CN102641776A - Method for recovering lead in secondary fly ash by iron slurry - Google Patents
Method for recovering lead in secondary fly ash by iron slurry Download PDFInfo
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- CN102641776A CN102641776A CN2012101253821A CN201210125382A CN102641776A CN 102641776 A CN102641776 A CN 102641776A CN 2012101253821 A CN2012101253821 A CN 2012101253821A CN 201210125382 A CN201210125382 A CN 201210125382A CN 102641776 A CN102641776 A CN 102641776A
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- iron powder
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- heavy metal
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000002002 slurry Substances 0.000 title claims abstract description 22
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 10
- 239000010881 fly ash Substances 0.000 title abstract description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 42
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 36
- 239000011780 sodium chloride Substances 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 239000002699 waste material Substances 0.000 claims abstract description 16
- 238000011084 recovery Methods 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 238000005554 pickling Methods 0.000 claims abstract description 7
- 238000007885 magnetic separation Methods 0.000 claims description 8
- 230000008929 regeneration Effects 0.000 claims description 8
- 238000011069 regeneration method Methods 0.000 claims description 8
- 239000004570 mortar (masonry) Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims 1
- 229910017604 nitric acid Inorganic materials 0.000 claims 1
- 239000002956 ash Substances 0.000 abstract description 45
- 238000005245 sintering Methods 0.000 abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 1
- 229910052739 hydrogen Inorganic materials 0.000 abstract 1
- 239000001257 hydrogen Substances 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 230000001172 regenerating effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 13
- 238000002386 leaching Methods 0.000 description 11
- 239000000243 solution Substances 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 231100000419 toxicity Toxicity 0.000 description 10
- 230000001988 toxicity Effects 0.000 description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 8
- 239000000428 dust Substances 0.000 description 8
- 239000000047 product Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 239000000872 buffer Substances 0.000 description 3
- 239000003610 charcoal Substances 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000002920 hazardous waste Substances 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000007613 slurry method Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000004056 waste incineration Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229910018557 Si O Inorganic materials 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- BDGYOXLDSUTJGA-UHFFFAOYSA-N gold;oxalonitrile Chemical compound [Au].N#CC#N BDGYOXLDSUTJGA-UHFFFAOYSA-N 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for recovering lead in secondary fly ash by iron slurry, which includes steps of firstly, mixing and stirring secondary fly ash, NaCl (sodium chloride) slurry having a certain pH (potential of hydrogen) valve and iron powder; secondly, separating iron powder magnetically to obtain heavy-metal-carried iron powder and tail slurry; thirdly, recycling iron powder after pickling and regenerating while recovering heavy metal; fourthly, treating the tail slurry by solid-and-liquid separation to obtain residual ash and waste NaCl liquid, wherein the residual ash is sent to a landfill to be buried and the waste NaCl liquid is recycled. The method is applicable to recovery of Pb of products of secondary fly ash during ceramsite sintering or fusing treatment of fly ash in waste, and has the advantages of high separating efficiency, operational simplicity, low cost and no secondary pollution and the like.
Description
Technical field
The invention belongs to the environmental pollution treatment technology field, the new method of Pb Separation and Recovery in the secondary flying ash is provided especially.
Background technology
Garbage incineration technology has unique advantage at innoxious, minimizing, aspect such as recover energy, and this technology in recent years in China's waste incineration and generating electricity development rapidly.The waste incineration meeting produces the flying ash that contains toxicants such as heavy metal and dioxin, and flying ash has been put into national hazardous waste register, must carry out specially treated.The curing/stabilizing of flying ash is treated as the focus that efforts at environmental protection person pays close attention to; Research work is extensively carried out between each related discipline, has progressively formed the cement solidification of flying dust, the chemicals treatment of flying dust, the treatment technologies such as bitumen solidification, flying dust sintering ceramsite and fusing fly ash of flying dust.Wherein, the first three treatment technology all with stabilizing heavy metal, reducing it, to ooze drop property be main target, the end product volume after the processing has increase in various degree, can not realize the minimizing that danger wastes is handled; Secondly toxic heavy metal finally is accumulated in the environment, and long-time stability can not guarantee, and can not eliminate the potential danger of bioxin to environment, and it is thoroughly innoxious to fail to realize that danger wastes is handled; Three, useless, non-renewable resources that the product after stable becomes can not realize the resource of danger wastes.Two kinds of technology of flying dust sintering ceramsite and fusing fly ash are carried out high-temperature process through haydite kiln and melting furnace system to incineration of refuse flyash respectively; With the dioxin pyrolytic; In the Si-O grid that the part heavy metal is cured in; And can be with the utilization of product building materials, really realized the requirement of minimizing that danger wastes handles, innoxious, resource.But in flying dust sintering ceramsite or fusing fly ash processing procedure, low boiling heavy metal such as Zn, Pb etc. volatilize easily and are collected in the solid residue that flue gas purification system collects in the flying dust, and these solid residues are commonly referred to secondary flying ash.The secondary flying ash that fusion produces is divided into danger wastes because of the heavy metal that contains a great deal of etc. by Japan and other countries.The concentration of Zn, Pb is 5～10 times of former incineration of refuse flyash in the secondary flying ash, near head grade, therefore, considers to be necessary to extract and reclaim these metals from environment and economic angle.
