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Method for treating household waste incineration fly ash in cooperated way by lead smelting and application

A technology of domestic waste incineration and waste incineration fly ash, which is applied in the direction of improving process efficiency, can solve the problems of limited utilization of resources, environmental pollution, and non-degradable heavy metals, so as to reduce treatment costs and production costs , the effect of reducing environmental pollution

Inactive Publication Date: 2018-09-04
GUANGDONG POLYTECHNIC OF ENVIRONMENTAL PROTECTION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Landfill technology cannot utilize waste incineration fly ash as a resource, and also requires complex pre-solidification treatment, otherwise it will cause a certain degree of environmental pollution
First, the dioxins in the fly ash cannot decompose by themselves at temperatures below 800°C; second, the fly ash contains a large amount of heavy metals (Zn, Pb, Cu, etc.) that are not degradable
However, as a doping auxiliary material for building materials, it cannot degrade dioxins, and can only play a certain dilution effect on dioxins and heavy metal elements, and the degree of resource utilization is also limited.

Method used

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  • Method for treating household waste incineration fly ash in cooperated way by lead smelting and application
  • Method for treating household waste incineration fly ash in cooperated way by lead smelting and application

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Embodiment 1

[0027] This embodiment provides a method for co-processing domestic waste incineration fly ash by lead smelting, which mainly includes the following steps:

[0028] Composition of a domestic waste incineration plant: CaO 32.74%, Al 2 o 3 1.55%, SiO 2 8.79%, K 2 O4.67%, Na 2 O 4.84%, Cl 14.12%. The above garbage incineration fly ash was taken, washed with water at 20°C for 1.5 hours, and dried at 60°C for 2 hours. Composition of fly ash after water washing: CaO 45.91%, Al 2 o 3 3.26%, SiO 2 14.15%, K 2 O 0.29%, Na 2 O 0.41%, Cl 0.46%.

[0029] The sintering roasting-blast furnace reduction lead smelting process is adopted, the lead concentrate and the washed fly ash are mixed at a mass ratio of 1:100, and after adding an appropriate flux for sintering and oxidation, the blast furnace reduction smelting is carried out at 1200 ° C to avoid dioxins Decomposed completely. The crude lead composition obtained is: Pb 94.0%, Cu 1.1%.

Embodiment 2

[0031] This embodiment provides a method for co-processing domestic waste incineration fly ash by lead smelting, which mainly includes the following steps:

[0032] Composition of a domestic waste incineration plant: CaO 32.74%, Al 2 o 3 1.55%, SiO 2 8.79%, K 2 O4.67%, Na 2 O 4.84%, Cl 14.12%. The above garbage incineration fly ash was taken, washed with water at 30°C for 0.5 hour, and dried at 80°C for 1 hour. Composition of fly ash after water washing: CaO 41.95%, Al 2 o 3 2.43%, SiO 2 14.24%, K 2 O 0.25%, Na 2 O 0.40%, Cl 0.42%.

[0033] Using sintering roasting-blast furnace reduction lead smelting process, mix lead concentrate and washed fly ash at a mass ratio of 1:25, add appropriate flux and then granulate, after sintering and oxidation, carry out blast furnace reduction at 1300°C Smelting, dioxins are completely decomposed. The crude lead composition obtained is: Pb 94.5%, Cu 1.2%.

Embodiment 3

[0035]This embodiment provides a method for co-processing domestic waste incineration fly ash by lead smelting, which mainly includes the following steps:

[0036] Composition of a domestic waste incineration plant: CaO 32.74%, Al 2 o 3 1.55%, SiO 2 8.79%, K 2 O4.67%, Na 2 O 4.84%, Cl 14.12%. The above garbage incineration fly ash was taken, washed with water at 25° C. for 1 hour, and dried at 60° C. for 1.5 hours. Composition of fly ash after water washing: CaO 43.52%, Al 2 o 3 3.08%, SiO 2 14.13%, K 2 O 0.28%, Na 2 O 0.39%, Cl 0.40%.

[0037] Using the direct smelting lead smelting process, the lead concentrate and washed fly ash are mixed at a mass ratio of 1:20, and directly smelted under the condition of 1300°C, and the dioxins are completely decomposed. The crude lead composition obtained is: Pb 48.4%.

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Abstract

The invention provides a method for treating household waste incineration fly ash in a cooperated way by lead smelting and application, and relates to the technical field of resource recovery. The method for treating household waste incineration fly ash in the cooperated way by lead smelting comprises the following steps of melting the household waste incineration fly ash which is washed by waterand dried with lead concentrates, wherein the household waste incineration fly ash is prepared from the major ingredients of CaO, SiO2 and Al2O3; meanwhile, dioxin and heavy metal elements are contained. The method has the advantages that the operation is simple; the harmless treatment and resource utilization of the waste incineration fly ash is realized; the lead smelting cost is reduced; the environment pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of resource recovery, and in particular to a method and application of lead smelting to co-process domestic waste incineration fly ash. Background technique [0002] With the improvement of the living standards of Chinese urban residents and the degree of urban modernization, China's domestic waste disposal is in a transition period from landfill-based to incineration-based. At the end of 2015, the total amount of domestic waste incineration and treatment in the country reached 65.77 million tons, accounting for 34% of the total amount of harmless treatment. According to related reports, by 2020, domestic waste incineration capacity will account for 50% of the harmless treatment capacity, and the average daily disposal capacity of domestic waste will reach 59.1 tons, which will generate 6.5-11 million tons of waste incineration fly ash per year. [0003] Because a large amount of dioxins and heavy metals wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B13/02C22B5/02
CPCC22B5/02C22B13/02Y02P10/20
Inventor 王文祥王晓阳方红生莫越坚
Owner GUANGDONG POLYTECHNIC OF ENVIRONMENTAL PROTECTION ENG
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