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A method for making bricks by using domestic waste incineration fly ash

A domestic waste incineration and fly ash technology, which is applied to the pavement paved with prefabricated blocks, cement production, roads, etc., can solve the restrictions on the market and development of fly ash resource bricks, unstable mechanical properties and environmental friendliness, and limitations Issues such as the scope of use of fly ash resource bricks, to achieve optimal curing and stabilization effects, stable thermal and mechanical properties, and 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 unstable mechanical properties and environmental friendliness, especially for the stabilization and curing of heavy metals. increase, 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 incineration fly ash
  • A method for making bricks by using domestic waste incineration fly ash
  • A method for making bricks by using domestic waste incineration fly ash

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Effect test

Embodiment 1

[0050] Embodiment 1, utilize domestic garbage to incinerate fly ash to make brick

[0051] The fly ash samples came from a waste incineration plant in Daxing District, Beijing. The content and leaching amount of heavy metals in the 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.

[0052] Table 1 Content and leaching amount of heavy metals in fly ash of a waste incineration plant in Daxing, Beijing

[0053]

[0054] according to figure 1 The flow chart shown uses domestic waste incineration fly ash to make bricks, and the specific steps are as follows:

[0055] (1) Material mixing:

[0056] The fly ash, MgO and cement were mixed homogeneous...

Embodiment 2

[0070] Embodiment 2, utilize domestic garbage to incinerate fly ash to make bricks

[0071] The fly ash samples came from a waste incineration plant in Xingtai, Hebei. The content and leaching amount of heavy metals in the 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.

[0072] Table 3 Heavy metal content and leaching amount in fly ash of a waste incineration plant in Xingtai, Hebei

[0073]

[0074] according to figure 1 The flow chart shown uses domestic waste incineration fly ash to make bricks, and the specific steps are as follows:

[0075] (1) Material mixing:

[0076] The fly ash, MgO and cement were mixed homogeneously in so...

Embodiment 3

[0090] Embodiment 3, utilize domestic garbage to incinerate fly ash to make bricks

[0091] The fly ash samples came from a waste incineration plant in Linqu, Shandong. The content and leaching amount of heavy metals in the 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.

[0092] Table 5 Heavy metal content and leaching amount in fly ash of a waste incineration plant in Linqu, Shandong

[0093]

[0094] according to figure 1 The flow chart shown uses domestic waste incineration fly ash to make bricks, and the specific steps are as follows:

[0095] (1) Material mixing:

[0096] The fly ash, MgO and cement were mixed homogeneously in solid pha...

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Abstract

The invention discloses a method for making a brick by household garbage incineration fly ash. The method includes the steps: (1) curing slurry prepared from the fly ash, MgO, cement and water to obtain a solidified body; (2) crushing the solidified body in the step (1) to obtain fly ash aggregate; (3) homogeneously mixing coal ash, NaOH, the water and the fly ash aggregate in the step (2); (4) curing and forming mortar in the step (3) to obtain the brick serving as a building material. Two gels including hydrated calcium silicate and geopolymers with different crystalline natures are matchedto manufacture the building material, multistage solidification and stabilization of heavy metals in the fly ash and building material recycling of the fly ash are realized, the mechanical performanceof the recycled building material is improved, the process is reliable, equipment and principles are simple, and the household garbage incineration fly ash in different regions and different furnaceprofiles can be safely and efficiently used.

Description

technical field [0001] The invention relates to a method for making bricks by utilizing domestic waste incineration fly ash, and belongs to the technical field of resource utilization of hazardous 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 difficult to excrete them from the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B18/02E01C5/04E01C11/22C04B18/10
CPCC04B18/021C04B28/006C04B2201/50E01C5/04E01C11/221C04B22/062C04B18/106C04B14/304Y02P40/10Y02W30/91
Inventor 李金惠李扬谭全银
Owner TSINGHUA UNIV
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