Heavy metal has had report in the employing hydrometallurgical technology extraction secondary flying ash; In these researchs; Usually adopt traditional acid, alkali to leach medium and extract heavy metal, its leaching process roughly comprises salt acidleach-filtration-neutralization-sulfuration-filtration-steps such as waste water evaporative crystallization, though the separable purity that obtains of this method reaches 30～40% contain Pb and contain two kinds of products of Zn; But not exclusively cause heavy metal easily especially the separative efficiency of Pb is lower owing to filter; And the waste liquid that contains the high concentration heavy metal sneaks into residue, and residue also need wash before final disposal or be stable, complex process.
Carbon slurry method (CIP) is widely used in the cyanidation gold-extracted technology at first; Active carbon in this technology (using coconut carbon and mud coal carbon usually) is as the absorption carrier of gold; Gold cyanogen complex ion is adsorbed on the active carbon with microcellular structure, and granularity of activated carbon is much thicker than ore particle, carries golden carbon and separates with ore pulp and can on simple and mechanical screening plant, carry out; Effective like this solid-liquid isolated by filtration operation of having avoided has reduced the cost with high investment of filtration and adverse current decant(-ation) system.Afterwards.For year golden charcoal and ore pulp in the further solution traditional C IP technology are crossed the dissatisfactory problem of screening effect; Magnetic carbon-in-pulp process (MIP) has appearred again; This method is to make magnetic on the active carbon band and record golden charcoal back and forth with magnetic separator; So just can obstructedly sieve and assign to, thereby further reduce the loss of gold in tailings from a year golden charcoal.
Summary of the invention
The present invention is directed to secondary flying ash and contain heavy metal such as a considerable amount of Pb and belong to hazardous waste, there are problems in the method for external sedimentation and filtration commonly used, uses for reference the carbon slurry technology of ripe gold industry.Utilize the heavy metal in the iron slurry method separated secondary flying dust, separate end product and mainly comprise residue, heavy metal.Pb after the separation can be used as smeltery's raw material and recycles; It is all very low with content of beary metal to filter in the residual residue of back villaumite, and volume reduces significantly, can directly send into its final safe disposal of landfill yard landfill realization.Concrete steps comprise: (1) is hybridly prepared into mortar with the NaCl solution of secondary flying ash and certain pH value, in mortar, adds iron powder and stirs; (2) iron powder in the step (1) is carried out magnetic separation, obtain adsorbing the iron powder and the tail slurry of heavy metal after the magnetic separation; The iron powder of the absorption heavy metal that (3) step (2) is obtained carries out pickling regeneration, and the iron powder after the regeneration carries out recycle, realizes the recovery of Pb simultaneously; (4) tail slurry that step (2) is obtained carries out Separation of Solid and Liquid to be handled, and separates obtaining residual ash and NaCl waste liquid, and residual ash send the landfill yard landfill disposal, and the NaCl waste liquid carries out recycle;
The mass ratio of said iron powder and secondary flying ash is 1: 1～4: 1.
Said NaCl solution concentration is 2～7mol/L.
Said NaCl pH value of solution value is 1～7.
Advantage and good effect that the present invention has are: but starch extraction and the recovery that Pb in the secondary flying ash is realized on method high efficiency, low cost ground with iron; No matter remain residual ash is that volume or toxicity all reduce significantly, advances the landfill yard landfill disposal or the building materials utilization creates favorable conditions for follow-up.And technology of the present invention need not be washed and stable supervisor, have simple to operate, cost is low, treatment effect good and do not have advantages such as secondary pollution.
