CN109701998A - A kind of method of disposal of flying ash - Google Patents
A kind of method of disposal of flying ash Download PDFInfo
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- CN109701998A CN109701998A CN201910113038.2A CN201910113038A CN109701998A CN 109701998 A CN109701998 A CN 109701998A CN 201910113038 A CN201910113038 A CN 201910113038A CN 109701998 A CN109701998 A CN 109701998A
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Abstract
The invention discloses a kind of methods of disposal of flying ash, this method comprises: making its melting with cold crucible technology heating flying ash, the water cooling pond that melt falls into cold crucible bottom forms vitreum slag, solidifies the harmful substances such as the heavy metal in flying dust；Flue gas qualified discharge after fume treatment；Method of the invention, solves the problems, such as the chlorine corrosion of equipment in flying ash high-temperature process, dioxin complete decomposition simultaneously, heavy metals immobilization effect is good, wherein Leaching of Heavy Metals solubility Cr < 0.50mg/L, Ni < 0.30mg/L, Cu < 0.10mg/L, Zn < 0.50mg/L, Cd < 0.03mg/L, Pb < 0.02mg/L in slag, well below standard GB/T 5085.3-2007 " hazardous waste judging standard leaching characteristic identification ", the innoxious and recycling of flying ash is realized.The features such as present invention has service life of equipment long, and process flow is short, and treatment effeciency is high and processing cost is low, is easy to industrial applications.
Description
Technical field
The present invention relates to hazardous waste process field more particularly to a kind of methods of disposal of flying ash.
Background technique
Contain a large amount of poisonous and harmful substance in the flying ash of house refuse, Biohazard Waste etc., is a kind of dangerous useless
Gurry.Flying ash high-temperature process is subjected to building materialsization using the heavy metal that can not only solidify in flying dust and eliminates dioxin reality
Existing innoxious, the building material product that can also obtain high added value realizes recycling, is praised highly flying dust processing domestic and international at present
Technology.However, due in flying dust content of Cl element it is higher, during the high temperature treatment process generate HCl, Cl2Equal sour gas, to setting
It is standby to cause heavy corrosion.Currently, the high temperature smelting furnaces such as common electric arc melting furnace, plasma melting furnace, fuel type melting furnace
It can not all solve the problems, such as the chlorine corrosion in flying dust high-temperature process to fusion apparatus, in addition to using corrosion-resistant lining material at present not yet
There is very good solution method, but corrosion-resistant lining material is at high price and commonly relies on external import.Therefore cause at flying dust high temperature
Reason needs expensive equipment investment, and cost of disposal is high, hinders its industrial applications.
Cold crucible induction melting technology sidewall of crucible in fusion process is in cold conditions always, forms cold slag in crucible internal walls
Shell makes melt and sidewall of crucible be in contactless state, any type of interaction will not occur.But current cold crucible technology master
To be applied to the melting and purification aspect of refractory metal, not yet have application in flying dust processing.
Summary of the invention
Based on the problems of prior art, the object of the present invention is to provide a kind of method of disposal of flying ash, energy
While guaranteeing to dispose effect, extend the service life of disposal facility.
The purpose of the present invention is what is be achieved through the following technical solutions:
Embodiment of the present invention provides a kind of method of disposal of flying ash, comprising:
Flying ash be granulated pre-processing, flying ash grain is made；
Refractory metal block is added in cold crucible reacting furnace, using the high-frequency electric field of cold crucible reacting furnace to high-melting-point gold
Belong to block progress induction heating and be allowed to warm to 1200 DEG C or more, forms the high-temperature metal block as melting flying dust heat source in furnace；
Flying ash grain after granulation is continuously conveyed to the cold crucible reacting furnace, flying ash grain and the cold earthenware
High-temperature metal block in crucible reacting furnace, which is in contact, to be heated to melting and forms flying dust melt, and flying dust melt is by cold crucible reacting furnace
High-frequency electric field induction heating makes the fusing fly ash not melted around flying dust melt, forms flying dust molten bath after expanding flying dust melting zone, flies
Row heat transfer melting is dropped into the subsequent flying ash grain that continuously enters in grey molten bath；
Flying dust after melting flows into lower section water cooling pond quenching from cold crucible reaction furnace bottom and forms glass slag outlet；
The tail gas generated in cold crucible reacting furnace qualified discharge after fume treatment.
