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A method for making waterproof magnesium oxychloride refractory bricks by utilizing domestic waste incineration fly ash

A technology of domestic waste incineration and magnesium oxychloride bricks, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of loss of strength, poor water resistance, and limited use range, etc., to achieve water resistance, Simple equipment 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

But the shortcomings are also obvious. The water resistance of magnesium oxychloride cement is extremely poor, and its hardened body will gradually lose 60-80% of its strength in water, which limits its scope of use.

Method used

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  • A method for making waterproof magnesium oxychloride refractory bricks by utilizing domestic waste incineration fly ash
  • A method for making waterproof magnesium oxychloride refractory bricks by utilizing domestic waste incineration fly ash
  • A method for making waterproof magnesium oxychloride refractory bricks by utilizing domestic waste incineration fly ash

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Embodiment 1, utilizing domestic garbage to incinerate fly ash to make waterproof magnesium oxychloride refractory brick

[0061] 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.

[0062] Table 1 Content and leaching amount of heavy metals in fly ash of a waste incineration plant in Daxing, Beijing

[0063]

[0064] according to figure 1 The flow chart shown uses domestic waste incineration fly ash to make waterproof magnesium oxychloride refractory bricks. The specific steps are as follows:

[0...

Embodiment 2

[0080] Embodiment 2, utilizing domestic garbage to incinerate fly ash to make waterproof magnesium oxychloride refractory brick

[0081] The fly ash samples came from a waste incineration plant in Xingtai City, Hebei Province. 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.

[0082] Table 3 Heavy metal content and leaching amount in fly ash of a waste incineration plant in Xingtai, Hebei

[0083]

[0084] according to figure 1 The flow chart shown uses domestic waste incineration fly ash to make waterproof magnesium oxychloride refractory bricks. The specific steps are as follows: ...

Embodiment 3

[0100] Embodiment 3, making waterproof magnesium oxychloride refractory bricks by utilizing domestic waste incineration fly ash

[0101] 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.

[0102] Table 5 Heavy metal content and leaching amount in fly ash of a waste incineration plant in Linqu, Shandong

[0103]

[0104] according to figure 1 The flow chart shown uses domestic waste incineration fly ash to make waterproof magnesium oxychloride refractory bricks. The specific steps are as follows:

[0105] (1) Stabili...

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Abstract

The invention discloses a method for making waterproof magnesium oxychloride refractory bricks by using domestic garbage incineration fly ash. The method comprises the following steps: (1) adding sulfur-containing compounds and water into the fly ash, stirring and homogenizing for stabilization of heavy metals and slaking of CaO to obtain a stabilized slurry; (2) adding the stabilized slurry to the stabilized slurry Add MgO and MgCl 2 The aqueous solution is stirred homogeneously to obtain magnesium oxychloride slurry; (3) the magnesium oxychloride slurry is maintained to obtain magnesium oxychloride gel; (4) the magnesium oxychloride gel is broken to obtain Magnesium oxychloride aggregate; (5) Metastable materials, hydroxides of alkali metals, Na 2 SiO 3 1. Mix the magnesium oxychloride aggregate with water, stir and homogenize to obtain a mixed slurry; (6) maintain and shape the mixed slurry to obtain the magnesium oxychloride brick. The method of the invention uses soil polymer gel and magnesium oxychloride gel with differences in refractoriness and water resistance, realizes multi-stage solidification and stabilization of heavy metals, and improves the water resistance of magnesium oxychloride refractory bricks.

Description

technical field [0001] The invention relates to a method for making waterproof magnesium oxychloride refractory bricks by using domestic garbage 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 wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B18/02C04B18/10C04B111/28
CPCC04B18/021C04B28/006C04B2111/28C04B18/105C04B22/14C04B18/08C04B22/062C04B12/04C04B18/141Y02W30/91C04B28/32
Inventor 李金惠李扬谭全银
Owner TSINGHUA UNIV
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