Description of drawings
Fig. 1 is that Pb reclaims process chart in the secondary flying ash
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, the following examples of giving an example now, and conjunction with figs. specifies as follows:
Principle of the present invention is: NaCl solution is leached into heavy metal in the secondary flying ash in the solution as leaching agent; Iron powder has stronger reducing power and magnetic; In solution generation electrochemical reducting reaction can be with metal activity command table, arrange in thereafter Pb etc. and cement out; Drop on iron powder surface or with its generation cementation and be adsorbed on the iron powder surface, adopt magnet that iron powder magnetic separation from solution is separated after a period of time, the heavy metals such as Pb that cementation takes place are just separated from secondary flying ash.
Embodiment 1:
The content of beary metal of secondary flying ash reaches according to solid waste toxicity leaching method-sulfuric acid nitrate method (HJ/T299-2007) incineration of refuse flyash is carried out the toxicity leaching behind certain incineration of refuse flyash sintering ceramsite, and its result sees table 1.With 20g secondary flying ash and concentration be 2mol/L, pH value be 1 NaCl solution mix stir 30 minutes after; In mortar, add the 20g iron powder and continue to stir 2h; Carry out magnetic separation afterwards and obtain the iron powder and the tail slurry of load-carrying metal, wherein iron powder recycles after pickling regeneration, realizes the recovery to heavy metal simultaneously; Tail slurry carries out Separation of Solid and Liquid to be handled, and separates obtaining residual ash and NaCl waste liquid.
Pb content, leaching toxicity, the Pb rate of recovery and residual ash leach concentration in table 1 embodiment 1 secondary flying ash
Heavy metal in the products such as residual ash after separating is analyzed; And the calculating heavy metal rate of recovery; Its result sees table 1; Dried residual ash is pressed acetic acid buffer memory solwution method (HJ/T300-2007) measure heavy metal concentration in the leachate, Pb concentration is lower than heavy metal contaminants concentration limit among the GB16889-2008 in the leachate, and above-mentioned data show that this residual ash can directly advance the household refuse landfill sites landfill.
Embodiment 2:
The content of beary metal of secondary flying ash reaches according to solid waste leaching toxicity leaching method-sulfuric acid nitrate method (HJ/T299-2007) and incineration of refuse flyash is carried out toxicity leach behind certain incineration of refuse flyash sintering ceramsite, and its result sees table 2.With 20g secondary flying ash and concentration be 4mol/L, pH value be 5 NaCl solution mix stir 30 minutes after; In mortar, add the 40g iron powder and continue to stir 2h; Carry out magnetic separation afterwards and obtain the iron powder and the tail slurry of load-carrying metal, wherein iron powder recycles after pickling regeneration, realizes the recovery to heavy metal simultaneously; Tail slurry carries out Separation of Solid and Liquid to be handled, and separates obtaining residual ash and NaCl waste liquid.
Pb content, leaching toxicity, the Pb rate of recovery and residual ash leach concentration in table 2 embodiment 2 secondary flying ash
Heavy metal in the products such as residual ash after separating is analyzed; And the calculating heavy metal rate of recovery; Its result sees table 2; Dried residual ash is pressed acetic acid buffer memory solwution method (HJ/T300-2007) measure heavy metal concentration in the leachate, Pb concentration is lower than heavy metal contaminants concentration limit among the GB16889-2008 in the leachate, and above-mentioned data show that this residual ash can directly advance the household refuse landfill sites landfill.
Embodiment 3:
The content of beary metal of secondary flying ash reaches according to solid waste leaching toxicity leaching method-sulfuric acid nitrate method (HJ/T299-2007) and incineration of refuse flyash is carried out toxicity leach behind certain incineration of refuse flyash sintering ceramsite, and its result sees table 3.With 20g secondary flying ash and concentration be 7mol/L, pH value be 7 NaCl solution mix stir 30 minutes after; In mortar, add the 80g iron powder and continue to stir 2h; Carry out magnetic separation afterwards and obtain the iron powder and the tail slurry of load-carrying metal, wherein iron powder recycles after pickling regeneration, realizes the recovery to heavy metal simultaneously; Tail slurry carries out Separation of Solid and Liquid to be handled, and separates obtaining residual ash and NaCl waste liquid.
