A clean treatment process for recycling waste fly ash and metallurgical dust

A technology for garbage fly ash and cleaning treatment, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc. Reduce environmental hazards and achieve effective degradation

Active Publication Date: 2019-05-10
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, in the process of using high-temperature treatment of waste fly ash, due to the high Cl content in waste fly ash, it is easy to corrode equipment, and high-temperature treatment of waste fly ash alone has problems such as high energy consumption and large investment

Method used

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  • A clean treatment process for recycling waste fly ash and metallurgical dust
  • A clean treatment process for recycling waste fly ash and metallurgical dust
  • A clean treatment process for recycling waste fly ash and metallurgical dust

Examples

Experimental program
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Effect test

Embodiment 1

[0037] figure 1 , figure 2 As shown, a waste fly ash and metallurgical dust resource clean disposal process adopts the following steps in sequence:

[0038] Taking the treatment of garbage fly ash and metallurgical dust produced in a large city in my country as an example, the urban garbage fly ash, metallurgical dust, and coal powder are mixed according to the dosage ratio of 1:2:0.2, and then mixed by a powerful mixer ;

[0039] The mixed material is made into pellets with a particle size of 8mm by a disc pelletizer;

[0040] Distribute the balls evenly on the trolley through the distributor, and dry them through drying stage I. The temperature of the drying hot air is 80°C, the drying time is 30 minutes, and the gas flow rate is 1.8m / s. Most of the water in the balls is removed, and the flue gas can be directly emission;

[0041] The pellets enter the drying stage II and are blown to dry. The drying temperature is 500°C, the drying time is 6 minutes, and the gas flow ra...

Embodiment 2

[0047] figure 1 , figure 2 As shown, a waste fly ash and metallurgical dust resource clean disposal process adopts the following steps in sequence:

[0048] Taking the treatment of garbage fly ash and metallurgical dust produced in a large city in my country as an example, the urban garbage fly ash, metallurgical dust, and coal powder are mixed according to the dosage ratio of 1:5:0.3, and then mixed by a powerful mixer ;

[0049] Utilize the disc pelletizer to make the pellets with a granularity of 16mm from the mixed material;

[0050] Distribute the balls evenly on the trolley through the distributor, and dry them through drying stage I. The temperature of the drying hot air is 150°C, the drying time is 15 minutes, and the gas flow rate is 2.4m / s. Most of the water in the balls is removed, and the flue gas can be directly emission;

[0051] The pellets enter the drying stage II and are blown to dry. The drying temperature is 600°C, the drying time is 3 minutes, and the ...

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Abstract

The invention discloses a resource cleaning process of waste fly ash and metallurgical dust. The process is to mix the waste fly ash, metallurgical dust and coal powder into small balls, and then use two-stage drying, one-stage roasting, and two-stage drying. It is processed by the process of cooling in the first stage, the moisture of the pellets is removed in the drying stage I, the dioxins are degraded and the fly ash volatiles are removed in the drying stage II, and the dry exhaust gas is circulated to the roasting section. In a high temperature environment, further remove dioxin and burn volatiles, consolidate the pellets into ore in the roasting section, and at the same time volatilize K, Na, Pb, Zn, etc. in the garbage fly ash and metallurgical dust into the flue gas. It is recycled. The exhaust gas from the cooling section I is circulated to the drying section II as a heat source, and the exhaust gas from the cooling section II is circulated to the drying section I as a heat source, which not only makes full use of the waste heat, but also makes the garbage fly ash and metallurgical dust be used cleanly as a resource.

Description

technical field [0001] The invention relates to a process for synergistic treatment of garbage fly ash and metallurgical dust, in particular to a process for realizing resourceful cleaning of garbage fly ash and metallurgical dust through a combination of two-stage drying, one-stage roasting, and two-stage cooling. Iron and steel metallurgical solid waste and waste incineration power generation fly ash treatment technology field. Background technique [0002] Waste incineration fly ash is the fine particle matter captured in the flue gas purification system and heat recovery system of waste incineration plants, accounting for about 3-5% of the amount of waste incinerated. Incineration fly ash contains easily leached heavy metal pollutants and highly toxic dioxins. According to the "National Hazardous Waste List" implemented in my country on August 1, 2016, waste incineration fly ash belongs to HW18, which is a hazardous waste. Environmental and human health hazards are enorm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
CPCB09B3/00B09B2101/30B09B3/40
Inventor 甘敏范晓慧周志安刘水石汪国靖陈许玲姜涛李光辉袁礼顺季志云王壮壮黄柱成杨永斌郭宇峰张元波李骞朱忠平吕薇周阳
Owner CENT SOUTH UNIV
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