CN106378352A - Fused salt heat treatment method for rubbish incineration fly ash - Google Patents
Fused salt heat treatment method for rubbish incineration fly ash Download PDFInfo
- Publication number
- CN106378352A CN106378352A CN201611028901.7A CN201611028901A CN106378352A CN 106378352 A CN106378352 A CN 106378352A CN 201611028901 A CN201611028901 A CN 201611028901A CN 106378352 A CN106378352 A CN 106378352A
- Authority
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- China
- Prior art keywords
- fused salt
- group
- heat treatment
- incineration
- refuse flyash
- Prior art date
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- Granted
Links
- 150000003839 salts Chemical class 0.000 title claims abstract description 92
- 239000010881 fly ash Substances 0.000 title claims abstract description 61
- 238000010438 heat treatment Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000010813 municipal solid waste Substances 0.000 title abstract description 7
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 54
- 125000005587 carbonate group Chemical group 0.000 claims description 30
- XTEGARKTQYYJKE-UHFFFAOYSA-N chloric acid Chemical group OCl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-N 0.000 claims description 28
- 238000002844 melting Methods 0.000 claims description 21
- 230000008018 melting Effects 0.000 claims description 21
- 229910052802 copper Inorganic materials 0.000 claims description 18
- 229910052725 zinc Inorganic materials 0.000 claims description 17
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 14
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 14
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 14
- 238000000605 extraction Methods 0.000 claims description 10
- 239000000376 reactant Substances 0.000 claims description 9
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 7
- 239000001103 potassium chloride Substances 0.000 claims description 7
- 235000011164 potassium chloride Nutrition 0.000 claims description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
- 239000011780 sodium chloride Substances 0.000 claims description 7
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 4
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- 239000002956 ash Substances 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 235000013619 trace mineral Nutrition 0.000 abstract description 4
- 239000011573 trace mineral Substances 0.000 abstract description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 3
- 231100000614 poison Toxicity 0.000 abstract description 3
- 230000007096 poisonous effect Effects 0.000 abstract description 3
- 238000002386 leaching Methods 0.000 abstract description 2
- 150000003841 chloride salts Chemical class 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 18
- 229910052745 lead Inorganic materials 0.000 description 17
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 208000020442 loss of weight Diseases 0.000 description 11
- 238000007689 inspection Methods 0.000 description 8
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical compound [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 238000001354 calcination Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 238000001784 detoxification Methods 0.000 description 2
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical class [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006298 dechlorination reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- -1 pottery Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B2101/00—Type of solid waste
- B09B2101/30—Incineration ashes
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a fused salt heat treatment method for rubbish incineration fly ash, and belongs to ash treatment methods. The method solves the problems that the treatment temperature is high, the energy consumption is large and poisonous trace elements cause secondary pollution through existing treatment methods for the rubbish incineration fly ash. The method includes the steps of preparing mixed fused salt, carrying out fusing heat treatment, detecting the content of heavy metal and extracting and recovering the heavy metal. According to the method, chlorides, sulfate and partial heavy metal in the fly ash can be dissolved out through the fusing, heat storing and reacting characteristics of the fused salt, processes are relatively simple, reaction conditions are mild and easy to control, leaching of the heavy metal in the fly ash can be effectively controlled in an environment, the treated fused salt can be recycled, deep enrichment and recovery of the dissolved heavy metal can be carried out, the harm level of treated residues is greatly lowered, building material utilization and secure landfill of the treated residues can be conveniently carried out, secondary pollution is effectively reduced, the resource utilization efficiency is improved, and light reduction, harmlessness and resource utilization of the rubbish incineration fly ash can be realized synchronously.
Description
Technical field
The invention belongs to lime-ash processing method, more particularly, to a kind of incineration of refuse flyash fused salt heat treatment method, it is suitable to rubbish
Rubbish flying ash loss of weight, innoxious and recycling.
Background technology
Create substantial amounts of flying dust in Refuse Incineration Process, wherein contain the poisonous and harmful substances such as heavy metal, two English, no
Rational process disposal is introduced into potential environmental hazard.After traditional cement solidification and security landfill technology are so that process
Flying dust increase-volume is increased weight, and results in the need for the final disposal that more land resources carry out flying dust, also will contain in waste flying dust simultaneously
A large amount of inorganic mineral resources, the especially non-ferrous metal such as Pb, Zn, Cu.With respect to traditional cement solidification and security landfill skill
Art, high-temperature heat treatment technology can effectively decompose two English in flying dust, quickly realizes at volume reduction loss of weight and the detoxification of flying dust
Reason, residue after heat treatment can be also used for the making of the building materials such as pottery, cement.But high-temperature process high energy consumption, and
With discharging again of a large amount of toxic trace elements, and the building materialsization being unfavorable for follow-up residue are utilized by the Cl containing in flying dust.
