CN116063059B - Roadbed filler for solidifying iron tailings and roadbed construction method - Google Patents
Roadbed filler for solidifying iron tailings and roadbed construction method Download PDFInfo
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- CN116063059B CN116063059B CN202310057206.7A CN202310057206A CN116063059B CN 116063059 B CN116063059 B CN 116063059B CN 202310057206 A CN202310057206 A CN 202310057206A CN 116063059 B CN116063059 B CN 116063059B
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- iron tailings
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 49
- 238000010276 construction Methods 0.000 title claims abstract description 20
- 239000000945 filler Substances 0.000 title claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 73
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 33
- 239000000292 calcium oxide Substances 0.000 claims abstract description 23
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 23
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 18
- 239000010881 fly ash Substances 0.000 claims abstract description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 13
- 235000010755 mineral Nutrition 0.000 claims abstract description 13
- 239000011707 mineral Substances 0.000 claims abstract description 13
- 239000010456 wollastonite Substances 0.000 claims abstract description 11
- 229910052882 wollastonite Inorganic materials 0.000 claims abstract description 11
- 239000004568 cement Substances 0.000 claims abstract description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 7
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims abstract description 5
- 229940044172 calcium formate Drugs 0.000 claims abstract description 5
- 235000019255 calcium formate Nutrition 0.000 claims abstract description 5
- 239000004281 calcium formate Substances 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 239000003469 silicate cement Substances 0.000 claims abstract description 4
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims abstract description 3
- 229910052939 potassium sulfate Inorganic materials 0.000 claims abstract description 3
- 235000011151 potassium sulphates Nutrition 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 239000002689 soil Substances 0.000 claims description 19
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 25
- 238000002156 mixing Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- 238000010257 thawing Methods 0.000 abstract description 4
- 235000011118 potassium hydroxide Nutrition 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 17
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000003756 stirring Methods 0.000 description 10
- 238000007711 solidification Methods 0.000 description 7
- 230000008023 solidification Effects 0.000 description 7
- 238000010348 incorporation Methods 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000002585 base Substances 0.000 description 4
- 238000009472 formulation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 3
- 229910001653 ettringite Inorganic materials 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 235000012241 calcium silicate Nutrition 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- -1 fissures Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000003334 potential effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- 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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00224—Green materials, e.g. porous green ceramic preforms
-
- 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
-
- 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
Abstract
The application belongs to the field of roadbeds, and particularly relates to a roadbed filler for solidifying iron tailings and a roadbed construction method. The curing agent comprises a curing agent master batch, mineral powder and fly ash; the curing agent master batch comprises the following raw materials: silicate cement, sulphoaluminate cement, wollastonite powder, quicklime, potassium hydroxide, potassium sulfate, calcium formate and water glass. The waste tailings are combined with the curing agent to replace two layers of 18cm cement stabilized macadam materials, so that the cost is saved, the requirement of a temporary road is met, the curing time is short, the hardening speed is high, the compressive strength is high, the freeze-thawing resistance effect is good, the construction in winter can be realized, the performance is stable, and the inorganic curing agent has long service life; under standard curing conditions, adding the master batch, mineral powder and fly ash to form a curing agent, and mixing according to the mass ratio that the curing agent accounts for 10% of the natural iron tailings, wherein the unconfined compressive strength can reach 5-6MPa in 3 days and 9-10MPa in 7 days.
Description
Technical Field
The application belongs to the field of roadbeds, and particularly relates to a roadbed filler for solidifying iron tailings and a roadbed construction method.
Background
The roadbed is a strip-shaped structure which is constructed according to the route position and certain technical requirements and is used as a road surface foundation, and is a railway and highway foundation, and the roadbed is a linear structure constructed by soil or stone. And constructing the roadbed under good geological, hydrological and climatic conditions. The roadbed structure is a component part of a railway or a highway, is built above a foundation and is used for bearing the load on the rail or the foundation so as to ensure the structural stability of the rail or the foundation, and therefore, needs to be firm enough to provide support for the rail or the foundation; the roadbed is divided into three types of soil roadbed, stone roadbed and soil stone roadbed from the material aspect; the road subgrade is often used as a base material for road construction, is filled with weathered gravels, has a thicker filling thickness, and is compacted tightly by road compacting equipment so as to achieve compaction density required by standardization. The broken stone used by the roadbed needs to be mined by digging a quarrying mountain, which brings about ecological environment damage, so that the broken stone is more and more difficult to obtain and the price is high, and the searching of the substitute material of the roadbed filling becomes a new hot spot in the industry.
