Municipal solid waste incineration fly ash resource utilization method

A technology for municipal solid waste and fly ash incineration, applied in solid separation, flotation, etc., can solve the problems of high cost of high temperature treatment and inability to recycle into resources, and achieve the effects of low cost, simple operation and simple process

Active Publication Date: 2013-06-05
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems in the above-mentioned prior art that high-temperature treatment costs are high, solidification/stabilization and extraction technologies cannot well realize the simultaneous removal of heavy metals and dioxin pollutio

Method used

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  • Municipal solid waste incineration fly ash resource utilization method
  • Municipal solid waste incineration fly ash resource utilization method

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Embodiment Construction

[0019] The municipal solid waste incineration fly ash process will be further described in conjunction with the examples below.

[0020] A waste incineration power plant in Xiamen has two 300t / d waste incinerators. Each incinerator in this system is equipped with a set of flue gas purification treatment devices, which are reaction tower acid removal, activated carbon jet adsorption, and pulse bag dust removal. The flue gas produced after garbage incineration is cooled by the waste heat boiler, and the flue gas enters the reaction tower to react with the lime slurry. The lime slurry required for the reaction is sprayed into the Venturi mixing tower after being pressurized by the pump, and the purified flue gas enters the bag dust removal The unreacted fine particles are returned to the reaction tower for recycling through the return device, while the coarse solid particles in the flue gas are separated, caught by cloth bags and sent to the ash tank.

[0021] (1) Weigh 400g of d...

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Abstract

The invention provides a municipal solid waste incineration fly ash resource utilization method and relates to municipal solid waste treatment. The method includes a first step of mixing fly ash and water in a floatation tank, adding in sodium sulphide and stirring the mixture so as to enable salt in the fly ash to be dissolved into the water, and enabling heavy metal such as plumbum (Pb) and zinc (Zn) in an oxidation state in the fly ash to achieve vulcanizing to generate plumbum sulfide (PbS) and zinc sulfide (ZnS), a second step of adding collecting agents into the floatation tank again and stirring so as to enable the collecting agents to fully contact with the fly ash and enable the collecting agents to be adsorbed on the surfaces of vulcanized heavy metal, a third step of adding foaming agents and terpenic oil in the floatation tank, carrying out flotation separation and centrifugal dewatering, adding cement, sand, water, exciting agents, namely sodium delicate, and alum into the obtained fly ash and stirring, filling stirred samples into a trial mould, compacting the stirred samples, placing and maintaining the stirred samples and then demoulding to obtain cement blocks, and a fourth step of carrying out centrifugal dewatering on floating objects in the floatation tank, sending the floating objects into a household garbage incineration plant, and carrying out high-temperature processing on dioxin, wherein the dioxin can be completely resolved under an environment with the temperature larger than 850 DEG C and smoke stay time more than 2 hours (s), and smoke reaches the standard and is exhausted.

Description

technical field [0001] The invention relates to municipal solid waste treatment, in particular to a resource utilization method of municipal solid waste incineration fly ash. Background technique [0002] The fly ash produced after municipal solid waste incineration treatment is hazardous waste because it contains heavy metals such as Zn, Pb, Cu, Cr and highly toxic organic pollutants such as dioxin. harm treatment. With the development of waste incineration treatment technology, secondary pollutants have been well controlled, especially the dioxin content in fly ash has been lower than the soil standard value of 1ng / g in Japan, the United States and other countries. With the formulation of corresponding national standards , the conditions for fly ash resource treatment are gradually met. There will be a large amount of incineration fly ash for a long period of time in the future. Therefore, as a potential resource that exists in large quantities, the resource utilization ...

Claims

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Application Information

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IPC IPC(8): B03D1/00
Inventor 杨玉荣赵付一黄世清张厚坚曾斌龙
Owner XIAMEN UNIV
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