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A method for making bricks by using domestic waste to incinerate fly ash and slag

A technology of domestic waste incineration and fly ash, which is applied in the direction of cement production, etc., can solve the problems of restricting the market and development of fly ash resource-based bricks, restricting the use range of fly ash resource-based bricks, poor mechanical properties and environmental friendliness, etc. Thermal and mechanical properties, good effects, good social and economic benefits

Active Publication Date: 2019-09-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the ways of resource utilization of fly ash through building materials mainly include producing cement, making concrete, making bricks, laying roadbeds, building dams, etc. Although there are many ways, most of the building materials produced by using fly ash are Silicate building materials, especially when used for brick making and recycling, are mostly building material brick products mainly composed of calcium silicate crystals, with poor mechanical properties and environmental friendliness, especially the stabilization and curing effect of heavy metals needs to be improved , which limits the scope of use of fly ash resource bricks, and also limits the market and development of fly ash resource bricks

Method used

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  • A method for making bricks by using domestic waste to incinerate fly ash and slag
  • A method for making bricks by using domestic waste to incinerate fly ash and slag
  • A method for making bricks by using domestic waste to incinerate fly ash and slag

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Effect test

Embodiment 1

[0061] Embodiment 1, utilize domestic waste to incinerate fly ash and slag to make brick

[0062] The fly ash samples and slag samples came from a waste incineration plant in Daxing District, Beijing. The content and leaching amount of heavy metals in the fly ash samples are shown in Table 1. For the leaching method, refer to the Horizontal Oscillation Method for Toxic Leaching of Solid Wastes (HJ557-2010), and for the limit standard, refer to the standard for Class V water bodies in the Environmental Quality Standards for Surface Water (GB3838-2002). It can be seen from Table 1 that the leaching amount of Pb seriously exceeds the standard.

[0063] Table 1 Content and leaching amount of heavy metals in fly ash of a waste incineration plant in Daxing, Beijing

[0064]

[0065] according to figure 1 The flow chart shown uses domestic waste incineration fly ash and slag to make bricks, and the specific steps are as follows:

[0066] (1) Fly ash aging:

[0067] The fly ash...

Embodiment 2

[0088] Embodiment 2, utilize domestic waste to incinerate fly ash and slag to make brick

[0089] The fly ash samples and slag samples came from a waste incineration plant in Xingtai, Hebei. The content and leaching amount of heavy metals in the fly ash samples are shown in Table 3. For the leaching method, refer to the Horizontal Oscillation Method for Toxic Leaching of Solid Wastes (HJ557-2010), and for the limit standard, refer to the standard for Class V water bodies in the Environmental Quality Standards for Surface Water (GB3838-2002). It can be seen from Table 3 that the leached amounts of Pb and Zn seriously exceed the standard.

[0090] Table 3 Heavy metal content and leaching amount in fly ash of a waste incineration plant in Xingtai, Hebei

[0091]

[0092]

[0093] according to figure 1 The flow chart shown uses domestic waste incineration fly ash and slag to make bricks, and the specific steps are as follows:

[0094] (1) Fly ash aging:

[0095] The fly ...

Embodiment 3

[0116] Embodiment 3, utilize domestic refuse to incinerate fly ash and slag to make brick

[0117] The fly ash samples and slag samples came from a waste incineration plant in Linqu, Shandong. The content and leaching amount of heavy metals in the fly ash samples are shown in Table 5. For the leaching method, refer to the Horizontal Oscillation Method for Toxic Leaching of Solid Wastes (HJ557-2010), and for the limit standard, refer to the standard for Class V water bodies in the Environmental Quality Standards for Surface Water (GB3838-2002). It can be seen from Table 5 that the leaching amount of Pb and Cr exceeds the standard.

[0118] Table 5 Heavy metal content and leaching amount in fly ash of a waste incineration plant in Linqu, Shandong

[0119]

[0120] according to figure 1 The flow chart shown uses domestic waste incineration fly ash and slag to make bricks, and the specific steps are as follows:

[0121] (1) Fly ash aging:

[0122] The fly ash is mixed with ...

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Abstract

The invention discloses a method used for making bricks from domestic waste incineration fly ash and furnace slag. The method comprises following steps: 1, CaO in domestic waste incineration fly ash is subjected to slaking; 2, a sulfur containing compound and cement are added into a material obtained via slaking, and an obtained mixture is subjected to stirring homogenizing and heavy metal stabilization; 3, a product obtained via heavy metal stabilization is subjected to curing so as to obtain a fly ash heavy metal solidified body; 4, the fly ash heavy metal solidified body is subjected to crushing so as to obtain a fly ash powder material; 5, CaO in furnace slag is subjected to slaking; 6, a product material obtained via slaking of CaO in furnace slag is subjected to drying so as to obtain furnace clinker; 7, the furnace clinker is subjected to crushing so as to obtain furnace slag powder; 8, the fly ash powder material, the furnace slag powder, fly ash, NaOH, and water are mixed so as to obtain a mortar; and 9, the mortar is subjected to curing and moulding so as to obtain bricks. According to the method, geopolymeric gel and tobermorite are adopted to prepare building materials,resource utilization on fly ash and furnace slag is realized, brick mechanical properties are improved, and multistage solidification stabilization of heavy metal in fly ash is realized.

Description

technical field [0001] The invention relates to a method for making bricks by using domestic waste incineration fly ash and slag, and belongs to the technical field of resource utilization of hazardous waste and general industrial waste building materials. Background technique [0002] Domestic waste incineration fly ash (hereinafter referred to as fly ash) refers to the residues collected in flue gas purification systems and heat recovery systems (such as economizers, waste heat boilers, etc.). [0003] Due to the volatilization and migration of heavy metals during incineration, a large amount of heavy metals, such as Hg, Pb, Cd, Cu, Cr, Zn, Ni, etc., are enriched in fly ash. According to existing literature reports, in fly ash in my country, Zn can reach up to 17000mg / kg, Cu can reach up to 12000mg / kg, Pb can reach up to 30000mg / kg, Cd can reach up to 5000mg / kg, and Cr can reach up to 3500mg / kg. kg, Ni up to 1500mg / kg. Once heavy metals enter the human body, it will be di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00
CPCC04B28/006C04B2201/50C04B18/021C04B18/088C04B18/142C04B18/08C04B22/062Y02P40/10
Inventor 李金惠李扬谭全银
Owner TSINGHUA UNIV
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