The iron tailings are industrial solid waste with the maximum yield and the lowest utilization rate in China, and at present, the iron tailings can only be piled up due to the limitation of the technical level. The large accumulation of the iron tailings not only occupies cultivated land and pollutes the environment, but also brings serious burden to related enterprises. In the industrial development report of comprehensive utilization of industrial solid wastes of China, 2019-2020, the total production of tailings in China is 12.72 hundred million tons in 2019, wherein the total production of iron tailings is 5.21 hundred million tons, and the total production of the tailings is 40.9% of the maximum production of the tailings. The comprehensive utilization of the iron tailings resources is urgent, the comprehensive utilization of the iron tailings can relieve the resource supply pressure, the degree of ecological environment pollution is reduced, in the comprehensive utilization of the iron tailings, the knowledge and grasp of the standardization level are enhanced, the method is based on the actual national conditions of China, perfect comprehensive utilization countermeasures of the iron tailings are formulated, the comprehensive utilization way of the iron tailings is expanded, the comprehensive utilization process of the iron tailings is reasonably promoted, and the utilization efficiency of mineral resources is improved. If the iron tailings can be applied to highway engineering, the problem of environment caused by iron tailings accumulation can be solved, the problem of shortage of road materials can be solved, the environment protection is facilitated, and natural resources are saved.
Disclosure of Invention
Aiming at the problems of comprehensive utilization of the iron tailings and roadbed construction in the current stage, the application effectively utilizes the iron tailings resources in the roadbed by grinding the high-performance environment-friendly curing agent so as to achieve the aim of changing waste into valuable and realize important social and economic benefits. The waste tailings and the curing agent are used for replacing two layers of 18cm cement stabilized macadam materials, so that the cost is saved, the requirement of a temporary road is met, and the pressure can reach more than 4MPa in 7 days.
The technical scheme of the application is as follows:
the roadbed filler for solidifying the iron tailings comprises a solidifying agent and the iron tailings;
the curing agent comprises 3-6 parts of curing agent master batch, 44-46 parts of mineral powder and 50 parts of fly ash;
the curing agent master batch comprises the following raw materials in parts by weight:
30-40 parts of silicate cement;
20-30 parts of sulphoaluminate cement;
15-20 parts of wollastonite powder;
5-10 parts of quicklime;
2-4 parts of potassium hydroxide;
0.5-1.5 parts of potassium sulfate;
0.3-0.5 part of calcium formate;
2-4 parts of water glass.
Preferably, the wollastonite powder is 300-500 meshes, and the Si content is more than 40%.
Preferably, the calcium oxide content in the quicklime is 70% or more.
Preferably, the curing agent and the iron tailings are added according to the proportion of 8-13 parts to 100 parts.
Further, the pavement structure comprises a subbase layer and a pavement structure base layer; the raw materials of the subbase layer are 10-13 parts of curing agent and 100 parts of iron tailings; the pavement structure base layer is prepared from 8-10 parts of curing agent and 100 parts of iron tailings.
The construction method of the roadbed comprises the following steps:
(1) Before roadbed construction, the surface compactness should be more than 90% after surface cleaning, leveling and rolling;
(2) The roadbed is filled and rolled in layers, each layer of soil is 30cm, the thickness of the roadbed after being maximally compacted is not more than 20cm, and the water content of the roadbed is controlled within 2% of the soil with the optimal water content.
And in the process of reacting tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite in the silicate cement with water, mixing cement with waste tailings, and quickly generating a large amount of colloid mixture through the reaction, releasing a large amount of heat, and simultaneously solidifying water in a soil body. With the progress of the reaction, some generated colloid substances are hardened, and when the hardened colloid is gradually increased, a space net structure is formed, so that the strength of the waste tailings is improved.