As seen from the above technical solution provided by the invention, the disposition side of flying ash provided in an embodiment of the present invention
Method, it has the advantage that:
(1) dioxin complete decomposition: cold crucible in-furnace temperature can effectively decompose two evils in flying dust at 1200~1400 DEG C
The harmful substances such as English；
(2) heavy metals immobilization effect is good: due to the magnetic field at crucible internal walls and the phase between the induced current of melt at this
Interaction produces the unidirectional electromagnetic force that melt is pushed to cold crucible center, i.e. magnetic compression effect.This effect makes to melt
Body generates strong stirring action, therefore the temperature of melt and ingredient can achieve uniformly, is formed by vitreum to heavy metal
Solidification effect it is good, wherein Leaching of Heavy Metals solubility Cr < 0.50mg/L, Ni < 0.30mg/L, Cu < 0.10mg/L, Zn in slag <
0.50mg/L, Cd < 0.03mg/L, Pb < 0.02mg/L, far below standard GB/T 5085.3-2007, " hazardous waste identifies mark
Quasi- leaching characteristic identification "；
(3) treatment effeciency is high: due to magnetic compression effect, strong stirring action is generated between melt, accelerates the molten of flying dust
Melt efficiency, it is short the time required to processing, it is high-efficient；
(4) service life of equipment is long: since melt forms several millimeters of protective layer on cold crucible inner wall, high-temperature fusant with
Cold crucible wall does not contact, and effectively solves chlorine to the etching problem of furnace body, therefore cold crucible long service life.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the method for disposal flow chart of flying ash provided in an embodiment of the present invention.
Specific embodiment
Below with reference to particular content of the invention, technical solution in the embodiment of the present invention is clearly and completely retouched
It states, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts,
Belong to protection scope of the present invention.The content being not described in detail in the embodiment of the present invention belongs to professional and technical personnel in the field
The well known prior art.
As shown in Figure 1, the embodiment of the present invention provides a kind of method of disposal of flying ash, solve at flying ash high temperature
The chlorine corrosion problem of equipment during reason, while realizing the innoxious and recycling of flying ash, process flow is short, processing is imitated
The features such as rate is high, processing cost is low, is easy to industrial applications, comprising:
Flying ash be granulated pre-processing, flying ash grain is made；
Refractory metal block is added in cold crucible reacting furnace, using the high-frequency electric field of cold crucible reacting furnace to high-melting-point gold
Belong to block progress induction heating and be allowed to warm to 1200 DEG C or more, forms the high-temperature metal block as melting flying dust heat source in furnace；
Flying ash grain after granulation is continuously conveyed to the cold crucible reacting furnace, flying ash grain and the cold earthenware
High-temperature metal block in crucible reacting furnace, which is in contact, to be heated to melting and forms flying dust melt, and flying dust melt is by cold crucible reacting furnace
High-frequency electric field induction heating makes the fusing fly ash not melted around flying dust melt, forms flying dust molten bath after expanding flying dust melting zone, flies
Row heat transfer melting is dropped into the subsequent flying ash grain that continuously enters in grey molten bath；
Flying dust after melting flows into lower section water cooling pond quenching from cold crucible reaction furnace bottom and forms glass slag outlet；
The tail gas generated in cold crucible reacting furnace qualified discharge after fume treatment.
In above-mentioned method of disposal, the in-furnace temperature control of cold crucible reacting furnace is 1200~1400 DEG C.
In above-mentioned method of disposal, refractory metal block is the pure metal block or metallic compound block that fusing point is higher than 1400 DEG C
Body.
In above-mentioned method of disposal, refractory metal block is muti-piece.
In above-mentioned method of disposal, flying ash is that house refuse, Biohazard Waste, chemical engineering sludge, waste and old circuit board are burnt
Burn any one in flying dust or any several mixing.
Above-mentioned method of disposal further include: make flue gas return of the tail gas generated in cold crucible reacting furnace after fume treatment
Flying ash grain is made in grain pretreatment processing together with original flying dust, is handled into cold crucible reacting furnace circulation.This
Sample is able to achieve the flying dust of disposition flying dust generation by circular treatment, avoids pollution the direct outlet of flying dust.
