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Method for comprehensive and safe utilization of domestic garbage incineration fly ash

A technology of domestic waste incineration and fly ash, applied in the field of environmental protection technology and solid waste resource utilization, to achieve the effect of improving effect and efficiency, reducing volatile matter, and realizing comprehensive resource utilization

Active Publication Date: 2019-09-20
深圳市航天新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resource utilization of fly ash is only possible if the excessively high content of inorganic salts in fly ash is removed, heavy metals must be permanently and safely solidified, and dioxins must be completely removed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Using potassium hydroxide, sodium hydroxide, calcined kaolin and silica fume as raw materials, prepare 1.1K 2 O 2.8Na 2 O·3.8Al 2 o 3 8.0 SiO2 2 The monovalent alkali metal aluminosilicate is mixed uniformly to prepare an inorganic curing agent. The domestic waste incineration fly ash is mixed with the inorganic curing agent and water in a weight ratio of 1:1:1 to form a mixture. The cured body is formed by machine pressing; the formed product is cured at 20°C for 3 days; the cured product is soaked in water at 25°C, the water weight is twice that of the cured product, and the soaking time is 7 days; the soaking liquid is collected for separation and purification ; The solidified block after soaking is placed in a heat treatment furnace and sintered at a high temperature of 1200°C to form a sintered body. The sintered body meets the national Class I general industrial solid waste standard and can be used safely as a building material.

Embodiment 2

[0041] Using potassium hydroxide, sodium hydroxide, calcined kaolin and silica fume as raw materials, prepare K 2 O·3Na 2 O·4Al 2 o 3 ·8SiO2 2 The monovalent alkali metal aluminosilicate is mixed uniformly to prepare an inorganic curing agent. The domestic waste incineration fly ash is mixed with the inorganic curing agent and water in a weight ratio of 2:1:1 to form a mixture. The cured body is formed by machine pressing; the formed product is cured at 50°C for 1 day; the cured product is soaked in 25°C water, the water weight is 5 times that of the cured product, and the soaking time is 7 days; the soaking liquid is collected for separation and purification; After soaking, the solidified block is placed in the plasma treatment equipment and melted at a high temperature of 1400°C to form a molten body. The molten body meets the national Class I general industrial solid waste standard and can be used safely as a building material.

Embodiment 3

[0043] Using potassium hydroxide, sodium hydroxide, calcined kaolin and silica fume as raw materials, prepare K 2 O·3Na 2 O·4Al 2 o 3 ·8SiO2 2 The monovalent alkali metal aluminosilicate is mixed uniformly to prepare an inorganic curing agent. The domestic waste incineration fly ash is mixed with the inorganic curing agent and water in a weight ratio of 3:1:1 to form a mixture. The solidified body is extruded by a machine; the molded product is cured at 80°C for 8 hours; the cured product is soaked in 60°C water, the water weight is 5 times that of the cured product, and the soaking time is 1 day; the soaking liquid is collected for separation, Purification: put the soaked and solidified block in a hot plasma device, and melt it at a high temperature of 1300 ° C to form a molten body. The melt reaches the national Class I general industrial solid waste standard and can be safely used as building materials.

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Abstract

The invention relates to a method for comprehensive and safe utilization of domestic garbage incineration fly ash. The method has the characteristic of comprising the steps: mixing the domestic garbage incineration fly ash with a specific inorganic curing agent and water at a weight ratio of (1-10):1:1 so as to form a mixture, molding the mixture, curing the molded product at a certain temperature for a period of time, immersing the cured product in water at 5-100 DEG C for a certain period of time, putting the solid phase product in a plasma processing device after soaking, and performing melting or sintering at a high temperature of 1200-1500 DEG C so as to form a vitreous body or ceramsite. Through the method, the technical problem of difficult separation of a large amount of inorganic salts in the domestic garbage incineration fly ash is solved effectively, a feasible technical method is provided for resource utilization of the high value-added inorganic salts in the domestic garbage incineration fly ash, and a large amount of the inorganic salts in the domestic garbage incineration fly ash is removed, so that the effect and efficiency of fly ash treatment through plasma hot melt are improved significantly, and safe and reliable building materials obtained through resource utilization of the fly ash are obtained.

Description

technical field [0001] The invention belongs to the fields of environmental protection technology and solid waste resource utilization, and more specifically relates to a method for comprehensively and safely utilizing domestic waste incineration fly ash. Background technique [0002] The current treatment method for municipal solid waste is mainly incineration to generate electricity. The solid waste generated during the waste incineration process is mainly collected by the dust collector of the flue gas treatment system of the incinerator in the form of fly ash. Studies have shown that domestic waste incineration fly ash contains a large amount of inorganic salts, and contains heavy metals such as Hg, Pb, Cd, Cu, Cr, Zn, Ni, etc. and harmful substances such as dioxins. Once these harmful substances enter the human body, it will be difficult to excrete them, and may directly damage the nervous system, digestive system, reproductive system, immune system and bones of the hu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C6/04C04B33/132C04B33/135C04B33/13B28B11/24B28B11/00
CPCB28B11/00B28B11/24C03C1/002C04B33/131C04B33/1315C04B33/132C04B33/1355C04B2235/656Y02P40/60
Inventor 曹海琳李绍彬高平翁履谦郭悦陈宇丁文桓
Owner 深圳市航天新材科技有限公司
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