Municipal solid waste incineration fly ash curing method

A technology of domestic waste incineration and waste incineration fly ash, which is applied in the direction of solid waste removal, etc., can solve the problems of secondary pollution, high energy and resource consumption, and high cost, and achieve the effect of reducing solidification costs and realizing waste utilization

Inactive Publication Date: 2015-05-13
CHONGQING UNIV
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Problems solved by technology

The stabilization of chemical agents is the process of transforming toxic and harmful substances into soluble, low-migration and low-toxicity substances through chemical reactions. The heavy metals in the water will be leached due to leaching, resulting in secondary pollution, and the cost is high
Cement solidification has become a pretreatment method for the final disposal of incineration fly ash that is widely used in the world because of its easy-to-obtain materials and good treatment effects. However, cement production consumes too much energy and resources.

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  • Municipal solid waste incineration fly ash curing method

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[0014] The domestic waste incineration fly ash solidification method of the present invention is to mix the waste incineration fly ash, strontium carbonate waste residue, potassium carbonate and cement in parts by mass of 40-50: 25-38: 3-6: 15-25, and then add an appropriate amount of pure water After stirring evenly, fill it into the forming model, squeeze and fill it, and then place it in the air for 24 hours before demoulding to obtain a solidified body; the solidified body can be cured to obtain a solidified body that can be directly buried. The time is not less than 14d.

[0015] Strontium slag is the product of roasting at 100-1200°, which cannot make the strontium slag into a molten state, so the strength of strontium carbonate waste slag is not high. However, in the presence of alkaline additives and water, it can produce a gel substance like cement hydration, forming a high-strength and low-permeability cement matrix. Add appropriate amount of potassium carbonate to ...

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Abstract

The invention discloses a municipal solid waste incineration fly ash curing method. The method comprises the steps of mixing waste incineration fly ash, cesium carbonate waste residue, potassium carbonate and cement according to the ratio of (40-50): (25-38): (3-6): (15-25); then, feeding right amount of purified water into the mixture, evenly mixing, enabling a molding model to be filled with the mixture, extruding and compacting; after that, standing the model in the air for 24 hours, and then demoulding to obtain a cured green body; maintaining the cured green body to obtain a cured body which can be directly buried, wherein the maintaining time is not shorter than 14 days. According to the method, the cesium carbonate waste residue is taken as an important raw material for curing the fly ash, so that the consumption of the cement is greatly reduced, waste recycling is realized, and the waste incineration fly ash curing cost is lowered. After the method is used, the compressive strength of the cured body and the heavy metal leaching completely meet the landfill requirements.

Description

technical field [0001] The invention relates to a technology for harmless treatment of domestic waste, in particular to a method for solidifying fly ash of domestic waste incineration, and belongs to the technical field of solidification treatment of domestic waste. Background technique [0002] Because waste incineration fly ash contains dangerous components such as heavy metals and organic pollutants (such as dioxin), it has been included in the list of hazardous waste by the state, so it must be treated innocuously before safe landfill and utilization. The solidification treatment of domestic waste incineration fly ash mainly considers two aspects: one is that the solidified body must have a certain compressive strength to reduce the environmental risk of leaching of harmful elements caused by the destruction of the solidified body; the other is the leaching of harmful elements in the solidified body The concentration meets the entry standard of the "Standards for Pollu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B1/00
Inventor 王里奥张宏良黄川李晓帆胥腾屯王磊
Owner CHONGQING UNIV
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