Method of disposal of the invention is first granulated flying ash, convenient for being continuously conveyed for flying ash material.In cold crucible
It is conductive convenient for initially being formed flying dust using refractory metal block as heat source in reacting furnace, it can be by high-frequency electric field sense
The flying dust melt that should be heated expands flying dust convenient for the subsequent fusing fly ash not melted around high-frequency electric field induction heating melt
Melting zone ultimately forms flying dust molten bath；It falls into the flying dust material of subsequent entrance in flying dust molten bath, is melted by heat transfer, so as to reality
The continuous feed of existing flying ash.
Method of disposal of the invention, with cold crucible technology melt process flying ash, melt and furnace during processing
It is not in contact between wall, the corrosion of furnace wall can be effectively prevent, reduce the replacement frequency of furnace wall lining material, reduce flying dust cost of disposal；
Flying dust melt forms glass slag through water quenching, can effectively solidify the heavy metal in flying dust, and can be used as the original of part production of construction materials
Material；The tail gas generated in furnace (such as can carry out waste heat recycling, chilling, desulfurization, cloth bag to tail gas after smoke processing system is handled
Dedusting etc. is realized innoxious) qualified discharge.It is solved in flying dust high-temperature process using cold crucible technology processing flying ash
The chlorine corrosion problem of equipment, while the innoxious and recycling of flying dust is realized, it is a kind of ideal flying dust method of disposal.
The embodiment of the present invention is specifically described in further detail below.
Embodiment 1
The method of disposal of the flying ash of the embodiment of the present invention, comprising the following steps:
Domestic garbage incineration flyash is subjected to granulation pretreatment first；Refractory metal is added in cold crucible reacting furnace
Block, high-frequency electric field carry out induction heating to metal block and are allowed to warm to 1200 DEG C, and the heat source of fusing fly ash is formed in furnace；It is granulated
Flying ash afterwards is continuously conveyed by feed system to cold crucible reacting furnace, and flying dust is in contact to be heated with metal block
To fusing, flying dust melt is formed；Flying dust melt is conductive, can further make melt all by high-frequency electric field induction heating
The fusing fly ash not melted is enclosed, expands flying dust melting zone, ultimately forms flying dust molten bath；It is molten that the flying dust material of subsequent entrance falls into flying dust
Chi Zhong is melted by heat transfer, so that the continuous feed of flying dust treating system can be realized；Due at crucible internal walls magnetic field and this at melt
Interaction between the induced current of body produces the unidirectional electromagnetic force that melt is pushed to cold crucible center, makes to melt
Body generates strong stirring action, accelerates the melting and homogenization of flying dust；Flying dust after melting reacts furnace bottom stream from cold crucible
Enter lower section water cooling pond quenching and forms glass slag；The tail gas generated in cold crucible reacting furnace is handled through the smoke processing system of rear end
Realize qualified discharge.Content of beary metal after the present embodiment flying ash and disposition in slag is as shown in table 1, therefrom it can be shown that
After the method for the present invention is disposed, the heavy metal in slag is greatly reduced.
Content of beary metal in 1 domestic garbage incineration flyash of table and slag
Embodiment 2
The method of disposal of the flying ash of the embodiment of the present invention, comprising the following steps:
Domestic garbage incineration flyash is subjected to granulation pretreatment；Flying ash after granulation is continuously conveyed by feed system
To cold crucible reacting furnace, the refractory metal block in furnace is inductively heated under the action of high-frequency electric field is warming up to 1400 DEG C,
Surrounding flying dust is melted, flying dust melt is formed；Flying dust melt is conductive, can by high-frequency electric field induction heating, into
One step makes the fusing fly ash not melted around melt, expands flying dust melting zone, ultimately forms flying dust molten bath；The flying dust object of subsequent entrance
Material is fallen into flying dust molten bath, is melted by heat transfer, so that the continuous feed of flying dust treating system can be realized；At crucible internal walls
Magnetic field and the interaction at this between induced current of melt produce a unidirectional cold crucible center of pushing melt to
Electromagnetic force makes melt generate strong stirring action, accelerates the melting and homogenization of flying dust；Flying dust after melting is anti-from cold crucible
It answers furnace bottom to flow into lower section water cooling pond quenching and forms glass slag；The tail gas generated in cold crucible reacting furnace through the flue gas of rear end at
Qualified discharge is realized in the processing of reason system.The present embodiment flying ash and the content of beary metal in slag after disposition are as shown in table 2, from
In it can be shown that after the method for the present invention is disposed, the heavy metal in slag is greatly reduced.
