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A method for harmless treatment of dioxin in waste incineration fly ash

A technology for waste incineration fly ash and harmless treatment, which is applied in the field of comprehensive utilization of solid waste resources, can solve the problems of low efficiency, secondary environmental pollution, and high cost, and achieves the effect of reducing costs and avoiding re-synthesis.

Active Publication Date: 2020-08-28
UNIV OF SCI & TECH BEIJING
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  • Abstract
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AI Technical Summary

Problems solved by technology

Chinese patent CN107159678A discloses a dioxin control method in the iron ore sintering process of co-processing garbage fly ash. The method is to mix and granulate garbage fly ash, flammable solid fuel and sludge, and dry to obtain garbage fly ash After the iron ore sintering raw material is granulated, it is mixed with the pellets containing garbage fly ash, and then ignited and sintered after the material is distributed. This method realizes the effective consolidation of garbage fly ash, but the degradation rate of dioxin Low, causing secondary pollution to the environment
Chinese patent CN107338358A discloses a method for removing heavy metals and dioxins from incineration fly ash at the same time. The invention includes: the method is to smelt incineration fly ash in a molten pool melting device to obtain flue gas and metal phase, Purify the flue gas to obtain dust and purified tail gas. The dust is returned to the molten pool smelting device to continue smelting and converting into slag. This method removes heavy metals and dioxins from waste incineration fly ash, but the process is relatively long. high energy consumption
[0005] In summary, there are problems such as low efficiency, high cost, high energy consumption, and long process flow in the harmless disposal of dioxins in waste incineration fly ash. Because there is no alkaline earth metal oxidation to solidify chlorine elements, and there is no flue gas quenching measure, the flue gas The high concentration of chlorine elements in the medium and the re-synthesis of dioxin lead to excessive emission of flue gas

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  • A method for harmless treatment of dioxin in waste incineration fly ash

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Experimental program
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Effect test

Embodiment 1

[0028] 30wt% of waste incineration fly ash, 40wt% of waste glass powder, 15wt% of pickling sludge and 15wt% of dolomite powder are uniformly mixed to obtain a mixture, and pressed at 10MPa to obtain a compact. The compact is heated at 1000°C for 60 minutes, the dolomite is decomposed and the glass melt is foamed, and then the temperature is lowered to 500°C and annealed for 60 minutes to obtain foam glass. Then raise the temperature to 800° C. for nucleation and crystallization heat treatment for 30 minutes, then cool down to room temperature with the furnace to obtain a foamed glass-ceramic product. In the process of melting and foaming, chlorine atoms react with calcium oxide and magnesium oxide and solidify in the glass melt, and then solidify in the foamed glass-ceramic after subsequent annealing, nucleation and crystallization, which reduces the dioxin synthesis in the flue gas. chlorine content. The flue gas is subjected to rapid cooling treatment, and the flue gas is c...

Embodiment 2

[0030] 33wt% of waste incineration fly ash, 42wt% of waste glass powder, 12wt% of pickling sludge and 13wt% of dolomite powder are uniformly mixed to obtain a mixture, which is pressed at 15MPa to obtain a compact. The compact was heated at 1010°C for 58 minutes, the dolomite was decomposed and the glass melt was foamed, and then the temperature was lowered to 510°C and annealed for 57 minutes to obtain foam glass. Then raise the temperature to 795° C. for nucleation and crystallization heat treatment for 32 minutes, and then cool to room temperature with the furnace to obtain a foamed glass-ceramic product. During the melting and foaming process, chlorine atoms react with calcium oxide and magnesium oxide and solidify in the glass melt, and then solidify in the foamed glass-ceramics through subsequent annealing, nucleation and crystallization, which reduces the dioxin synthesis in the flue gas. chlorine content. The flue gas is subjected to quenching treatment, and the flue ...

Embodiment 3

[0032] 36wt% of waste incineration fly ash, 44wt% of waste glass powder, 9wt% of pickling sludge and 11wt% of dolomite powder are uniformly mixed to obtain a mixture, which is pressed at 20MPa to obtain a compact. The compact was heated at 1020°C for 56 minutes, the dolomite was decomposed and the glass melt was foamed, and then the temperature was lowered to 520°C and annealed for 54 minutes to obtain foam glass. Then raise the temperature to 790° C. for nucleation and crystallization heat treatment for 34 minutes, and then cool down to room temperature with the furnace to obtain a foamed glass-ceramic product. During the melting and foaming process, chlorine atoms react with calcium oxide and magnesium oxide and solidify in the glass melt, and then solidify in the foamed glass-ceramics through subsequent annealing, nucleation and crystallization, which reduces the dioxin synthesis in the flue gas. chlorine content. The flue gas is subjected to rapid cooling treatment, and t...

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Abstract

The invention discloses a harmless treatment method of garbage incineration fly ash dioxin, and belongs to the field of solid waste treatment and resource utilization. The method is characterized in that the garbage incineration fly ash is used as major raw materials to be mixed with waste glass powder, acid washing sludge and dolomite powder; shape pressing is performed; foam micro crystal glassis prepared through high-temperature fusion; meanwhile, dioxin in the fly ash is subjected to pyrolysis; chlorine atoms and alkaline earth metal oxides react to cure in the foam micro crystal glass; the generated smoke gas is fast cooled to the temperature of 200 DEG C or below through a sharp cooling device; and the synthesis of the dioxin again by residual chlorides is avoided. The harmless treatment and the high-value utilization in foam thermal insulation fireproof material of the garbage incineration fly ash dioxin can be realized; and the advantages of simple process and green and environmental-friendly effects are achieved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste resources, and specifically discloses a method for harmlessly treating dioxins in waste incineration fly ash. Background technique [0002] Municipal solid waste incineration has been widely used in Europe, America, Japan and other developed countries. In 1977, Olie and others were the first to detect dioxins in the fly ash after garbage incineration, and people have paid more and more attention to the problem of dioxin pollution caused by garbage incineration. The newly revised "National Hazardous Waste List" in 2016 also clearly listed fly ash as a hazardous waste numbered HW18, and its hazardous characteristic is toxicity. Fly ash is included in the "National Hazardous Waste List" because: before the fly ash is captured, it is easy to enrich pollutants such as dioxins and heavy metals in the flue gas. At the same time, the chlorine content of fly ash is generally more t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C11/00C03B19/08
CPCC03B19/08C03C11/00
Inventor 张深根赵世珍刘波
Owner UNIV OF SCI & TECH BEIJING
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