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Detoxifying method of dioxin and heavy metal in waste incineration fly ash

A technology for waste incineration fly ash and heavy metals, applied in chemical instruments and methods, transportation and packaging, solid waste removal, etc., can solve dioxin and heavy metal pollution, cannot solve dioxin pollution problem, cannot eliminate dioxin pollution, etc.

Inactive Publication Date: 2017-06-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

There are two disadvantages in cement solidification: ① After dioxin is desorbed from fly ash in the cement production process, it is enriched in dust removal ash after the cement kiln flue gas purification system, which cannot solve the pollution problem of dioxin; ② cement The average leaching rate of heavy metal ions in the cured body: chromium 34.9%, nickel 20.8%, arsenic 14.8%, lead 18.7%, still higher than the limit of GB30485-2013 and HJ662-2013
Due to the re-synthesis of dioxins in the range of 300-500°C during the flue gas cooling process, dioxin pollution cannot be eliminated
[0007] The existing anti-seepage landfill, cement solidification and melting solidification disposal methods of waste incineration fly ash cannot effectively solve the pollution problems of dioxin and heavy metals in fly ash at the same time

Method used

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  • Detoxifying method of dioxin and heavy metal in waste incineration fly ash

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Experimental program
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Effect test

Embodiment 1

[0027] Mix the waste incineration fly ash, waste incineration bottom ash, pickling sludge and quartz sand evenly, and the contents (wt.%) of the incineration fly ash, waste incineration bottom ash, pickling sludge and quartz sand in the mixture are 5% respectively. , 5%, 30% and 60%, (CaO+MgO):(SiO 2 +Al 2 O 3 ) molar ratio of 0.1. The mixture was heated to 1450°C and melted to obtain a melt, which was cooled to obtain a glass body. Using high temperature pyrolysis to detoxify dioxin and alkali oxides (CaO+MgO) in the mixture to solidify chlorine element, the concentration of dioxin in the exhaust gas is 0.1TEQng / m 3 , much lower than the GB31574-2015 limit (0.5TEQng / m 3 ). Utilize SiO in solid waste 2 and Al 2 O 3 As the heavy metals in the network solidification, the leaching concentration of Cr is 0.13 mg / L, the leaching concentration of Pb is 0.11 mg / L, the leaching concentration of Cd is 0.12 mg / L, the leaching concentration of Ni is 0.12 mg / L, and the leaching co...

Embodiment 2

[0029] Mix the waste incineration fly ash and quartz sand evenly, the contents (wt.%) of the waste incineration fly ash and quartz sand in the mixture are 80% and 20% respectively, (CaO+MgO):(SiO 2 +Al 2 O 3 ) molar ratio of 1.0. The mixture was heated to 1350°C and melted to obtain a melt, which was cooled to obtain a glass body. Utilize pyrolysis to detoxify dioxins and the alkaline oxides (CaO+MgO) in the mixture to solidify chlorine element, and the concentration of dioxins in the exhaust gas is 0.4TEQng / m 3 , much lower than the GB31574-2015 limit (0.5TEQng / m 3 ). Utilize SiO in solid waste 2 and Al 2 O 3 As the heavy metals in the network solidification, the leaching concentration of Cr is 0.20 mg / L, the leaching concentration of Pb is 0.15 mg / L, the leaching concentration of Cd is 0.15 mg / L, the leaching concentration of Ni is 0.22 mg / L, and the leaching concentration of Zn is 0.15 mg. / L, Cu leaching concentration is 0.25mg / L, the leaching rate of heavy metals ...

Embodiment 3

[0031] Mix the waste incineration fly ash, the waste incineration bottom ash and the quartz sand evenly. +MgO):(SiO 2 +Al 2 O 3) molar ratio of 1.1. The mixture was heated to 1400°C and melted to obtain a melt, which was cooled to obtain a glass body. Using high temperature pyrolysis to detoxify dioxin and alkali oxides (CaO+MgO) in the mixture to solidify chlorine element, the concentration of dioxin in the exhaust gas is 0.09TEQng / m 3 , much lower than the GB31574-2015 limit (0.5TEQng / m 3 ). Utilize SiO in solid waste 2 and Al 2 O 3 As the heavy metals in the network solidification, the leaching concentration of Cr is 0.06 mg / L, the leaching concentration of Pb is 0.24 mg / L, the leaching concentration of Cd is 0.21 mg / L, the leaching concentration of Ni is 0.12 mg / L, and the leaching concentration of Zn is 0.40 mg. / L, Cu leaching concentration is 0.20mg / L, the leaching rate of heavy metals is lower than the specified value of GB5085.3-2007.

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Abstract

The invention mainly belongs to the field of solid waste disposing and recycling and particularly relates to a detoxifying method of dioxin and heavy metal in waste incineration fly ash. According to the method, the waste incineration fly ash serves as a raw material, auxiliary materials containing alkaline oxides are added, and mixing materials are obtained after mixing. The mixing materials are fused, and a glass body is prepared and obtained. The added auxiliary materials containing the alkaline oxides can restrain secondary synthesis of the dioxin decomposed in the fusing process. Harmless disposal and value-increment of the waste incineration fly ash are achieved, and the detoxifying method of the dioxin and the heavy metal in the waste incineration fly ash has the advantages of wide in raw material source, short in process and low in production cost.

Description

technical field [0001] The invention mainly belongs to the field of solid waste disposal and resource utilization, and particularly relates to a method for detoxifying dioxins and heavy metals in waste incineration fly ash. Background technique [0002] In 2015, my country's domestic waste removal volume reached 192 million tons, of which 15-20% was incinerated. Waste incineration treatment has the ability to reduce volume, weight and harm quickly, and its fly ash production is 2-5%, because the waste incineration fly ash contains chromium, cadmium, mercury, lead, copper, nickel and other heavy metals and dioxins British and other organic substances belong to the HW18 category of hazardous solid waste. Waste incineration fly ash is generally disposed of by means of anti-seepage landfill, cement solidification, melting solidification, etc., and the risk of environmental pollution is high. [0003] Landfilling is still the most important disposal method for waste incineratio...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCB09B3/29B09B2101/30
Inventor 张深根范文迪刘波
Owner UNIV OF SCI & TECH BEIJING
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