Volcanic ash reaction between the quicklime and the waste tailings, the active silicon dioxide in the silicon micropowder and the like is carried out to generate products such as hydrated calcium silicate and the like and needle-shaped crystals such as ettringite and the like; the free water in the soil can be fixed. At the same time, the volume of the ettringite crystallization process expands, and the expansion process fills the gaps between the waste tailings. Ettringite gel can surround and connect dispersed waste tailings into a piece, and the dispersed waste tailings are mutually connected to form a stable space network structure.
Potassium hydroxide can excite SiO in tailings 2 Is further combined with active SiO 2 The reaction generates a large amount of sodium silicate (K) 2 O·nSiO 2 ) Ca (OH) which is generated by the quicklime when meeting water 2 Reacting to obtain amorphous gel-CaO-SiO with high plastic strength 2 ·nH 2 O, which fills in the pores, fissures, holes of the formation or exists as cement, is beneficial to improving the strength and stability of the slurry consolidation.
This application disclosesThe main component of the main iron tailings in the waste tailings is SiO 2 、MgO、Fe 2 O 3 Etc., have potential activity. The mode of action of the cement hydration product and the iron tailing particles is revealed as follows: the hydration gel product wraps around the iron tailing particles, so that the cementing capability between the iron tailing particles is improved, the structural integrity is enhanced, and the pores are filled to enable the structure to be more compact. The quicklime not only can consume part of the water in the waste tailings, but also can generate Ca (OH) 2 The alkali is presented, which is favorable for exciting the activities of the waste iron tailings and other components of the curing agent, so as to avoid the influence of excessive expansion of the cured tailings on the application strength, and a certain amount of potassium hydroxide is added into the curing agent to increase the alkali, so that the activities of exciting and the fly ash are required as a master batch, and therefore, the proportion of the added potassium hydroxide to the quicklime cannot be too low.
Calcium formate: mainly plays the roles of a rapid hardening agent, a lubricant and an early strength agent. The hardening speed of cement in the master batch is increased, the setting time is shortened, and the setting speed is prevented from being too slow at low temperature especially in winter construction. The use amount of calcium formate can be regulated by long-term construction temperature, and the tailing backfilling work can be carried out when other works can not be constructed in winter, so that the operable period is greatly promoted.
Water glass: the curing agent and the full tailings during the tailing consolidation can play a very important role by adding the water glass. (1) The water glass is used as the binder, and the components of the curing agent and the whole tailings are better mixed together, so that the tailings slurry is more uniform and integrated. (2) The water glass is used as a quick-drying agent, so that the drying speed of the tailings after solidification construction is higher, the time for waiting for drying after pouring construction can be saved, and the next construction procedure can be performed more quickly.
Therefore, any material in the formula has irreplaceable effect on the curing effect of the curing agent, and the materials are mutually cooperated, so that the effect of curing tailings of the curing agent as a roadbed material is better. In practical application, the master batch can be transported only, the transportation cost of materials is reduced, the proportion of the master batch is added into the curing agent according to the requirements of different roadbeds, and meanwhile, the secondary curing agent can perfectly adjust the gradation of the whole tailings, so that the tailings are compacter after being cured.
The application has the beneficial effects that:
(1) The construction is simple, and the transportation cost is low: the curing agent master batch can reduce the cost of material transportation, and the main materials are locally obtained in terms of material taking, so that the real solid waste resource utilization is realized, the transportation cost of the materials is saved, and the use radius of the cementing material curing agent is further enlarged. During construction, the master batch and the main materials are only required to be mixed in the tailings according to the site requirement, and the construction is simple and convenient.
(2) The curing time is short, the hardening is fast, the compressive strength is high, the freezing and thawing resistance effect is good, the construction can be performed in winter, the performance is stable, and the service life of the inorganic curing agent modified soil is long; under standard curing conditions, 5% of master batch, 40% of mineral powder and 45% of fly ash are added to form a curing agent, and then the curing agent is mixed according to the mass ratio that the curing agent accounts for 10% of the natural iron tailings, wherein the unconfined compressive strength can reach 5-6MPa in 3 days and 9-10MPa in 7 days.
