CN102198314B - Method for detoxifying and curing Cr(VI) by utilizing metakaolin-based geopolymer added with FeSO4.7H2O - Google Patents
Method for detoxifying and curing Cr(VI) by utilizing metakaolin-based geopolymer added with FeSO4.7H2O Download PDFInfo
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- CN102198314B CN102198314B CN2011101153617A CN201110115361A CN102198314B CN 102198314 B CN102198314 B CN 102198314B CN 2011101153617 A CN2011101153617 A CN 2011101153617A CN 201110115361 A CN201110115361 A CN 201110115361A CN 102198314 B CN102198314 B CN 102198314B
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- 238000000034 method Methods 0.000 title claims abstract description 59
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 title claims abstract description 32
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 title abstract description 6
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 title abstract 5
- 229920000876 geopolymer Polymers 0.000 title abstract 3
- 239000000243 solution Substances 0.000 claims abstract description 52
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 39
- 239000011259 mixed solution Substances 0.000 claims abstract description 32
- 238000003756 stirring Methods 0.000 claims abstract description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 42
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 34
- 239000011707 mineral Substances 0.000 claims description 34
- 229920000642 polymer Polymers 0.000 claims description 34
- 235000019353 potassium silicate Nutrition 0.000 claims description 19
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 19
- 239000007787 solid Substances 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 230000005284 excitation Effects 0.000 claims description 13
- 238000012423 maintenance Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 238000007711 solidification Methods 0.000 claims description 10
- 230000008023 solidification Effects 0.000 claims description 10
- 239000005995 Aluminium silicate Substances 0.000 claims description 2
- 235000012211 aluminium silicate Nutrition 0.000 claims description 2
- 238000001354 calcination Methods 0.000 claims description 2
- 239000011651 chromium Substances 0.000 abstract description 123
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 37
- 239000012190 activator Substances 0.000 abstract description 9
- 239000003513 alkali Substances 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract 1
- 235000010755 mineral Nutrition 0.000 description 32
- 238000002386 leaching Methods 0.000 description 12
- 230000006872 improvement Effects 0.000 description 9
- 239000002893 slag Substances 0.000 description 9
- 239000004698 Polyethylene Substances 0.000 description 8
- 239000004568 cement Substances 0.000 description 8
- -1 polyethylene Polymers 0.000 description 8
- 229920000573 polyethylene Polymers 0.000 description 8
- 238000007789 sealing Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 238000011953 bioanalysis Methods 0.000 description 3
- 230000000711 cancerogenic effect Effects 0.000 description 3
- 231100000315 carcinogenic Toxicity 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000003895 groundwater pollution Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001844 chromium Chemical class 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 240000003483 Leersia hexandra Species 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 208000031320 Teratogenesis Diseases 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- BCFSVSISUGYRMF-UHFFFAOYSA-N calcium;dioxido(dioxo)chromium;dihydrate Chemical compound O.O.[Ca+2].[O-][Cr]([O-])(=O)=O BCFSVSISUGYRMF-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052598 goethite Inorganic materials 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Substances [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 231100000004 severe toxicity Toxicity 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- PXLIDIMHPNPGMH-UHFFFAOYSA-N sodium chromate Chemical compound [Na+].[Na+].[O-][Cr]([O-])(=O)=O PXLIDIMHPNPGMH-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 231100000816 toxic dose Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- VOSQOLXQDQZVCL-UHFFFAOYSA-L zinc;chloride;hydroxide Chemical compound [OH-].[Cl-].[Zn+2] VOSQOLXQDQZVCL-UHFFFAOYSA-L 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a method for detoxifying and curing Cr(VI) by utilizing metakaolin-based geopolymer added with FeSO4.7H2O, which comprises the following steps of: 1) adding metakaolin into a solution of an alkali activator in batches, and uniformly stirring to obtain a mixed solution; 2) adding Cr(VI) and FeSO4.7H2O into the mixed solution which is obtained in the step 1) in turn and uniformly mixing, wherein the addition of the Cr(VI) is less than or equal to 0.8 percent of the mass of the mixed solution which is obtained in the step 1), the addition of the FeSO4.7H2O is less than or equal to 16 percent of the mass of the mixed solution which is obtained in the step 1), and the mass ratio of the FeSO4.7H2O to the Cr(VI) is more than or equal to 20; and 3) molding the solution obtained in the step 2), curing, demolding and maintaining in turn to obtain the geopolymer fixed with Cr. The method is environment-friendly, high in chromium curing rate and suitable for controlling acid-soluble Cr.