Pb content, leaching toxicity, the Pb rate of recovery and residual ash leach concentration in table 3 embodiment 3 secondary flying ash
Heavy metal in the products such as residual ash after separating is analyzed; And the calculating heavy metal rate of recovery; Its result sees table 3; Dried residual ash is pressed acetic acid buffer memory solwution method (HJ/T300-2007) measure heavy metal concentration in the leachate, Pb concentration is lower than heavy metal contaminants concentration limit among the GB16889-2008 in the leachate, and above-mentioned data show that this residual ash can directly advance the household refuse landfill sites landfill.
Although combine accompanying drawing that the preferred embodiments of the present invention are described above; But the present invention is not limited to the above-mentioned specific embodiment, and the above-mentioned specific embodiment only is schematically, is not restrictive; Those of ordinary skill in the art is under enlightenment of the present invention; Not breaking away under the scope situation that aim of the present invention and claim protect, can also make a lot of forms, these all belong within protection scope of the present invention.
Claims (5)
1. the iron slurry reclaims method plumbous in the secondary flying ash, it is characterized in that, comprises the steps:
(1) the NaCl solution with secondary flying ash and certain pH value is hybridly prepared into mortar, in mortar, adds iron powder and stirs;
(2) iron powder in the step (1) is carried out magnetic separation, obtain adsorbing the iron powder and the tail slurry of heavy metal after the magnetic separation;
The iron powder of the absorption heavy metal that (3) step (2) is obtained carries out pickling regeneration, and the iron powder after the regeneration carries out recycle, realizes the recovery of heavy metal simultaneously;
(4) tail slurry that step (2) is obtained carries out Separation of Solid and Liquid to be handled, and separates obtaining residual ash and NaCl waste liquid, and residual ash send the landfill yard landfill disposal, and the NaCl waste liquid carries out recycle.
2. iron slurry according to claim 1 reclaims method plumbous in the secondary flying ash, it is characterized in that the mass ratio of said iron powder and secondary flying ash is 1: 1～4: 1.
3. iron slurry according to claim 1 reclaims method plumbous in the secondary flying ash, it is characterized in that said NaCl solution concentration is 2～7mol/L.
4. iron slurry according to claim 1 reclaims method plumbous in the secondary flying ash, it is characterized in that said NaCl pH value of solution value is 1～7.
5. iron slurry according to claim 1 reclaims method plumbous in the secondary flying ash, it is characterized in that, pickling regeneration adopts acid to be nitric acid or hydrochloric acid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210125382.1A CN102641776B (en) | 2012-04-26 | 2012-04-26 | Method for recovering lead in secondary fly ash by iron slurry |
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| CN102641776B CN102641776B (en) | 2014-07-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105149317A (en) * | 2015-07-31 | 2015-12-16 | 河南师范大学 | Method for removing heavy metals in hazardous waste incineration fly ash through nanometer zero-valent iron |
| CN112893416A (en) * | 2021-02-05 | 2021-06-04 | 南京理工大学 | Recycling method of fly ash and fly ash hydrothermal treatment fluid |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110468284A (en) * | 2019-09-10 | 2019-11-19 | 广州大学 | A method of utilizing heavy metal in magnetic iron ore modifier processing solid waste burning flying dust |
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| JP2003321716A (en) * | 2002-04-30 | 2003-11-14 | Taiheiyo Cement Corp | Treatment method for calcium and heavy metal- containing material |
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| JP2003321716A (en) * | 2002-04-30 | 2003-11-14 | Taiheiyo Cement Corp | Treatment method for calcium and heavy metal- containing material |
| JP2007154236A (en) * | 2005-12-02 | 2007-06-21 | Oji Paper Co Ltd | Method for separating lead from combustion ash |
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Cited By (2)
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| CN105149317A (en) * | 2015-07-31 | 2015-12-16 | 河南师范大学 | Method for removing heavy metals in hazardous waste incineration fly ash through nanometer zero-valent iron |
| CN112893416A (en) * | 2021-02-05 | 2021-06-04 | 南京理工大学 | Recycling method of fly ash and fly ash hydrothermal treatment fluid |
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| CN102641776B (en) | 2014-07-02 |
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