Household garbage incineration flying dust electrode melting treatment and resourceful utilization method

A technology for waste incineration fly ash and recycling, applied in chemical instruments and methods, gas treatment, separation methods, etc., can solve the problems of high energy consumption, unfavorable promotion, and high treatment costs, achieve high investment, avoid acid gas corrosion, difficult effect

Active Publication Date: 2017-08-25
TIANJIN YIMING ENVIRONMENTAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the defects of high processing cost, high energy consumption, and unfavorable promotion in the fly ash melting technology, the present invention proposes a method for melting the fly ash electrode of domestic waste incineration and utilizing it as a resource. The method and system ad

Method used

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  • Household garbage incineration flying dust electrode melting treatment and resourceful utilization method

Examples

Experimental program
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Example Embodiment

[0024] Example 1

[0025] The fly ash and auxiliary materials are weighed so that the added amount of fly ash is 90% of the total mass of the mixture. The auxiliary material is quartz sand. The semi-automatic control system is used to transport the mixture to the mixer, and the mixture is sent to the molybdenum electrode after mixing. Melting furnace.

[0026] A 40cm thick layer of mixed material is laid on the molybdenum electrode melting furnace. When the melting temperature in the furnace is controlled at 1500℃, the material is discharged after staying for 10 minutes. The heavy molten liquid sinks to the bottom of the melting furnace and passes through the flow hole with electric heating. The space of the ascending channel and the material channel are discharged to the water quenching tank, and the vitrified product is formed by quenching treatment; when the light molten liquid floats through the mixed material layer, it is initially adsorbed and purified. After the preliminary ...

Example Embodiment

[0034] Example 2

[0035] The fly ash and auxiliary materials are weighed so that the added amount of fly ash is 75% of the total mass of the mixture. The auxiliary material is cullet. The semi-automatic control system is used to transport the mixture to the mixer, and the mixture is sent to the graphite electrode after stirring. Melting furnace.

[0036] Lay a 20cm thick mixed material layer above the graphite electrode melting furnace and add a water-cooled pipe on the top of the furnace to match the water cooling method. When the melting temperature in the furnace is controlled at 1250°C, the material is discharged after 50 minutes of residence, and the heavy molten liquid sinks to the bottom of the melting furnace. It is discharged to the water quenching tank through the liquid flow hole, ascending passage and material passage space with electric heating, and is quenched to form a vitrified product; when the light molten liquid floats through the mixed material layer, it is ini...

Example Embodiment

[0044] Example 3

[0045] Fly ash and auxiliary materials are weighed so that the added amount of fly ash is 50% of the total mass of the mixture. The auxiliary materials are a mixture of cullet and slag. The mixture is conveyed to the mixer by a fully automatic control system, and the mixture is mixed evenly. Send to the tin oxide electrode melting furnace.

[0046] Lay a 6cm thick mixed material layer above the molybdenum electrode melting furnace. When the melting temperature in the furnace is controlled at 900°C, the material is discharged after 80 minutes of staying. The heavy molten liquid sinks to the bottom of the melting furnace and passes through the flow hole with electric heating. The space of the ascending channel and the material channel are discharged to the water quenching tank, and the vitrified product is formed by quenching treatment; when the light molten liquid floats through the mixed material layer, it is initially adsorbed and purified. After the preliminary...

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PUM

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Abstract

The invention relates to a household garbage incineration dust electrode melting treatment and resourceful utilization method. The method comprises the steps of sending flying dust and auxiliaries after the flying dust and auxiliaries evenly stirred into an electrode melting furnace, under the conditions of 800-1,500 DEG C, conducting standing for 10-100 min, making heavy melted liquid precipitate to the bottom of the melting furnace, and conducting water quenching to form a vitrification product; making high boiling point substances in light melted liquid condensed at the top of a cold furnace or a mixed material layer, and conducting burying after draining condensed liquid; delivering low boiling point substances in the light melted liquid to a tail gas purifying system. During continuous work, a mode of a pressure furnace is adopted to make the system run at a low temperature, and energy conservation and consumption reducing are effectively achieved; unreacted Ca(OH)2 contained in the mixed material layer adopted by a cold heading mode can be used as an acid removal agent to adsorb pollutants like acidic gas and heavy metal in flue gas, and therefore the flue gas is preliminarily purified; meanwhile, the lowest temperature at the top of the material layer can reach 200 DEG C or above, volatilization of low boiling point substances is drastically reduced, and the flue gas treatment system is effectively prevented from being corroded or hardened by acidic gas.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and disposal, and in particular relates to an electrode melting treatment and resource utilization method of domestic waste incineration fly ash. Background technique [0002] Domestic waste incineration fly ash is a kind of off-white or dark gray fine powder, with low moisture content, generally rod-shaped, polygonal, cotton-like, spherical and other irregular shapes, uneven particle size, high porosity and large specific surface area specialty. Fly ash is rich in high concentration of chlorine salts, high content of heavy metals and dioxins that are easily leached, and is listed as hazardous waste by countries all over the world (China, code HW18). In recent years, a variety of fly ash disposal technologies have been researched at home and abroad, including solidification and stabilization landfill, separation and extraction, heat treatment such as sintering and melting, and other...

Claims

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Application Information

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IPC IPC(8): C03C6/00C03C6/04C03C6/02C03C6/10C03B5/235B01D46/02B01D53/00B01D53/02B01D53/18
CPCB01D46/023B01D53/002B01D53/02B01D53/18B01D2253/102B01D2258/02C03B5/235C03C1/002Y02P40/50
Inventor 张曙光陈启王娟娟王建伟赵恩健刘连胜
Owner TIANJIN YIMING ENVIRONMENTAL TECH CO LTD
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