Description
Technical field
The invention belongs to the groundwater pollution control of Cr (VI), be specifically related to a kind of utilization and add FeSO
47H
2The metakaolin based mineral polymer detoxifcation of O and the method for solidifying Cr (VI).
Background technology
Chromic salts is the important chemical basic material.Chromium salt production is taked high-temperature roasting-water logging-multistage evaporation crystallization processes, and the chromium conversion ratio is 75%, and residue is discharged with the chromium slag.Every production 1 t sodium chromate product discharges 1.7～4.2 t high toxicity chromium slags approximately, and every production 1t crome metal discharges 7t chromium slag approximately.According to statistics, since fifties chromium salt production, China's more than 20 city accumulative total chromium slag muck is deposited 6,000,000 t, handles less than 2,000,000 t.The main chemical compositions of chromium slag is CaO, Fe
2O
3, MgO, SiO
2, Al
2O
3, Cr
2O
3, wherein the carcinogenic calcium chromate is about 1%～2%, water-soluble hypertoxic Cr VI about 0.5%～1%.Pollution of chromium is water-soluble hexavalent chromium polluted.Cr VI toxicity is very big, and serious harm skin, respiratory tract, alimentary canal and liver, kidney have carcinogenic, teratogenesis.Cr (VI) is 110 μ g/m to the minimal toxic dose of human body
3Therefore, water-solubility Cr (VI) is classified as one of 8 kinds of maximum chemical substances of human harm, is one of internationally recognized 3 kinds of carcinogenic metallic elements, also is one of 129 kinds of generally acknowledged priority pollutants of Environmental Protection Agency (EPA).A large amount of chromium slags are not stored up as if treated for a long time, and fine dusts can be dispersed with the wind, and surrounding environment and waters are polluted; Suffer sleet to soak pouring, Cr (VI) can infiltrate into underground rivers, lake and the underground water pollution of causing.
At present, varied to Cr (VI) groundwater pollution control.Specific as follows: 1) chemical method: as to be to adopt various chemical methodes to make the chromium deposition perhaps highly toxic Cr (VI) is reduced to the Cr of low toxicity
3+The former is like facture of reduction precipitation method, electrochemical process, nanometer iron and the Zero-valent Iron of Cr in the chromate waste water (VI) etc.The latter such as chromium slag high temperature reduction and detoxication, wet method detoxifcation and little disintoxication.2) physics method: mainly be through absorption or fixation of C r (VI), reach the detoxifcation purpose.The former is applicable to that mainly the Cr (VI) in the aqueous solution removes, and studies more.As with the Cr (VI) in the adsorption aqueous solutions such as active carbon, zeolite, goethite, coal, flyash, active coal gangue, wood chip, synthetic stratum water bovite and absorption Cr (VI) such as stratiform hydroxyl zinc chloride, alkali formula zinc nitrate and basic zinc sulfate have also obtained good effect.Solidification method is that Cr (VI) is fixed in other material, reduces the dissolution rate of Cr (VI).Early stage useful chromium slag is fired glazed, vitrified brick, preparation devitrified glass, is refined the research that contains chromium pig iron, can Cr (VI) is fixing, but the utilization of these method chromium slags is very low, therefore, can not be used for the pollution control of extensive Cr (VI).The method that adopts at present is mainly cement solidification method; Cement solidification method can be fixing with water miscible Cr (VI) through the method for in cement is made, adding blast-furnace cinder and other reducing agent; But also need take certain measure to solubility in acid Cr (VI), this is by the poor decision of cement self acid resistance.Also valuable mineral polymer research that Cr (VI) is cured in recent years, but poor.3) bioanalysis: chemical method and physics method all will be used a large amount of reducing agents or adsorbent, and can produce a large amount of residues or deposit buildup and need in time to handle, otherwise can be oxidized once more and contaminated environment.Therefore, more and more active with biological detoxifcation research to Cr (VI), as with microorganism and plant to the effects such as absorption, conversion, complexing, flocculation, deposition and enrichment of Cr, reach the purpose of removing Cr (VI).Bioanalysis has detoxifcation advantage such as thorough, economic, efficient.Patent " a kind of biological renovation method of chromium pollution water " (CN 101293710A) is set up surface current artificial wetland's device; Chromium enriching plant Li Shi standing grain (Leersia hexandra Swartz) is grown directly upon on the filler that chooses; The Cr (VI) in the water body is removed in effect through filler and plant; And effectively Cr (VI) is taken away through periodical reaping Li Shi standing grain aerial part, make filler keep the high processing effect.
