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A method for melting and processing waste incineration fly ash

A technology for waste incineration fly ash and a treatment method, applied in the field of environmental engineering, can solve the problems of high cost of fly ash melting treatment, leaching of heavy metals in slag, and easy clogging of pipelines by fly ash, so as to save the cost of melting treatment and avoid two The effect of secondary pollution and high resource utilization

Active Publication Date: 2018-03-13
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The application provides a method for melting and processing waste incineration fly ash, which solves or partially solves the problem that the fly ash of the fly ash melting processing technology in the prior art is easy to block the pipeline during the transportation process, and the cost of fly ash melting processing is high, causing secondary pollution. The phenomenon is prominent, and the technical problem of leaching risk of heavy metals in the slag has been realized to avoid the blockage of the pipeline during the transportation of the fly ash, solve the low calorific value of the fly ash and the easy volatilization of heavy metals, the treatment effect is good and the cost is low, and there is no secondary pollution. High technical effect of resource utilization

Method used

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  • A method for melting and processing waste incineration fly ash

Examples

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Effect test

Embodiment example 1

[0054] Add 8 tons of tap water to 1 ton of waste incineration fly ash, mix evenly, stir for 50 minutes, use a plate and frame filter press to filter and air-dry, and mix the air-dried treated fly ash with 111kg of urban municipal dewatered sludge with a moisture content of 75%. Mix evenly to form a fly ash sludge mixture, add phosphogypsum and cement to the fly ash sludge mixture, the particle size of the phosphogypsum is 200 mesh, the content of calcium oxide in the phosphogypsum is 35%, the cement is ordinary Portland cement, The mass of phosphogypsum and cement is 247kg. After mixing evenly, it is compressed into a solidified body. The solidified body is moved into a plasma melting furnace, kept at 1000°C for 30 minutes, water-quenched and formed, and the tail gas is discharged after desulfurization and denitrification treatment.

Embodiment example 2

[0056] Add 10 tons of tap water to 1 ton of waste incineration fly ash, mix evenly, stir for 60 minutes, use a centrifuge to dehydrate and then air-dry, and mix the air-dried treated fly ash with 100kg of urban municipal dewatered sludge with a moisture content of 80% to form Fly ash sludge mixture, add phosphogypsum and cement to the fly ash sludge mixture, the particle size of phosphogypsum is 150 mesh, the content of calcium oxide in phosphogypsum is 30%, the cement is ordinary portland cement, phosphogypsum and cement The mass of each is 220kg, and after being stirred evenly, it is compressed into a solidified body. The solidified body is moved into a plasma melting furnace, kept at 1200°C for 30 minutes, water-quenched and formed, and the tail gas is discharged after desulfurization and denitrification treatment.

Embodiment example 3

[0058] Add 12 tons of tap water to 1 ton of waste incineration fly ash, mix evenly, stir for 70 minutes, use a plate and frame filter press to filter and air-dry, and mix the air-dried processed fly ash with 90.9kg of urban municipal dewatering sewage with a moisture content of 80%. Mix the mud evenly to form a fly ash sludge mixture, add phosphogypsum and cement to the fly ash sludge mixture, the particle size of the phosphogypsum is 100 mesh, the content of calcium oxide in the phosphogypsum is 33%, and the cement is ordinary Portland cement , The mass of phosphogypsum and cement is 198kg. After mixing evenly, it is compressed into a solidified body. The solidified body is moved into a plasma melting furnace, kept at 1300°C for 30 minutes, water quenched and formed, and the tail gas is discharged after desulfurization and denitrification treatment.

[0059] Through the above three embodiments, it can be concluded that the melting treatment method for waste incineration fly as...

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Abstract

The invention relates to a melting treatment method for waste incineration flying ash, and belongs to the technical field of environmental engineering. The treatment method comprises the following steps of carrying out pretreatment on the waste incineration flying ash to form treated flying ash; uniformly mixing the treated flying ash with sludge to form a mixture of the flying ash and the sludge; carrying out solidification and stabilization on the mixture of the flying ash and the sludge to form a solidified body; and carrying out melting treatment on the solidified body. The treatment method can effectively solve the problems that the caloric value in the flying ash is relatively low, and heavy metals in the flying ash are liable to volatilize, so that pipeline blockage in a flying ash conveying process is avoided; and the melting treatment method is good in treatment effect, is low in cost, is free from secondary pollution, and is high in resource utilization.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a melting treatment method for waste incineration fly ash. Background technique [0002] In recent years, domestic waste incineration has attracted more and more attention due to its characteristics of large reduction and high resource utilization. However, toxic fumes, bottom slag and fly ash will be produced during the waste incineration process, which also restricts the popularization and application of this technology. Therefore, waste incineration pollution control has become a research hotspot in the field of environmental engineering. Taking waste incineration fly ash as an example, its output is about 2%-5% of the mass of domestic waste. Fly ash not only contains high concentrations of heavy metal pollutants such as Pb, Hg, Cu, Cd, Zn, Ni and Cr, but also Contains organic pollutants such as dioxin, therefore, waste incineration fly ash is included in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 李江山薛强王平张亭亭孟思明陈亿军许越王国菲
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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