Method for treating waste incineration fly ash by electric melting

A waste incineration fly ash and treatment method technology, which is applied in the field of electrofusion treatment for the decomposition of dioxin and the stable solidification of heavy metals, can solve the problems of high cost, high content and difficult disposal of fly ash fusion, and achieves convenient operation, Good heat storage and heat preservation performance, high efficiency effect

Inactive Publication Date: 2010-11-17
刘阳生 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of this technology is that the washing liquid contains a lot of salts and heavy metals, which is difficult to dispose of
[0008] (4) Plasma melting of fly ash: using plasma to generate high temperature, in a high temperature environment above 1300-1500 °C, fly ash is continuously melted, and the high-temperature glass liquid formed at the same time is continuously discharged from the plasma reactor ( into the water quenching system), the heat in the high-temperature molten glass is taken away, making the disposal cost of fly ash melting very high
This method does not have any disposal or decomposition effect on organic pollutants in fly ash

Method used

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  • Method for treating waste incineration fly ash by electric melting
  • Method for treating waste incineration fly ash by electric melting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 As shown, the fly ash, quartz sand and soda ash are uniformly mixed according to the weight ratio of 90:8:2 to obtain the mixture 1, which is put into the glass electric melting furnace 2 and fully melted at 1250-1500°C. After 8-10 hours, the electric The glass liquid level in the furnace is stable. A small amount of dust-laden flue gas 3 is produced during the melting process, which is dedusted by the bag filter 4, and the purified flue gas is discharged into the atmosphere through the induced draft fan 5 and the chimney 6.

[0026] The mixture 1 is added to the electric glass melting furnace 2 to form a high-temperature glass liquid 7, which is discharged into the water quenching system 8 from the middle of the electric glass melting furnace 2, and the glass slag 9 is obtained after quenching with cold water.

Embodiment 2

[0028] Such as figure 1 As shown, the fly ash, quartz sand and lime are uniformly mixed according to the weight ratio of 90:2:8 to obtain the mixture 1, which is put into the glass electric melting furnace 2 and fully melted at 1250-1500°C. After 8-10 hours, the mixture is The glass liquid level in the furnace is stable. A small amount of dust-laden flue gas 3 is produced during the melting process, which is dedusted by the bag filter 4, and the purified flue gas is discharged into the atmosphere through the induced draft fan 5 and the chimney 6.

[0029] The mixture 1 is added to the electric glass melting furnace 2 to form a high-temperature glass liquid 7, which is discharged into the water quenching system 8 from the middle of the electric glass melting furnace 2, and the glass slag 9 is obtained after quenching with cold water.

Embodiment 3

[0031] Such as figure 1 As shown, the fly ash, quartz sand and soda ash are uniformly mixed according to the weight ratio of 92:5:3 to obtain the mixture 1, which is put into the glass electric melting furnace 2 and fully melted at 1250-1500°C. After 8-10 hours, the electric The glass liquid level in the furnace is stable. A small amount of dust-laden flue gas 3 is produced during the melting process, which is dedusted by the bag filter 4, and the purified flue gas is discharged into the atmosphere through the induced draft fan 5 and the chimney 6.

[0032] The mixture 1 is added to the electric glass melting furnace 2 to form a high-temperature glass liquid 7, which is discharged into the water quenching system 8 from the middle of the electric glass melting furnace 2, and the glass slag 9 is obtained after quenching with cold water.

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Abstract

The invention discloses a method for treating waste incineration fly ash by electric melting. The method comprises the following steps of: uniformly mixing the fly ash, quartz sand and an alkaline agent according to a weight ratio of fly ash: quartz sand: alkaline agent of (90-99):(1-10):(1-10), wherein the quartz sand and the alkaline agent are used as a melt preparation; then adding a mixture into a glass electric melting furnace; fully melting the mixture to form a glass metal at a high temperature of between 1,250 and 1,500 DEG C; and after performing water quenching by using cold water, cooling the glass metal at the room temperature to form glass dregs. In the method, the quartz sane and the alkaline agent (such as lime or sodium carbonate) are added to vitrify the flay ash, dioxin and other organic pollutants in the fly ash are decomposed at a high temperature, heavy metals such as copper, zinc, lead and the like are cured and stabilized after entering a glass crystal lattice, and the extraction concentration of the heavy metals is far lower than a standard limit value of 'Identification Standard for Hazardous Wastes-Identification for Extraction Toxicity (GB 5085.3-2007). The fly ash is transformed into inert solid waste in a glassy state.

Description

technical field [0001] The invention relates to a harmless treatment method for waste incineration fly ash, in particular to an electrofusion treatment method for decomposing dioxin and stably solidifying heavy metals in waste incineration fly ash. Background technique [0002] With the acceleration of urbanization and the increasing shortage of land resources, waste incineration technology has become one of the main means of dealing with domestic waste in large cities. [0003] After the incineration flue gas is purified, a large amount of incineration fly ash is produced, which is equivalent to 5% (mechanical grate incinerator) or even more than 20% (fluidized bed incinerator) of the amount of primary waste. Fly ash contains high concentrations of toxic pollutants such as heavy metals and dioxins. According to my country's hazardous waste list, fly ash belongs to the category of hazardous waste and should be solidified and stabilized. [0004] At present, the fly ash disp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C6/04
Inventor 袁利民刘阳生
Owner 刘阳生
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