Comprehensive above Cr (VI) groundwater pollution control, end is got up, and has two types: one type is disintoxication, one type is solidification method.Disintoxication can stay a large amount of residues and pile up, and like the absorption method in chemical method, the physics method, microwave method, bioanalysis etc., needs post processing, and untimely processing has once more hidden danger oxidized and the generation severe toxicity.Solidification method can be sealed in Cr in certain material, makes Cr be in a kind of environment of anaerobism, can remedy the deficiency of disintoxication.But the material that solidification method relates in the prior art is mainly cement and mineral polymer, and the limitation of cement self makes it be difficult to suppress the leaching of solubility in acid Cr (VI).And solidifying Cr (VI) with mineral polymer, available data does not also have efficient ways.
Summary of the invention
Technical problem to be solved by this invention is: to the deficiency that exists in the above-mentioned prior art, a kind of environmental protection, chromium curing degree height are provided and are applicable to the interpolation FeSO that controls solubility in acid Cr
47H
2The metakaolin based mineral polymer detoxifcation of O and the method for solidifying Cr (VI).
The present invention solves the problems of the technologies described above the technical scheme that is proposed to be:
FeSO is added in a kind of utilization
47H
2The metakaolin based mineral polymer detoxifcation of O and the method for solidifying Cr (VI) is characterized in that it comprises the steps:
1) the metakaolin gradation is added in the alkaline excitation agent solution, stirs, obtain mixed solution;
2) add Cr (VI) and FeSO more successively
47H
2O is to step 1) gained mixed solution and mix, and wherein, the addition of said Cr (VI) is smaller or equal to 0.8% of step 1) gained mixed solution quality, said FeSO
47H
2The addition of O is smaller or equal to step 1) gained mixed solution quality 16%, FeSO
47H
2The mass ratio of O and Cr (VI) is more than or equal to 20;
3) with step 2) solution that obtains goes into mould, curing, the demoulding and maintenance successively, obtains being fixed with the mineral polymer of Cr.
In the such scheme; Said alkaline excitation agent solution is the mixed solution of water glass solution and solid NaOH, and wherein, the modulus of water glass solution is 2.8; The solid content of water glass solution is 40%, said metakaolin, water glass solution, and the mass ratio of solid NaOH be 6:5:1.
In the such scheme, said metakaolin is made at 600 ℃ of calcining 4h by kaolin.
In the such scheme, solidification temperature is 60 ℃.
In the such scheme, curing temperature is 60 ℃, and curing time is 1h.
Principle of the present invention is: mineral polymer is amorphous network structure, its construction unit [AlO
4] electronegative, can combine positively charged metallic element.When mineral polymer in building-up process, add Cr (VI) and FeSO simultaneously
47H
2O, FeSO
47H
2O tool reproducibility can be with anionic form (Cr
2O
7 2-And CrO
4 2-) Cr (VI) that exists is reduced into the Cr of cationic form
3+, Cr then
3+With [AlO
4] combine, in the mineral polymer solidification process, be fixed.
Beneficial effect of the present invention is:
1, the present invention is matrix with the mineral polymer, adds FeSO
47H
2O is as reducing agent, can be disposable in the mineral polymer solidification process Cr (VI) be detoxified and fixing, and can not stay a large amount of residues and pile up, relatively environmental protection, and technological process is simple.
