Rubbish-fly-ash and cement-kiln cooperation treatment method

Abstract

The invention relates to a rubbish-fly-ash and cement-kiln cooperation treatment method. The treatment method sequentially includes the technological steps of three-level washing desalting, and dioxin microorganism removing; heavy metal micellar-enhanced removing; nanofiltration; reverse osmosis pre-concentrating; slight-trace-carnallite removing; and MVR evaporative crystallization. Heavy metal and chloride ions in fly ash can be removed through the three-level washing desalting and dioxin microorganism removing technological step, and fly ash produced during dioxin microorganism erosion can be used as building materials. Heavy metal, most calcium and most magnesium in the fly ash can be removed through the heavy metal micellar-enhanced removing technological step, and precipitate is pre-dried to enter a cement kiln to be incinerated. The calcium and the magnesium left in washing water are removed through the nanofiltration technological step. The washing water can be concentrated to 6% to 8% through the reverse osmosis pre-concentrating technological step, and produced water can be used for washing. A slight trace of carnallite is removed through the slight-trace-carnallite removing technological step. Concentrated liquor is evaporated and separated to obtain industrial salt through the MVR evaporative crystallization technological step.

Description

Technical field: [0001] The invention relates to the processing technology field of incineration fly ash, and more specifically to a method for co-processing garbage fly ash in a cement kiln. Background technique: [0002] With the development of society and economy, the process of urbanization has intensified, and many large and medium-sized cities in my country have encountered the problem of "garbage siege". There are three ways of garbage disposal: landfill, incineration and composting. At present, our country's garbage disposal adopts landfilling as the main method, and composting and incineration as supplementary measures, which will occupy a lot of land resources. With the increase in land prices and the continuous improvement of urban environmental requirements, landfills have become no longer economical and safe, and more and more cities have begun to consider waste incineration. Incineration treatment can reduce the volume of municipal waste by 80-90%, and the waste re...

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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