Fly ash treatment technology in waste incineration process

Abstract

The invention provides a fly ash treatment technology in a waste incineration process. The fly ash treatment technology comprises the following steps of conducting high-temperature heat treatment, magnetic separation metal treatment, washing for dichlorination, vacuum filtration and dehydration, suction filtration treatment, heavy metal precipitation, dilution and wastewater purification on fly ash. According to the fly ash treatment technology, by conducting high-temperature heat treatment on the fly ash, highly-toxic dioxin-like substances contained in the fly ash can be decomposed and purified to avoid the situation that the highly-toxic dioxin-like substances are discharged in air and cause environmental pollution; by conducting magnetic separation metal treatment on the fly ash, granular metal mixed in the fly ash can be recycled; by conducting aftertreatment on filter residues finally obtained after fly ash treatment, the rate of multipurpose utilization of the filter residues can be increased, and the filter residues can be used as rough fertilizer for secondary use; and by purifying the wastewater generated in the fly ash treatment process, secondary pollution caused by thewastewater can be reduced, it is ensured that no secondary pollutants are produced in the process of fly ash treatment, and environmental sustainability is achieved.

Description

technical field [0001] The invention relates to the technical field of waste incineration treatment, in particular to a fly ash treatment process in a waste incineration process. Background technique [0002] In the process of urbanization, garbage as a product of urban metabolism is the burden of urban development. Many cities in the world have been surrounded by garbage. The average annual growth rate of garbage in the world is 8.42%, while the growth rate of garbage in China is more than 10%. The world produces 490 million tons of garbage every year, and China alone produces nearly 150 million tons of municipal waste every year. up to 7 billion tons. [0003] At present, the treatment method of domestic waste is transitioning from landfill to incineration. Waste incineration is a waste treatment method that has been practiced for many years. Compared with landfill, it occupies a smaller area and has higher efficiency. It was once regarded as a kind of A good way to "red...

AI Technical Summary

Problems solved by technology

However, a large amount of flue gas will be produced in the process of waste incineration, and a large amount of fly ash will be produced in the process of purifying the flue gas. The amount of fly ash produced by waste incineration in my country does not match the amount produced, and about 50% of the fly ash has not been obtained. Properly disposed of, and waste incineration fly ash is a recognized hazardous waste, which concentrates a large amount of heavy metals (such as mercury, cadmium, lead, etc.) At the same time, a large amount of wastewater generated in some existing fly ash treatment processes has not been effectively treated, which will produce secondary pollutants, which is not conducive to the development of scientific fly ash treatment