CN116514462A - Resource utilization method of high-water-content muddy engineering slag soil - Google Patents
Resource utilization method of high-water-content muddy engineering slag soil Download PDFInfo
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- CN116514462A CN116514462A CN202310418550.4A CN202310418550A CN116514462A CN 116514462 A CN116514462 A CN 116514462A CN 202310418550 A CN202310418550 A CN 202310418550A CN 116514462 A CN116514462 A CN 116514462A
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- 239000002689 soil Substances 0.000 title claims abstract description 76
- 239000002893 slag Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000000203 mixture Substances 0.000 claims abstract description 42
- 238000012216 screening Methods 0.000 claims abstract description 28
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 238000003763 carbonization Methods 0.000 claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 18
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 14
- 238000012423 maintenance Methods 0.000 claims abstract description 13
- 239000011265 semifinished product Substances 0.000 claims abstract description 8
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 7
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 36
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 24
- 239000000843 powder Substances 0.000 claims description 24
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000011575 calcium Substances 0.000 claims description 13
- 239000000292 calcium oxide Substances 0.000 claims description 13
- 235000012255 calcium oxide Nutrition 0.000 claims description 13
- 238000004064 recycling Methods 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000001569 carbon dioxide Substances 0.000 claims description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 12
- 239000002956 ash Substances 0.000 claims description 11
- 208000005156 Dehydration Diseases 0.000 claims description 10
- 230000018044 dehydration Effects 0.000 claims description 10
- 238000006297 dehydration reaction Methods 0.000 claims description 10
- 239000010881 fly ash Substances 0.000 claims description 9
- 239000000395 magnesium oxide Substances 0.000 claims description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 9
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 9
- 229910052791 calcium Inorganic materials 0.000 claims description 8
- 238000007873 sieving Methods 0.000 claims description 8
- 238000006477 desulfuration reaction Methods 0.000 claims description 7
- 230000023556 desulfurization Effects 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 238000007710 freezing Methods 0.000 abstract description 5
- 230000008014 freezing Effects 0.000 abstract description 3
- 238000006703 hydration reaction Methods 0.000 description 12
- 239000000047 product Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 238000010000 carbonizing Methods 0.000 description 9
- 239000004927 clay Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000010813 municipal solid waste Substances 0.000 description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 5
- 230000036571 hydration Effects 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 239000000378 calcium silicate Substances 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910019440 Mg(OH) Inorganic materials 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 239000005539 carbonized material Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a resource utilization method of high-water-content muddy engineering slag soil, which comprises the following steps: s1, adding a curing agent into high-water-content muddy engineering dregs to mix, dehydrating, crushing and screening to obtain semi-finished dregs; s2, placing the semi-finished product residue soil into a carbonization chamber for carbonization maintenance to obtain carbonized soil mixed materials; s3, mixing the carbonized soil with cement, an admixture, aggregate and sodium bicarbonate to obtain a carbonized solidified soil mixture; s4, crushing and screening the carbonized and solidified soil mixture, and paving and rolling to obtain a base material. The high-performance road material obtained by the method has high strength, high water stability coefficient and good freezing resistance.
Description
Technical Field
The invention belongs to the technical field of recycling of high-water-content silt engineering dregs, and particularly relates to a recycling method of high-water-content silt engineering dregs.
Background
The high-water-content muddy engineering slag soil is mainly characterized in that: the water content is high, the particles are extremely fine, the water absorption is good, the water permeability and the air permeability are poor, the bearing capacity is weak, the content of the clay particles is high, the clay particles are extremely high, the clay particles have extremely high viscosity, the properties such as plasticine are extremely strong, the clay particles have no fluidity, a certain amount of impurities such as large stones and construction waste (especially excavation clay, more impurities) can be wrapped and adhered to the clay particles, the recycling difficulty is extremely high, the large-scale recycling of the clay particles is realized finally, and the clay particles can be realized only by carrying out secondary deep processing after dehydration and desiccation on the clay particles no matter whether soil materials are utilized or building materials are utilized.
At present, the problems of complex process, higher cost, low treatment efficiency, unstable product performance and the like exist in the research of recycling the high-water-content muddy engineering muck into road materials, and the main process is as follows: 1. the method comprises the steps of diluting the dregs into slurry by adding water, carrying out plate-frame filter pressing and dehydration, and adding a curing agent into a filter pressing mud cake for uniform mixing treatment to form a road material, wherein the process has the problems of low treatment efficiency, high cost and substandard product performance; 2. naturally airing, dehydrating by matching with a mechanical turning manner, and then adding a curing agent into dehydrated slag soil to produce a road material, wherein the method has the problems of low productivity, easiness in being influenced by weather and the like; 3. the mechanical thermal dehydration mode has the problems of high production cost, insufficient treatment capacity, energy conservation and environmental protection; 4. the existing curing agents used for preparing the road material mainly comprise inorganic curing agents and organic curing agents, and as the road material has requirements on mechanical properties, the requirements can be met by matching the two curing agents, and the problems of uneven mixing and environmental pollution can be caused when the organic curing agents are used. Therefore, for recycling the engineering dregs with high water content and silt as a base material, no method which has the advantages of simple process, stable product performance, low cost, environmental protection and no pollution and can continuously treat the dregs in a large scale exists.
Disclosure of Invention
The invention aims to provide a recycling method of high-water-content silt engineering muck, which aims at overcoming the defects of the prior muck recycling technology as a base material, solves the problems of complex recycling technology, unstable product performance, high cost and the like of the silt engineering muck, and achieves the purposes of continuous, large-scale and efficient recycling of the muck.
Based on the above purpose, the invention provides a resource utilization method of high-water-content muddy engineering slag, which comprises the following steps:
s1, adding a curing agent into high-water-content muddy engineering dregs to carry out mixed dehydration treatment, and then crushing, impurity removing and screening to obtain semi-finished dregs;
s2, placing the semi-finished product residue soil into a carbonization chamber for carbonization maintenance to obtain carbonized soil mixed materials;
s3, mixing the carbonized soil with cement, an admixture, aggregate and sodium bicarbonate, and supplementing water to the optimal water content according to the requirement to obtain a carbonized solidified soil mixture;
s4, crushing and screening the carbonized and solidified soil mixture, and then paving and rolling to obtain a base material.
Further, the high-water-content muddy engineering slag soil is plastic, the water content of the high-water-content muddy engineering slag soil is 50% -60%, the organic matters are 5% -10%, and the particle size of the high-water-content muddy engineering slag soil is more than 10% of the high-water-content muddy engineering slag soil with the particle size of more than 50 mm.
Further, the step S1 specifically includes the following steps: a, dehydration treatment: uniformly stirring high-water-content muddy engineering slag soil and a curing agent through a strong stirring head device, turning over and throwing through a digging machine, and naturally maintaining to reduce the water content of the slag soil to be within 20%; b, crushing and impurity removing treatment: crushing and screening the dehydrated dregs through a screening hopper, and taking particles with the particle size of less than 50mm and removing the part with the particle size of more than 50mm as impurities; c, screening treatment: crushing and screening the residue soil after impurity removal by crushing and screening hopper equipment again to obtain semi-finished product residue soil with the particle size of less than 15mm.
Further, the method according to claim 1, characterized by: the curing agent in the step S1 comprises steel slag powder, quicklime, active magnesium oxide and cement clinker, and the dosage of the curing agent is 1-10%, 1-6%, 0.5-1% and 1-10% of the mass of the high-water-content muddy engineering slag soil respectively.
Further, the curing agent in the step S1 further comprises power plant desulfurization ash or high-calcium fly ash, wherein the dosage of the power plant desulfurization ash is 1-3% of the mass of the high-water-content muddy engineering slag, and the dosage of the high-calcium fly ash is 1-7% of the mass of the high-water-content muddy engineering slag.
Further, in the carbonization maintenance of the step S2, the maintenance humidity is 60-70%, the carbon dioxide pressure is 100-300Kpa, the carbon dioxide volume concentration is 80-90%, and the carbonization time is 3-6h.
Further, the mass ratio of the carbonized soil to the cement, the admixture, the aggregate and the sodium bicarbonate in the S3 is 100:1-3:0.5-2:1-5:0.1-0.8.
Further, the aggregate is construction waste, the grain diameter is smaller than 15mm, and the grain content smaller than 10mm is more than or equal to 75%.
Further, after being screened by a crushing and screening hopper in the step S4, the particle size of the mixed material is less than or equal to 15mm.
The invention also relates to a road material which is prepared by adopting the method.
The invention has the following beneficial effects:
according to the pretreatment process, firstly, the steel slag powder, the quicklime, the active magnesium oxide and the cement clinker are mixed with the silt engineering slag soil, meanwhile, the desulfurization ash and/or the high-calcium fly ash of the power plant can be added, the water content of the slag powder is reduced through the physical and chemical actions, and then the carbonization maintenance is matched, so that the second reduction of the water content of the slag powder is realized, and finally, the water content of the silt engineering slag soil can be reduced to about the optimal water content.
Wherein the quicklime has water absorption property, can reduce the water content of the silt residue soil, and can react with water in the silt residue soil exothermically to generate Ca (OH) 2 Providing alkaline environment for hydration reaction of cement clinker, fly ash, steel slag powder and the like, and generating Ca (OH) 2 Can also participate in carbonization reaction to generate crystal CaCO 3 Further reducing the water content of the silt. The added active magnesium oxide can generate hydration reaction with the silt engineering slag water to generate Mg (OH) 2 Crystallizing to enhance the strength of dregs and then mixing with CO 2 Generating carbonization reaction to generate prismatic MgCO 3 ·3H 2 O and 4MgCO 3 ·Mg(OH) 2 ·4H 2 The crystallization carbonized products such as O can reduce the water content of the silt engineering dregs and improve the mechanical properties of the silt engineering dregs; the steel slag powder has the skeleton effect, opens a water permeable channel of the silt engineering slag soil, improves the gap spacing between soil particles, accelerates the dehydration rate, and is beneficial to the subsequent CO 2 The slag powder enters the slag soil to generate sufficient carbonization reaction, so that the moisture content of the slag soil is reduced, the mechanical property of the slag soil is improved, and the active ingredients in the steel slag powder react with the hydration reaction in an alkaline environment to generate hydration products, so that the moisture content of the slag soil is reduced, the mechanical property of the slag soil is improved, and the free calcium oxide exists in the steel slag powder, so that the steel slag powder can participate in the hydration reaction and the carbonization reaction; the desulfurization ash, the high-calcium fly ash and the cement clinker of the power plant can react with hydration reaction, volcanic ash reaction and carbonization reaction in the silt slag soil to finally form hydration products of hydrated calcium silicate C-S-H, hydrated calcium aluminate C-A-H, ettringite and carbonization products, thereby reducing the moisture content of the slag soil and improving the mechanical property of the slag soil.
The carbonized material of the invention can be added into cement to generate hydration reaction with water in the silt residue soil to generate hydration products and Ca (OH) 2 The active components of silicon-aluminum in the superfine powder admixture are Ca (OH) 2 Under the action of the catalyst, the hydration reaction is carried out to generate hydrated calcium silicate C-S-H, hydrated calcium aluminate C-A-H and ettringite, so that the mechanical property, stability and durability of the base material are improved;sodium bicarbonate particles can be decomposed to form sodium carbonate and carbon dioxide, wherein the sodium carbonate has promotion effect on cement hydration, and can improve calculus rate, and the carbon dioxide can be used as carbon source for carbonization reaction and further can be used as excessive Ca (OH) in the system 2 Magnesium oxide, hydrated calcium silicate C-S-H and hydrated calcium aluminate C-A-H react and carbonize to generate carbonized products; the construction waste aggregate mainly plays a role of a skeleton, so that the mechanical property of the roadbed material is improved; under the synergistic effect of the materials, the generated hydration products and the generated crystallization carbonization products are filled in the pores of the silt engineering dregs, so that the whole body of the silt engineering dregs is compact, the working performance of the prepared road material is improved, and the conversion from the silt engineering dregs with high water content to the high-performance highway base material is realized.
The high-performance base material of the material treated by the method provided by the invention has the organic matters less than or equal to 5%, the compactness of the material used as a road material after being paved and rolled is more than or equal to 96%, the unconfined compressive strength of 7d is more than or equal to 4.5Mpa, the water stability coefficient is more than or equal to 85%, and the antifreeze index of 28d is more than or equal to 80%.
The invention has the beneficial effects that:
(1) The invention not only reasonably and effectively solves the environmental pollution problems of high-water-content muddy engineering slag, such as disordered piling, disordered filling, disordered throwing and the like, but also takes the treated slag as a base material, thereby greatly reducing the consumption of traditional soil materials, avoiding the environmental and energy problems caused by the traditional production process of slag, pond slag and water stable materials, reducing the damage of mountain resources and realizing the purposes of harmless and recycling treatment of engineering slag.
(2) The invention can treat high-water-content silt residue soil with high efficiency, low cost, continuity and large scale, has simple process, and the preparation of the high-water-content silt residue soil has the advantages of excellent mechanical property, high stability, good water resistance, low carbon, environment protection and high added value, can completely or partially replace the traditional residue, pond residue and water stabilizing material, and has good market prospect.
(3) The pretreatment dehydration process is simple, the pretreatment equipment can solve the problems of dehydration, drying, impurity removal and screening by only needing a powerful stirring head and a screening hopper, and the used curing agent raw material is basically solid waste, is low in cost and easy to obtain, and has wide engineering application prospect compared with the existing treatment process, and the treatment cost is reduced.
(4) Compared with the current mainstream treatment process, the road material provided by the invention does not need long-time maintenance, and can reach the optimal water content and related mechanical property indexes within three days, so that the production efficiency is improved.
(5) In the preparation process of the road material, a large amount of industrial waste gas CO is absorbed by carbonization 2 Is beneficial to reducing the greenhouse effect and accords with the double-carbon policy of China.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention.
Example 1
The method for recycling the high-water-content muddy engineering dregs comprises the following steps:
(1) And (3) carrying out related index detection on the silt engineering slag soil in a certain area of the coastal region of Zhejiang to obtain the silt engineering slag soil with the water content of 53.1%, the organic matter content of 6.2% and the particle size of more than or equal to 50mm accounting for about 13%. Adding the high-water-content silt engineering dregs into a curing agent for mixing, then dehydrating, and then crushing, removing impurities and screening to obtain semi-finished dregs; wherein the curing agent is shown in Table 1.
TABLE 1
Note that: % is mass percent.
During specific treatment, after the curing agent and the dregs are fully stirred by the powerful stirring head, the dregs are turned over by the digging machine, the water content of the dregs is reduced to below 20% after the natural maintenance is carried out for 3 days, then the dregs are screened by the screening hopper to remove large-particle stones or garbage, so that the uniform particle size of the mixture is ensured, and finally the mixture is crushed and screened by the screening hopper to ensure that the particle size of the material is not higher than 15mm, so that the semi-finished dregs are obtained.
(2) Placing the semi-finished product slag soil mixture into a carbonization maintenance device for CO 2 And (3) carbonizing and curing, wherein the carbonizing and curing conditions are that the curing humidity is 65%, the carbon dioxide pressure is 280Kpa, the carbon dioxide concentration is 80%, and the carbonizing time is 4 hours, so that the carbonized soil mixture is obtained.
(3) Mixing the carbonized soil and cement clinker with the mixing amount of 2 percent, superfine powder with the mixing amount of 1 percent, building rubbish aggregate with the mixing amount of 1.5 percent and sodium bicarbonate with the mixing amount of 0.5 percent, conveying the mixture to a homomixer for uniform stirring, and fully and uniformly stirring to obtain the carbonized and solidified mixture.
(4) Crushing and screening the carbonized and solidified soil mixture through a screening hopper, paving the mixture on a field with the grain size not higher than 15mm after surface cleaning, and rolling the mixture by using a 20t road roller after paving and leveling to obtain the qualified road material. The optimum water content, maximum dry density and in-situ compactibility of the road mix were determined as shown in Table 2 below. The on-site mixture was molded by referring to the Highway engineering inorganic binder stabilization Material test procedure, and after curing, the unconfined compressive strength, the water stability coefficient and the anti-freezing index were measured for 7 days and are shown in Table 2. The carbonized and solidified soil road material can be used for filling a main road base layer.
TABLE 2
From the above table, it can be seen that when materials such as steel slag powder, quicklime, active magnesium oxide and the like are absent in the curing agent, the unconfined compressive strength, the water stability and the freezing resistance of the base material are all affected.
Example 2
(1) And (3) carrying out related index detection on the silt engineering muck in a coastal region of Guangdong to obtain the silt engineering muck with the water content of 57.8% and the organic matter content of 8.5%. The method comprises the steps of mixing steel slag powder with the mixing amount of 2%, quicklime with the mixing amount of 2%, dehydrated ash of a power plant with the mixing amount of 1.5%, high-calcium fly ash with the mixing amount of 2%, active magnesium oxide with the mixing amount of 1%, cement clinker with the mixing amount of 2% into dregs, stirring the mixture fully through a stirring head, turning the mixture through a digging machine, naturally curing the mixture, reducing the water content of the dregs to below 20%, sieving the mixture through a vibrating screen to remove large-particle stones or garbage, ensuring that the particle size of the mixture is uniform, and crushing and sieving the mixture through a sieving bucket to ensure that the particle size of the material is not higher than 15mm, thereby obtaining semi-finished dregs.
(2) Putting the semi-finished product dregs into a carbonization maintenance device for CO 2 And (3) carbonizing and curing, wherein the carbonizing and curing condition is that the curing humidity is 60%, the carbon dioxide pressure is 300Kpa, the carbon dioxide concentration is 90%, and the carbonizing time is 6h, so that the carbonized soil mixture is obtained.
(3) And mixing the carbonized soil mixture with cement clinker, superfine powder admixture, building rubbish aggregate and sodium bicarbonate, wherein the specific proportion is shown in the following table 3, and conveying the mixture to a homomixer for uniform stirring, and fully and uniformly stirring to obtain the carbonized solidification mixture.
TABLE 3 Table 3
(4) Crushing and screening the carbonized and solidified soil mixture through a screening hopper, paving the mixture on a field with the grain size not higher than 15mm after surface cleaning, and rolling the mixture by using a 20t road roller after paving and leveling to obtain the qualified road material. The optimum water content, maximum dry density and in-situ compactibility of the road mix were determined as shown in Table 4 below. The on-site mixture was molded by referring to the Highway engineering inorganic binder stabilization Material test procedure, and after curing, the unconfined compressive strength, the water stability coefficient and the anti-freezing index were measured for 7 days and are shown in Table 4. The carbonized and solidified soil road material can be used for filling a main road base layer.
TABLE 4 Table 4
It can be seen from the above table that the absence of sodium bicarbonate results in a significant decrease in the water stability and freeze resistance of the base material.
Example 3
(1) And (3) carrying out related index detection on the silt engineering slag soil in a certain area of coastal areas of Jiangsu, so as to obtain the silt engineering slag soil with the water content of 59.2% and the organic matter content of 5.3%. The method comprises the steps of fully stirring steel slag powder with the doping amount of 2.5%, quicklime with the doping amount of 4%, dehydrated ash of a power plant with the doping amount of 2%, active magnesium oxide with the doping amount of 0.5%, cement clinker with the doping amount of 1% and dregs by a powerful stirring head, turning over by a digging machine, naturally maintaining, reducing the moisture content of the dregs to below 20%, sieving by a vibrating screen to remove large-particle stones or garbage so as to ensure that the particle size of the mixture is uniform, and finally crushing and sieving by a sieving hopper so that the particle size of the material is not higher than 15mm to obtain semi-finished dregs.
(2) Putting the semi-finished product dregs into a carbonization maintenance device for CO 2 And (3) carbonizing and curing, wherein the carbonizing and curing conditions are that the curing humidity is 60%, the carbon dioxide pressure is 100Kpa, the carbon dioxide concentration is 80%, and the carbonizing time is 3 hours, so that the carbonized and cured soil mixture is obtained.
(3) Mixing the carbonized soil and cement clinker with the mixing amount of 1 percent, superfine powder with the mixing amount of 2 percent, building rubbish aggregate with the mixing amount of 1.9 percent and sodium bicarbonate with the mixing amount of 0.1 percent, conveying the mixture to a homomixer for uniform stirring, and fully and uniformly stirring to obtain the carbonized curing mixture.
(4) Crushing and screening the carbonized and solidified soil mixture through a screening hopper, paving the mixture on a field with the grain size not higher than 15mm after surface cleaning, and rolling the mixture by using a 20t road roller after paving and leveling to obtain qualified road materials. The optimal water content of the road mixture is 17.6 percent and the maximum dry density is 1.78g/cm 3 The field compactness is 96.1%, the field mixture is molded by referring to the Highway engineering inorganic binder stabilizing material test procedure, the unconfined compressive strength is 4.7Mpa after curing, the water stability coefficient is 86%, and the freezing resistance index is 81%. The carbonized and solidified soil road material can be used for filling the foundation layer of the main road.
The steel slag powder used in the above examples is converter steel slag, wherein the calcium oxide content is more than 30%, and the granularity range is 0.075mm-2.0mm; the content of effective calcium oxide in the quicklime is more than 70%, and the grain diameter is not less than 0.1mm; the dehydrated ash of the power plant is a byproduct generated by adopting a wet flue gas desulfurization process, and the main components of the dehydrated ash comprise calcium sulfate dihydrate, calcium sulfite, calcium hydroxide and calcium oxide, and the particle size is not less than 74 mu m; the high-calcium fly ash is an industrial byproduct produced by a power plant, the content of calcium oxide is not less than 10 percent, and the particle size is not less than 74 mu m; the active magnesium oxide has an active ingredient of not less than 80%, an active index of 40-80% and a loss on ignition of not more than 10%, and in addition, the superfine powder admixture in the above embodiment is prepared by adopting stone powder, slag powder, tailing powder, cement clinker and an exciting agent according to a ratio of 32:31:15:22:6. However, the ultrafine powder admixture is not limited to the above formulation, as long as the specific surface area is not less than 400m 2 The mixing amount of the active index is 75-95 percent per kg.
The specific application field of the present invention is merely a preferred embodiment of the present invention, but the application scope of the present invention is not limited thereto. The foregoing embodiments are merely illustrative of the technical idea and features of the present invention, and the present invention is not limited to the preferred embodiments. Within the technical scope of the present disclosure, the technical solution and the invention concept according to the present disclosure are equivalent to or improved from the above description, and all the equivalent changes or modifications are included in the scope of the present disclosure.
Claims (10)
1. The method for recycling the high-water-content muddy engineering dregs is characterized by comprising the following steps of:
s1, adding a curing agent into high-water-content muddy engineering dregs to carry out mixed dehydration treatment, and then crushing, impurity removing and screening to obtain semi-finished dregs;
s2, placing the semi-finished product residue soil into a carbonization chamber for carbonization maintenance to obtain carbonized soil mixed materials;
s3, mixing the carbonized soil with cement, an admixture, aggregate and sodium bicarbonate, and supplementing water to the optimal water content according to the requirement to obtain a carbonized solidified soil mixture;
s4, crushing and screening the carbonized and solidified soil mixture, and then spreading and rolling to obtain the high-performance base material.
2. The method according to claim 1, characterized in that: the high-water-content muddy engineering slag soil is plastic, the water content of the high-water-content muddy engineering slag soil is 50% -60%, the organic matters are 5% -10%, and the particle size of the high-water-content muddy engineering slag soil is more than 10% of that of the high-water-content muddy engineering slag soil.
3. The method according to claim 1, characterized in that: s1 specifically comprises the following steps: a, dehydration treatment: uniformly stirring high-water-content muddy engineering slag soil and a curing agent through a strong stirring head device, turning over and throwing through a digging machine, and naturally maintaining to reduce the water content of the slag soil to be within 20%; b, crushing and impurity removing treatment: crushing and screening the dehydrated dregs through a screening hopper, and taking particles with the particle size of less than 50mm and removing the part with the particle size of more than 50mm as impurities; c, screening treatment: crushing and screening the residue soil after impurity removal by crushing and screening hopper equipment again to obtain semi-finished product residue soil with the particle size of less than 15mm.
4. The method according to claim 1, characterized in that: the method according to claim 1, characterized in that: the curing agent in the step S1 comprises steel slag powder, quicklime, active magnesium oxide and cement clinker, and the dosage of the curing agent is 1-10%, 1-6%, 0.5-1% and 1-10% of the mass of the high-water-content muddy engineering slag soil respectively.
5. A method according to claim 3, characterized in that: the curing agent in the step S1 further comprises power plant desulfurization ash or high-calcium fly ash, wherein the dosage of the power plant desulfurization ash is 1-3% of the mass of the high-water-content muddy engineering slag, and the dosage of the high-calcium fly ash is 1-7% of the mass of the high-water-content muddy engineering slag.
6. The method according to claim 1, characterized in that: and in the step S2, during carbonization maintenance, the maintenance humidity is 60-70%, the carbon dioxide pressure is 100-300Kpa, the carbon dioxide volume concentration is 80-90%, and the carbonization time is 3-6h.
7. The method according to claim 1, characterized in that: and in the S3, the mass ratio of the carbonized soil to the cement, the admixture, the aggregate and the sodium bicarbonate is 100:1-3:0.5-2:1-5:0.1-0.8.
8. The method according to claim 1, characterized in that: the aggregate is construction waste, the grain diameter is less than 15mm, and the grain content less than 10mm is more than or equal to 75%.
9. The method according to claim 1, characterized in that: and S4, sieving by a crushing and sieving hopper, wherein the particle size of the mixed material is less than or equal to 15mm.
10. A road base material prepared by the method of any one of claims 1 to 9.
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| CN117612655B (en) * | 2024-01-22 | 2024-04-09 | 中建安装集团有限公司 | Optimal design and preparation method of sludge solidification mixture |
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