Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing light aggregate through burning fly ash by using garbage

A waste incineration fly ash and lightweight aggregate technology, applied in the direction of solid waste removal, sustainable waste treatment, solid waste management, etc., can solve the problem of quality decline of sintered products, affecting the effect of secondary pollution control, and dioxin control Difficulties and other problems, to achieve the effect of low processing cost

Inactive Publication Date: 2005-08-17
TSINGHUA UNIV
View PDF0 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Due to the characteristics of living standards and eating habits, the alkali metal chloride content of waste incineration fly ash in my country is very high, which is not conducive to high-temperature treatment methods such as sintering
On the one hand, high chloride content will promote the resynthesis of dioxins in the exhaust gas, making it difficult to control dioxins; at the same time, chlorides also promote the high-temperature volatilization of heavy metals, which also affects the effect of secondary pollution control
In addition, the sintering process is easy to degrade the quality of sintered products due to water analysis, which cannot realize resource utilization

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing light aggregate through burning fly ash by using garbage

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] Fly ash collected by a grate-type garbage incinerator bag filter in Shanghai was extracted with 15 times of water for 60 minutes. The kneading molding equipment produces cylindrical particles with a diameter of 20mm and a length of about 20mm, and enters the integrated electric heating sintering furnace for curing and sintering for about 8 hours. The temperature in the sintering zone is 1100°C. The material coming out of the sintering furnace is light aggregate with a density of 880kg. / m3, the compressive strength is 15.5Mpa, and the mechanical strength and pollutant indicators such as heavy metals all meet the requirements of building lightweight aggregate. The decomposition rate of dioxin in the fly ash reaches 98%. The leaching test of the product shows that the heavy metal meets the relevant standards, and the wastewater and waste gas discharged during the whole process meet the requirements of relevant regulations.

example 2

[0032] The fly ash collected by a grate-type garbage incinerator bag filter in Shanghai was extracted with 25 times of water for 45 minutes. The kneading molding equipment produces cylindrical particles with a diameter of 10mm and a length of about 10mm, and enters the integrated electric heating sintering furnace for curing and sintering for about 7 hours. The temperature in the sintering zone is 1080°C. The material coming out of the sintering furnace is light aggregate with a density of 900kg. / m3, compressive strength 14.6Mpa, mechanical strength and pollutant indicators such as heavy metals all meet the requirements of building lightweight aggregate. The decomposition rate of dioxin in the fly ash reaches 98%. The leaching test of the product shows that the heavy metal meets the relevant standards, and the wastewater and waste gas discharged during the whole process meet the requirements of relevant regulations.

example 3

[0034] The fly ash collected by a grate-type garbage incinerator bag filter in Shanghai was extracted with 25 times of water for 45 minutes. The kneading molding equipment produces cylindrical particles with a diameter of 10mm and a length of about 10mm, and enters the integrated electric heating sintering furnace for curing and sintering for about 9 hours. The temperature in the sintering zone is 1000°C. The material coming out of the sintering furnace is light aggregate with a density of 880kg. / m3, the compressive strength is 14.0Mpa, and the mechanical strength and pollutant indicators such as heavy metals all meet the requirements of building lightweight aggregate. The decomposition rate of dioxin in the fly ash reaches 98%. The leaching test of the product shows that the heavy metal meets the relevant standards, and the wastewater and waste gas discharged during the whole process meet the requirements of relevant regulations.

[0035] Compared with the existing waste inc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

The present invention is method of utilizing garbage incinerating flyash in producing light aggregate, and belongs to the technology of treating and utilizing harmful heavy metal waste. The method includes extraction and separation to eliminate great amount of soluble chlorates; controlling the extractant amount and extracting liquid pH value to reduce the migration of heavy metal matter to extracted liquid phase; and obtaining light aggregate through adding adhesive, pelletizing and sintering. The present invention provides one extracting desalting combined sintering process to ensure the strength of sintered matter. In addition, the present invention can decompose dioxin and similar pollutant in the material and cure heavy metal in the sintered product.

Description

technical field [0001] The invention relates to a technology capable of harmlessly treating waste incineration fly ash containing heavy metals and dioxins and realizing resource utilization, in particular to a method for burning lightweight aggregate by using waste incineration fly ash. The invention belongs to the technical field of hazardous waste treatment and disposal. Background technique [0002] With the popularization and application of incineration treatment in the field of municipal waste, medical waste, hazardous waste and other solid waste treatment, the amount of fly ash produced by waste incineration is increasing day by day. Practice has proved that in the process of waste incineration, volatile heavy metals (including Hg, Cd, Pb, etc.) Heavy metals and dioxin-like pollutants with relatively high toxic equivalents, among which dioxins in fly ash account for more than 60% of the total dioxins produced by incinerators, usually incineration fly ash is regarded a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C04B18/10
CPCY02W30/91
Inventor 聂永丰李润东刘锋
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products