Publication number CN101074457B Chinese patent by mixed pelletizings such as incineration of refuse flyash and calcium hydroxides, 1400 DEG C～
Melt process flying dust at 1480 DEG C.Incineration of refuse flyash is carried out extraction dechlorination by publication number CN1759941B Chinese patent, will take off
Flying dust after chlorine carries out melt process at 1230 DEG C～1300 DEG C, and by heavy metals immobilization in molten ash.Publication number
After incineration of refuse flyash is granulated by CN1987202A Chinese patent, 800～1400 DEG C of calcinings in rotary calcining stove are disposed.Public
The number of opening CN105712733A Chinese patent provides the waste incineration by chloride gasifying agent after 800 DEG C～1000 DEG C calcination process
Flying dust and living beings etc. bakee through 850 DEG C～1050 DEG C of high temperature, the method preparing multiporous biological haydite.Disclosed in these specially
Profit or patent application, treatment temperature is higher, and energy consumption is big and is difficult to evade the secondary pollution that toxic trace elements discharge initiation again
Problem.
Publication number CN104772317A Chinese patent discloses titanium tetrachloride fused salt chlorimation and produces waste fused salt and dust-slag collection
A kind of integrated treatment method, while mitigating its environmental hazard, recovery section valuable element.Publication number CN104399732A China
Patent provides the device and method that a kind of fuse salt is pyrolyzed solid waste, can improve the decomposition rate of organic matter, and
Trapping or conversion sour gas and harmful components.Publication number CN105384170A Chinese patent provides one kind in fused-salt medium
The method making activated carbon using waste and old textile fiber material.In patent disclosed in these or patent application, fused salt heat utilization
Journey only concentrates the cracking process for organic matter, rarely has and is related to the heat treatment disposal to flying dust mineral-type component.
Content of the invention
The present invention provides a kind of incineration of refuse flyash fused salt heat treatment method, solves conventional garbage flying ash processing method
Treatment temperature is higher, and energy consumption is big and is difficult to evade the problem that toxic trace elements discharge initiation secondary pollution again, to realize flying
It is possible to synchronous recovery section heavy metal resources, residue after treatment can carry out follow-up building materials for the loss of weight of ash and detoxification
Change to process and dispose or security landfill.
A kind of incineration of refuse flyash fused salt heat treatment method provided by the present invention is it is characterised in that comprise the steps：
(1) a group in carbonate group, chlorate group or two groups are mixed, heating obtains fused salt mixt；Two groups are entered
During row mixing, the mass percent between two groups is any；
Or NaOH is mixed with a group or two groups in carbonate group, chlorate group, heating is mixed
Fused salt；
When NaOH is mixed with a group in carbonate group, chlorate group, the mass percent of NaOH
≤ 10%, remaining is carbonate group or chlorate group；
When NaOH is mixed with two groups in carbonate group, chlorate group, the mass percent of NaOH
≤ 10%, remaining is carbonate group and chlorate group, and the mass percent between carbonate group and chlorate group is any；
(2) add incineration of refuse flyash in described fused salt mixt, carry out melting heat treatment, the reactant obtaining is through undue
From obtaining two grades of fused salts and residue；Described fused salt mixt is 3 with the mass ratio of incineration of refuse flyash:1～20:1；
(3) described residue carries out building materialsization utilization or security landfill after treatment；To described two grades of fused salts, inspection is wherein
Whether the content of Pb, Zn or Cu respectively reaches 0.7%, 1%, the 0.4% of incineration of refuse flyash quality, is, carries out step (4),
Otherwise as fused salt mixt, go to step (2)；
(4) extraction that described two grades of fused salts are carried out with heavy metal is reclaimed.
In described step (1), described carbonate group can be mass percent 33.3%～50% sodium carbonate, 33.3%
～50% potassium carbonate and the mixture of 0%～33.4% lithium carbonate；
Described chlorate group can be sodium chloride, 33.3%～50% potassium chloride of mass percent 33.3%～50%
And the mixture of 0%～33.4% calcium chloride.
In described step (1), when heating obtains fused salt mixt, heating-up temperature can be 400 DEG C～900 DEG C.
In described step (2), melting heat treatment temperature can be 400 DEG C～850 DEG C, time of heat treatment can for 2h～
10h.
