Method for treating hazardous waste incineration bottom ash by using plasma technology

A hazardous waste and technical treatment technology, applied in the field of ion technology to treat hazardous waste incineration slag, can solve the problems of inability to directly comprehensively utilize, high construction cost, strong regional monopoly, etc., to meet ultra-low leaching toxicity, meet technical requirements, The effect of broad promotion space

Inactive Publication Date: 2016-08-03
SHANGHAI SOLID WASTE DISPOSAL CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, because the temperature of the rotary kiln is relatively low and it is in an aerobic atmosphere, harmful substances such as dioxins will be produced during the incineration process, and a large amount of them will remain in the slag
[0005] The incineration of medical waste by the above-mentioned rotary kiln will produce a large amount of slag, which has a relatively low density and a relatively large volume. It also contains dioxins and heavy metals, which has a huge impact on the health of surrounding residents and cannot be directly For comprehensive utilization, these slags need to be sent to hazardous waste landfills for landfill treatment
However, hazardous waste landfills have the problems of high construction costs, strong regional monopoly, complicated landfill procedures, high construction and maintenance costs, and will occupy a large amount of land resources, and need more than 20 years of maintenance before they can be closed. It is difficult to implement for a long time, and it also causes a waste of resources
Moreover, even after the site is closed, the bottom film may rupture during the long-term landfill process, causing hazardous substances in the slag to penetrate into the soil, which will seriously affect the safety of groundwater

Method used

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  • Method for treating hazardous waste incineration bottom ash by using plasma technology

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Experimental program
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Effect test

Embodiment 1

[0049] Get medical waste incineration slag as raw material slag A, with 400 kg / h of raw material slag weight (which contains 100 kg of fly ash after washing treatment), put into continuous plasma furnace for plasma heating treatment. During the treatment process, add 40 kg of sodium-calcium ordinary glass frit, 5 kg of alumina, and 8 kg of calcium carbonate. The plasma heating treatment temperature is 1300 ° C. After 10 minutes of treatment, the material is continuously discharged, cooled with flowing water, and the water temperature is 20 degrees. . The produced vitrified slag was sampled and passed the waste toxicity leaching test.

Embodiment 2

[0051] Take medical waste incineration slag as raw material slag B, add 700 kg / h raw material slag weight (which contains 200 kg of washed fly ash) into continuous plasma furnace for plasma heating treatment. During the treatment process, add 140 kg of sodium-calcium ordinary glass frit, 10 kg of alumina, and 35 kg of calcium carbonate. Considering that the vitreous (glassy substance) is mixed with stainless steel substances (stainless steel substances include metal tweezers and other appliances in medical waste) , mixed into the glass body through the slag), the plasma heating treatment temperature is 1600 ° C, the treatment time is 19 minutes, and the material is continuously discharged, cooled with flowing water, and the water temperature is 20 ° C. Since the stainless steel substances mixed in the glass body are pure metal substances, they are separated from the vitrified slag after water cooling and can be sorted out later. The produced vitrified slag was sampled and pass...

Embodiment 3

[0053] Get medical waste incineration slag as raw material slag C, put into continuous plasma furnace and carry out plasma heat treatment with 500 kg / h raw material slag weight (which contains 100 kg of fly ash after washing treatment). During the treatment process, 7 kg of alumina was added, 15 kg of calcium carbonate was added, the plasma heating temperature was 1200°C, and the material was discharged continuously after 12 minutes of processing time, and cooled with flowing water at a water temperature of 20°C. The produced vitrified slag was sampled and passed the waste toxicity leaching test.

[0054] In summary, the present invention decomposes and destroys toxic organic substances including dioxins remaining in the slag by using high temperature generated by plasma, and the effectiveness can reach more than 99%, and forms a closed structure through heating and cooling Vitrified slag with high hardness and high strength can solidify the heavy metal ions contained in the s...

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Abstract

The invention discloses a method for treating hazardous waste incineration bottom ash by using plasma technology. According to the invention, high temperature produced by plasma is utilized to decompose and destroy residual toxic organic matters including dioxin in the incineration bottom ash, and heating and cooling are carried out so as to form high-hardness high-strength vitrification slag of enclosed structure. As heavy metal ions included in the incineration bottom ash are immobilized, secondary pollution can be avoided, and technical requirements for ultralow leaching toxicity can be met, so hazardous wastes can be efficiently converted into non-hazardous wastes and do not need landfilling at great expense; and the vitrification slag formed after treatment can be converted into a road building material, constructional material or the like for comprehensive utilization, so the method has wide promotion space.

Description

technical field [0001] The invention relates to the technical field of hazardous waste treatment, in particular to a method for treating hazardous waste incineration slag using plasma technology. Background technique [0002] In recent years, with the rapid development of social economy and modern industry, the generation of various wastes is increasing day by day, especially the disposal of toxic, harmful and dangerous wastes, which has become a social problem that causes headaches for governments of all countries. Hazardous wastes are toxic, explosive, corrosive, chemically reactive, infectious, radioactive and other harmful characteristics, which cause serious pollution to the environment and can last for a long time, thus causing serious damage to the sustainable development of the environment and economy. serious hazard. [0003] Due to various technical and economical reasons for hazardous waste treatment, most of the hazardous wastes in my country are directly landfi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B3/00B09B3/29B09B2101/30B09B3/40
Inventor 唐杰周乃成王德浩朱杰毛丁胡明卢青李铭黄永玖崔昌国陈赟邹伟龙陈正浩杨菲
Owner SHANGHAI SOLID WASTE DISPOSAL CENT
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