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Method for treating flying ash through low-temperature molten sintering

A fly ash and low-temperature technology, applied in the field of low-temperature melting and sintering disposal of fly ash, can solve the problems of high consumption of fuel and electricity, lowering glass transition temperature and vitrification effect, volatilization of heavy metal components in fly ash, etc. The effect of reducing volatilization

Inactive Publication Date: 2013-08-07
广东生活环境无害化处理中心有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the existing process of melting and sintering fly ash, there are problems: (1) higher temperature makes the melting of fly ash easier, but high temperature also easily causes the volatilization of heavy metal components in fly ash; in order to reduce the melting temperature and To promote the formation of stable glassy substances, in addition to the fly ash itself, it is usually possible to add some flux to reduce the glass transition temperature and glass transition effect
(3) The melting process also consumes a lot of fuel and electricity
The above problems have inhibited the popularization and use of the method of melting and sintering to dispose of fly ash.

Method used

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  • Method for treating flying ash through low-temperature molten sintering

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Embodiment 1

[0027] In the method for disposing of fly ash by low-temperature melting and sintering of the present invention, the flux is composed of glass, borax and calcium fluoride, and the glass material is waste glass. The mass ratio of glass, borax and calcium fluoride is 100:2:10:3, and the obtained mixed components are added with water according to the mass ratio of fly ash and water at 100:32 and prefabricated into spherical blocks with a length of 80-100mm , and then put the block material into the industrial waste incinerator, the furnace type is a rotary kiln, and use the combustion heat in the furnace to carry out low-temperature melting and sintering of the fly ash in the block material. The combustion chamber where the block material in the industrial waste incinerator is located The incineration temperature is 950-1000°C, and the incineration time is 50 minutes.

Embodiment 2

[0029] In the low-temperature melting and sintering method for disposing of fly ash of the present invention, the flux is composed of glass, borax and calcium fluoride, the glass material is glass slag from a medical waste incinerator, and the components of the flux are first crushed to 100-150 meshes, Then, the mass ratio of fly ash, glass, borax and calcium fluoride is 100:10:25:20, and the obtained mixed component is added with water according to the mass ratio of fly ash and water at 100:28 and prefabricated into 12×8mm. The strip-shaped bulk material with a length of 80mm is put into the centralized medical waste incineration system. The incinerator is an inclined reciprocating grate incinerator. The ash is melted and sintered at a low temperature. The incineration temperature of the combustion chamber where the block material is located in the medical waste incinerator is 900-1000° C., and the incineration time is 10 minutes.

Embodiment 3

[0031] In the method for disposing of fly ash by low-temperature melting and sintering of the present invention, the flux is composed of glass, borax and calcium fluoride, and the glass material is waste glass. The mass ratio of glass, borax and calcium fluoride is 100:20:15:3, and the obtained mixed component is added with water according to the mass of fly ash and water at 100:30 and prefabricated into a square with a size of 50×50×30mm block material, and then put the block material into the inclined reciprocating grate incinerator of domestic waste, and use the combustion heat in the furnace to melt and sinter the fly ash in the block material at low temperature, where the block material in the domestic waste incinerator is The incineration temperature of the combustion chamber is 850-900°C, and the incineration time is 40 minutes.

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Abstract

The invention discloses a method for treating flying ash through low-temperature molten sintering and belongs to the technical field of hazardous solid waste treatment. The process is finished through the following steps of: mixing the flying ash and a fluxing agent subjected to crushing treatment, adding water into the mixed components, prefabricating into blocks, throwing the blocks into a solid waste incinerator, and performing low-temperature molten sintering on the blocks containing the flying ash by utilizing combustion heat in the furnace in a process of combusting the solid wastes. According to the method for treating flying ash through low-temperature molten sintering, the melting temperature of the flying ash can be effectively reduced, the physical form of the flying ash can be changed, and the flying ash can be subjected to molten sintering treatment by fully utilizing conventional solid waste incineration equipment, so that the equipment investment cost is saved; the flying ash is treated by utilizing the combustion heat in the process of combusting the solid wastes, so that the energy consumption can be reduced; and moreover, the flying ash subjected to molten sintering is good in curing agent, and heavy metal ions in the flying ash can be effectively prevented from leaching out.

Description

technical field [0001] The invention relates to a low-temperature melting and sintering method for disposing fly ash, which belongs to the technical field of hazardous solid waste treatment. Background technique [0002] Fly ash refers to the dust collected by solid waste (domestic waste, industrial waste, medical waste) in the flue, heat recovery system and purification system of the incineration system. Fly ash is a hazardous waste listed in the National Hazardous Waste List. At present, the main methods for disposal of incineration fly ash at home and abroad include solidification, chemical stabilization, melting / vitrification, and acid or other solvent elution. The melting / vitrification treatment of fly ash is to use the combustion heat of fuel or electric heating to thermally decompose, burn or gasify the organic matter in the fly ash at high temperature, while the inorganic matter is melted into glassy slag, fly ash Some of the heavy metal salts in the slag are gasifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 江远清陈锵陈岳祥杨枝安
Owner 广东生活环境无害化处理中心有限公司
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