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Resource utilization method of waste incineration fly ash

A technology for recycling and recycling waste incineration fly ash, which is applied in the field of recycling and utilization of waste incineration fly ash, and can solve problems such as non-recycling and utilization.

Pending Publication Date: 2022-05-10
陈彤 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method separates and recovers the soluble salt and heavy metal components in the fly ash, but the most important component in the fly ash-calcium compound is not recycled (the calcium content in the fly ash can reach 15-40%)

Method used

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  • Resource utilization method of waste incineration fly ash
  • Resource utilization method of waste incineration fly ash
  • Resource utilization method of waste incineration fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0095] In this embodiment, 100 kg of waste incineration fly ash from a waste incineration plant in a northern city is used. The main elements and heavy metal elements are as shown in Table 1:

[0096] Table 1 Example 1 Waste incineration fly ash raw material content of main elements and heavy metal elements

[0097] element Al Ca Cu Fe K Mg Na Pb Zn Cl ％ 0.63 26.21 0.025 0.40 5.57 1.60 3.21 0.076 0.44 28.3

[0098] The waste incineration fly ash is washed, including the first washing and magnetic separation. The specific process is: washing-magnetic separation-washing-magnetic separation-washing. The pH of the first washing process is controlled to 10.5 by adding pH regulator hydrochloric acid. 50°C, washing time 1h. After the first washing, the weight of the waste incineration fly ash is reduced to 60kg, with a weight reduction rate of 40%, and 0.5kg of magnetic separation product is obtained.

[0099] Add a mixture of potassium ...

Embodiment 2

[0122] In this embodiment, 500kg of waste incineration fly ash from a waste incineration plant in a southern city is used. The main elements and heavy metal elements are as shown in Table 7:

[0123] Table 7 Example 2 Waste incineration fly ash raw material content of main elements and heavy metal elements

[0124] element Al Ca Cu Fe K Mg Na Pb Zn Cl ％ 1.12 27.63 0.36 0.13 3.44 1.32 2.33 0.02 0.99 26.8

[0125]The waste incineration fly ash is washed and selected, including the first washing and magnetic separation. The specific steps are: washing-magnetic separation-washing. During the washing process, the pH is controlled by adding pH regulator waste hydrochloric acid to 9.2, the washing temperature is 70 ° C, and the washing time is 0.5 h. After the first washing, the waste incineration fly ash was reduced to 325kg, with a weight reduction rate of 35%, and 0.8kg of magnetic separation product was obtained.

[0126] Add a mixtu...

Embodiment 3

[0140] This embodiment uses 800kg of waste incineration fly ash from a waste incineration plant in an eastern city, and the main elements and heavy metal elements are as shown in Table 9:

[0141] Table 9 Example 3 Waste incineration fly ash raw material content of main elements and heavy metal elements

[0142] element Al Ca Cu Fe K Mg Ni Na Pb Zn Cl ％ 0.21 22.92 0.12 1.58 3.09 0.63 0.23 1.96 0.11 0.52 27.2

[0143] The waste incineration fly ash is washed and separated, including the first washing and magnetic separation process. The specific steps are washing-magnetic separation-washing-magnetic separation-washing-magnetic separation. During the washing process, the pH is controlled to 8.5 by adding pH regulator waste hydrochloric acid The washing temperature was 80°C, and the washing time was 0.6h. After the first washing, the waste incineration fly ash was reduced to 498.4kg, with a weight loss rate of 37.7%, and 5.6kg of ma...

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Abstract

The invention belongs to the technical field of waste incineration fly ash treatment, and particularly relates to a resource utilization method of waste incineration fly ash. According to the method provided by the invention, soluble salt and magnetic substances in the waste incineration fly ash can be synchronously separated through washing, washing slag is subjected to second washing when the pH value is 6.5-8.0, and second washing slag is subjected to third washing when the pH value is 0.6-1.5. And step-by-step washing is carried out by controlling different pH values, and all extractable components in the garbage fly ash are respectively concentrated in different sections of washing liquid. According to the method, calcium salt and industrial salt extraction is carried out on the washing filtrate, calcium and heavy metal extraction is carried out on the second washing liquid and the third washing liquid, the final slag is used as a substitute raw material for building material preparation after high-temperature sintering or is directly prepared into building materials, and meanwhile dioxin is thoroughly decomposed during high-temperature treatment. According to the method provided by the invention, the garbage fly ash is completely recycled.

Description

technical field [0001] The invention belongs to the technical field of waste incineration fly ash treatment, and in particular relates to a resource utilization method of waste incineration fly ash. Background technique [0002] The use of incineration technology to treat domestic waste has the advantages of short treatment cycle, small footprint, high degree of reduction and energy recovery. With the development and maturity of technology, the proportion of domestic waste incineration is increasing year by year. In the process of waste incineration, 3-5% of incineration fly ash will be produced. Waste incineration fly ash contains 20% to 30% water-soluble salt, and also contains a variety of heavy metals and dioxins. It is a hazardous waste specified in the "National Hazardous Waste List". [0003] Common disposal methods for waste incineration fly ash include solidification and stabilization landfill, high-temperature melting, and co-processing in cement kilns. Among them...

Claims

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Application Information

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IPC IPC(8): C01F11/24C01D3/04C01G49/10C01G9/06C01G3/10C01G51/10C01G53/04C01F11/18C04B7/28C04B38/00C04B33/135C22B7/00C22B13/00C22B19/20C22B26/20C22B15/00C22B23/00B01J27/053B01J32/00
CPCC01F11/24C01D3/04C01G49/10C01G9/06C01G9/003C01G3/10C01G3/003C01G51/003C01G51/10C01G53/003C01G53/04C01F11/18C04B7/28C04B38/009C04B33/1355C22B7/007C22B13/045C22B19/22C22B19/26C22B26/20C22B15/0069C22B15/0071C22B23/0423C22B23/043B01J27/053Y02P40/60Y02P40/10Y02P10/20
Inventor 刘欣李凯胡清李贵珍陈彤刘文斌邱军付白玉婷张桐
Owner 陈彤
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