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Additive for high-temperature melting gasification of waste incineration fly ash and treatment method

A technology of waste incineration fly ash, high temperature melting, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc. Prospects, the effect of avoiding harmful substances, reducing the requirements of heating equipment

Inactive Publication Date: 2020-08-28
浙江华环环境有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the technical problems of low efficiency, high energy consumption, and high cost of flue gas treatment in the high-temperature melting process of waste incineration fly ash in the prior art, the present invention provides an additive and a treatment method for high-temperature melting and gasification of waste incineration fly ash , can treat waste incineration fly ash economically, environmentally friendly and efficiently, and is convenient for popularization and application

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  • Additive for high-temperature melting gasification of waste incineration fly ash and treatment method

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Effect test

Embodiment 1

[0027] A kind of additive of waste incineration fly ash high-temperature melting gasification of the present embodiment, described additive comprises nitrate, carbonate and boric acid, and the addition amount of described additive is every 100kg garbage fly ash to add nitrate 3~5kg, carbon salt 5-10kg, borax 5-10kg.

[0028] Borax can significantly reduce the melting point of incineration fly ash, reduce the melting temperature, improve the fluidity of the molten system, and help heavy metals migrate to the glass body; carbonate is a good flux, which can provide free oxygen, thereby reducing glass viscosity. Make the glass easy to melt; nitrate is used as a clarifying agent to eliminate the visible bubbles generated during the melting process and make the entire melting system more dense. Optionally, the nitrate is sodium nitrate, and the carbonate is one or both of sodium carbonate, calcium carbonate and barium carbonate, which helps to reduce production costs and improve the...

Embodiment 2

[0030] A treatment method for high-temperature melting and gasification of waste incineration fly ash, comprising:

[0031] Step 1: adding solid fuel, flux, and the additive described in claim 1 into the fly ash to be treated, stirring evenly and then pressing to form a fly ash agglomerate, and drying the fly ash agglomerate;

[0032] Step 2: Gasify the fly ash agglomerate at high temperature by heating equipment to generate slag and flue gas, recycle and process the slag, and purify the flue gas.

[0033] The solid fuel can provide heat energy for the fly ash agglomerate in the high-temperature gasification process; the flux is used to reduce the softening, melting or liquefaction temperature of the fly ash, and reduce the temperature requirement and heat consumption of the heating equipment, Optionally, the flux is waste glass or glass powder, clay (can be one or more of kaolin, bentonite and attapulgite), feldspar powder and other mineral raw materials of aluminosilicates (...

Embodiment 3

[0035] Such as figure 1 As shown, a treatment method for high-temperature melting and gasification of waste incineration fly ash in this embodiment can be improved as follows on the basis of any technical solution in Embodiments 1 and 2. The amount of flux added is 100 kg Add 8-13kg of flux to waste incineration fly ash.

[0036] The flux can reduce the crystallization tendency of the vitreous slag generated after the high-temperature melting of inorganic substances in the fly ash, improve the chemical stability, thermal stability, mechanical strength and hardness of the vitreous slag, and weaken the brittleness and hardness of the slag. The leaching toxicity of heavy metals; the slag can be used for roadbed materials, thermal insulation cotton and foam glass, etc., and has good economic benefits and environmental protection functions.

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Abstract

The invention discloses an additive for high-temperature melting gasification of waste incineration fly ash and a treatment method and relates to the field of hazardous waste treatment and disposal. The additive for high-temperature melting gasification of waste incineration fly ash comprises nitrate, carbonate and boric acid; and the addition amount of the additive is 3-5 kg of nitrate, 5-10 kg of carbonate and 5-10 kg of boric acid added to every 100kg of waste fly ash. The high-temperature melting gasification treatment method for the waste incineration fly ash comprises the following stepsof step one of adding solid fuel, a fluxing agent and the additive into the to-be-treated fly ash, performing uniform stirring, and then performing pressing and forming; and step two of performing high-temperature gasification on the fly ash block mass through heating equipment to generate slag and smoke, and purifying the smoke. The technical problems of low efficiency, high energy consumption and high smoke treatment cost in the high-temperature melting treatment process of the waste incineration fly ash in the prior art can be solved, the waste incineration fly ash can be treated economically, environmentally and efficiently, and the popularization and the application are facilitated.

Description

technical field [0001] The invention relates to the field of hazardous waste treatment and disposal, in particular to an additive for high-temperature melting and gasification of waste incineration fly ash and a treatment method. Background technique [0002] Domestic waste, medical waste and other hazardous waste will produce a large amount of fly ash during the incineration process. Fly ash is a hazardous solid waste containing a large amount of heavy metal inorganic harmful substances such as cadmium, chromium, copper, nickel, lead and zinc, as well as organic carcinogens such as furans and dioxins. At the same time, fly ash also contains a large amount of alkali metal oxides, hydroxides, chlorides and sulfides. Fly ash particles are extremely small and light, and can easily escape and float in the atmosphere, causing serious environmental pollution. It is a hazardous waste designated by the state. At present, the methods of dealing with fly ash include safe landfill me...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCB09B2101/30B09B3/20B09B3/40
Inventor 龙朝锋郑郧
Owner 浙江华环环境有限公司
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