Waste incineration fly ash recycling process technology

Abstract

The invention relates to the technical field of fly ash treatment, in particular to an incineration waste fly ash recycling process technology which comprises the following steps: mixing fly ash, a stabilizer, a calcium-based alkaline cementing material and water according to a certain proportion, reacting, preparing and forming to obtain a granular semi-finished product; wherein the stabilizer at least comprises one or more of dithiocarbamic acid (D T C), ethylenediamine tetraacetic acid (ED TA), citric acid, polyphosphoric acid and glycine; carrying out drying treatment on the granular semi-finished product; and washing the dried semi-finished product to obtain a washed finished product. Harmful substances such as heavy metal complexes and dioxin in the finally prepared finished product are cemented together, so that the possibility of secondary pollution is avoided, the product can be used for preparing admixtures, baking-free bricks and the like, the application is wide, and the purpose of recycling the fly ash is achieved.

Description

【Technical field】 [0001] The invention relates to the technical field of fly ash treatment, in particular to a technology for recycling fly ash from incineration garbage. 【Background technique】 [0002] At present, the best treatment method for a large amount of domestic waste is waste incineration, which can not only remove combustible carcinogens, viral pollutants, and highly toxic organic substances in the waste, but also can be used for waste due to its high combustion heat. Incineration to generate electricity. [0003] Since domestic waste incineration is a violent high-temperature thermochemical reaction process, flue gas purification has been solved. However, the purification system traps and captures fine particulate matter - the "fly ash" of domestic waste incineration is becoming more and more "dirty" and is enriched with more toxic heavy metals, soluble salts and dioxin pollutants, so "fly ash" is becoming more and more "dirty". Ash" is defined internationally ...

AI Technical Summary

Problems solved by technology

At present, only about 80% of the fly ash discharged by municipal solid waste incineration power plants in the country is landfilled according to national standards, that is, after the fly ash is standardized, stabilized and safe to meet the standards, it is then landfilled; About 20% of the fly ash discharged from domestic waste incineration power plants is still in irregular landfills

[0007] However, landfilling will take up a large amount of land in the country

According to statistics, my country will produce about 10 million tons of fly ash from incineration of garbage in 2021, and the landfill will occupy about 5,000 mu of land, which will occupy a large amount of land resources, and after a certain period of time, it is inevitable that there will be a large number of broken bags, landslides and Phenomena such as mudslides and dam failures pose great safety hazards, and there are risks such as polluting groundwater, soil, and producing odors.

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