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A kind of domestic waste incineration fly ash solidification processing method

A technology for domestic waste incineration and fly ash solidification, which is applied in the field of waste incineration and fly ash treatment, and can solve the problems of lack of application of control factors for heavy metal leaching from incineration fly ash, etc.

Active Publication Date: 2021-09-10
HANLANLVDIAN SOLID WASTE TREATMENT (FOSHAN) CO LTD 2ND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research content on the factors affecting the stabilization of waste incineration fly ash is mainly limited to the influence of liquid-solid ratio, pH value of leaching solution, and leaching time. Application Impact Study of Controlling Factors

Method used

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  • A kind of domestic waste incineration fly ash solidification processing method
  • A kind of domestic waste incineration fly ash solidification processing method
  • A kind of domestic waste incineration fly ash solidification processing method

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0043] The outlet temperature of the reaction tower in the domestic waste incineration fly ash solidification treatment method was set to 150°C, 155°C, 160°C, and 165°C respectively, and the influence of the reaction tower outlet temperature on the properties such as the index value of the bag fly ash was explored. The results are shown in Table 1 shown.

[0044] Table 1 Effect of reaction tower outlet temperature on properties of bagged fly ash

[0045]

[0046] From Table 1, it can be found that the outlet temperature of the reaction tower has a particularly obvious influence on the amount of lime. Within this temperature range, as the temperature rises, the index value of the fly ash rises. This is because at different temperatures, the lime slurry solution and the acidity The efficiency of the index reaction is not the same, so the dosage changes significantly. As the outlet temperature of the reaction tower rises, the amount of lime increases, resulting in more lime r...

experiment example 2

[0048] Using the solidification treatment method for domestic waste incineration fly ash of the present invention to treat three domestic waste incineration treatment lines, set the temperature of the reaction tower to 162°C, follow up and study the Index value of the bag fly ash of each reaction tower, and found that the semi-dry reaction tower The daily index fluctuations of fly ash range from 76 to 162, 64 to 184, and 96 to 184, respectively; the fluctuation trend of the index value of fly ash in reaction tower bags is basically the same, which may be mainly caused by the change of garbage composition and the degree of combustion fluctuations. In addition, the fluctuation trend of the index value of the bag ash of the three furnaces and the acidity index SO 2 , HCl showed a more obvious negative correlation, when the acid index is low, the Index value of the bag fly ash will increase significantly. From this experimental example, it can be concluded that the Index value of...

experiment example 3

[0050] The samples with the index value of the bagged fly ash in the range of 150-350 were selected to be mixed with the waste heat boiler fly ash respectively, and the effects of the index value and mixing ratio of the bagged fly ash on the properties of the mixed fly ash, the leaching toxicity of heavy metals and the difficulty of fly ash treatment were explored. , and the results are shown in Table 2.

[0051] Table 2 Effect of waste heat boiler fly ash and bag fly ash on fly ash properties

[0052]

[0053]

[0054] It can be seen from Table 2 that after the bag fly ash is mixed with the waste heat boiler fly ash, the alkalinity will decrease significantly, and the heavy metal leaching concentration of the mixed ash will change significantly; this is because the index value of the bag fly ash fluctuates, and generally deviates Alkaline, while the Index value of waste heat boiler fly ash is relatively stable and slightly acidic, so the Index value will change after mi...

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Abstract

The invention discloses a solidification treatment method for domestic waste incineration fly ash. The incineration flue gas is processed through a waste heat boiler and a reaction tower. Real-time mixing is carried out in the ash tank, and the fly ash in the bag filter connected behind the reaction tower is continuously transported to the bag fly ash tank for real-time mixing. Finally, the bag fly ash and waste heat boiler fly ash are mixed according to the weight ratio of 3:( 1‑2) Transport to the fly ash mixing tank for mixing and chelation treatment. The invention improves the waste incineration fly ash treatment process, controls the index value of the fly ash by controlling the outlet temperature of the reaction tower, combined with the novel fly ash mixing process, can control the index value of the fly ash within the optimal range, and the fluctuation range is small, It minimizes the processing difficulty of fly ash, and ensures that the leaching toxicity of heavy metals after fly ash solidifies meets the requirements of environmental protection standards.

Description

technical field [0001] The invention relates to the technical field of waste incineration fly ash treatment, in particular to a method for solidifying domestic waste incineration fly ash. Background technique [0002] With the rapid development of the economy, the rapid improvement of people's living standards and the continuous expansion of cities, my country's urban domestic waste is increasing at a rate of 8%-10% per year, seriously affecting the human living environment and sustainable urban development. Incineration fly ash is a secondary pollutant produced in the process of waste incineration, and its output is about 3%-5% of the amount of waste incineration. Since incineration fly ash is enriched with a large amount of harmful substances, it is managed as hazardous waste. The main treatment and disposal method of waste incineration fly ash is to go through solidification / stabilization and meet the conditions stipulated in GB16889-2008 "Standards for Pollution Control...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
CPCB09B3/00B09B3/21B09B2101/30
Inventor 龚丽芳陈银娣曾晓东郭光召张文杰罗国衡
Owner HANLANLVDIAN SOLID WASTE TREATMENT (FOSHAN) CO LTD 2ND
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