Household garbage incineration flying dust electrode melting treatment and resourceful utilization method

Abstract

The invention relates to a household garbage incineration dust electrode melting treatment and resourceful utilization method. The method comprises the steps of sending flying dust and auxiliaries after the flying dust and auxiliaries evenly stirred into an electrode melting furnace, under the conditions of 800-1,500 DEG C, conducting standing for 10-100 min, making heavy melted liquid precipitate to the bottom of the melting furnace, and conducting water quenching to form a vitrification product; making high boiling point substances in light melted liquid condensed at the top of a cold furnace or a mixed material layer, and conducting burying after draining condensed liquid; delivering low boiling point substances in the light melted liquid to a tail gas purifying system. During continuous work, a mode of a pressure furnace is adopted to make the system run at a low temperature, and energy conservation and consumption reducing are effectively achieved; unreacted Ca(OH)2 contained in the mixed material layer adopted by a cold heading mode can be used as an acid removal agent to adsorb pollutants like acidic gas and heavy metal in flue gas, and therefore the flue gas is preliminarily purified; meanwhile, the lowest temperature at the top of the material layer can reach 200 DEG C or above, volatilization of low boiling point substances is drastically reduced, and the flue gas treatment system is effectively prevented from being corroded or hardened by acidic gas.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and disposal, and in particular relates to an electrode melting treatment and resource utilization method of domestic waste incineration fly ash. Background technique [0002] Domestic waste incineration fly ash is a kind of off-white or dark gray fine powder, with low moisture content, generally rod-shaped, polygonal, cotton-like, spherical and other irregular shapes, uneven particle size, high porosity and large specific surface area specialty. Fly ash is rich in high concentration of chlorine salts, high content of heavy metals and dioxins that are easily leached, and is listed as hazardous waste by countries all over the world (China, code HW18). In recent years, a variety of fly ash disposal technologies have been researched at home and abroad, including solidification and stabilization landfill, separation and extraction, heat treatment such as sintering and melting, and other...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the defects of high processing cost, high energy consumption, and unfavorable promotion in the fly ash melting technology, the present invention proposes a method for melting the fly ash electrode of domestic waste incineration and utilizing it as a resource. The method and system adopt " The design of "cold furnace top" and "press furnace" can effectively reduce the volatilization of low boiling point substances, simplify the flue gas treatment process, reduce the energy consumption of the treatment, and finally obtain vitrified products under the premise of ensuring the melting effect

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