Content of beary metal in 2 domestic garbage incineration flyash of table and slag
Embodiment 3
The method of disposal of the flying ash of the embodiment of the present invention, comprising the following steps:
Pretreated Biohazard Waste flying ash will be granulated to be continuously conveyed by feed system to cold crucible reacting furnace
Interior, the refractory metal block in furnace is warming up to 1300 DEG C by high-frequency electric field induction heating, and the heat source of fusing fly ash is formed in furnace；
Flying dust is in contact to be heated to fusing with metal block, forms flying dust melt；Flying dust melt can be incuded by high-frequency electric field to be added
Heat further makes the fusing fly ash not melted around melt, expands flying dust melting zone, forms flying dust molten bath；At crucible internal walls
Magnetic field and the interaction at this between induced current of melt, produce one and unidirectional to melt pushed to cold crucible center
Electromagnetic force, so that melt is generated strong stirring action, accelerate the melting and homogenization of flying dust；Flying dust after melting is from cold crucible
It reacts furnace bottom and flows into lower section water cooling pond quenching formation glass slag；Flue gas of the tail gas through rear end generated in cold crucible reacting furnace
Qualified discharge is realized in processing system processing.The present embodiment flying ash and the content of beary metal in slag after disposition are as shown in table 3,
Therefrom it can be shown that after the method for the present invention is disposed, the heavy metal in slag is greatly reduced.
Content of beary metal in 3 Biohazard Waste flying ash of table and slag
Embodiment 4
The method of disposal of the flying ash of the embodiment of the present invention, comprising the following steps:
Chemical engineering sludge flying ash is subjected to granulation pretreatment first；Refractory metal is added in cold crucible reacting furnace
Block, high-frequency electric field carry out induction heating to metal block and are allowed to warm to 1350 DEG C, and the heat source of fusing fly ash is formed in furnace；It is granulated
Flying ash afterwards is continuously conveyed by feed system to cold crucible reacting furnace, and flying dust is in contact to be heated with metal block
To fusing, flying dust melt is formed；Flying dust melt is conductive, can further make melt all by high-frequency electric field induction heating
The fusing fly ash not melted is enclosed, flying dust melting zone is expanded, most always forms flying dust molten bath；Due at crucible internal walls magnetic field and this at melt
Interaction between the induced current of body produces the unidirectional electromagnetic force that melt is pushed to cold crucible center, makes to melt
Body generates strong stirring action, accelerates the melting and homogenization of flying dust；Flying dust after melting reacts furnace bottom stream from cold crucible
Enter lower section water cooling pond quenching and forms glass slag；The tail gas generated in cold crucible reacting furnace is handled through the smoke processing system of rear end
Realize qualified discharge.Content of beary metal after the present embodiment flying ash and disposition in slag is as shown in table 4, therefrom it can be shown that
After the method for the present invention is disposed, the heavy metal in slag is greatly reduced.
Content of beary metal in 4 chemical engineering sludge flying ash of table and slag
Embodiment 5
The method of disposal of the flying ash of the embodiment of the present invention, comprising the following steps:
Electron wastes flying ash is subjected to granulation pretreatment first；Flying ash after granulation is connected by feed system
Continuous to be delivered in cold crucible reacting furnace, the refractory metal block in cold crucible reacting furnace, which is inductively heated, is warming up to 1250 DEG C, flies
Ash is in contact to be heated to fusing with metal block, forms flying dust melt；Flying dust melt is conductive, can be by high-frequency electrical
Field induction heating, further makes the fusing fly ash not melted around melt, expands flying dust melting zone, most always forms flying dust molten bath；Afterwards
The continuous flying dust material entered is fallen into flying dust molten bath, is melted by heat transfer, so that the continuous feed of flying dust treating system can be realized；By
Magnetic field at crucible internal walls and the interaction at this between induced current of melt produce one and unidirectional push away melt
To the electromagnetic force at cold crucible center, melt is made to generate strong stirring action, accelerates the melting and homogenization of flying dust；After melting
Flying dust flows into lower section water cooling pond quenching from cold crucible reaction furnace bottom and forms glass slag；The tail gas generated in cold crucible reacting furnace
Qualified discharge is realized in smoke processing system processing through rear end.The present embodiment flying ash contains with the heavy metal in slag after disposition
As shown in table 5, therefrom it can be shown that after the method for the present invention is disposed, the heavy metal in slag is greatly reduced amount.
