Harmless treatment method for urban garbage incineration fly ash

A technology for incineration of fly ash and disposal method, which is applied in the direction of solid waste removal, etc., to achieve good economic benefits, excellent material, and the effect of being conducive to the utilization of resources and resources.

Active Publication Date: 2012-06-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of municipal waste incineration in order to overcome the problems of poor harmless effect of fly ash, narrow practical range and high cost which are common at home and abroad at present. Harmless disposal method of fly ash

Method used

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  • Harmless treatment method for urban garbage incineration fly ash
  • Harmless treatment method for urban garbage incineration fly ash
  • Harmless treatment method for urban garbage incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] figure 2 It is the harmless disposal process of municipal waste incineration fly ash of the present invention. Incineration fly ash is collected in the bag filter of the flue gas purification system of the municipal solid waste incineration plant. First of all, according to the flow chart, the collected fly ash is washed and pretreated, and the method is as follows: According to the flow chart, the fly ash and tap water are mixed at a ratio of 1:10, and after mixing, stir with a strong paddle for 20 minutes to promote soluble salts Fully dissolve. After washing with water, the collected solid ash is about 70% of the weight of the original fly ash. After pretreatment of fly ash after washing with water, the chlorine content of the original fly ash was reduced from 3.85% to 0.032%, which was lower than the 0.06% chlorine content requirement specified in the "General Portland Cement" product standard.

[0049] Then the washed mortar is subjected to a solid-liquid separ...

Embodiment 2

[0057] The bag dust-removing fly ash obtained in Example 1 is first subjected to the water washing pretreatment of the same working condition as in Example 1. After washing with water, the fly ash and the configuration solution are mixed at a ratio of 1:10, and the NaOH concentration of the configuration solution is 1mol / L. The temperature was 300°C, and the reaction time was 10 hours. After harmless treatment, the PH value dropped from 13.7 of the original configuration solution to 12.49, the heavy metal leaching solution of the fly ash was lower than the national standard, the dioxin degradation rate was 99.99%, and the specific surface area of ​​the fly ash after treatment was 36.3 m 2 / g, the adsorption capacity is 73.5 meq / 100g.

Embodiment 3

[0059] The bag dust-removing fly ash obtained in Example 1 is first subjected to the water washing pretreatment of the same working condition as in Example 1. After washing with water, the fly ash and the configuration solution are mixed at a ratio of 1:10, and the NaOH concentration of the configuration solution is 1mol / L. The temperature was 150°C and the reaction time was 12 hours. After harmless treatment, the PH value dropped from 13.7 in the original configuration solution to 12.95, the heavy metal leaching solution of the fly ash was lower than the national standard, the dioxin degradation rate was 40.6%, and the specific surface area of ​​the fly ash after treatment was 50.2 m 2 / g, the adsorption capacity is 85.2 meq / 100g.

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PUM

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Abstract

The invention discloses a harmless treatment method for urban garbage incineration fly ash. Due to the adoption of a treatment system and a method disclosed by the invention, heavy metals in incineration fly ash can be effectively stabilized and dioxin can be degraded; the leaching toxicity of heavy metals is fully accordant with the national standard; the toxicity of dioxin is removed by 99.9 percent; and meanwhile, the chloride ions in fly ash can be effectively removed, salt substances are recovered, and zero discharge of waste liquids is ensured. A process and the method have the remarkable characteristics of energy saving, environmental friendliness, remarkable economic benefit and remarkable social benefit; and meanwhile, the treated fly ash has novel physicochemical properties, canbe applied to the industries of environmental protection, construction and the like, and has application and popularization values.

Description

technical field [0001] The invention belongs to the technical field of harmless and resourceful utilization of solid waste, and in particular relates to a method for harmless disposal of urban waste incineration fly ash. Background technique [0002] The high concentration of heavy metals, dioxins and high content of soluble salts in the fly ash produced during the incineration process of municipal solid waste restricts its resource utilization. If it is directly landfilled, there will be potential secondary pollution. According to the "Life Waste Landfill Pollution Control Standard GB16889-2008" clearly stipulates: "The efficiency of the water content of the fly ash of domestic waste incineration is less than 30%, the content of dioxin is less than 3 ug TEQ / Kg and the leaching toxicity of heavy metals is lower than the corresponding standard value". The amount of fly ash produced after garbage incineration is generally 1% to 5% of the total mass of the original garbage. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
Inventor 金余其马晓军严建华池涌李晓东蒋旭光马增益黄群星
Owner ZHEJIANG UNIV
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