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Flyash treatment method for waste incineration

A technology for incinerating fly ash and medical waste, applied in the field of environmental pollution control, can solve the problems of high equipment cost, small incineration treatment capacity, easy high temperature volatilization of chlorides, etc., and achieves the effect of reducing volume and toxicity and reducing subsequent treatment costs.

Inactive Publication Date: 2012-01-04
TIANJIN URBAN CONSTR COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fly ash melting can decompose dioxins and stabilize heavy metals in the grid. Glass slag can also be used as glass ceramic building materials, but the melting technology consumes a lot of energy and equipment is expensive, which is not suitable for the small amount of medical waste incineration.
Moreover, during the melting process, chlorides are easy to volatilize at high temperature and cannot be fixed in the glassy product, causing secondary pollution.

Method used

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  • Flyash treatment method for waste incineration
  • Flyash treatment method for waste incineration
  • Flyash treatment method for waste incineration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] See Table 1 for the thermal loss rate, heavy metals, dioxins and chlorine contents of a certain medical waste incineration fly ash. Add 200g of medical waste incineration fly ash and 4 liters of deionized water into the slurry mixing tank at the same time, stir the mortar for 5 minutes to make the fly ash thoroughly wet, during this period, add 400ml of hydrochloric acid to the mortar as an acid extractant, and add 0.2g Diesel oil and 0.05 g of oleic acid were stirred for several minutes to blend the slurry. During this time, 0.05 g of terpineol oil was added to the mortar and stirred for several minutes to blend the slurry.

[0022] Table 1. Medical waste incineration fly ash heat loss rate, heavy metal, dioxin and chlorine content in Example 1

[0023]

[0024] The above-mentioned slurry is sent from the upper part of the flotation column 3 through the slurry inlet pump 2, and the air provided by the air compressor 7 enters from the lower part of the flotation colu...

Embodiment 2

[0035]The medical waste incineration fly ash sample that adopts is identical with embodiment 1, and the amount of hydrochloric acid added in the mortar is 800ml, and the medicament (collector, activator and foaming agent) that adds and other parameters are all the same as embodiment 1.

[0036] The above-mentioned flotation separation products (fine ash, tail ash, precipitated salt) were analyzed after dehydration and drying. The results are shown in Table 5. The dioxin content in the tail ash meets the dioxin limit required by GB16889-2008 (<3ng TEQ / g). At the same time, the dried tail ash was tested for heavy metal leaching concentration according to HJ / T300. The test results are shown in Table 6. The harmful concentration in the leach solution is lower than the concentration limit of heavy metal pollutants in GB16889-2008, indicating that the tail ash can be directly entered into domestic waste. Landfill landfill.

[0037] The thermal ignition loss rate, heavy metal, diox...

Embodiment 3

[0045] The medical waste incineration fly ash sample that adopts is identical with embodiment 1, and the hydrochloric acid amount that adds in mortar is 600ml, and the medicament (collector, activator and foaming agent) that adds and other parameters are all with embodiment 1.

[0046] According to the above conditions, the flotation separation products (fine ash, tail ash, precipitated salt) were analyzed after dehydration and drying. <3ng TEQ / g). At the same time, the dried tail ash was tested for heavy metal leaching concentration according to HJ / T300. The test results are shown in Table 9. The harmful concentration in the leach solution is lower than the concentration limit of heavy metal pollutants in GB16889-2008, indicating that the tail ash can be directly entered into domestic waste. Landfill landfill.

[0047] The thermal ignition loss rate, heavy metal, dioxin and chlorine content and heavy metal recovery rate of the flotation separation product in Table 8 Example ...

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Abstract

The invention discloses a medical treatment flyash treatment method for waste incineration, comprising the following steps: (1) mixing a medical treatment flyash produced in waste incineration with water to prepare into mortar, and adding acid extractant, collecting agent and foaming agent in the mortar to blend into grout; (2) performing foam flotation treament on the grout, and separating to obtain refined flyash and residual grout; (3) feeding the fined flyash in a secondary combustion chamber of a waste incinerator for supporting combustion, wherein carbon components enriched in the refined flyash are utilized in a combusted manner and dioxin in the refined flyash is decomposed at high temperature; (4) filtering the residual grout, separating to obtain tail flyash and filtrate, feeding the tail flyash in a domestic garbage landfill site for dumping; and (5) adding heavy metal precipitator in the filtrate, filtering once again, separating to obtain heavy metal precipitator salt and waste liquor, and discharging the waste liquor after sewage treament. The invention can effectively separate and recovery carbon components in high carbon and high chlorine medical treatment waste incineration flyash, chloridion, dioxin and heavy metal atthe same time.

Description

technical field [0001] The invention relates to a method for treating environmental pollution, in particular to a method for treating fly ash from incineration of medical waste. Background technique [0002] Medical waste is the number one hazardous waste. Especially in recent years, the emergence of severe infectious diseases such as SARS, bird flu, and influenza A that has swept the world has made the harmless treatment of medical waste a focus of attention. Incineration is the main method of disposal of these medical wastes, and the annual disposal capacity of the existing domestic medical waste incineration facilities has exceeded 580,000 tons. After incineration of medical waste, about 3% to 5% of fly ash will be produced. These incineration fly ash contains a considerable amount of heavy metals, dioxins (PCDD / Fs) and other toxic substances and chlorides, etc., which have been listed in my country. "National Hazardous Waste List". According to the national standard GB1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 刘汉桥魏国侠
Owner TIANJIN URBAN CONSTR COLLEGE
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