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Pretreatment method for waste incineration fly ash

A technology for waste incineration fly ash and pretreatment, which is applied in chemical instruments and methods, solid waste removal, cement production, etc., to achieve the effects of resource saving, short process and easy industrial application

Pending Publication Date: 2021-06-11
湖南青涟环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the difficulty of dehydration is a key factor restricting the industrial application of these patented technologies

Method used

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  • Pretreatment method for waste incineration fly ash

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Experimental program
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Embodiment 1

[0056] Embodiment 1. In this embodiment, fly ash from a waste incineration power generation enterprise in Hunan is used as a sample. The main components of the samples are listed in Table 1.

[0057] Table 1 Composition (%) of domestic waste incineration fly ash

[0058] Element Al 2 o 3

SiO 2

Fe 2 o 3

CaO K 2 o

Na 2 o

SO 3

Cl C content 9.0 20.3 5.0 26.6 4.2 5.8 6.5 12.5 9.1

[0059] Such as figure 1 Shown, the pretreatment method of waste incineration fly ash of the present invention comprises the steps:

[0060] 1. After mixing fly ash and river sand powder, add it to lye and stir evenly to obtain a slurry; the mass ratio of each component in the slurry is fly ash: river sand powder: sodium hydroxide: water = 100:35: 35:1000; Among them: the silica content of river sand powder is 88.1%, the particle size is -0.075mm, 86.5%.

[0061] 2. Put the slurry into the reaction kettle, start the mixer, set th...

Embodiment 2

[0064] Embodiment 2, the fly ash sample of this embodiment is the same as that of Embodiment 1.

[0065] As a method for pretreatment of waste incineration fly ash according to an embodiment of the present invention, the method comprises the following steps:

[0066] 1. After the fly ash and quartz powder are combined, add to the lye and stir evenly to obtain a slurry; the mass ratio of each component in the slurry is fly ash:quartz powder:sodium hydroxide:water=100:30:35: 1000; Among them: the silica content of quartz powder is 90.6%, the particle size is -0.075mm, 85.2%.

[0067] 2. Put the slurry into the reaction kettle, start the mixer, set the speed at 100 rpm, heat the slurry to 95°C-100°C with an electric heater, keep it warm and continue stirring for 120 minutes.

[0068] 3. Vacuum suction filtration of the reacted slurry to obtain a primary filter cake and leachate.

[0069] 4. Wash the water and the primary filter cake with water for 1 pass according to the liquid...

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Abstract

The invention discloses a pretreatment method for waste incineration fly ash. The pretreatment method comprises the following steps of: 1, mixing: mixing the waste incineration fly ash with quartz powder and an alkali liquor into slurry; 2, heating and stirring: carrying out catalytic circular reaction under heating and stirring conditions; 3, solid-liquid separation: carrying out solid-liquid separation on the reacted slurry to obtain a leaching solution and leaching residues, and returning the leaching solution to the alkali liquor for recycling; and 4, post-treatment: carrying out cleaning, drying, ball milling, forming and the like on the leaching residues to obtain dechlorinated residues. The method has the advantages of simple raw materials, short process, easiness in industrial application and significance of resource saving and environment friendliness.

Description

technical field [0001] The invention specifically relates to a pretreatment method for waste incineration fly ash. Background technique [0002] As the economy develops and consumption increases, municipal solid waste also increases accordingly. Faced with the increasingly serious problem of domestic waste disposal, the traditional landfill disposal method can no longer meet the requirements of the public and regulations for environmental protection due to its persistent negative effects. Incineration power generation is an effective way to realize the reduction and recycling of domestic waste. But the fly ash produced by domestic waste incineration is hazardous waste. [0003] Studies have shown that the output of fly ash is 3% to 5% of the incinerated domestic waste. Chlorides, heavy metals and dioxins in fly ash are harmful components. cause havoc. [0004] In order to effectively control waste incineration fly ash, domestic and foreign scientific and technological wo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00C04B7/28C04B7/42
CPCB09B5/00C04B7/28C04B7/424B09B3/40Y02P40/10
Inventor 罗明亮
Owner 湖南青涟环保科技有限公司
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