A method for co-processing waste fly ash cement kiln and harmless resource recycling

Abstract

The invention relates to a co-processing method of waste fly ash cement kiln and harmless resource recycling, including three-stage water washing desalination process; coagulation sedimentation removal process for heavy metals; membrane distillation concentration process; extremely trace miscellaneous salt removal process; three-effect evaporation crystallization process. Its three-stage water washing and desalination process can remove heavy metals and chloride ions in fly ash. Fly ash containing water and dioxins and fly ash containing less than 1% chloride ions enter the cement kiln and incinerate above 1400 ° C. After the fly ash becomes cement raw materials , Dioxins are cracked above 800°C; heavy metal removal by coagulation and precipitation process can remove various metal ions in fly ash, and the precipitate is pre-dried and then sent to cement kiln for incineration; membrane distillation concentration process can remove the rest of the chlorine in the solution ions and the distilled water produced can be recycled; the extremely trace impurity salt removal process removes the extremely trace impurity salt and the heat energy can be recycled; the three-effect evaporation crystallization process evaporates and separates the high-salt concentrated liquid to obtain industrial salt for papermaking processes, deicing agents and Chlor-alkali industry.

Description

Technical field: [0001] The invention relates to the field of processing technology of incineration fly ash, and more specifically relates to a method for co-processing garbage fly ash in a cement kiln and recycling and utilizing harmless resources. Background technique: [0002] With the development of social economy and the intensification of urbanization process, many large and medium-sized cities in my country are troubled by "garbage siege". There are three ways of waste disposal: landfill, incineration and composting. At present, landfill is the main method of waste disposal in my country, supplemented by composting and incineration, which will occupy a large amount of land resources. With the rise of land prices and the continuous improvement of urban environmental requirements, garbage landfill has become uneconomical and safe, and more and more cities have begun to consider garbage incineration. Incineration treatment can reduce the volume of urban garbage by 80-90...

AI Technical Summary

Problems solved by technology

On the one hand, the cost of fly ash disposal is high

On the other hand, due to the unregulated market, inadequate supervision and vicious competition, the "fly ash" is in a state of "flying randomly".

If fly ash cannot be disposed of safely, it will be a great hidden danger to the environment

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