2, mineral polymer is an amorphous structure, and it is to the Cr after the detoxifcation
3+Chemisorbed, physics coating effect are not only arranged, also can generate Cr (OH)
3Deposition is coated again, and impalpable structure makes its fixing restriction that does not receive lattice to Cr, and curing degree is high and the curing amount is big.
3, mineral polymer is compared with the traditional cement firming body, acid resistance, good endurance, high temperature resistant, intensity is high, anti-permeability performance is good etc., can be widely used in cement, pottery, fire-resistant heat insulating material etc., non-secondary pollution.
The specific embodiment
Further illustrate content of the present invention below in conjunction with embodiment, but the present invention is not limited to following embodiment.Any change or improvement on basis of the present invention all belongs to protection scope of the present invention.
Embodiment 1
FeSO is added in a kind of utilization
47H
2The metakaolin based mineral polymer detoxifcation of O and the method for solidifying Cr (VI), it comprises the steps:
1) 5g solid NaOH is added in the 25g water glass solution, be made into alkali-activator solution; Afterwards the gradation of 30g metakaolin is added in the above-mentioned alkaline excitation agent solution, stir, obtain mixed solution;
2) add 0.042g K more successively
2Cr
2O
7With 0.6g FeSO
47H
2O and mixes to step 1) gained mixed solution;
3) with step 2) solution that obtains pours the mould of 20 * 20 * 20mm into, after 60 ℃ of curing, the demoulding, with the polyethylene film sealing, 60 ℃ of maintenance 1h obtain being fixed with the mineral polymer of Cr.
According to U.S. EPA-TCLP method the leaching concentration of total chromium is measured, concrete grammar is: the above-mentioned mineral polymer that is fixed with Cr that obtains is crushed to below the 9mm, and leaching liquid is the acetum of pH value 2.88, solid-to-liquid ratio 1:20, and concussion 18 ± 2h filters.Detect the content of total chromium in the filtrating with flame atomic absorption method.
Curing degree then calculates gained through following formula:
S=(m－C*V)/m
In the formula, S is a curing degree, and C is a filter liquor concentration, and V is a filtrate volume, and m is the addition of total Cr.
According to said method, the leaching concentration of total chromium of embodiment 1 gained is 0.12mg/L, and the curing degree of chromium is 99.02%, satisfies the improvement requirement of U.S. EPA-TCLP method to Cr (VI).
Need to prove that the leaching concentration of the resulting total chromium of following examples and the curing degree of chromium all with reference to the listed method of embodiment 1, repeat no more afterwards.
Embodiment 2
FeSO is added in a kind of utilization
47H
2The metakaolin based mineral polymer detoxifcation of O and the method for solidifying Cr (VI), it comprises the steps:
1) 5g solid NaOH is added in the 25g water glass solution, be made into alkali-activator solution; Afterwards the gradation of 30g metakaolin is added in the above-mentioned alkaline excitation agent solution, stir, obtain mixed solution;
2) add 0.0848g K more successively
2Cr
2O
7With 0.6g FeSO
47H
2O is to step 1) gained mixed solution and mix;
3) with step 2) solution that obtains pours the mould of 20 * 20 * 20mm into, after 60 ℃ of curing, the demoulding, with the polyethylene film sealing, 60 ℃ of maintenance 1h obtain being fixed with the mineral polymer of Cr.
The leaching concentration of total chromium of embodiment 2 gained is 0.17mg/L, and the curing degree of chromium is 99.30%, satisfies the improvement requirement of U.S. EPA-TCLP method to Cr (VI).
Embodiment 3
FeSO is added in a kind of utilization
47H
2The metakaolin based mineral polymer detoxifcation of O and the method for solidifying Cr (VI), it comprises the steps:
1) 5g solid NaOH is added in the 25g water glass solution, be made into alkali-activator solution; Afterwards the gradation of 30g metakaolin is added in the above-mentioned alkaline excitation agent solution, stir, obtain mixed solution;
2) add 0.170g K more successively
2Cr
2O
7With 1.2g FeSO
47H
2O is to step 1) gained mixed solution and mix;
3) with step 2) solution that obtains pours the mould of 20 * 20 * 20mm into, after 60 ℃ of curing, the demoulding, with the polyethylene film sealing, 60 ℃ of maintenance 1h obtain being fixed with the mineral polymer of Cr.
