CN114890768A - Iron tailing road base material, preparation method and application thereof - Google Patents
Iron tailing road base material, preparation method and application thereof Download PDFInfo
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- CN114890768A CN114890768A CN202210643874.3A CN202210643874A CN114890768A CN 114890768 A CN114890768 A CN 114890768A CN 202210643874 A CN202210643874 A CN 202210643874A CN 114890768 A CN114890768 A CN 114890768A
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- base material
- iron
- road base
- parts
- salt
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 202
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 101
- 239000000463 material Substances 0.000 title claims abstract description 80
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000010881 fly ash Substances 0.000 claims abstract description 27
- 239000000292 calcium oxide Substances 0.000 claims abstract description 22
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 22
- 159000000003 magnesium salts Chemical class 0.000 claims abstract description 17
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 16
- 229920000642 polymer Polymers 0.000 claims abstract description 16
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000002585 base Substances 0.000 claims description 46
- 238000003756 stirring Methods 0.000 claims description 33
- 239000000243 solution Substances 0.000 claims description 31
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 18
- 238000012360 testing method Methods 0.000 claims description 12
- 239000002956 ash Substances 0.000 claims description 11
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 10
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 10
- 239000001110 calcium chloride Substances 0.000 claims description 10
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 10
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 9
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 9
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 6
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 6
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 4
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 3
- 239000000084 colloidal system Substances 0.000 claims description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 3
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 3
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 2
- 239000001099 ammonium carbonate Substances 0.000 claims description 2
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 2
- 238000005056 compaction Methods 0.000 claims description 2
- 229920002521 macromolecule Polymers 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims 1
- 239000008236 heating water Substances 0.000 claims 1
- 230000001376 precipitating effect Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 12
- 239000004576 sand Substances 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 239000004575 stone Substances 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 abstract 1
- 238000009991 scouring Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 20
- 150000002500 ions Chemical class 0.000 description 16
- 229910001385 heavy metal Inorganic materials 0.000 description 12
- 229920002401 polyacrylamide Polymers 0.000 description 12
- 238000007654 immersion Methods 0.000 description 11
- 238000004090 dissolution Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000000087 stabilizing effect Effects 0.000 description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 6
- 235000011941 Tilia x europaea Nutrition 0.000 description 6
- 125000003368 amide group Chemical group 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 6
- 239000000920 calcium hydroxide Substances 0.000 description 6
- 235000011116 calcium hydroxide Nutrition 0.000 description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 6
- 239000004568 cement Substances 0.000 description 6
- 239000004571 lime Substances 0.000 description 6
- -1 polypropylene Polymers 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000004927 clay Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 239000010426 asphalt Substances 0.000 description 3
- 229910001570 bauxite Inorganic materials 0.000 description 3
- 150000001768 cations Chemical class 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000012190 activator Substances 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical group [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000003583 soil stabilizing agent Substances 0.000 description 2
- 239000010754 BS 2869 Class F Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000009666 routine test Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/18—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mixtures of the silica-lime type
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses an iron tailing road base material, a preparation method and application thereof. The iron tailing road base material comprises the following components in parts by weight: 0.05-0.3 part of modified high-molecular polymer, 5-10 parts of quick lime, 10-20 parts of fly ash, 0.5-1 part of aluminum salt, 0.02-0.1 part of magnesium salt, 0.02-0.05 part of calcium salt, 12-15 parts of water and 100 parts of iron tailings. The iron tailing roadbed material prepared by the invention has high compressive strength after being cured, has better water stability and scouring resistance, and can be used as a subbase of a road; the problem of difficult construction when the iron tailings are used as a road base material is solved; effectively solves the problem of shortage of sand and stone materials in the road paving process, reduces the accumulation of tailings, improves the ecological environment and has good economic and social benefits.
Description
Technical Field
The invention relates to the technical field of solid waste treatment, in particular to an iron tailing road base material, a preparation method and application thereof.
Background
The iron tailings are massive or powdery solid wastes formed after the mining and separation of iron ores, contain a certain amount of useful metals and minerals, and have the characteristics of fine granularity, large quantity, high recycling cost and the like. Tailings are generally discharged into a tailing pond through a pipeline in a slurry form and are stacked, and a potential geological disaster source is formed by long-term stacking, so that the life and property safety of people is threatened; after heavy metal ions in the tailings are dissolved out, underground water is easily polluted, and the ecological environment is destroyed; random dumping of tailings also causes waste of renewable resources.
On the other hand, with the implementation of the strategy of the strong traffic country, the number of newly built, changed and expanded highways in China is increasing, and the sandstone resources as important building materials face the situation of increasing shortage and even exhaustion. The concept of green sustainable development is also opposite to the mass exploitation of ore resources, so that iron tailings as a sandstone substitute have attracted attention and attention of many scholars. According to incomplete statistics, 8000 large-scale mines are available in China at present, more than 11 ten thousand rural collective mines are available in China, tailings generated by mining industry reach more than 100 hundred million tons, and the tailings are increased year by year, wherein iron tailings account for 1/3 of the total tailings. But the utilization rate of the tailings in China is only 7 percent at present.
The prior patented technology for preparing a pavement base filler or (base) base course by using iron tailings generally focuses on the following aspects:
1. the iron tailings are solidified by using a bio-enzyme soil stabilizer, for example, patent CN 104152148A provides a method for preparing a pavement base material by using a novel soil stabilizer to stabilize the iron tailings, the pavement base material is prepared by using Thailand bio-enzyme, cement, broken stone, iron tailings, polypropylene fiber and the like, but strong corrosive reagents such as sulfuric acid and the like are required in the preparation process, and construction is not required; the curing agent is acidic, which is not beneficial to the strength increase of the cement-based material;
2. the iron tailings are solidified using alkali-activated materials, e.g. patent CN 104844023a provides a method for making mine packing material by solidifying copper tailings using iron tailings, by using Na 2 CO 3 KOH is used as an activator to excite calcined bauxite to generate strength, and the calcined bauxite is used as a mine filling material after being solidified, but the bauxite needs to be calcined at high temperature in the preparation process, and tailings need to be mechanically ground, so that the production cost is increased; the alkali activator KOH is strong alkali, so that potential safety hazards exist in construction;
3. mixing with partial clay, adding inorganic binder stabilizing material, and solidifying, for example, patent CN 108560347A provides a roadbed filler construction method using iron tailings powder as main material, mixing iron tailings powder with clay uniformly, and mixing with hydrated lime to form roadbed filler. However, the clay components in different regions have larger differences, and particularly the clay with larger plasticity index and the iron tailing powder have larger difficulty in combined construction; and the problem of the dissolution of harmful ions in the iron tailings is not further treated.
Therefore, the prior art does not provide a base material of the iron tailings road, which solves the construction difficulty, improves the roadbed strength and reduces the dissolution of harmful ions.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an iron tailing road base material, a preparation method and application thereof. The invention can replace inorganic binder stabilizing materials to be used as a road (bottom) base course, the technical index of the invention meets the requirements of JTG D50-2017 'design Specification for asphalt road surface on roads', the environmental problem caused by sand and stone materials in the road engineering construction process is relieved, and the social and economic benefits are remarkable.
In order to achieve the purpose, the invention is realized by the following technical scheme:
an iron tailing road base material comprises the following components: modified high molecular polymer, quicklime, fly ash, magnesium salt, calcium salt, water and iron tailings.
Further, the components in parts by weight are as follows: 0.05-0.3 part of modified high-molecular polymer, 5-10 parts of quick lime, 10-20 parts of fly ash, 0.02-0.1 part of magnesium salt, 0.02-0.05 part of calcium salt, 12-15 parts of water and 100 parts of iron tailings.
Preferably, the iron tailing road base material further comprises aluminum salt.
Further, the aluminum salt is 0.5-1 part by weight.
Optionally, the modified high molecular polymer is inorganic-organic hybrid aluminum hydroxide-polyacrylamide (Al-PAM). Al-PAM is Al (OH) 3 The PAM macromolecule is a star-shaped structure with a branched chain as a core. The method mainly has the following functions: 1. the star-shaped structure of the Al-PAM is beneficial to the full distribution of PAM branched chains and iron tailing particlesThe contact and adsorption play a role in bridging the polymer chains, so that the overall strength of the roadbed material is improved; 2. the amido bond on the Al-PAM can generate a cross-linking reaction with aluminum ions in the aluminum hydroxide, so that the strength of the iron tailing solidified body is improved, and meanwhile, the amido group at the hydrophilic end is consumed, so that the water erosion resistance of the iron tailing solidified body is improved; 3. meanwhile, the polyacrylamide has a longer C-C main chain, the polarity of an amide group on a branched chain is higher, the polyacrylamide has good hydrophilicity and water solubility, and is easy to form a hydrogen bond with a group in the iron tailings to generate a strong adsorption effect, so that the van der Waals force and the electrostatic attraction between the tailing particles are enhanced, and the overall strength is improved; 4. the star-shaped hybrid structure of the Al-PAM improves the adsorption capacity of heavy metal ions, reduces the dissolution of the heavy metal ions in the iron tailings and is beneficial to protecting the ecological environment.
The main component of the quicklime is calcium oxide, and the grade is grade III or above. Calcium oxide reacts with water at the early stage to generate calcium hydroxide which is filled in tailing particles, so that the calcium hydroxide plays a role in binding to improve the early strength; in addition, the product calcium hydroxide has a pH adjusting effect on the iron tailing material, so that the amide group of the modified high-molecular polymer is hydrolyzed in an alkaline environment, and the generated ammonium ions can reduce the double electric layer structure of the iron tailing, thereby improving the water stability of the iron tailing roadbed material.
Optionally, the fly ash is class C or class F fly ash, and the grade is second grade ash and above. The fly ash and calcium hydroxide slowly undergo a volcanic ash reaction to generate hydrated calcium silicate gel (C-S-H) and hydrated calcium aluminate (C) 3 AH 6 ) The reaction time lasts for more than several years, and the late-stage strength of the solidified iron tailing roadbed material can be continuously improved.
Optionally, the aluminum salt is one or more of aluminum sulfate, aluminum chloride and aluminum nitrate. The aluminum salt mainly has the following two functions: 1. the aluminum ions can be crosslinked with amido bonds in the Al-PAM to form a network structure, and the surrounding particles are crosslinked to improve the strength of the iron tailing roadbed; 2. the aluminum ions participate in the volcanic ash reaction between the quick lime and the fly ash to generate a product C-A-S-H gel, so that the roadbed strength of the iron tailings is improved.
Optionally, the plasticity index of the iron tailings is 12-16, and the optimal water content determined by a compaction test is 10-18%. The iron tailings are not only used as a filler to provide strength in a roadbed material, but also have hydration products such as calcium silicate, calcium aluminate and the like generated by reacting a small amount of active silicon dioxide and aluminum oxide with calcium hydroxide, so that the early strength of the tailings material is improved; meanwhile, because the iron tailings contain the extra fine powder with larger mesh number, micro-gaps in the tailing materials can be filled to a certain extent, and the improvement of the water stability of the tailing materials is facilitated.
Optionally, the magnesium salt is one or more of magnesium chloride, magnesium nitrate and magnesium sulfate. Due to the fact that the polyacrylamide has large molecular weight and large viscosity of an aqueous solution, after Al-PAM is formed through inorganic-organic modification, the viscosity of a star-shaped structure of the polyacrylamide is further increased, and construction difficulty is increased. As the magnesium salt can weaken the repulsion among polymer molecules after being added into the solution, the arrangement structure of the molecules is changed, and the viscosity of the Al-PAM is reduced. When the Al-PAM is mixed with other materials, anions such as carboxylate radicals generated by the hydrolysis of the branched PAM can be physically glued with cations, so that the strength is improved.
Optionally, the calcium salt is one or more of calcium chloride, calcium sulfate and calcium nitrate. Due to the addition of calcium ions, different types of cations in the solution are increased, negative charges on a molecular chain and positive charges in the solution are neutralized, the spreading capacity of ions in water and the molecular chain in the Al-PAM is increased, the probability of winding between the chains is reduced, and the viscosity of the Al-PAM solution is reduced; meanwhile, the addition of calcium ions is beneficial to the volcanic ash reaction between the lime and the fly ash to generate C-S-H gel.
The invention also provides a preparation method of the iron tailing roadbed material, which comprises the following steps:
1) and heating the water for mixing to 30-50 ℃, adding the modified high molecular polymer, and stirring for 10-30 minutes to obtain a solution A.
2) Adding magnesium salt and calcium salt into the solution A, and continuously stirring for 5-15 minutes to obtain a solution B. Divalent cations are added to neutralize negative charges on the molecular chains, and the repulsive force between ions and the molecular chains in water is increased, so that the probability of mutual twisting among the molecular chains is reduced, the viscosity of the mixture is reduced, and the mixture is more beneficial to being uniformly stirred with other mixtures.
3) And uniformly stirring the iron tailing sand, the quicklime, the fly ash and the aluminum salt, adding the solution B, and then continuously stirring for 1.5-5 minutes to obtain the solidified iron tailing roadbed material.
The stirring temperature of the step 1) and the step 2) is 30-50 ℃; the stirring speed is 200-800 r/min. At this temperature, hydrogen bond association between Al-PAM is avoided; and under the shearing action, the amide group can act with water molecules more, so that the solution viscosity is reduced, and Al-PAM in the solution is dissolved better.
The stirring temperature in the step 3) is 15-50 ℃, and the stirring speed is 25-90 r/min.
Finally, the invention provides an application of the iron tailing road base material in road engineering;
preferably, the iron tailing base layer material is used for roadbed construction.
The action mechanism of the iron tailing roadbed material is mainly shown as follows: 1. the Al-PAM is used, so that the amido bond can perform a cross-linking reaction with the doped aluminum salt to form a net structure, the strength is improved, the star-shaped structure of the Al-PAM improves the adsorption capacity of heavy metal ions, and the dissolution of the heavy metal ions is reduced; 2. the lime and the fly ash can continuously improve the roadbed strength and provide an alkaline environment, the amide group of the Al-PAM is hydrolyzed in the alkaline environment, and the generated ammonium ions can reduce the double electric layer structure of the iron tailings, so that the water stability of the iron tailing roadbed material is improved; 3. the addition of magnesium salt and calcium salt reduces the viscosity of Al-PAM and reduces the construction difficulty; 4. the reasonable adding mode can ensure that all components are uniformly mixed.
Compared with the prior art, the invention has the following beneficial effects:
1. the magnesium salt and the calcium salt in the iron tailing road base material provided by the invention effectively reduce the viscosity of the iron tailing base material and reduce the construction difficulty;
2. the unconfined compressive strength of the iron tailing road base material in 7 days can reach 2.22MPa, and the design requirement that the strength is more than 1.1MPa when a two-ash stable material is used as a road base layer specified in JTG D50-2017 road asphalt pavement design specifications is met;
3. the iron tailing roadbed material provided by the invention utilizes the modified high molecular polymer, and the long-term hydration product of the secondary ash can continuously improve the strength of the roadbed material and can solidify heavy metal ions in the tailing material; the hydrophilic group of the modified high molecular polymer is partially consumed, the water stability is improved, and the negative charge group of the modified high molecular polymer forms a chelate with heavy metal ions to reduce the dissolution of the heavy metal ions.
Drawings
FIG. 1 is a photograph of example 3 before immersion in water;
FIG. 2 is a photograph of example 3 after immersion in water;
FIG. 3 is a photograph of comparative example 6 before immersion in water;
FIG. 4 is a photograph of comparative example 6 after immersion in water;
FIG. 5 is a photograph of comparative example 7 before immersion in water;
fig. 6 is a photograph of comparative example 7 after immersion in water.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
In the embodiment, iron tailings in Lexi city are selected and sealed after field collection. The iron tailings have a plasticizing index of 15.6 and an optimal water content of 11.58%.
In the following examples, fly ash is secondary ash produced by suburb thermal power plants in the south of china; the lime is grade III lime produced by Jinan Baode metallurgy limestone GmbH, and the aluminum salt, the magnesium salt and the calcium salt are all purchased from national medicine group chemical reagent GmbH and are of analytical purity grade.
The experimental procedure was carried out according to the test protocol for inorganic binder stabilizing materials for road engineering (JTG E51-2009). The following strengths are all seven-day unconfined compressive strengths, and the water stability index is expressed in terms of the immersion strength/non-immersion strength. The soaking strength is that the test piece is put into a standard curing box for curing for 6 days, and the last 1 day is soaking curing; the water-free strength is standard curing room curing for 7 days.
The heavy metal ion dissolution is carried out according to Leaching in Cement mortar (GB/T30810-.
Example 1
The iron tailing road base material comprises, by weight, 0.05 part of Al-PAM, 5 parts of quicklime, 10 parts of fly ash, 0.5 part of aluminum sulfate, 0.02 part of magnesium chloride, 0.02 part of calcium chloride, 12 parts of water and 100 parts of iron tailings, and the weight parts of the components are shown in Table 1.
The preparation method of the iron tailing road base material comprises the following specific steps:
1) heating 120mL of mixing water to 40 ℃, adding 0.5g of Al-PAM, and stirring for 20 minutes to obtain a solution A;
2) adding 0.02g of magnesium chloride and 0.02g of calcium chloride into the solution A, and continuously stirring for 10 minutes to obtain a solution B;
3) and (3) uniformly stirring 1000g of iron tailing sand, 50g of quicklime, 100g of fly ash and 5g of aluminum sulfate, adding the solution B, and continuing stirring for 5 minutes to obtain the solidified iron tailing roadbed material.
The stirring temperature in the step 1) and the step 2) is 40 ℃, and the stirring speed is 500 r/min;
and 3) stirring at 25 ℃ and at a stirring speed of 50 r/min.
The preparation method of the modified high molecular polymer Al-PAM comprises the following steps:
after stirring strongly at room temperature, 110ml of a 15 wt% aqueous solution of ammonium carbonate was slowly dropped into 190ml of an 8 wt% aqueous solution of aluminum chloride to obtain Al (OH) 3 A colloidal solution. 4.5g acrylamide was dissolved in 25.5g Al (OH) 3 To the colloidal solution, 0.3g of 0.075% by weight NaHSO was added 3 And 0.15 wt% (NH) 4 ) 2 S 2 O 8 The solution was added to the flask under nitrogen. Then bakingSealing the bottle, and reacting at 40 ℃ for 8 hours to obtain the Al-PAM. The Al-PAM gel formed is dissolved in water, precipitated and extracted with acetone to remove Al (OH) 3 Colloid and acrylamide, then dried in a constant weight vacuum oven at 60 ℃. (see W.Y Yang and J.W Qian and Z.Q Shen.A novel fluidic of Al (OH) 3 –polyacrylamide ionic hybrid.[J]Journal of Colloid and Interface Science,273(2004)400-405)
The specific test results are shown in Table 2.
Example 2
The iron tailing road base material comprises, by weight, 0.3 part of Al-PAM, 10 parts of quicklime, 20 parts of fly ash, 1 part of aluminum chloride, 0.1 part of magnesium nitrate, 0.05 part of calcium sulfate, 15 parts of water and 100 parts of iron tailings.
The specific preparation method is the same as that of example 1.
Example 3
The iron tailing road base material consists of Al-PAM 0.3 weight portions, lime 6 weight portions, flyash 12 weight portions, aluminum sulfate 0.6 weight portions, magnesium chloride 0.05 weight portions, calcium chloride 0.03 weight portions, water 13.5 weight portions and iron tailing 100% weight portions.
The specific preparation method is the same as that of example 1.
Example 4
The iron tailing road base material comprises, by weight, 0.2 part of Al-PAM, 8 parts of quicklime, 15 parts of fly ash, 0.6 part of aluminum nitrate, 0.05 part of magnesium sulfate, 0.03 part of calcium nitrate, 13 parts of water and 100 parts of iron tailings.
The specific preparation method is the same as that of example 1.
Example 5
In the implementation, in order to clarify the effect of aluminum salt, the iron tailing road base material comprises the following components, by weight, 0.3 part of Al-PAM, 6 parts of quicklime, 12 parts of fly ash, 0.05 part of magnesium chloride, 0.03 part of calcium chloride, 13.7 parts of water and 100 parts of iron tailings.
The specific preparation method is the same as that of example 1.
Comparative example 1
In the implementation, in order to compare with the traditional cement stabilizing materials, common portland cement is used as an inorganic curing agent and added into the iron tailings in a certain proportion, test pieces are prepared according to the routine test rules of inorganic binder stabilizing materials for highway engineering (JTGE51-2009), and the seven-day unconfined compressive strength and water stability indexes of the solidified soil are respectively measured.
The iron tailing road base material consists of cement 10 weight portions, water 13 weight portions and iron tailing 100 weight portions.
The specific preparation method is the same as that of example 1.
Comparative example 2
In the implementation, in order to compare with the traditional 'second-ash' stabilizing materials, lime and fly ash are used as inorganic materials, test pieces are prepared according to the 'test procedure for inorganic binder stabilizing materials for highway engineering' (JTGE51-2009) according to the conventional method, and the seven-day unconfined compressive strength and water stability indexes of the solidified soil are respectively measured.
The iron tailing road base material consists of the following components, by weight, 6 parts of quicklime, 12 parts of fly ash, 13 parts of water and 100 parts of iron tailings.
The specific preparation method is the same as that of example 1.
Comparative example 3
In the implementation, in order to clarify the effect of the modified inorganic-organic Al-PAM, the iron tailing road base material comprises the following components, by weight, 6 parts of quicklime, 12 parts of fly ash, 0.6 part of aluminum sulfate, 0.05 part of magnesium chloride, 0.03 part of calcium chloride, 13.5 parts of water and 100 parts of iron tailings.
The specific preparation method is the same as that of example 1.
Comparative example 4
In the implementation, in order to clearly distinguish the modified inorganic-organic Al-PAM from the common Polyacrylamide (PAM), the iron tailing road base material is composed of the following components, by weight, 6 parts of quicklime, 12 parts of fly ash, 0.3 part of PAM, 0.6 part of aluminum sulfate, 0.05 part of magnesium chloride, 0.03 part of calcium chloride, 13.8 parts of water and 100 parts of iron tailings.
The specific preparation method is the same as that of example 1.
Comparative example 5
In the implementation, in order to clarify the effect of the magnesium salt, the iron tailing road base material comprises the following components, by weight, 0.3 part of Al-PAM, 6 parts of quick lime, 12 parts of fly ash, 0.03 part of calcium chloride, 0.6 part of aluminum sulfate, 13.5 parts of water and 100 parts of iron tailings.
The specific preparation method is the same as that of example 1.
Comparative example 6
In the implementation, in order to clarify the effect of calcium chloride, the iron tailing road base material comprises the following components, by weight, 0.3 part of Al-PAM, 6 parts of quick lime, 12 parts of fly ash, 0.05 part of magnesium chloride, 0.6 part of aluminum sulfate, 13.5 parts of water and 100 parts of iron tailings.
The specific preparation method is the same as that of example 1.
Comparative example 7
In this embodiment, to clarify the effect of the solution B, a material for a road base layer of iron tailings, the ratio of each material was the same as in example 3. Unlike example 3, step 1 and step 2 were omitted, and the materials were mixed in the same manner as in step 3 to prepare test pieces.
Comparative example 8
In the implementation, in order to clarify the influence of the stirring temperature and the stirring speed, the iron tailing road base material is planted, and the proportion of each material is the same as that in the embodiment 3. Different from the example 3, the stirring temperature of the step 1 and the step 2 is 25 ℃ at room temperature, and the stirring speed is 150 r/min.
TABLE 1 weight ratio of examples to comparative examples
TABLE 2 results of the experiment
The unconfined compressive strengths of the 7 days in the embodiments 1-3 are all larger than 1.1Mpa, so that the strength requirement that the strength is not smaller than 1.1Mpa when the two-ash stabilized soil is used as a base layer in the design Specification for road asphalt pavements JTG D50-2017 is met, and the strength index requirement cannot be met when only the two-ash solidified iron tailings (comparative example 2) are used. Comparative example 1 (Cement curing) the strength index does not meet the requirement of 3-5MPa for strength of the cement stabilized soil as a base course required in the specification.
Compared with example 3, in example 5, although the strength is obviously reduced, the viscosity is also obviously reduced, and the construction difficulty is greatly reduced. Example 5 demonstrates that the presence of aluminum salt can form a network structure with amide bonds of Al-PAM, which facilitates strength growth and cementation of heavy metal ions.
Compared with the examples, the heavy metal ion dissolution content of the comparative examples 3 and 4 is obviously increased, which shows that the modified Al-PAM star-shaped structure can better reduce the dissolution of the heavy metal ions and improve the strength and the water stability of the test piece.
Comparative examples 5 and 6 show that the addition of magnesium salt and calcium salt can improve the strength and water stability of the test piece. The reason is that the addition of the magnesium salt and the calcium salt can lead the Al-PAM to be better dissolved in water, the viscosity is reduced, other mixed materials can be more easily and uniformly mixed, and the Al-PAM can obviously agglomerate and the viscosity is increased in the stirring process without the addition of the magnesium salt and the calcium salt. Comparative example 6 before and after immersion in water, see fig. 3 and 4 in detail, and it can be seen that cracks appear on the surface of the test piece without the calcium salt before immersion in water, and the cracks are more obvious after immersion in water.