The present invention will be heat-treated in the fused salt of flying dust addition melting, and flying dust is completely submerged in fused salt, using fused salt
Excellent melting, accumulation of heat and response characteristic, in flying dust, various composition effectively can be fully contacted with fused salt, uniformly fully conducts
To the heat of fused salt, thus improving mass transfer and heat transfer efficiency, realize chloride in flying dust, sulfate and part heavy metal etc. poisonous
The dissolution of harmful substance.Within the scope of relatively low temperature, can effectively utilizes energy, incineration of refuse flyash subtracts realizing volume reduction
While weight, can be with depth enrichment and recovery section heavy metal, the residue extent of injury after processing through fused salt is greatly reduced, and is easy to
Follow-up building materialsization utilize and security landfill, it is possible to achieve resource coordinating acts on.
The present invention utilizes the excellent melting of fused salt, accumulation of heat and response characteristic, realizes chloride in flying dust, sulfate and part
The dissolution of heavy metal, operation is relatively easy, and reaction temperature is relatively low easily controllable, can effectively evade in flying dust heavy metal in environment
In leaching problem, the fused salt disposing flying dust can recycle, and the heavy metal of dissolution can carry out depth enrichment and recovery,
The residue extent of injury after process is greatly reduced, and is easy to follow-up building materialsization and utilizes and security landfill, effectively reduces secondary dirt
Dye, improves the level of resources utilization, can synchronously realize the loss of weight of incineration of refuse flyash, innoxious and recycling.
Brief description
Fig. 1 is schematic flow sheet of the present invention.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in more detail.
Embodiment 1
(1) carbonate group is mixed, heating at 900 DEG C obtains fused salt mixt；Described carbonate group is quality
The mixture of the lithium carbonate of the sodium carbonate of percentage 33.3%, 33.3% potassium carbonate and 33.4%；
(2) add incineration of refuse flyash in described fused salt mixt, carry out melting heat treatment, the reactant obtaining is through undue
From obtaining two grades of fused salts and residue；Described fused salt mixt is 10 with the mass ratio of incineration of refuse flyash:1；Melting heat treatment temperature
For 850 DEG C, the time of heat treatment is 2h；
Test wherein mass of residue and content of beary metal respectively；
(3) described residue carries out building materialsization utilization or security landfill after treatment；To described two grades of fused salts, inspection is wherein
Whether the content of Pb, Zn or Cu respectively reaches 0.7%, 1%, the 0.4% of incineration of refuse flyash quality, is, carries out step (4),
Otherwise as fused salt mixt, go to step (2)；
(4) extraction that described two grades of fused salts are carried out with heavy metal is reclaimed.
Test incineration of refuse flyash quality and content of beary metal in advance, the present embodiment incineration of refuse flyash loss of weight 63.4%,
Cu content reduces 29.7%, Pb content and reduces 22.6%, Zn content minimizing 18.7%.
Embodiment 2
(1) chlorate group is mixed, heating at 400 DEG C obtains fused salt mixt；Described chlorate group is quality
The sodium chloride of percentage 33.3%, the mixture of 33.3% potassium chloride and 33.4% calcium chloride；
(2) add incineration of refuse flyash in described fused salt mixt, carry out melting heat treatment, the reactant obtaining is through undue
From obtaining two grades of fused salts and residue；Described fused salt mixt is 3 with the mass ratio of incineration of refuse flyash:1；Melting heat treatment temperature
For 400 DEG C, the time of described heat treatment is 4h；
(3) described residue carries out building materialsization utilization or security landfill after treatment；To described two grades of fused salts, inspection is wherein
Whether the content of Pb, Zn or Cu respectively reaches 0.7%, 1%, the 0.4% of incineration of refuse flyash quality, is, carries out step (4),
Otherwise as fused salt mixt, go to step (2)；
(4) extraction that described two grades of fused salts are carried out with heavy metal is reclaimed.
Test incineration of refuse flyash quality and content of beary metal in advance, the present embodiment incineration of refuse flyash loss of weight 68.8%,
Cu content reduces 29.3%, Pb content and reduces 24.7%, Zn content minimizing 16.4%.