The leaching concentration of total chromium of embodiment 3 gained is 0.515mg/L, and the curing degree of chromium is 99%, satisfies the improvement requirement of U.S. EPA-TCLP method to Cr (VI).
Embodiment 4
FeSO is added in a kind of utilization
47H
2The metakaolin based mineral polymer detoxifcation of O and the method for solidifying Cr (VI), it comprises the steps:
1) 5g solid NaOH is added in the 25g water glass solution, be made into alkali-activator solution; Afterwards the gradation of 30g metakaolin is added in the above-mentioned alkaline excitation agent solution, stir, obtain mixed solution;
2) add 0.51g K more successively
2Cr
2O
7With 3.6g FeSO
47H
2O is to step 1) gained mixed solution and mix;
3) with step 2) solution that obtains pours the mould of 20 * 20 * 20mm into, after 60 ℃ of curing, the demoulding, with the polyethylene film sealing, 60 ℃ of maintenance 1h obtain being fixed with the mineral polymer of Cr.
The leaching concentration of total chromium of embodiment 4 gained is 0.023mg/L, and the curing degree of chromium is 99.98%, satisfies the improvement requirement of U.S. EPA-TCLP method to Cr (VI).
Embodiment 5
FeSO is added in a kind of utilization
47H
2The metakaolin based mineral polymer detoxifcation of O and the method for solidifying Cr (VI), it comprises the steps:
1) 5g solid NaOH is added in the 25g water glass solution, be made into alkali-activator solution; Afterwards the gradation of 30g metakaolin is added in the above-mentioned alkaline excitation agent solution, stir, obtain mixed solution;
2) add 0.679g K more successively
2Cr
2O
7With 4.8g FeSO
47H
2O is to step 1) gained mixed solution and mix;
3) with step 2) solution that obtains pours the mould of 20 * 20 * 20mm into, after 60 ℃ of curing, the demoulding, with the polyethylene film sealing, 60 ℃ of maintenance 1h obtain being fixed with the mineral polymer of Cr.
The leaching concentration of total chromium of embodiment 5 gained is 0.47mg/L, and the curing degree of chromium is 99.81%, satisfies the improvement requirement of U.S. EPA-TCLP method to Cr (VI).
Embodiment 6
FeSO is added in a kind of utilization
47H
2The metakaolin based mineral polymer detoxifcation of O and the method for solidifying Cr (VI), it comprises the steps:
1) 5g solid NaOH is added in the 25g water glass solution, be made into alkali-activator solution; Afterwards the gradation of 30g metakaolin is added in the above-mentioned alkaline excitation agent solution, stir, obtain mixed solution;
2) add 0.848g K more successively
2Cr
2O
7With 6g FeSO
47H
2O is to step 1) gained mixed solution and mix;
3) with step 2) solution that obtains pours the mould of 20 * 20 * 20mm into, after 60 ℃ of curing, the demoulding, with the polyethylene film sealing, 60 ℃ of maintenance 1h obtain being fixed with the mineral polymer of Cr.
The leaching concentration of total chromium of embodiment 6 gained is 0.049 mg/L, and the curing degree of chromium is 99.98%, satisfies the improvement requirement of U.S. EPA-TCLP method to Cr (VI).
Embodiment 7
FeSO is added in a kind of utilization
47H
2The metakaolin based mineral polymer detoxifcation of O and the method for solidifying Cr (VI), it comprises the steps:
1) 5g solid NaOH is added in the 25g water glass solution, be made into alkali-activator solution; Afterwards the gradation of 30g metakaolin is added in the above-mentioned alkaline excitation agent solution, stir, obtain mixed solution;
2) add 1.187g K more successively
2Cr
2O
7With 8.4g FeSO
47H
2O is to step 1) gained mixed solution and mix;
3) with step 2) solution that obtains pours the mould of 20 * 20 * 20mm into, after 60 ℃ of curing, the demoulding, with the polyethylene film sealing, 60 ℃ of maintenance 1h obtain being fixed with the mineral polymer of Cr.
