Method for forming refuse-firing flyash

A waste incineration fly ash and molding method technology, which is applied to ceramic molding machines, sales of raw material supply devices, manufacturing tools, etc., can solve the problems of leaching toxic substances, complicated process, and expensive stabilizers, and achieve the reduction of leaching toxicity, physical Satisfied chemical properties, not easy to secondary pollution effect

Active Publication Date: 2011-08-31
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Garbage incineration will produce a large amount of fly ash, which contains a large amount of heavy metals. If it is not handled properly, it will leach toxic substances and cause secondary pollution.
In the prior art, the usual treatment methods for a large amount of fly ash produced in waste incineration are: 1) cement solidification. Although this technology has many advantages, the most critical problem is that due to the heavy metals in the final solidification body still exist, solidification The heavy metals in the body may still leach and re-enter the environment under different chemical conditions, causing unpredictable impact on the environment
2) The melting and solidification method is to directly heat the fly ash to a molten state to make it form a glass body to stabilize heavy metals. This method not only consumes a lot of energy, but also has high leaching toxicity, which is easy to carry out during transportation and smelting. produce secondary pollution
1. Stabilizers are expensive
2. High processing costs
3. The process is complex and immature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: The experimental material is No. 425 ordinary Portland cement; the incineration fly ash is taken from Chongqing Tongxing Waste Incineration Plant.

[0024] Add No. 425 ordinary Portland cement to the fly ash, the proportion is 2%, 5%, 8% or 10%; mix with 5% to 7% water evenly, use a disc pelletizer to make pellets, pellets Conservation and molding under natural conditions. After 2 to 10 days of curing in the curing room, the leaching toxicity test and strength test of the cement solidified body are carried out respectively.

[0025] After adding cement and mixed additives to solidify and form, the leaching toxicity of fly ash is greatly reduced, and the leaching concentrations of various heavy metals are lower than the identification standards for leaching toxicity of solid waste.

[0026] After testing, the compressive strength of the pellets is greater than 500N / ball, fully meeting the strength requirements for melting and separating heavy metals.

Embodiment 2

[0027] Example 2: The experimental materials are mixed additives: 3-10% slaked lime and 1-5% industrial syrup. The incineration fly ash is taken from Chongqing Tongxing Waste Incineration Plant.

[0028] Mix the mixed additives, fly ash and water according to the ratio of 2:93:5 or 5:90:5, respectively, and use a disc pelletizer to make pellets, and the pellets are cured and shaped under natural conditions. After 7-10 days of curing in the curing room, the leaching toxicity test and the strength test were carried out respectively.

[0029] The composition range and curing time of the mixed additive of the present invention are used for testing. After the mixed additive is mixed and molded, its leaching toxicity is greatly reduced compared with the original fly ash, and the leaching concentration of various heavy metals is lower than the solid waste leaching toxicity identification standard.

[0030] Fusion separation of fly ash can effectively separate heavy metals in fly ash....

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PUM

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Abstract

The invention is concerned with a molding method to fly ash of burning garbage. Add 2 to 15 percent of additive and mix with 5 to 7 percent of water, and make into ball with ball making machine and maintain the ball at nature condition. The formulation of additive is 2 to 10 percent of common portland cement with 425 size or 3 to 10 percent slaked lime and 1 to 5 percent industry syrup. The powder fly ash is disposed into ball by physics and chemistry denaturalization disposal to improve the metallurgy capability of stuff. The lixiviating toxicity of fly ash reduces greatly and the lixiviating concentration to all kind of heavy metal is lower than the standard without the second time of pollution. The anti-press intention of fly ash ball reaches the demand of transport and fusion to separate heavy metal.

Description

technical field [0001] The invention relates to a treatment method for waste incineration fly ash, in particular to a method for molding waste incineration fly ash so that no secondary pollution occurs during transportation and storage, and the compressive strength fully meets the requirements of transportation and melting separation. technical background [0002] Garbage incineration will produce a large amount of fly ash, which contains a large amount of heavy metals. If it is not handled properly, it will leach toxic substances and cause secondary pollution. In the prior art, the usual treatment methods for a large amount of fly ash produced in waste incineration are: 1) cement solidification. Although this technology has many advantages, the most critical problem is that due to the heavy metals in the final solidification body still exist, solidification The heavy metals in the body may still leach and re-enter the environment under different chemical conditions, causing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/02B28C7/06
Inventor 刘清才杜云贵董凌燕刘艺杨剑杨福云
Owner CHONGQING UNIV
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