Method for low-temperature sintering of porous ceramic by using waste incineration fly ash

A technology for waste incineration fly ash and porous ceramics, which is applied in the production and application of ceramic products and ceramic materials, can solve the problems of poor long-term stability, high processing cost, high energy consumption, etc., achieves increased compressive strength, avoids secondary Pollution, the effect of meeting technical needs

Inactive Publication Date: 2018-08-21
FUZHOU UNIV +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In the process of waste incineration fly ash treatment, harmless methods such as cement solidification, chemical agent solidification, and hydrothermal solidification generally have poor long-term stability, waste water generated during the process, increased treatment costs, and heavy metal leaching is easy to exceed the standard, while sintering and Glass melting and solidification also has high energy consumption, secondary pollution, and high processing costs. Therefore, it is necessary to explore a new method that can not only make waste incineration fly ash harmless, but also realize waste incineration fly ash as a resource.

Method used

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  • Method for low-temperature sintering of porous ceramic by using waste incineration fly ash

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Embodiment 1

[0026] A method for low-temperature sintering of porous ceramics utilizing waste incineration fly ash, comprising the following specific steps:

[0027] (1) Weighing and pretreatment of raw materials: Weigh waste incineration fly ash, cement, ceramic waste, sodium tetraborate and glass fiber reinforced plastic waste, and grind ceramic waste and glass fiber reinforced plastic waste into powder respectively. Among them, waste incineration fly ash is mainly The composition is SiO 2 , CaO, Fe 2 o 3 and Al 2 o 3 , the content of typical heavy metals Zn, Cu, Cr and Pb in the waste incineration fly ash, represented by ZnO, CuO, Cr 2 o 3 The ranges of PbO and PbO are 7.25%, 5.50%, 1.88%, and 0.22%, respectively, and the cement is Portland cement PC3.25;

[0028] (2) Foaming: add the foaming agent into the water according to the dosage of 0.1% to 0.9%, stir evenly, pour it into the foaming machine for foaming treatment, and collect the foam after the foam is uniform and stable; ...

Embodiment 2

[0034] A method for low-temperature sintering of porous ceramics utilizing waste incineration fly ash, comprising the following specific steps:

[0035] (1) Weighing and pretreatment of raw materials: Weigh waste incineration fly ash, cement, ceramic waste, sodium tetraborate and glass fiber reinforced plastic waste, and grind ceramic waste and glass fiber reinforced plastic waste into powder respectively. Among them, waste incineration fly ash is mainly The composition is SiO 2 , CaO, Fe 2 o 3 and Al 2 o 3 , the content of typical heavy metals Zn, Cu, Cr and Pb in the waste incineration fly ash, represented by ZnO, CuO, Cr 2 o 3 The ranges of PbO and PbO are 7.06%, 4.95%, 2.00%, and 0.15%, respectively, and the cement is Portland cement PC3.25;

[0036] (2) Foaming: add the foaming agent into the water according to the dosage of 0.1% to 0.9%, stir evenly, pour it into the foaming machine for foaming treatment, and collect the foam after the foam is uniform and stable; ...

Embodiment 3

[0042] A method for low-temperature sintering of porous ceramics utilizing waste incineration fly ash, comprising the following specific steps:

[0043] (1) Weighing and pretreatment of raw materials: Weigh waste incineration fly ash, cement, ceramic waste, sodium tetraborate and glass fiber reinforced plastic waste, and grind ceramic waste and glass fiber reinforced plastic waste into powder respectively. Among them, waste incineration fly ash is mainly The composition is SiO 2 , CaO, Fe 2 o 3 and Al 2 o 3 , the content of typical heavy metals Zn, Cu, Cr and Pb in the waste incineration fly ash, represented by ZnO, CuO, Cr 2 o 3 The ranges of PbO and PbO are 6.95%, 5.50%, 1.71%, and 0.24%, respectively, and the cement is Portland cement PC3.25;

[0044] (2) Foaming: add the foaming agent into the water according to the dosage of 0.1% to 0.9%, stir evenly, pour it into the foaming machine for foaming treatment, and collect the foam after the foam is uniform and stable; ...

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Abstract

The invention discloses a method for low-temperature sintering of porous ceramic by using waste incineration fly ash. The method comprises the following steps: with cement and the waste incineration fly ash as raw materials, adding ceramic wastes, sodium tetraborate and a glass reinforced plastic waste material for curing; and then preparing a porous ceramic material by using a low-temperature sintering method, wherein the prepared porous ceramic has the characteristics that the porosity is as high as 80 percent, apparent density is only 0.736 g / cm<-3> and compressive strength can reach 11.9 MPa. The method disclosed by the invention has the characteristics that the problem of environmental pollution caused by the waste incineration fly ash is solved; besides, the waste incineration fly ash is effectively utilized to obtain a porous ceramic body which has the characteristic of low leaching toxicity; and economic value is created while heavy metal is cured.

Description

technical field [0001] The invention relates to the technical fields of harmless treatment technology of garbage incineration fly ash and solidification treatment technology of garbage, in particular a method for low-temperature sintering of porous ceramics by using garbage incineration fly ash. Background technique [0002] In 2015, the annual production of domestic waste in 246 large and medium-sized cities in my country reached 185 million tons, and it continues to increase at a rate of about 8% every year. Waste disposal is already a very difficult task. Domestic waste incineration technology has been widely used in the world because of its fast processing speed, obvious volume and weight reduction, and heat energy utilization. However, after the garbage is incinerated, the fly ash collected in the flue gas purification device contains a large amount of toxic heavy metals (such as: Hg, Pb, Cd, Cr, Cu, Zn, etc.) Included in the Hazardous Waste List (HW18), in order to av...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B33/135C04B33/132C04B33/13
CPCC04B33/13C04B33/1324C04B33/1355C04B38/0665C04B2235/3409C04B2235/3427C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607C04B38/0074C04B38/0067Y02P40/60
Inventor 刘明华张熔烁吕源财林春香刘以凡李晓泉
Owner FUZHOU UNIV
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