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Composite passivator for incineration fly ash of household garbage and restoration method for incineration fly ash of household garbage

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 repair, can solve the problems of low solidification, stability and binding efficiency of heavy metal anion groups and amphoteric heavy metal cations, and achieve significant economic and environmental benefits , the effect is obvious, and the effect of reducing costs

Active Publication Date: 2017-01-11
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 treatment object 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), chromium (11.27mg / L) in the domestic waste incineration fly ash Threshold is severely exceeded.

[0031] To formulate the composite passivator for household waste incineration fly ash of the present invention, in terms of mass percentage content, slag is 77%, clinker 14%, sodium metasilicate 4%, and hydroxyapatite 5%, wherein the 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 repairing method of the present invention, the above-mentioned slag and clinker are ...

Embodiment 2

[0035] The treatment object is fly ash from a waste incineration power plant in Wuhan. Its TCLP leaching data shows 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, beyond the threshold.

[0036] To formulate the composite passivator for household waste incineration fly ash of the present invention, in terms of mass percentage content, 65% of slag, 20% of clinker, 8% of slaked lime, and 7% of hydroxyapatite, wherein the slag is an active water-quenched particle 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 repairing method of the present invention, the above-...

Embodiment 3

[0040] The treatment object was fly ash from a domestic waste incineration power plant in Shenzhen. The TCLP leaching data showed that the TCLP leaching concentrations of lead and cadmium in the domestic waste incineration fly ash were 46.43 mg / L and 12.13 mg / L, respectively, exceeding the threshold.

[0041] To prepare the composite passivator of household waste incineration fly ash of the present invention, in terms of mass percentage, 85% of slag, 10% of clinker, 2% of calcium hydroxide, and 3% of hydroxyapatite. Among them, the slag is an active water-quenched granulated blast furnace slag, and the clinker is a product that meets the national standard for 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 household waste incineration fly ash were mixed and stirred, compacted and formed, and ma...

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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 of household waste incineration fly ash and a repairing method thereof. Background technique [0002] With the expansion of the scale of cities in my country, the improvement of the economic level and the improvement of people's living standards, the amount of garbage generated in the city is also increasing day by day. The incineration method can not only achieve heat recovery and utilization in the treatment of urban domestic garbage, but also has obvious reduction In recent years, it has been widely promoted and applied. However, the waste incineration fly ash produced in the incineration process is considered as hazardous waste in many countries due to the concentration of a large amount of heavy metals, and it must be treated harmlessly before its final disposal. [0003] At present, the harmle...

Claims

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Application Information

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Patent Type & Authority Applications(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