Municipal solid waste incineration fly ash resource utilization method

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 ...

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 pollution, and cannot be recycled, and provide effective Separation of heavy metals, after pretreatment, the fly ash is mixed with cement, sand, and activator for maintenance, and a resource utilization method of municipal solid waste incineration fly ash is produced to produce unburned bricks

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