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House refuse burning fly ash curing stabilization gel material and repairing method using the same

A technology for domestic waste incineration and cementitious materials, which is applied in the field of domestic waste incineration fly ash solidification and stabilization of cementitious materials and its repair, can solve the problem of increased compatibilization ratio of fly ash solidified body, low curing stability and binding efficiency, and landfilling. The problem of increasing the field volume, etc., achieves the effect of obvious curing effect, no secondary pollution, and simple repair method.

Inactive Publication Date: 2017-02-15
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, whether it is Portland cement or improved Portland cement, the heavy metal pollutants tend to be stabilized through the formation of hard solids through hydration reactions. In order to achieve the penetration of heavy metals in the "Standards for Pollution Control of Domestic Waste Landfills" Requirements, the dosage must be as high as 40% to 70%, which will lead to a substantial increase in the volume ratio of the fly ash solidified body, a substantial increase in the volume of the landfill, and a significant increase in processing costs
Moreover, this method also exists for Zn 2+ , Pb 2+ Equal parts of divalent amphoteric heavy metal cations and high-valent heavy metal anion groups such as CrO 4 2- The problem of low binding efficiency such as solidification and stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 100g of the fly ash mixture of a waste incineration power plant in Guangzhou during different periods of normal operation, add 20g of domestic waste incineration fly ash solidified and stabilized cementitious material prepared, in terms of mass percentage, slag 70%, clinker 16%, chlorine Sodium chloride 5%, gypsum 5%, sodium metasilicate 4%, add 60g of water while stirring at room temperature, and finally form a thick and uniform mortar mixture, standard curing (temperature 25±3°C, relative humidity 99%) 7 sky. Among them, the slag is active water-quenched granulated blast furnace slag, and the clinker is a product that meets the national standard of cement clinker. After the two are mixed and mechanically milled, the specific surface area is greater than or equal to 550m 2 / kg, wherein the total content of silicon dioxide and aluminum oxide is 81%, and the mass ratio of silicon dioxide and aluminum oxide is 4.

[0023] Toxicity experiments were carried out on the...

Embodiment 2

[0025] The processing object of this embodiment is the fly ash of a waste incineration power plant in Wuhan. The leaching concentrations of Cr, As and Pb in the fly ash are 13.43mg / L, 6.12mg / L and 8.32mg / L respectively, exceeding the leaching concentrations threshold.

[0026] Get 100g of the above-mentioned fly ash of a certain waste incineration power plant in Wuhan, add 25g of prepared domestic waste incineration fly ash to solidify and stabilize the cementitious material, in terms of mass percentage content, slag 60%, clinker 20%, sodium chloride 4%, gypsum 10%, slaked lime 6%, add 75g of water while stirring at room temperature, and finally form a thick and uniform mortar mixture, standard curing (temperature 25 ± 3 ℃, relative humidity 99%) for 7 days. Among them, the slag is active water-quenched granulated blast furnace slag, and the clinker is a product that meets the national standard of cement clinker. After the two are mixed and mechanically milled, the specific su...

Embodiment 3

[0029] Prepare domestic waste incineration fly ash solidified and stabilized gelling material, in terms of mass percentage, slag 80%, clinker 10%, sodium chloride 3%, gypsum 3%, sodium hydroxide 4%, take the gelling material Add 17g to 100g of fly ash from a domestic waste incineration power plant in Shenzhen, add 55g of water while stirring at room temperature, and finally form a thick and uniform mortar mixture. Standard curing (temperature is 25±3℃, relative humidity is 99%) for 28 days . Among them, the slag is active water-quenched granulated blast furnace slag, and the clinker is a product that meets the national standard of cement clinker. After the two are mixed and mechanically milled, the specific surface area is greater than or equal to 550m 2 / kg, wherein the total content of silicon dioxide and aluminum oxide is 74%, and the mass ratio of silicon dioxide and aluminum oxide is 2.

[0030]Toxicity tests were carried out on the solidified and stabilized fly ash. The...

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Abstract

The invention provides a house refuse burning fly ash curing stabilization gel material. The material is prepared from 55-85% by mass of mineral waste residues, 5-25% by mass of a clinker, 0-10% by mass of sodium chloride, 0-10% by mass of gypsum and 2-8% by mass of an alkaline exciting agent. The house refuse burning fly ash curing stabilization gel material is prepared from cheap and easily available raw materials through simple and easy processes, is insensitive to ingredients of house refuse burning fly ash, can be used for curing stabilization treatment on most of fly ash, has obvious curing effects, guarantees heavy metal long-term stability, effectively prevents fly ash-caused secondary pollution on the environment, and solves existing pressing issues of the waste incineration plant and fly ash-caused damage to environmental protection and human body health.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment and environmental protection, and in particular relates to a solidified and stabilized gelling material for domestic waste incineration fly ash and a repair method thereof. Background technique [0002] With the expansion of the scale of cities in our country, the improvement of economic level and people's living standards, the amount of garbage generated in cities is also increasing. The incineration method has the advantages of obvious volume reduction, weight reduction, high efficiency, and heat recovery. It is widely used at home and abroad. However, the fly ash produced during the incineration process contains a large amount of harmful substances such as heavy metals, dioxins, and furans, and is listed as a heavy metal hazardous waste to be controlled. Transportation, and must enter a safe landfill for disposal, but the cost of safe landfill treatment is very high, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/00C04B7/153C04B28/00C04B18/08
CPCC04B7/1535C04B12/005C04B18/08C04B28/006Y02P40/10Y02W30/91
Inventor 邵雁王文坦郭华军李社锋陈堃朱文渊赵波陶玲覃慧刘子豪
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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