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Waste incineration fly ash sintering reduction treatment technique

A technology of waste incineration fly ash and technology, which is applied in the field of waste incineration fly ash sintering reduction treatment, can solve the problems of high heavy metal content in fly ash sintering and potential hazards in resource utilization, and achieves low long-term potential impact and recycling. The effect of improved utilization efficiency, lower energy consumption and lower treatment costs

Active Publication Date: 2014-10-01
TIANJIN YIMING ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the problem is that the content of heavy metals in sintered fly ash after this process is still high, and there are potential hazards in resource utilization.

Method used

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  • Waste incineration fly ash sintering reduction treatment technique
  • Waste incineration fly ash sintering reduction treatment technique
  • Waste incineration fly ash sintering reduction treatment technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Get 1 ton of waste incineration fly ash, measure the total salt content of waste incineration fly ash to be 18.8%, mix the three according to the mass ratio of waste incineration fly ash: dechlorination co-solvent: water=88: 2: 10 Uniform, granulated and shaped, the green body has a diameter of 10mm and a length of 10mm, and the dechlorination co-solvent is activated alumina and sodium carbonate;

[0024] (2) The sintered green body is sintered at 550°C for 28 minutes, and the flue gas generated by sintering is rapidly cooled to lower the temperature of the flue gas to below 200°C, and then collected twice by an electrostatic collector Fly ash, the secondary fly ash is 5.6% (dry weight) of the original ash;

[0025] (3) The collected secondary fly ash is stirred with leachate and washed with water. The washed fly ash is 15.2% (dry weight) of the secondary fly ash. The waste heat is evaporated and concentrated to recover salt, and the concentrated solution and sludg...

Embodiment 2

[0031] (1) Get 1 ton of waste incineration fly ash, measure the total salt content of waste incineration fly ash to be 15.6%, mix the three according to the mass ratio of waste incineration fly ash: dechlorination co-solvent: water=80: 12: 8 Uniform, granulated and shaped, the green body is 10mm in diameter and 10mm in length, and the dechlorination co-solvent is activated alumina and fluorite;

[0032] (2) The sintered green body is sintered at 850°C for 20 minutes, and the flue gas generated by sintering is treated with rapid cooling to reduce the temperature of the flue gas to below 200°C, and then collected twice by a bag filter Fly ash, the secondary fly ash is 6.3% (dry weight) of the original ash;

[0033] (3) Stir the collected secondary fly ash with MBR effluent and wash it with water. The washed fly ash is 18.4% (dry weight) of the secondary fly ash. The fly ash is returned to the sintering device for sintering again. The waste heat is evaporated and concentrated to...

Embodiment 3

[0038] (1) Get 1 ton of waste incineration fly ash, measure the total salt content of waste incineration fly ash to be 13.3%, mix the three according to the mass ratio of waste incineration fly ash: dechlorination co-solvent: water=76:15:9 Uniform, granulated and shaped, the green body has a diameter of 6mm and a length of 8mm, and the dechlorination auxiliary solvent is iron oxide and potassium carbonate;

[0039] (2) The sintered green body is sintered at 1000°C for 10 minutes, and the flue gas generated by sintering is treated with rapid cooling to reduce the temperature of the flue gas to below 200°C, and then collected twice by a bag filter Fly ash, the secondary fly ash is 8.1% (dry weight) of the original ash;

[0040](3) Stir the collected secondary fly ash with RO concentrated water for water washing. The washed fly ash is 21.5% (dry weight) of the secondary fly ash, and return to the sintering device for sintering again. Evaporation and concentration treatment recov...

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Abstract

The invention relates to a waste incineration fly ash sintering reduction treatment technique which is especially applicable to treatment and disposition of waste incineration fly ash of which the salt content is lower than 20%. The fly ash is added with a dechloridation fusing assistant to intensify the volatilization of heavy metals and the decomposition of dioxin, heavy metals and chlorine salt are intensively concentrated in secondary fly ash within a relatively low temperature range, and then the secondary fly ash is washed by water so as to further realize concentration of pollutants and reduction of the fly ash. The water-washed fly ash is returned to a rapid sintering device so as to completely degrade dioxin type pollutants; water-washing liquid is evaporated and concentrated to recycle the salt by using the afterheat of a sintering system, the concentrated liquid and mud obtained by evaporation and the obtained sintered body are safely buried or recycled. The treatment technique disclosed by the invention is relatively simple in overall process and equipment, the energy consumption and the treatment cost are relatively low, the environmental friendliness of the obtained end product is improved, and the long-term potential impacts of the fly ash on the environment are minimized.

Description

technical field [0001] The technology relates to a waste incineration fly ash sintering reduction treatment technology, which belongs to the technical field of hazardous waste treatment and disposal. Background technique [0002] The waste incineration process will produce 3 to 15% of waste incineration fly ash, which contains high concentrations of heavy metals, dioxin-like pollutants and a large amount of salts, causing serious harm to the environment and human health, and is designated as dangerous Waste, special handling required. At the end of the "Twelfth Five-Year Plan", 380 waste incineration power plants will be built nationwide, and the annual fly ash output will be close to 4 million tons. A large amount of fly ash needs to be properly disposed of. [0003] At present, fly ash treatment methods mainly include solidification method, drug stabilization method, acid precipitation method, melting method and sintering method, etc. High temperature treatment methods su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
Inventor 张曙光王娟娟李萍
Owner TIANJIN YIMING ENVIRONMENTAL TECH CO LTD
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