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Method for stabilizing treatment of refuse burning fly ash by using accelerated carbonation process

A technology for waste incineration fly ash and stabilization treatment, applied in the field of hazardous solid waste treatment, can solve the problems of waste impact, lack of stabilizing agents that can be used on a large scale, and achieve the effect of harmless

Inactive Publication Date: 2007-05-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the containment is broken, the waste can re-enter the environment causing unforeseen impacts
For conventional chemical stabilization methods, there is a lack of economical and reliable stabilizing agents that can be used on a large scale, and the introduced chemical agents may also introduce another dangerous component

Method used

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  • Method for stabilizing treatment of refuse burning fly ash by using accelerated carbonation process
  • Method for stabilizing treatment of refuse burning fly ash by using accelerated carbonation process

Examples

Experimental program
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Effect test

Embodiment 1

[0030]The experimental material used is urban waste incineration fly ash collected by a semi-dry method in a waste incineration site in the south, with a moisture content of 3%. In order to ensure that the incineration fly ash is fresh and does not come into contact with the air for a long time, the fly ash taken during sampling is the fly ash produced on the same day. After being collected with a sealed device, the air in the sealed device is drained and stored in a cool place. Incineration fly ash samples were analyzed by XRF-1700 X-ray fluorescence spectrometer. The fly ash samples were subjected to the leaching toxicity test according to the "National Standard of the People's Republic of China for Solid Waste Leaching Toxicity Leaching Method" (GB5086.1-1997), and the concentration of heavy metals in the leachate was measured by plasma emission spectrometry (ICP).

[0031] Table 1 Changes of main chemical composition of fly ash before and after carbonation

[0032] ...

Embodiment 2

[0044] The experimental material used is municipal waste incineration fly ash collected by a semi-dry method in a waste incineration site in the south, and the leaching concentration of Pb is 12.94mg / L. in pure CO 2 Next, add 10% water, and operate and treat with a simplified device (as shown in Figure 4) for 24 hours. The concentration of Pb in the leaching solution is 0.199 mg / L, which meets the toxicity identification standard and can be safely landfilled.

Embodiment 3

[0046] The experimental material used is municipal waste incineration fly ash collected by a semi-dry method in a waste incineration site in the south, and the leaching concentration of Pb is 12.94mg / L. in pure CO 2 Next, add 20% water, and use a simplified device (as shown in Figure 4) to operate and process for 24 hours. The concentration of Pb in the leaching solution is 0.081mg / L, which meets the toxicity identification standard and can be safely landfilled.

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Abstract

The carbonization speeding up technique for stabilizing the heavy metals in the burnt fly ash belongs to the field of hazardous solid wastes treatment. Filling 10-50% of water into the fly ash of the burnt residue and making it into the fly ash with certain ratio of water, putting it into a shakable or a turnover container, then let the burnt fly ash have carbonization reaction with CO2 intermittently or continuously input. Small portion of heavy metal and large portion of limestone in the burnt fly ash carbonize with CO2 and turn into carbonate material that can last stably in the natural world. The carbonization process promotes the stabilization of the burnt fly ash, with water against limestone equaling to 20%, reducing Pb intensity to 0.081mg / 1. Besides, the burnt fly ash absorbs CO2 well, with dried burnt fly ash can absorb CO2 3% of its own weight. The invention is low in cost and feasible for mechanical operation.

Description

technical field [0001] The invention relates to a method for stabilizing heavy metals in incineration fly ash by using accelerated carbonation technology, and belongs to the technical field of hazardous solid waste treatment. Background technique [0002] At present, a large amount of garbage is incinerated every year in our country. my country's current incineration capacity is about 10,000 t / d, accounting for 2.5% of the total waste disposal. According to the ash production rate of 3%, the annual output of fly ash is more than 100,000 t. Due to the complex composition of urban waste, a large amount of toxic substances are enriched in the incineration fly ash, especially the heavy metals in the waste, such as Pb, Cd, Zn and Cu, etc. At the same time, incineration will also change the chemical form of some heavy metals , possibly transforming it into a more migratory or ecotoxic form of matter. Although the incineration and dedusting devices at home and abroad have effecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/00B09B3/00
Inventor 蒋建国陈懋喆许鑫张妍
Owner TSINGHUA UNIV
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