(3) The waste iron tailing curing agent replaces the traditional cement with high energy consumption and high pollution, ensures the reduction of the alkali metal doping amount, and achieves the aims of reaction after adding water, high strength, good durability and the like. The pavement can be normally solidified under the influence of complex environments such as dry and wet circulation, freeze thawing circulation, erosion solution action and the like.
Detailed Description
The waste tailings adopted in the embodiment are taken from a saddle steel iron tailings factory to be mainly subjected to magnetic separation, and the main component is SiO 2 The water content is about 60%.
Example 1
Preparing a curing agent master batch according to the material proportion in the table 1, wherein wollastonite powder is 300-500 meshes, and Si content is 40%; the calcium oxide content in the quicklime is 70%.
Then, 5% of the curing agent master batch, 45% of mineral powder and 50% of fly ash are combined into the curing agent.
Taking out tailings from the packaged bags with high water retention and packaged, weighing, mixing according to a certain mass ratio of the curing agent and the natural iron tailings, manually stirring until the mixture is uniform, adding pure water to the optimal water content, and manually stirring again to reach higher uniformity degree as much as possible; the above-mentioned curing agent-tailing mixture was subjected to sample preparation at the maximum dry density, 6 samples were prepared, and a fresh-keeping film was sealed on the upper portion thereof to prevent contact with the outside air and water loss, and the samples were put into a standard curing box for curing (relative humidity 95%, temperature 20 ℃) for 3 hours, and were taken out from the curing box for 7 hours d, and the average of the cured soil strength at each curing agent incorporation ratio was measured for unconfined compressive strength and is shown in table 2.
Table 1 saddle steel waste tailings solidified material masterbatch formulation
Table 2 saddle steel waste tailings solidification properties
Example 2
Preparing a curing agent master batch according to the material proportion in Table 3, wherein wollastonite powder is 300-500 meshes, and Si content is 42%; the calcium oxide content in the quicklime is 75%.
5% of curing agent master batch, 45% of mineral powder and 50% of fly ash are combined into the curing agent.
Taking out tailings from the packaged bags with high water retention and packaged, weighing, mixing according to a certain mass ratio of the curing agent and the natural iron tailings, manually stirring until the mixture is uniform, adding pure water to the optimal water content, and manually stirring again to reach higher uniformity degree as much as possible; the above-mentioned curing agent-tailing mixture was subjected to sample preparation at the maximum dry density, 6 samples were prepared, and a fresh-keeping film was sealed on the upper portion thereof to prevent contact with the outside air and water loss, and the samples were put into a standard curing box for curing (relative humidity 95%, temperature 20 ℃) for 3 hours, and were taken out from the curing box for 7 hours d, and the average of the cured soil strength at each curing agent incorporation ratio was measured for unconfined compressive strength and is shown in table 4.
Table 3 saddle steel waste tailings solidified material masterbatch formulation
Table 4 saddle steel waste tailings solidification properties
Example 3
Preparing a curing agent master batch according to the material proportion in Table 5, wherein wollastonite powder is 300-500 meshes, and Si content is 41%; the calcium oxide content in the quicklime is 74%.
5% of master batch, 45% of mineral powder and 50% of fly ash are combined into the curing agent.
Taking out tailings from the packaged bags with high water retention and packaged, weighing, mixing according to a certain mass ratio of the curing agent and the natural iron tailings, manually stirring until the mixture is uniform, adding pure water to the optimal water content, and manually stirring again to reach higher uniformity degree as much as possible; the above-mentioned curing agent-tailing mixture was subjected to sample preparation at the maximum dry density, 6 samples were prepared, and a fresh-keeping film was sealed on the upper portion thereof to prevent contact with the outside air and water loss, and the samples were put into a standard curing box for curing (relative humidity 95%, temperature 20 ℃) for 3 hours, and were taken out from the curing box for 7 d, and the average of the cured soil strength at each curing agent incorporation ratio was measured for unconfined compressive strength and is shown in table 6.
Table 5 saddle steel waste tailings solidified material masterbatch formulation
Table 6 solidification properties of saddle steel waste tailings
Example 4
Preparing a curing agent master batch according to the material proportion in Table 7, wherein wollastonite powder is 300-500 meshes, and Si content is 42%; the calcium oxide content in the quicklime is 71%.
4% of master batch, 46% of mineral powder and 50% of fly ash are combined into the curing agent.
Taking out tailings from the packaged bags with high water retention and packaged, weighing, mixing according to a certain mass ratio of the curing agent and the natural iron tailings, manually stirring until the mixture is uniform, adding pure water to the optimal water content, and manually stirring again to reach higher uniformity degree as much as possible; the above-mentioned curing agent-tailing mixture was subjected to sample preparation at the maximum dry density, 6 samples were prepared, and a fresh-keeping film was sealed on the upper portion thereof to prevent contact with the outside air and water loss, and the samples were put into a standard curing box for curing (relative humidity 95%, temperature 20 ℃) for 3 hours, and were taken out from the curing box for 7 hours d, and the average of the cured soil strength at each curing agent incorporation ratio was measured for unconfined compressive strength and is shown in table 8.
Table 7 saddle steel waste tailings solidification material formulation
Table 8 solidifying Properties of saddle Steel waste tailings
Example 5
Preparing a curing agent master batch according to the material proportion in Table 5, wherein wollastonite powder is 300-500 meshes, and Si content is more than 42%; the calcium oxide content in the quicklime is more than 73%.
3% of master batch, 47% of mineral powder and 50% of fly ash are combined into the curing agent.
Taking out tailings from the packaged bags with high water retention and packaged, weighing, mixing according to a certain mass ratio of the curing agent and the natural iron tailings, manually stirring until the mixture is uniform, adding pure water to the optimal water content, and manually stirring again to reach higher uniformity degree as much as possible; the above-mentioned curing agent-tailing mixture was subjected to sample preparation at the maximum dry density, 6 samples were prepared, and a fresh-keeping film was sealed on the upper portion thereof to prevent contact with the outside air and water loss, and the samples were put into a standard curing box for curing (relative humidity 95%, temperature 20 ℃) for 3 hours, and were taken out from the curing box for 7 d, and the average of the cured soil strength at each curing agent incorporation ratio was measured for unconfined compressive strength and is shown in table 9.
Table 9 saddle steel waste tailings solidification properties
Example 6
Preparing a curing agent master batch according to the material proportion in Table 5, wherein wollastonite powder is 300-500 meshes, and Si content is more than 40%; the calcium oxide content in the quicklime is more than 70%.
6% of master batch, 44% of mineral powder and 50% of fly ash are combined into the curing agent. The waste tailings are taken from saddle iron and steel tailings plants (mainly SiO2 is mainly used for magnetic dressing), and the water content is about 60%. Taking out tailings from a packaged bag with high water retention and packaged, weighing, preparing a curing agent by using a curing agent master batch according to a certain proportion, mixing according to a certain mass ratio of the curing agent and the natural iron tailings, manually mixing until the mixture is uniform, adding pure water to the optimal water content, and manually mixing again to reach higher uniform degree as much as possible; the above-mentioned curing agent-tailing mixture was subjected to sample preparation at the maximum dry density, 6 samples were prepared, and a fresh-keeping film was sealed on the upper portion thereof to prevent contact with the outside air and water loss, and the samples were put into a standard curing box for curing (relative humidity 95%, temperature 20 ℃) for 3 hours, and were taken out from the curing box for 7 hours d, and the average of the cured soil strength at each curing agent incorporation ratio was measured for unconfined compressive strength and is shown in table 10.
Table 10 saddle steel waste tailings solidification properties
According to the strength requirement and combined with the engineering comprehensive cost, the master batch proportion and the curing agent proportion in the embodiment 1 can be adopted, and the master batch and the main material are comprehensively applied, so that the transportation cost is greatly reduced, the application radius of the material is greatly increased, and the material has great help to popularization of the material.
Examples of the effects
The iron tailing subgrade materials prepared in examples 1-6 were constructed as follows:
(1) Before roadbed construction, the surface compactness should be more than 90% after surface cleaning, leveling and rolling;
(2) The roadbed is filled and rolled in layers, each layer of soil is 30cm, the thickness of the roadbed after being maximally compacted is not more than 20cm, and the water content of the roadbed is controlled within 2% of the soil with the optimal water content.
