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Method for microwave firing of porous ceramsites by adopting medical waste incineration fly ash

A technology for incinerating fly ash and medical waste, applied in the field of environmental pollution control, to solve the temperature gradient, increase the heating rate, and improve the effect of heat preservation

Active Publication Date: 2014-02-26
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional ceramsite sintering kiln needs to rely on coal combustion to maintain the kiln temperature, and will produce a large amount of flue gas containing volatile heavy metals, and complex exhaust gas purification facilities need to be equipped after the kiln

Method used

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  • Method for microwave firing of porous ceramsites by adopting medical waste incineration fly ash
  • Method for microwave firing of porous ceramsites by adopting medical waste incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The chemical composition of a certain medical waste incineration is shown in Table 1, and the thermal ignition reduction rate, heavy metal, dioxin and chlorine content of fly ash are shown in Table 2. Put the medical waste incineration fly ash and quartz sand into the mixer at a mass ratio of 5:1 and mix them thoroughly, then add deionized water (total moisture content is controlled at 5%) and stir evenly, and then send the mixture into the flat die molding machine Extruded into strip-shaped particles with a diameter of 0.8mm, put the strip-shaped particles in a drying oven to dry for 24 hours to remove the moisture in them, and after drying, the granule raw materials are placed in an industrial microwave sintering furnace, and silicon carbide powder is used for buried powder sintering and microwave sintering The working frequency of the furnace is 2.45GHz, and the power of the microwave oven is adjusted to 3.6kW. When the microwave sintering temperature reaches 900°C, k...

Embodiment 2

[0026] The medical waste incineration fly ash sample that adopts is identical with embodiment 1, and the mass ratio of medical waste incineration fly ash and waste glass powder is put into the mixer by 2:1 and fully mixed, then deionized water (total water content control 10 %) Stir evenly, send the mixture into a flat die forming machine and extrude into strip-shaped granules with a diameter of 0.8mm, put the strip-shaped granules in a drying oven for 24 hours to remove moisture, and place the dried granule raw materials in an industrial microwave In the sintering furnace, the mixed powder of activated carbon and silicon carbide (the mass ratio of the two is 3:1) is used for buried powder sintering. The operating frequency of the microwave sintering furnace is 2.45GHz, and the power of the microwave oven is adjusted to 7.2kW. When the microwave sintering temperature Reach 1000°C, keep warm for 25 minutes, take out the furnace after sintering and cool to room temperature to obt...

Embodiment 3

[0030] The medical waste incineration fly ash sample that is adopted is the same as in Example 1, and the medical waste incineration fly ash and waste glass powder are put into a mixer and fully mixed in a mass ratio of 1:1, and then deionized water is added (total moisture content control 15%) and stir evenly, send the mixture into a flat die forming machine and extrude into strip-shaped particles with a diameter of 0.8mm, put the strip-shaped particles in a drying oven for 24 hours to remove moisture, and place the dried granular raw materials in the industrial In the microwave sintering furnace, ferric iron tetroxide powder is used for buried powder sintering. The operating frequency of the microwave sintering furnace is 2.45GHz, and the power of the microwave oven is adjusted to 7.2kW. When the microwave sintering temperature reaches 1100°C, keep it warm for 5 minutes. Take it out of the furnace and cool to normal temperature to obtain porous ceramsite. The technical index...

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Abstract

The invention discloses a method for microwave sintering of porous ceramsites by adopting medical waste incineration fly ash. The method comprises the following steps: (1) fully mixing the medical waste incineration fly ash with an auxiliary material, adding a small amount of water into the mixture, and carrying out granulation molding by a molding machine; (2) carrying out granulation molding, drying to obtain a particle raw material, filling the periphery of the particle raw material with a microwave coupling agent powder; and (3) carrying out microwave sintering of the particle raw material filled with the powder, and after sintering, cooling to the room temperature to obtain the porous ceramsites. The method can utilize a 'hot spot' effect of fly ash high-content active carbon in a microwave field to instantly completely decompose dioxins in the fly ash, at the same time, allows most heavy metals to be wrapped and cured in grids of the sintered product, and rapidly sinters the fly ash into the porous ceramsites; and the ceramsites can be used for building aggregates or wastewater filter materials, achieves further resource utilization while achieving harmlessness treatment of the medical waste incineration fly ash, and achieves many things at one stroke.

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 incineration fly ash is the product of medical waste incineration, the main component is SiO 2 , CaO, Al 2 o 3 and Fe 2 o 3 Inorganic substances, such as dioxins and heavy metals, are enriched in a considerable amount of toxic substances such as dioxins and heavy metals in the ash, which are extremely harmful and have been included in my country's "National List of Hazardous Wastes". Compared with domestic waste incineration fly ash, medical waste incineration fly ash contains a considerable amount of activated carbon and unburned residual carbon, both of which lead to a thermal reduction rate of fly ash as high as 30%. Fly ash flotation detoxification method, and it is confirmed that activated carbon in fly ash is the enrichment source of organic poll...

Claims

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Application Information

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IPC IPC(8): C04B38/06
Inventor 刘汉桥魏国侠孙磊张蕊
Owner TIANJIN CHENGJIAN UNIV
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