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Cement kiln calcining resource method for domestic waste burning fly ash

A domestic waste incineration and cement kiln technology, applied in cement production, etc., can solve the problems of high chlorine salt content in fly ash, difficult to use, and fly ash disposal, and achieve the effect of simple and practical technology, cost reduction, and emission reduction

Inactive Publication Date: 2008-05-21
TSINGHUA UNIV
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Problems solved by technology

[0004] Most of my country's waste incineration devices have not properly disposed of fly ash, which has affected the promotion and application of waste incineration technology to a considerable extent.
If my country uses high temperature to treat fly ash, the treatment cost is very high, and it is difficult to adopt at this stage. However, if cement or lime solidification is used, it will face the problems of high chlorine salt content in fly ash and poor fixation effect of heavy metals.

Method used

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  • Cement kiln calcining resource method for domestic waste burning fly ash

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Effect test

Embodiment 1

[0025] The incineration fly ash of a municipal solid waste incineration plant has a water content of 1.93%, a Cl element content of 17.96%, a Zn element content of 0.54%, a Pb element content of 0.23%, a Sn element content of 0.12%, and a Cu element content of 0.09%, Cr element content is 0.09%.

[0026] Mix water and incineration fly ash in water washing equipment according to the weight ratio of water: ash = 5:1, stir for 30 minutes, let stand for 2 hours, and then extract the supernatant to CO 2 In the reaction tank, the exhaust gas of the cement kiln is passed to control the CO 2 The ventilation volume is 1.4L (CO 2 ) / L (supernatant). The chlorine content of the washed fly ash was reduced from 17.96% to about 1% after plate and frame pressure filtration, and the heavy metal content and pH value of the supernatant reached the first-class standard for comprehensive sewage discharge after carbonation. After the washed fly ash and carbonic acid precipitate are dehydrated, t...

Embodiment 2

[0028] The incineration fly ash of a municipal solid waste incineration plant has a water content of 2.20%, a Cl element content of 23.11%, a Zn element content of 0.62%, a Pb element content of 0.39%, a Sn element content of 0.11%, and a Cu element content of 0.11%, Cr element content is 0.07%.

[0029] Mix water and incineration fly ash in water washing equipment according to the weight ratio of water: ash = 10:1, stir for 15 minutes, let stand for 2 hours, and then extract the supernatant to CO 2 In the reaction tank, the exhaust gas of the cement kiln is passed to control the CO 2 The ventilation volume is 2.0L (CO 2 ) / L (supernatant). The chlorine content of the washed fly ash was reduced from 23.1% to about 1.1% after plate and frame pressure filtration, and the heavy metal content and pH value of the supernatant reached the first-class standard for comprehensive sewage discharge after carbonation. The washed fly ash and carbonic acid precipitate are dehydrated and se...

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Abstract

The invention discloses a municipal solid waste incineration fly ash cement kiln calcining resource recovery method, which belongs to the solid waste treatment and disposal technical field. Firstly, the washing pretreatment is implemented on municipal solid waste incineration fly ash to dissolute alkali metal chloride, then supernatant and washed fly ash are obtained through the natural sedimentation. Waste tail gas is pumped in the supernatant, CO2 in which is used to realize the carbonate neutralization and the heavy metal co-sedimentation to reach to the first grade of the national sewage comprehensive discharge standard. The washed fly ash and carbonate are pressed and filtered together for the dehydration. A filter cake is used as cement raw to be input in a cement kiln for the calcining to produce cement clinker. The invention can realize the harmless resource recovery treatment of incineration simply and economically.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and disposal, and in particular relates to a method for recycling domestic waste incineration fly ash and cement kiln calcination. Background technique [0002] In recent years, the amount of municipal solid waste generated in my country has increased rapidly, which has become an important problem restricting urban development. The proportion of incineration treatment in my country's urban domestic waste treatment has also increased year by year, reaching 10% in 2005, an increase of nearly 5 times compared with 2000, and the amount of fly ash produced by domestic waste incineration has also increased rapidly. Domestic waste incineration fly ash has dual hazard characteristics of high heavy metal leaching concentration and high dioxin toxicity equivalent. my country's "National Hazardous Waste List" has listed solid waste incineration fly ash as hazardous waste number HW18. [0003] ...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/28
CPCY02P40/10
Inventor 金宜英凌永生李欢聂永丰朱孟哲
Owner TSINGHUA UNIV
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