Technology for reducing waste incineration fly ash via water logging pretreatment

A waste incineration fly ash and waste incineration technology, applied to the removal of solid waste, etc., can solve the problems of potential hazards in resource utilization of slag, unrealized purification and removal of heavy metals, and limited processing capacity

Inactive Publication Date: 2014-10-08
TIANJIN YIMING ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the common technical defect of the fly ash sintering technology at home and abroad is that the purification and removal of heavy metals has not been realized before the fly ash enters the furnace, resulting in a large amount of volatilization of heavy metals during the high-temperature sintering process, and the cyclic enrichment in the kiln causes skinning or smoke. Secondary hazards are caused by gas discharge, and the implementation of treatment technology requires the construction of a special treatment plant and a complete set of treatment equipment. The construction investment cost is high, the treatment capacity is limited, and the reproducibilit

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  • Technology for reducing waste incineration fly ash via water logging pretreatment
  • Technology for reducing waste incineration fly ash via water logging pretreatment
  • Technology for reducing waste incineration fly ash via water logging pretreatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Mix the waste incineration fly ash with a salt content of 22% and the leachate uniformly in the soaking tank. The ratio of the waste incineration fly ash to the leachate is 1:1, soak for 1.5 days, and stir regularly;

[0025] (2) After the ash-water mixture is formed by pressure filtration, the filter cake is sent to a garbage incinerator for high-temperature calcination. The sintering temperature is 900°C. The captured secondary fly ash is 2.2% of the original fly ash. The calcined fly ash is finally The furnace body is discharged in the form of slag, and the primary filtrate is returned to step (1) for reuse, and after being reused 5 times, it is discharged as a heavy metal rich liquid out of the circulating washing system;

[0026] (3) The heavy metal rich liquid is added with heavy metal trapping agent to separate heavy metals from the water body in the form of flocculated sediment, and then the heavy metal mortar is separated from the water body through microfiltrati...

Embodiment 2

[0032] (1) Mix the waste incineration fly ash with a salt content of 25.3% and the MBR effluent evenly in the soaking tank. The ratio of waste incineration fly ash and MBR effluent is 1:2, soak for 2 days, and stir regularly;

[0033] (2) After the ash-water mixture is formed by pressure filtration, the filter cake is sent to the garbage incinerator for high-temperature calcination. The sintering temperature is 950℃. The captured secondary fly ash is 2.5% of the original fly ash. The furnace body is discharged in the form of slag, and the primary filtrate is returned to step (1) for reuse, and after being reused 4 times, it is discharged out of the circulating washing system as a heavy metal rich liquid;

[0034] (3) The heavy metal rich liquid is added with a coagulant to precipitate heavy metals from the water body in the form of flocculated sediments, and then the heavy metal mortar is separated from the water body through ultrafiltration and nanofiltration, and the heavy metal m...

Embodiment 3

[0040] (1) Mix the waste incineration fly ash with a salt content of 27.2% and the RO concentrated water evenly in the soaking tank. The ratio of the waste incineration fly ash and RO concentrated water is 1:3, soak for 3 days, and stir regularly;

[0041] (2) After the ash-water mixture is formed by pressure filtration, the filter cake is sent to the garbage incinerator for high-temperature calcination. The sintering temperature is 1000°C. The captured secondary fly ash is 2.9% of the original fly ash. The calcined fly ash is finally The furnace body is discharged in the form of slag, and the primary filtrate is returned to step (1) for reuse, and after being reused 3 times, it is discharged as a heavy metal rich liquid out of the circulating washing system;

[0042] (3) The heavy metal rich liquid is added with heavy metal trapping agent to precipitate heavy metals from the water body in the form of flocculated sediment, and then the heavy metal mortar is separated from the water ...

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Abstract

The invention relates to a technology for reducing waste incineration fly ash via water logging pretreatment, and the technology is particularly suitable for the treatment of waste incineration fly ash with salt content higher than 20%. A water logging dechlorination manner is used for treating waste incineration fly ash; by prolonging the logging time, the water consumption is greatly reduced, a subsequent wastewater treatment process is simplified at the same time and a soluble salt resource is recycled; before fly ash enters into a furnace, most of heavy metals and chlorine salts are removed, a matrix of fly ash is purified, and by virtue of existing incineration equipment of waste incineration power plants, pollutants such as dioxin are thoroughly degraded, so that the overall normal running of a waste incineration line is ensured and the harmless and reduction treatment of waste incineration fly ash is realized. The technology has a characteristic of correct in-situ treatment, and is simple in process and low in investment and operation costs; by gathering most of heavy metals and salts in heavy metal plaster and gathering little of the two in secondary fly ash, the reduction of waste incineration fly ash is realized, and then a favorable foundation is laid for the subsequent further treatment or resource utilization.

Description

Technical field [0001] The technology relates to a water immersion pretreatment reduction technology for waste incineration fly ash, and belongs to the technical field of hazardous waste treatment and disposal. Background technique [0002] The waste incineration process will produce 3-15% of waste incineration fly ash, which contains high concentrations of heavy metals, dioxin pollutants and a large amount of salt, which causes serious harm to the environment and human health, and is defined as dangerous Waste requires special treatment. At the end of the "Twelfth Five-Year Plan" period, the country plans to build 380 waste incineration power plants, and the annual fly ash output will approach the 4 million tons mark. A large amount of fly ash urgently needs to be properly disposed of. [0003] At present, fly ash treatment methods mainly include solidification method, agent stabilization method, acid precipitation method, melting method and sintering method. High temperature tre...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00A62D3/33
Inventor 张曙光王娟娟李萍
Owner TIANJIN YIMING ENVIRONMENTAL TECH CO LTD
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