The leaching concentration of total chromium of embodiment 7 gained is 0.56 mg/L, and the curing degree of chromium is 99.60%, satisfies the improvement requirement of U.S. EPA-TCLP method to Cr (VI).
Embodiment 8
FeSO is added in a kind of utilization
47H
2The metakaolin based mineral polymer detoxifcation of O and the method for solidifying Cr (VI), it comprises the steps:
1) 5g solid NaOH is added in the 25g water glass solution, be made into alkali-activator solution; Afterwards the gradation of 30g metakaolin is added in the above-mentioned alkaline excitation agent solution, stir, obtain mixed solution;
2) add 1.357g K more successively
2Cr
2O
7With 9.6g FeSO
47H
2O is to step 1) gained mixed solution and mix;
3) with step 2) solution that obtains pours the mould of 20 * 20 * 20mm into, after 60 ℃ of curing, the demoulding, with the polyethylene film sealing, 60 ℃ of maintenance 1h obtain being fixed with the mineral polymer of Cr.
The leaching concentration of total chromium of embodiment 8 gained is 0.034 mg/L, and the curing degree of chromium is 99.99%, satisfies the improvement requirement of U.S. EPA-TCLP method to Cr (VI).
It is understandable that the alkaline excitation agent solution in the foregoing description also is confined to the mixed solution of solid NaOH and water glass solution, can also be KOH, NaOH, Na
2SiO
3, K
2SiO
3In the mixed solution of one or more materials.In the foregoing description, the modulus of water glass solution is 2.8, and the solid content of water glass solution is 40%.In addition, K
2Cr
2O
7And FeSO
47H
2The addition of O is all greater than 0.
Claims (5)
1. one kind is utilized interpolation FeSO
47H
2The metakaolin based mineral polymer detoxifcation of O and the method for solidifying Cr (VI) is characterized in that it comprises the steps:
1) the metakaolin gradation is added in the alkaline excitation agent solution, stirs, obtain mixed solution;
2) add Cr (VI) and FeSO more successively
47H
2O is to step 1) gained mixed solution and mix, and wherein, the addition of said Cr (VI) is smaller or equal to 0.8% of step 1) gained mixed solution quality, said FeSO
47H
2The addition of O is smaller or equal to 16% of step 1) gained mixed solution quality, FeSO
47H
2The mass ratio of O and Cr (VI) is more than or equal to 20;
3) with step 2) solution that obtains goes into mould, curing, the demoulding and maintenance successively, obtains being fixed with the mineral polymer of Cr.
2. detoxifcation as claimed in claim 1 and the method for solidifying Cr (VI); It is characterized in that; Said alkaline excitation agent solution is the mixed solution of water glass solution and solid NaOH, and wherein, the modulus of water glass solution is 2.8; The solid content of water glass solution is 40%, said metakaolin, water glass solution, and the mass ratio of solid NaOH be 6:5:1.
3. detoxifcation as claimed in claim 1 and the method for solidifying Cr (VI) is characterized in that, said metakaolin is made at 600 ℃ of calcining 4h by kaolin.
4. detoxifcation as claimed in claim 1 and the method for solidifying Cr (VI) is characterized in that solidification temperature is 60 ℃.
5. detoxifcation as claimed in claim 1 and the method for solidifying Cr (VI) is characterized in that curing temperature is 60 ℃, and curing time is 1h.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101069773A (en) * | 2007-03-15 | 2007-11-14 | 李兴 | Bundle-kiln dry-method chromium residue detoxining technology |
| CN101306862A (en) * | 2008-07-01 | 2008-11-19 | 浙江大学 | Method for preparing nano-level Fe<0>/Fe3O4 and uses thereof |
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2011
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101069773A (en) * | 2007-03-15 | 2007-11-14 | 李兴 | Bundle-kiln dry-method chromium residue detoxining technology |
| CN101306862A (en) * | 2008-07-01 | 2008-11-19 | 浙江大学 | Method for preparing nano-level Fe<0>/Fe3O4 and uses thereof |
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