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A kind of molten salt heat treatment method of waste incineration fly ash

A technology of waste incineration fly ash and heat treatment method, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problems of high processing temperature, large energy consumption and secondary pollution, etc. The effect of resource synergy and improving resource utilization efficiency

Active Publication Date: 2018-10-16
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a heat treatment method for waste incineration fly ash molten salt, which solves the problems of high processing temperature, high energy consumption and difficulty in avoiding secondary pollution caused by the re-release of toxic trace elements in the existing waste incineration fly ash treatment method, so as to realize fly ash Weight reduction and detoxification of ash, and simultaneous recovery of some heavy metal resources. The residue after treatment can be processed and disposed of as a building material or safely landfilled

Method used

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  • A kind of molten salt heat treatment method of waste incineration fly ash

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) The carbonate group is mixed, and then heated at 900°C to obtain mixed molten salt; the carbonate group is a mixture of 33.3% sodium carbonate, 33.3% potassium carbonate and 33.4% lithium carbonate by mass percentage ;

[0024] (2) Add garbage incineration fly ash to the mixed molten salt, carry out melting and heat treatment, and obtain the reactants through separation to obtain secondary molten salt and residue; the mass ratio of the mixed molten salt to garbage incineration fly ash is 10 : 1; melting heat treatment temperature is 850 ℃, and the time of heat treatment is 2h;

[0025] Test the residue quality and heavy metal content respectively;

[0026] (3) After the residue is treated, it is used as a building material or safely landfilled; for the secondary molten salt, check whether the content of Pb, Zn or Cu reaches 0.7%, 1%, or 0.4%, then proceed to step (4), otherwise it will be used as mixed molten salt and turn to step (2);

[0027] (4) Extraction and...

Embodiment 2

[0030] (1) The chloride salt group is mixed, and then heated at 400° C. to obtain mixed molten salt; the chloride salt group is 33.3% by mass percentage of sodium chloride, 33.3% of potassium chloride and 33.4% of chloride Calcium mixture;

[0031] (2) Add waste incineration fly ash to the mixed molten salt, carry out melting heat treatment, and obtain the reactant after separation to obtain secondary molten salt and residue; the mass ratio of the mixed molten salt to waste incineration fly ash is 3 : 1; Melting heat treatment temperature is 400 ℃, and the time of described heat treatment is 4h;

[0032] (3) After the residue is treated, it is used as a building material or safely landfilled; for the secondary molten salt, check whether the content of Pb, Zn or Cu reaches 0.7%, 1%, or 0.4%, then proceed to step (4), otherwise it will be used as mixed molten salt and turn to step (2);

[0033] (4) Extraction and recovery of heavy metals are carried out on the secondary molten...

Embodiment 3

[0036] (1) Mix the carbonate group and the chloride salt group, and then heat at 600° C. to obtain mixed molten salt; the mass percentage of the carbonate group and the chloride salt group is 60%: 40%;

[0037] The carbonate group is a mixture of 50% by mass of sodium carbonate and 50% of potassium carbonate, and the chloride salt group is a mixture of 50% by mass of sodium chloride and 50% of potassium chloride;

[0038] (2) Add waste incineration fly ash to the mixed molten salt, carry out melting heat treatment, the obtained reactants are separated to obtain secondary molten salt and residue; the mass ratio of the mixed molten salt to waste incineration fly ash is 20 : 1; melting heat treatment temperature is 600 ℃, and the time of described heat treatment is 10h;

[0039] Test the residue quality and heavy metal content respectively;

[0040] (3) After the residue is treated, it is used as a building material or safely landfilled; for the secondary molten salt, check whet...

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Abstract

A molten salt heat treatment method for waste incineration fly ash belongs to the ash slag treatment method, which solves the problems of high processing temperature, high energy consumption and difficulty in avoiding secondary pollution caused by toxic trace elements in the existing waste incineration fly ash treatment method. The invention includes the steps of preparing mixed molten salt, melting heat treatment, inspection of heavy metal content and extraction and recovery of heavy metal. The invention uses the excellent melting, heat storage and reaction characteristics of molten salt to realize the dissolution of chloride, sulfate and some heavy metals in fly ash. The process is relatively simple, the reaction conditions are mild and easy to control, and the heavy metals in fly ash can be effectively controlled. leaching, the processed molten salt can be recycled, and the leached heavy metals can be deeply enriched and recycled. The degree of hazard of the treated residue is greatly reduced, which is convenient for building material utilization and safe landfill, effectively reducing secondary pollution and improving Resource utilization efficiency can simultaneously realize the weight reduction, harmlessness and resource utilization of waste incineration fly ash.

Description

technical field [0001] The invention belongs to an ash treatment method, in particular to a molten salt heat treatment method for waste incineration fly ash, which is suitable for weight reduction, harmlessness and resource utilization of waste incineration fly ash. Background technique [0002] During the process of waste incineration, a large amount of fly ash is produced, which contains toxic and harmful substances such as heavy metals and dioxins. Unreasonable treatment and disposal will introduce potential environmental hazards. Traditional cement solidification and safe landfill technology increase the volume and weight of the processed fly ash, resulting in the need for more land resources for the final disposal of the fly ash, and will also waste a large amount of inorganic mineral resources contained in the fly ash, especially Is Pb, Zn, Cu and other non-ferrous metals. Compared with traditional cement solidification and safe landfill technology, high-temperature h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
CPCB09B2101/30B09B3/40
Inventor 胡红云曹金秀姚洪谢康刘欢许勉申俊豪杨宇涵
Owner HUAZHONG UNIV OF SCI & TECH
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