Embodiment 3
(1) carbonate group and chlorate group are mixed, heating at 600 DEG C obtains fused salt mixt；Carbonate group
It is 60% with chlorate group mass percent：40%；
Described carbonate group be the sodium carbonate of mass percent 50% and 50% potassium carbonate mixture, described chlorate
Organize the mixture of the potassium chloride for the sodium chloride of mass percent 50% and 50%；
(2) add incineration of refuse flyash in described fused salt mixt, carry out melting heat treatment, the reactant obtaining is through undue
From obtaining two grades of fused salts and residue；Described fused salt mixt is 20 with the mass ratio of incineration of refuse flyash:1；Melting heat treatment temperature
For 600 DEG C, the time of described heat treatment is 10h；
Test wherein mass of residue and content of beary metal respectively；
(3) described residue carries out building materialsization utilization or security landfill after treatment；To described two grades of fused salts, inspection is wherein
Whether the content of Pb, Zn or Cu respectively reaches 0.7%, 1%, the 0.4% of incineration of refuse flyash quality, is, carries out step (4),
Otherwise as fused salt mixt, go to step (2)；
(4) extraction that described two grades of fused salts are carried out with heavy metal is reclaimed.
Test incineration of refuse flyash quality and content of beary metal in advance, the present embodiment incineration of refuse flyash loss of weight 60.9%,
Cu content reduces 21.5%, Pb content and reduces 18.4%, Zn content minimizing 16.5%.
The quality reclaiming Cu, Pb, the Zn obtaining accounts for 0.86%, 1.12%, the 0.63% of incineration of refuse flyash quality respectively.
Embodiment 4
(1) NaOH is mixed with carbonate group, heating at 750 DEG C obtains fused salt mixt；NaOH
Mass percent with carbonate group is 10%：90%；
Described carbonate group is the mixed of the lithium carbonate of the sodium carbonate of mass percent 34%, 34% potassium carbonate and 32%
Compound；
(2) add incineration of refuse flyash in described fused salt mixt, carry out melting heat treatment, the reactant obtaining is through undue
From obtaining two grades of fused salts and residue；Described fused salt mixt is 15 with the mass ratio of incineration of refuse flyash:1；Melting heat treatment temperature
For 750 DEG C, the time of described heat treatment is 6h；
Test wherein mass of residue and content of beary metal respectively；
(3) described residue carries out building materialsization utilization or security landfill after treatment；To described two grades of fused salts, inspection is wherein
Whether the content of Pb, Zn or Cu respectively reaches 0.7%, 1%, the 0.4% of incineration of refuse flyash quality, is, carries out step (4),
Otherwise as fused salt mixt, go to step (2)；
(4) extraction that described two grades of fused salts are carried out with heavy metal is reclaimed.
Test incineration of refuse flyash quality and content of beary metal in advance, the present embodiment incineration of refuse flyash loss of weight 63.9%,
Cu content reduces 18.7%, Pb content and reduces 16.4%, Zn content minimizing 13.6%.
Embodiment 5
(1) NaOH is mixed with chlorate group, heating at 600 DEG C obtains fused salt mixt；NaOH
Percent mass with chlorate group is frequently 9.1%：90.9%；
Described chlorate group be the sodium chloride of mass percent 50% and 50% potassium chloride mixture；
(2) add incineration of refuse flyash in described fused salt mixt, carry out melting heat treatment, the reactant obtaining is through undue
From obtaining two grades of fused salts and residue；Described fused salt mixt is 20 with the mass ratio of incineration of refuse flyash:1；Melting heat treatment temperature
For 600 DEG C, the time of described heat treatment is 10h；
Test wherein mass of residue and content of beary metal respectively；
(3) described residue carries out building materialsization utilization or security landfill after treatment；To described two grades of fused salts, inspection is wherein
Whether the content of Pb, Zn or Cu respectively reaches 0.7%, 1%, the 0.4% of incineration of refuse flyash quality, is, carries out step (4),
Otherwise as fused salt mixt, go to step (2)；
(4) extraction that described two grades of fused salts are carried out with heavy metal is reclaimed.
Test incineration of refuse flyash quality and content of beary metal in advance, the present embodiment incineration of refuse flyash loss of weight 63.6%,
Cu content reduces 21.7%, Pb content and reduces 18.9%, Zn content minimizing 15.5%.
Embodiment 6
(1) NaOH is mixed with carbonate group, chlorate group, heating at 800 DEG C obtains fused salt mixt；
NaOH is 5% with the mass percent of carbonate group, chlorate group：56%：39%；
Described carbonate group be the sodium carbonate of mass percent 50% and 50% potassium carbonate mixture, described chlorate
Organize the mixture of the potassium chloride for the sodium chloride of mass percent 50% and 50%；
(2) add incineration of refuse flyash in described fused salt mixt, carry out melting heat treatment, the reactant obtaining is through undue
From obtaining two grades of fused salts and residue；Described fused salt mixt is 20 with the mass ratio of incineration of refuse flyash:1；Melting heat treatment temperature
For 800 DEG C, the time of described heat treatment is 8h；
Test wherein mass of residue and content of beary metal respectively；
(3) described residue carries out building materialsization utilization or security landfill after treatment；To described two grades of fused salts, inspection is wherein
Whether the content of Pb, Zn or Cu respectively reaches 0.7%, 1%, the 0.4% of incineration of refuse flyash quality, is, carries out step (4),
Otherwise as fused salt mixt, go to step (2)；
(4) extraction that described two grades of fused salts are carried out with heavy metal is reclaimed.
