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A composite passivator for domestic waste incineration fly ash and its restoration method

A technology of domestic waste incineration and repair method, which is applied in the field of domestic waste incineration fly ash composite passivator and its repairing field, can solve the problems of low efficiency of solidification, stability and binding of heavy metal anion groups and amphoteric heavy metal cations, etc., and achieves significant economic and environmental benefits. , the effect is obvious, the effect of reducing the cost

Active Publication Date: 2019-04-05
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of low efficiency of solidification, stability and binding of heavy metal anion groups and amphoteric heavy metal cations in domestic waste incineration fly ash in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The object of treatment is the fly ash of a domestic waste incineration power plant in Guangzhou. The TCLP leaching data shows that the lead (12.32mg / L), barium (31.43mg / L) and chromium (11.27mg / L) in the domestic waste incineration fly ash Severely exceeded the threshold.

[0031] Prepare the domestic waste incineration fly ash composite passivator of the present invention, in terms of mass percentage content, slag 77%, clinker 14%, sodium metasilicate 4%, hydroxyapatite 5%, wherein, slag is active Water-quenched granulated blast furnace slag, clinker is a product that meets the national standard for cement clinker, and the total content of silica and alumina in slag and clinker accounts for 78% of the total mass of both slag and clinker; the above-mentioned domestic waste incineration The mass ratio of fly ash to the composite passivator is 3:1.

[0032] According to the restoration method of the present invention, firstly, the above-mentioned slag and clinker are un...

Embodiment 2

[0035] The object of treatment is fly ash from a waste incineration power plant in Wuhan. The TCLP leaching data show that the TCLP leaching concentrations of chromium, arsenic and lead in the domestic waste incineration fly ash are 13.43mg / L, 6.12mg / L and 8.32mg / L respectively. L, Threshold exceeded.

[0036] Prepare the domestic waste incineration fly ash composite passivator of the present invention, in terms of mass percentage content, slag 65%, clinker 20%, slaked lime 8%, hydroxyapatite 7%, wherein, slag is the water-quenched grain that has activity Blast furnace slag and clinker are products that meet the national standard for cement clinker. The total content of silica and alumina in slag and clinker accounts for 83% of the total mass of both slag and clinker; the above-mentioned domestic waste incineration fly ash and The mass ratio of the composite passivator is 5:1.

[0037] According to the restoration method of the present invention, firstly, the above-mentioned ...

Embodiment 3

[0040] The object of treatment is the fly ash of a household waste incineration power plant in Shenzhen. The TCLP leaching data show that the TCLP leaching concentrations of lead and cadmium in the household waste incineration fly ash are 46.43mg / L and 12.13mg / L respectively, exceeding the threshold.

[0041] The domestic waste incineration fly ash composite passivator of the present invention is prepared, in terms of mass percentage, slag 85%, clinker 10%, calcium hydroxide 2%, hydroxyapatite 3%. 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. 80%; the mass ratio of the above-mentioned domestic waste incineration fly ash to the composite passivator is 4:1.

[0042] According to the repair method of Example 1, the composite passivator of this example and the fly ash of domestic waste incineration were mixed and stirred, compacted and formed, and cured for 28 days.

[...

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Abstract

The invention provides a composite passivator for incineration fly ash of household garbage. The composite passivator is prepared from, by mass, 65-85% of slag, 8-20% of clinker, 2-8% of an alkaline activator and 3-10% of hydroxyapatite. Industrial solid wastes which are cheap and easy to acquire are adopted as raw materials of the composite passivator, so that cost reduction, waste recycling and pollution control are realized. A restoration method for incineration fly ash of household garbage is simple in operation; by mineral hydration of generated substances, heavy metal anion groups and amphoteric heavy metal cations in the incineration fly ash of household garbage are solidified and stabilized, evident effects are achieved, heavy metal leaching concentration can be decreased at the early stage of solidification, reaction can last in medium and long terms, and heavy metal leaching concentration keeps a reduction trend.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment and environmental protection, and in particular relates to a composite passivator 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. Compatible, harmless and other advantages, in recent years are being widely promoted and applied. However, the waste incineration fly ash produced during the incineration process is considered as hazardous waste in many countries due to the concentration of a large amount of heavy metals, and must be harmlessly treated before final disposal. [0003] At present, the harmless treatment methods for municipal waste incineration fly ash mainly include heat treatment (sintering, vitrification and melting), chemical agent sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/08
CPCC04B28/08C04B2111/00017C04B2111/00767C04B18/023C04B22/08C04B22/16C04B22/064
Inventor 邵雁李社锋王文坦陶玲赵波郭华军陈堃刘子豪覃慧徐秀英
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY