Fly ash multi-stage recycling treatment device and process

Abstract

The invention discloses a fly ash multi-stage recycling treatment device. The fly ash multi-stage recycling treatment device comprises a first-section rotary kiln, a second-section rotary kiln, a crystallization device, a first high-temperature dust remover and a waste gas treatment device, wherein the tail parts of the first-section rotary kiln and the second-section rotary kiln are provided withan exhaust port and a discharge port correspondingly; the exhaust port of the first-section rotary kiln communicates with an air inlet of the first high-temperature dust remover; the exhaust port ofthe first high-temperature dust remover communicates with the waste gas treatment device; a dust discharge port of the first high-temperature dust remover communicates with a collecting device; the discharge port of the first-section rotary kiln communicates with a feeding port of the second-section rotary kiln; and the exhaust port of the second-section rotary kiln communicates with the crystallization device. The invention further provides a fly ash multi-stage recycling treatment process. According to the fly ash multi-stage recycling treatment device and process, chlorine salt and a smallamount of heavy metal are separated from light fly ash through a two-stage combustion process, the chlorine salt and the small amount of heavy metal can also be used as industrial salt after being treated by a subsequent process in the later period, the separated light fly ash is subjected to dust removal through the high-temperature dust remover, then dust is collected and used for producing light bricks, and secondary pollutants are basically not generated.

Description

technical field [0001] The invention relates to the field of fly ash recycling, in particular to a fly ash multi-stage recycling treatment device and process. Background technique [0002] At present, incineration fly ash will be produced in the domestic municipal waste incineration process. The fly ash contains 20-40% CaO, 25-25% chloride salt and a small amount of heavy metals. In order to comprehensively utilize the fly ash, the fly ash is incinerated at high temperature to make ceramsite products It is a better way of resource utilization of solid and hazardous waste. [0003] The resource utilization method of making fly ash into ceramsite products through high-temperature incineration not only makes effective use of part of the calorific value in fly ash, but also makes non-toxic and harmless ceramsite products from the non-combustible part of fly ash , but there is a thorny problem in the process of this kind of resource utilization, that is, after firing ceramsite, ...

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Problems solved by technology

[0003] The resource utilization method of making fly ash into ceramsite products through high-temperature incineration not only makes effective use of part of the calorific value in fly ash, but also makes non-toxic and harmless ceramsite products from the non-combustible part of fly ash , but there is a thorny problem in the process of this kind of resource utilization, that is, after firing ceramsite, the light fly ash produced, chlorine salt and a small amount of heavy metals are mixed together to form secondary pollutants, which cannot really achieve solid hazards. Waste resource utilization, a large amount of light fly ash can not be effectively utilized

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