Test incineration of refuse flyash quality and content of beary metal in advance, the present embodiment incineration of refuse flyash loss of weight 61.6%,
Cu content reduces 20.7%, Pb content and reduces 18.0%, Zn content minimizing 15.9%.
Embodiment 7
(1) NaOH is mixed with carbonate group, chlorate group, heating at 800 DEG C obtains fused salt mixt；
NaOH is 10% with the mass percent of carbonate group, chlorate group：50%：40%；
Described carbonate group is the carbonic acid of the sodium carbonate of mass percent 33.3%, 33.3% potassium carbonate and 33.4%
The mixture of lithium, described chlorate group be the sodium chloride of mass percent 50% and 50% potassium chloride mixture；
(2) add incineration of refuse flyash in described fused salt mixt, carry out melting heat treatment, the reactant obtaining is through undue
From obtaining two grades of fused salts and residue；Described fused salt mixt is 18 with the mass ratio of incineration of refuse flyash:1；Melting heat treatment temperature
For 850 DEG C, the time of described heat treatment is 10h；
Test wherein mass of residue and content of beary metal respectively；
(3) described residue carries out building materialsization utilization or security landfill after treatment；To described two grades of fused salts, inspection is wherein
Whether the content of Pb, Zn or Cu respectively reaches 0.7%, 1%, the 0.4% of incineration of refuse flyash quality, is, carries out step (4),
Otherwise as fused salt mixt, go to step (2)；
(4) extraction that described two grades of fused salts are carried out with heavy metal is reclaimed.
Test incineration of refuse flyash quality and content of beary metal in advance, the present embodiment incineration of refuse flyash loss of weight 63.7%,
Cu content reduces 23.3%, Pb content and reduces 19.2%, Zn content minimizing 17.1%.
Claims (4)
1. a kind of incineration of refuse flyash fused salt heat treatment method is it is characterised in that comprise the steps：
(1) a group in carbonate group, chlorate group or two groups are mixed, heating obtains fused salt mixt；Two groups are mixed
During conjunction, the mass percent between two groups is any；
Or NaOH is mixed with a group or two groups in carbonate group, chlorate group, heating obtains fused salt mixt；
When NaOH is mixed with a group in carbonate group, chlorate group, the mass percent of NaOH≤
10%, remaining is carbonate group or chlorate group；
When NaOH is mixed with two groups in carbonate group, chlorate group, the mass percent of NaOH≤
10%, remaining is carbonate group and chlorate group, and the mass percent between carbonate group and chlorate group is any；
(2) add incineration of refuse flyash in described fused salt mixt, carry out melting heat treatment, the reactant obtaining passes through and separates,
Obtain two grades of fused salts and residue；Described fused salt mixt is 3 with the mass ratio of incineration of refuse flyash:1～20:1；
(3) described residue carries out building materialsization utilization or security landfill after treatment；To described two grades of fused salts, check wherein Pb,
Whether the content of Zn or Cu respectively reaches 0.7%, 1%, the 0.4% of incineration of refuse flyash quality, is, carries out step (4), no
Then as fused salt mixt, go to step (2)；
(4) extraction that described two grades of fused salts are carried out with heavy metal is reclaimed.
2. incineration of refuse flyash fused salt heat treatment method as claimed in claim 1 it is characterised in that：
In described step (1), described carbonate group is the sodium carbonate of mass percent 33.3%～50%, 33.3%～50%
Potassium carbonate and 0%～33.4% lithium carbonate mixture；
Described chlorate group is the sodium chloride of mass percent 33.3%～50%, 33.3%～50% potassium chloride and 0%
The mixture of～33.4% calcium chloride.
3. incineration of refuse flyash fused salt heat treatment method as claimed in claim 1 or 2 it is characterised in that：Described step (1)
In, when heating obtains fused salt mixt, heating-up temperature is 400 DEG C～900 DEG C.
4. incineration of refuse flyash fused salt heat treatment method as claimed in claim 1 or 2 it is characterised in that：Described step (2)
In, melting heat treatment temperature is 400 DEG C～850 DEG C, and the time of heat treatment is 2h～10h.
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