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Method for controlling dioxin in fly ash washing process through sintering treatment

A control method and sintering treatment technology, applied in the field of waste incineration fly ash treatment, can solve the problems of high chlorine content, affecting the quality of sintered ore, equipment corrosion, etc., to reduce secondary generation, prevent secondary generation, and facilitate centralized degradation. Effect

Pending Publication Date: 2021-11-16
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the high chlorine content in waste incineration fly ash in the prior art, its use in iron ore sintering process may cause corrosion to equipment and affect the quality of sintering ore and other technical problems

Method used

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  • Method for controlling dioxin in fly ash washing process through sintering treatment

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Effect test

Embodiment 1

[0041] The grate furnace garbage incineration fly ash was washed to obtain washed fly ash with a Cl content of 0.7%, and the washed fly ash was made into 5mm pellets, and the CaO / SiO in the washed fly ash pellets 2 The mass ratio is 2.5. Before drying, wrap a layer of slaked lime (the activity of quicklime is 270ml) with a thickness of 1 mm, and dry at 100°C for 2 hours at a low temperature until the water content is 5%. 60% iron ore, 4% coke powder (-0.5mm, 0.5~3mm and 3~5mm accounted for 20%, 60%, 20% respectively), 11% limestone, 25% returned ore were mixed to make When the granulation progresses to the 5th minute, evenly add water-washed fly ash pellets coated with quicklime along the horizontal axis of the cylinder. The water-washed fly ash pellets are fully mixed with the sintering raw materials. Use a nine-roll distributor (the gap between the 5#~9# rollers is controlled to be 5~8mm) to spread the obtained sintered mixture with water-washed fly ash pellets on the midd...

Embodiment 2

[0043] The grate furnace waste incineration fly ash was washed with water to obtain washed fly ash with a Cl content of 1.0%, and the washed fly ash was made into 8mm pellets, and the CaO / SiO in the washed fly ash pellets 2 The mass ratio is 3.0. Before drying, wrap a layer of 0.5mm thick slaked lime (the activity of quicklime is 250ml), and dry at 80°C for 3 hours at a low temperature until the water content is 9%. 65% iron ore, 4.5% coke powder (-0.5mm, 0.5~3mm and 3~5mm accounted for 20%, 60%, 20% respectively), 10.5% limestone, 20% returned ore and other sintering raw materials Mixing and granulation. When the granulation reaches the 3rd minute, add washed fly ash pellets coated with slaked lime evenly along the horizontal axis of the cylinder. The amount of washed fly ash pellets added is 5.0% of the sintering raw materials, and continue to granulate for 1 minute. , so that the water-washed fly ash pellets are fully mixed with the sintering raw materials. Use a nine-rol...

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Abstract

The invention discloses a method for controlling dioxin in a fly ash washing process through sintering treatment, which comprises the following steps: carrying out washing dechlorination treatment on waste incineration fly ash, performing pelletizing, coating the surfaces of pellets with a slaked lime layer, and carrying out drying to obtain washed fly ash pellets; and mixing the washed fly ash pellets into the iron ore sintered granules to be uniformly mixed, distributing the mixture to the middle lower part of a sintered material layer through segregation, and performing igniting and sintering. According to the method, the waste incineration fly ash is subjected to washing dechlorination, secondary generation of dioxin in the sintering process can be greatly reduced, meanwhile, the surfaces of the washing fly ash pellets are coated with slaked lime, chlorine volatilized by the washing fly ash ball material and surrounding sintering materials can be adsorbed, and by optimizing the distribution and sintering technology, the dioxin in the fly ash is effectively degraded, and secondary generation of the dioxin in the sintering process is inhibited. According to the method, secondary generation of the dioxin can be effectively inhibited under the condition that the quality of the sintered ore is not affected, and clean resource utilization of the waste incineration fly ash is promoted.

Description

technical field [0001] The present invention relates to a method for processing waste incineration fly ash, in particular to a method for co-processing waste incineration fly ash by using iron ore sintering process, and in particular to a method for washing out chlorine from waste incineration fly ash and using iron ore sintering The invention discloses a method for realizing the decomposition of persistent organic matter such as dioxin in washed fly ash, belonging to the technical field of waste incineration fly ash treatment. Background technique [0002] According to the definition in my country's "Standards for Pollution Control of Domestic Waste Incineration" (GB18485-2014), incineration fly ash (IFA) refers to the trappings of the flue gas purification system and the bottom ash settled at the bottom of the flue and chimney. Small particles and volatile substances are taken from the combustion chamber to air pollution control systems (APCDs), where solid residues are se...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00Y02P10/20
Inventor 甘敏黄斌斌范晓慧卢四平周志安钟伟季志云孙增青许澧鸣徐莉陈许玲黄晓贤王翔赵倩倩袁瑞瑞
Owner CENT SOUTH UNIV
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