Method for stabilization of refuse incineration fly ash

A technology for waste incineration fly ash and stabilization treatment, applied in the field of waste incineration, can solve problems such as inability to large-scale application, unstable effect, complicated process, etc., and achieve the effects of low cost, large processing capacity and simple process flow

Inactive Publication Date: 2013-08-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has obvious disadvantages, such as: secondary pollution, complex process, unstable effect, etc. It is currently in the stage of laboratory research
Other resource processing methods cannot be applied on a large scale due to economic and technical reasons
At present, the waste incineration fly ash in Shanghai is mixed with cement and chelating agent for stabilization treatment, and then it is landfilled as hazardous waste. According to the survey, the landfill cost is as high as 2,400 yuan / ton

Method used

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  • Method for stabilization of refuse incineration fly ash
  • Method for stabilization of refuse incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The fly ash collected by a grate-type domestic waste incinerator bag filter in the south has a moisture content of 3%. The main components of the fly ash and its ingredient metakaolin are shown in Table 1. The fly ash samples were tested according to "Leach Toxic Leaching Method of Solid Waste Horizontal Oscillating Method" (GB5086.2-1997), "Toxic Leaching Method of Solid Waste Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), "Toxic Leaching Method of Solid Waste Acetic Acid Buffer Solution Method" (HJ / T300-2007) was used for leaching toxicity test, and flame atomic absorption method was used to measure the concentration of heavy metals in the leaching solution. The analysis results are shown in Table 2.

[0025] Table 1 Main components of fly ash and metakaolin, %

[0026] material

SiO 2

Fe 2 o 3

al 2 o 3

CaO

MgO

Metakaolin

44.23

1.04

35.872

8.094

0.566

fly ash

18.625

2.309 ...

Embodiment 2

[0033] Weigh 850g of domestic waste incineration fly ash and 150g of metakaolin, place them in a cement mortar mixer, stir evenly, add 270ml of aqueous solution containing 30g of NaOH, continue stirring for 25 minutes, inject into the model and vibrate, and let it stand in the air for 24 hours before demoulding Microwave irradiation for 3 minutes, natural curing in the air for 3 days, watering for 3 days (watering once every 7 hours), and then natural curing to the finished product. The strength and leaching test results are shown in Table 3.

Embodiment 3

[0035]Weigh 900g of domestic waste incineration fly ash and 100g of metakaolin, place them in a cement mortar mixer, stir evenly, add 285ml of aqueous solution containing 90g of NaOH, continue stirring for 40min, inject into the mold and vibrate, and let it stand in the air for 24h before demoulding Microwave irradiation for 5 minutes, natural curing in the air for 2 days, watering for 4 days (sprinkling water once every 6 hours), and then natural curing to the finished product. The strength and leaching test results are shown in Table 3.

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Abstract

The invention relates to method for stabilization of refuse incineration fly ash, which includes the following steps: 85 to 98 percent by weight of refuse incineration fly ash and 2 to 15 percent by weight of metakaolin are uniformly mixed, added with alkaline solution, in which the amount of added solid accounts for 1 to 10 percent of the total weight and the water-ash ratio is 0.2 to 0.45, constantly agitated, shaped, irradiated by microwaves for 1 to 5 minutes, naturally cured for 2 to 3 days and then watered to be naturally cured for 3 to 5 days, and thereby a finished product is obtained. The process flow is simple, the cost is low, the fly ash treatment capability is high, the operability is high, and a shaped brick can meet the requirement for MU10 standard strength, size and durability in GB / T5101-1998 and come up to the extraction toxicity standard, and can be used as a novel building material.

Description

technical field [0001] The invention belongs to the field of garbage incineration, in particular to a method for stabilizing treatment of garbage incineration fly ash. Background technique [0002] With the acceleration of urbanization and the improvement of people's material life, the amount of urban domestic waste in my country is increasing by 8%-10% every year. According to statistics, the emission in 2011 has exceeded 290 million tons, and the volume of cleaning and transportation is about 200 million. Ton. Garbage incineration has the advantages of small footprint, significant reduction effect (95% reduction in volume, 75% reduction in weight), complete harmlessness, resource utilization of waste (recovery of electric energy and heat energy), etc. The main method of domestic waste. In recent years, the proportion of domestic waste incineration in my country has increased year by year. By 2011, there were more than 100 waste incineration plants under construction and c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00
Inventor 陈泉源袁正璞余阳李新颖谢学报
Owner DONGHUA UNIV
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