Content of beary metal in 5 electron wastes flying ash of table and slag
Method of the invention solves the problems, such as the chlorine corrosion of equipment in flying ash high-temperature process, while dioxin
Complete decomposition, heavy metals immobilization effect is good, wherein Leaching of Heavy Metals solubility Cr < 0.50mg/L, Ni < 0.30mg/L, Cu in slag <
0.10mg/L, Zn < 0.50mg/L, Cd < 0.03mg/L, Pb < 0.02mg/L, well below standard GB/T 5085.3-2007
" hazardous waste judging standard leaching characteristic identification ", realizes the innoxious and recycling of flying ash.The present invention makes with equipment
The features such as long with the service life, process flow is short, and treatment effeciency is high and processing cost is low, is easy to industrial applications.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (6)
1. a kind of method of disposal of flying ash characterized by comprising
Flying ash be granulated pre-processing, flying ash grain is made；
Refractory metal block is added in cold crucible reacting furnace, using the high-frequency electric field of cold crucible reacting furnace to refractory metal block
It carries out induction heating and is allowed to warm to 1200 DEG C or more, form the high-temperature metal block as melting flying dust heat source in furnace；
Flying ash grain after granulation is continuously conveyed to the cold crucible reacting furnace, flying ash grain and the cold crucible are anti-
It answers the high-temperature metal block in furnace to be in contact to be heated to melting and form flying dust melt, flying dust melt is by the high frequency of cold crucible reacting furnace
Electric field induction heating, makes the fusing fly ash not melted around flying dust melt, forms flying dust molten bath after expanding flying dust melting zone, flying dust is molten
Row heat transfer melting is dropped into the subsequent flying ash grain that continuously enters in pond；
Flying dust after melting flows into lower section water cooling pond quenching from cold crucible reaction furnace bottom and forms glass slag outlet；
The tail gas generated in cold crucible reacting furnace qualified discharge after fume treatment.
2. the method for disposal of flying ash according to claim 1, which is characterized in that in the furnace of the cold crucible reacting furnace
Temperature control is 1200~1400 DEG C.
3. the method for disposal of flying ash according to claim 1 or 2, which is characterized in that the refractory metal block is
Fusing point is higher than 1400 DEG C of pure metal block or metallic compound block.
4. the method for disposal of flying ash according to claim 1 or 2, which is characterized in that the refractory metal block is
Muti-piece.
5. the method for disposal of flying ash according to claim 1 or 2, which is characterized in that the flying ash is life
Rubbish, Biohazard Waste, chemical engineering sludge, waste and old circuit board flying ash in any one or any several mixing.
6. the method for disposal of flying ash according to claim 1, which is characterized in that further include:
Flue gas of the tail gas generated in cold crucible reacting furnace after fume treatment is returned and is granulated pretreatment together with original flying dust
Flying ash grain is made in processing, is handled into cold crucible reacting furnace circulation.
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| CN201910113038.2A CN109701998A (en) | 2019-02-13 | 2019-02-13 | A kind of method of disposal of flying ash |
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| CN201910113038.2A CN109701998A (en) | 2019-02-13 | 2019-02-13 | A kind of method of disposal of flying ash |
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| CN111889487A (en) * | 2020-08-03 | 2020-11-06 | 天津大学 | Method for solidifying heavy metal by plasma fusion through multi-source solid waste synergistic treatment |
| CN114472472A (en) * | 2020-10-28 | 2022-05-13 | 杭州正隆环保科技有限公司 | Fly ash comprehensive treatment and utilization system |
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