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Synchronous harmless recycling method for waste lead plaster and waste incineration fly ash

A waste incineration fly ash and waste lead paste technology, applied in the direction of combustion method, incinerator, combustion type, etc., can solve the problems of difficult resource utilization, large amount of waste lead paste and waste incineration fly ash, high content of toxic components, etc. problem, to achieve the effect of strong operability, easy large-scale promotion, and short processing process

Pending Publication Date: 2022-05-13
CENT SOUTH UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the problems in the prior art that waste lead plaster and waste incineration fly ash are produced in a large amount, the content of toxic components is high, and resource utilization is difficult, the purpose of the present invention is to provide a synchronous and harmless waste lead paste and waste incineration fly ash The method of resource utilization, this method makes full use of the composition characteristics of waste lead paste rich in lead compounds and waste incineration fly ash rich in chlorine, and the waste lead paste and waste incineration fly ash are roasted at high temperature to convert lead into PbO, PbCl 2 and other lead-containing components are recovered from flue gas and particulate matter, while the main component of solid residue is CaSO 4 , can be used as building materials, and at the same time, the degradation of dioxin-like pollutants in waste incineration fly ash can be achieved during the high-temperature roasting process, and the simultaneous harmless and full-component resource utilization of waste lead paste and waste incineration fly ash can be realized. Recycling and ecological environment protection are of great significance

Method used

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  • Synchronous harmless recycling method for waste lead plaster and waste incineration fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Mix waste lead plaster with waste incineration fly ash, anthracite, and bentonite according to: (n(Cl) / 2n(Pb))=0.95, anthracite addition 8%, and bentonite addition 3%, mix evenly, and prepare by mechanical pressing Agglomerates with a particle size of 10-12mm were dried at 150°C for 60 minutes, and the dried pellets were roasted at 1050°C for 45 minutes. The removal rate of Pb in the mixture was 91.27%, and the concentration of dioxin in the flue gas was lower than the national standard GB18484-2001, less than 0.5ng TEQ / Nm 3 .

Embodiment 2

[0036] Mix waste lead plaster with waste incineration fly ash, coke, and starch according to: (n(Cl) / 2n(Pb))=0.8, coke addition amount 7%, starch addition amount 2%, mix evenly, and use a disc pelletizing mechanism Prepare pellets with a particle size of 10-12mm, and dry them at 75°C for 120 minutes. The dried pellets are roasted at 900°C for 60 minutes. The removal rate of Pb in the mixture is 84.21%, and the concentration of dioxins in the flue gas is lower than National standard GB18484-2001, less than 0.5ng TEQ / Nm 3 .

Embodiment 3

[0038] The waste lead plaster is mixed with waste incineration fly ash, coke, and mineral powder binder according to: (n(Cl) / 2n(Pb))=0.9, coke dosage 10%, and mineral powder binder dosage 0% Evenly, use a cylinder pelletizer to prepare agglomerates with a particle size of 10-12mm, and dry them at 125°C for 110 minutes. The dried pellets are roasted at 1250°C for 10 minutes. The removal rate of Pb in the mixture is 91.81%. The concentration of dioxins in the flue gas is lower than the national standard GB18484-2001, less than 0.5ng TEQ / Nm 3 .

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Abstract

The invention discloses a method for synchronously and harmlessly recycling waste lead plaster and waste incineration fly ash. The method comprises the following steps: mixing raw materials containing the waste lead plaster, the waste incineration fly ash and the solid fuel for pelletizing, sequentially drying and roasting the obtained block mass, recovering a lead-containing component from roasting flue gas and particulate matters, and remaining solid residues which are mainly composed of CaSO4. The degradation of dioxin pollutants in the waste incineration fly ash is realized, and meanwhile, the resource utilization of all components of the waste lead plaster and the waste incineration fly ash is realized.

Description

technical field [0001] The present invention relates to a method for synchronous harmless recycling of waste lead plaster and waste incineration fly ash, in particular to a method for recovering lead-containing components through high-temperature roasting by using waste lead plaster and waste incineration fly ash and simultaneously obtaining calcium sulfate products The method belongs to the technical field of coordinated harmless and resource comprehensive utilization of hazardous waste. Background technique [0002] Lead-acid batteries are widely used in transportation, communication, electric power and other fields due to their low cost, stable voltage, and large capacity. With the increasing market demand for lead-acid batteries and the continuous shortage of lead ore resources, the recovery of lead resources from waste lead paste is of great significance to ensure the supply of lead. In addition, the efficient recycling of waste lead paste can help reduce its serious t...

Claims

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Application Information

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IPC IPC(8): F23G7/00F23G5/44F23J15/02F23J15/04
CPCF23G7/00F23G5/444F23G5/44F23J15/022F23J15/04
Inventor 孙增青范晓慧甘敏陈许玲季志云黄晓贤袁礼顺唐庆余邢金鑫
Owner CENT SOUTH UNIV