discharged gas; and dehydrating and drying the fly ash mixture at normal temperature to obtain a carbon sequestration product. According to the method, dioxin in the fly ash can be degraded while heavy metal in the fly ash is solidified, mineralization trapping of carbon dioxide is achieved, and the fly ash with resource utilization conditions is obtained while waste is treated with waste; no additive is added, and the treatment cost is low; the process flow is simple, no harmful substance is generated in the process, and the method is low-carbon and environment-friendly; the device can be directly installed in a waste incineration power plant, and semi-automatic production is achieved.

Description

technical field [0001] The invention relates to a waste gas treatment technology, in particular to a harmless disposal of municipal solid waste incineration fly ash and a carbon dioxide capture technology. The fly ash is used to efficiently solidify heavy metals and cooperate to efficiently capture and seal carbon dioxide. Background technique [0002] With the improvement of people's living standards, the amount of garbage generated is also increasing, of which incineration accounts for more than half of the domestic garbage removal. However, the incineration of domestic waste will produce a large amount of fly ash. Because the fly ash contains a large amount of heavy metals, chloride salts and dioxins, it is clearly identified as hazardous waste by the relevant laws and regulations of various countries, and it needs to be disposed of harmlessly before it can enter the hazardous waste landfill plant. [0003] At present, the more mature disposal methods are mainly solidifi...

AI Technical Summary

Problems solved by technology

However, this method has low carbonation efficiency, poor solidification effect of heavy metals, and cannot achieve the degradation of dioxins in fly ash. Dioxins cannot be degraded, which will always affect the resource utilization of fly ash after disposal.

Images