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Stable curing agent for waste incineration fly ash and method for treating urban domestic waste incineration fly ash

A technology for waste incineration fly ash and municipal solid waste, applied in the field of waste stabilization and solidification, can solve the problems of excessive energy and resource consumption, large volume increase of solidified blocks, and poor adaptability, so as to achieve easy promotion and application, and reduce cement The effect of low consumption and cost

Inactive Publication Date: 2016-05-18
HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) Landfill as hazardous waste after proper disposal, but the treatment cost is high
[0005] Chemical stabilization is the process of transforming toxic and harmful substances into substances with low solubility, low migration and low toxicity through chemical reactions. The heavy metals in the material will be leached due to leaching, resulting in secondary pollution, and the cost is high
Cement solidification has become a pretreatment method commonly used in the world for the final disposal of incineration fly ash because of its easy-to-obtain materials and good treatment effects. Too big

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] For the fly ash collected in the furnace after combustion in a domestic waste incineration plant, the sodium sulfide and quicklime were weighed at a mass ratio of about 3:1, and the total mass of sodium sulfide and quicklime was calculated as 5% of the fly ash mass, and then mixed evenly. Dissolve in water and stir to form an aqueous solution. The mass ratio of solution to fly ash is about 1:3. Mix the above aqueous solution with fly ash and cement with about 10% fly ash and stir evenly, inject mold and cure for one week to form a solidified block. Concentrations are 0.341mg / L, 0.107mg / L, 0.183mg / L, which are all lower than the entry control standards for domestic waste landfills. Compared with the original fly ash, the capacity increase rate is only 0.436, and the total treatment cost is lower than 300 yuan / tonne.

Embodiment 2

[0034] For the fly ash collected in the furnace after burning in a domestic waste incineration plant, weigh gypsum and quicklime at a mass ratio of about 1.5:1, and calculate the total mass of sodium sulfide and quicklime as 7% of the fly ash mass, then mix them evenly, and use water Dissolve and stir into an aqueous solution, the mass ratio of solution to fly ash is about 1:2.5. Mix and stir the above aqueous solution with fly ash and about 10% fly ash cement evenly, inject mold for curing for one week, and form a solidified block. After standard curing for 7 days, the unconfined compressive strength of the test block is 0.28MPa. Concentrations are 0.297mg / L, 0.087mg / L, 0.163mg / L respectively, all of which are lower than the entry control standards for domestic waste landfills. Compared with the original fly ash, the capacity increase rate is only 0.576, and the total treatment cost is lower than 350 yuan / tonne.

Embodiment 3

[0036] For the fly ash collected in the furnace after combustion in a domestic waste incineration plant, disodium hydrogen phosphate and quicklime were weighed at a mass ratio of about 4:1, and the total mass of sodium sulfide and quicklime was calculated as 5% of the fly ash mass, and then mixed Uniform, dissolved in water, stirred into an aqueous solution, the mass ratio of solution to fly ash is about 1:4. Mix the above aqueous solution with fly ash and cement with about 10% fly ash and stir evenly, inject and cure for one week to form a solidified block. Concentrations are 0.344mg / L, 0.137mg / L, 0.213mg / L respectively, all of which are lower than the entry control standards for domestic waste landfills. Compared with the original fly ash, the capacity increase rate is only 0.376, and the total treatment cost is lower than 350 yuan / tonne.

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PUM

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Abstract

The invention discloses a stable curing agent for waste incineration fly ash and a method for treating urban domestic waste incineration fly ash. The stable curing agent is prepared from a heavy metal stabilizing agent, water and cement. The raw materials in the stable curing agent are easy to obtain, medicament cost is low, the use amount of cement is small, a curing body is stable, and secondary pollution of the environment is not caused. The stable curing agent is used for treating the urban domestic waste incineration fly ash and has the dual effects of stabilizing and curing, an obtained cured block is stable in physical and chemical property, the use amount of the cement is reduced, the compatibilization ratio of the curing block is reduced, and harm of incineration fly ash to human bodies and the ecological environment is effectively eliminated.

Description

technical field [0001] The invention relates to a stable solidifying agent for waste incineration fly ash and a method for treating municipal solid waste incineration fly ash, in particular to a stabilizing and curing treatment for municipal solid waste incineration fly ash containing high concentrations of heavy metals such as Pb, Cd and Ni The method belongs to the technical field of garbage stabilization and solidification treatment. Background technique [0002] With the rapid development of my country's waste incineration treatment technology, the output of waste incineration fly ash is also increasing day by day. The diffusion of dioxin and heavy metal elements in the fly ash of waste incineration into the air, soil and water will cause serious environmental pollution and endanger the survival of humans and other organisms. Therefore, how to properly deal with the fly ash produced by waste incineration has become a problem for many waste treatment plants. Problems to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B22/16
CPCC04B28/00C04B2111/00767
Inventor 罗文连戴孙强贺治国蒋燚史卫华李晶
Owner HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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