In comparative example 7, the test piece was cracked and cracked after being soaked in water for 1 day without the preparation process of the solution B, the surface crack was obvious, and the strength after soaking in water could not be tested. See figures 5 and 6 for details.
In the comparative example 8, the stirring temperature and the stirring speed in the preparation of the solution a and the solution B were changed, and the viscosity of the prepared solution B was significantly increased, which indicates that hydrogen bond association between Al-PAM was avoided at the stirring temperature of the present application; and under the stirring speed of the application, the shearing action enables the amide group to act with water molecules more, so that the solution viscosity is reduced, and Al-PAM in the solution is dissolved better.
It is to be understood that the foregoing is illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. The iron tailing road base material is characterized by comprising a modified high-molecular polymer, quicklime, fly ash, magnesium salt, calcium salt, water and iron tailings;
the modified high molecular polymer is Al-PAM;
the Al-PAM is Al (OH) 3 The molecule is a core, and the PAM macromolecule is a star-shaped structure with branched chains.
2. The iron tailing road base material according to claim 1, which is characterized by comprising the following components in parts by weight:
0.05-0.3 part of modified high-molecular polymer, 5-10 parts of quick lime, 10-20 parts of fly ash, 0.02-0.1 part of magnesium salt, 0.02-0.05 part of calcium salt, 12-15 parts of water and 100 parts of iron tailings.
3. The iron tailings road base material of claim 1 further comprising an aluminum salt.
4. The iron tailing road base material according to claim 3, wherein the aluminum salt is 0.5-1 part by weight.
5. The iron tailing road base material according to claim 1, wherein the plasticity index of the iron tailings is 12-16, and the optimal water content determined by a compaction test is 8-18%.
6. The iron tailing road base material according to claim 1, wherein the quicklime grade is grade iii or higher;
the grade of the fly ash is national standard grade II ash and above.
7. The iron tailing road base material according to claim 3, wherein the aluminum salt is one or more of aluminum sulfate, aluminum chloride and aluminum nitrate;
the magnesium salt is one or more of magnesium chloride, magnesium nitrate and magnesium sulfate;
the calcium salt is one or more of calcium chloride, calcium nitrate and calcium sulfate.
8. The iron tailing road base material according to claim 1, wherein the Al-PAM is prepared by the following method:
a. adding aqueous solution of ammonium carbonate into aqueous solution of aluminum chloride to obtain Al (OH) 3 A colloidal solution;
b. dissolving acrylamide in Al (OH) 3 Adding NaHSO into the colloidal solution 3 And (NH) 4 ) 2 S 2 O 8 Adding the solution into a flask under the condition of nitrogen;
c. sealing the flask in the step b, and reacting to obtain Al-PAM;
d. dissolving the formed Al-PAM gel in water, precipitating, extracting with acetone to remove Al (OH) 3 Colloid and acrylamide, and drying.
9. The preparation method of the iron tailing road base material of claim 4 is characterized by comprising the following preparation steps:
1) heating water for mixing to 30-50 ℃, adding the modified high-molecular polymer, and stirring for 10-30 minutes to obtain a solution A;
2) adding magnesium salt and calcium salt into the solution A, and continuously stirring for 5-15 minutes to obtain a solution B;
3) uniformly stirring the iron tailings, the quicklime, the fly ash and the aluminum salt, adding the solution B, and then continuously stirring for 1.5-5 minutes to obtain an iron tailing road base material;
the stirring temperature in the step 1) and the step 2) is 30-50 ℃; the stirring speed is 200-800 r/min;
and 3) stirring at 15-50 ℃ at a speed of 25-90 r/min.
10. The use of the iron tailings road base material as claimed in claim 4, wherein the iron tailings road base material is used in road engineering.
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Effective date of registration: 20231101 Address after: Room 101, Building 2, No. 614 Chuncheng Road, Chengyang Street, Chengyang District, Qingdao City, Shandong Province, 266000 Patentee after: Qingdao New Journey Foundation Materials Technology Co.,Ltd. Address before: No.336, nanxinzhuang West Road, Shizhong District, Jinan City, Shandong Province Patentee before: University of Jinan |