The prepared roadbed has short maintenance time, fast hardening, high compressive strength and good freeze-thawing resistance, can be constructed in winter, has stable performance and long service life of inorganic curing agent modified soil; under standard curing conditions, 5% of master batch, 40% of mineral powder and 45% of fly ash are added to form a curing agent, and then the curing agent is mixed according to the mass ratio that the curing agent accounts for 10% of the natural iron tailings, wherein the unconfined compressive strength can reach 5-6MPa in 3 days and 9-10MPa in 7 days.
Other requirements such as the relevant strength and the like completely meet the regulations of the table 11 and the table 12, and the relevant national standards of the compound national roadbed are met.
Table 11 main technical indices of pavement structure base and underlayment
Table 12 table of the compaction of the iron tailings subgrade, minimum strength of filler and maximum particle size
。
Claims (4)
1. The roadbed filler for solidifying the iron tailings is characterized by comprising a solidifying agent and the iron tailings;
the curing agent comprises 3-6 parts of curing agent master batch, 44-46 parts of mineral powder and 50 parts of fly ash;
the curing agent master batch comprises the following raw materials in parts by weight:
30-40 parts of silicate cement;
20-30 parts of sulphoaluminate cement;
15-20 parts of wollastonite powder;
5-10 parts of quicklime;
2-4 parts of potassium hydroxide;
0.5-1.5 parts of potassium sulfate;
0.3-0.5 part of calcium formate;
2-4 parts of water glass; wherein the wollastonite powder is 300-500 meshes, and the Si content is more than 40%; the calcium oxide content in the quicklime is more than 70%.
2. The roadbed filling material for solidifying iron tailings according to claim 1, wherein the solidifying agent and the iron tailings are added in a ratio of 8-13 parts to 100 parts.
3. A roadbed prepared from the roadbed filling materials for solidifying iron tailings according to claim 1 or 2, which comprises an underlayment and a pavement structure base layer; the raw materials of the subbase layer are 10-13 parts of curing agent and 100 parts of iron tailings; the pavement structure base layer is prepared from 8-10 parts of curing agent and 100 parts of iron tailings.
4. A method of constructing a subgrade according to any one of claims 1 to 3, comprising the steps of:
(1) Before roadbed construction, the surface compactness should be more than 90% after surface cleaning, leveling and rolling;
(2) The roadbed is filled and rolled in layers, each layer of soil is 30cm, the thickness of the roadbed after being maximally compacted is not more than 20cm, and the water content of the roadbed is controlled within 2% of the soil with the optimal water content.
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| CN104045292A (en) * | 2014-06-16 | 2014-09-17 | 江苏固维特材料科技有限公司 | Curing agent for filling iron tailings and preparation method thereof |
| CN109987892A (en) * | 2019-04-22 | 2019-07-09 | 东北大学秦皇岛分校 | One kind is based on flyash-iron tailings geo-polymer fibre reinforced materials and preparation method thereof |
| CN110002808A (en) * | 2019-05-17 | 2019-07-12 | 辽宁工程技术大学 | A kind of alkali-activated material solidification iron tailings sand and preparation method thereof and application method |
| CN111704384A (en) * | 2020-06-23 | 2020-09-25 | 宁波夯涌科技环保有限公司 | Liquid stabilizer for engineering building muck and mud solidified soil and use method thereof |
| WO2022160711A1 (en) * | 2021-01-27 | 2022-08-04 | 中钢集团马鞍山矿山研究总院股份有限公司 | Gelling agent for curing heavy metal ions in tailings and use method thereof |
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| US7939154B2 (en) * | 2007-11-02 | 2011-05-10 | Regents Of The University Of Minnesota | Road and repair materials including magnetite and methods regarding same |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104045292A (en) * | 2014-06-16 | 2014-09-17 | 江苏固维特材料科技有限公司 | Curing agent for filling iron tailings and preparation method thereof |
| CN109987892A (en) * | 2019-04-22 | 2019-07-09 | 东北大学秦皇岛分校 | One kind is based on flyash-iron tailings geo-polymer fibre reinforced materials and preparation method thereof |
| CN110002808A (en) * | 2019-05-17 | 2019-07-12 | 辽宁工程技术大学 | A kind of alkali-activated material solidification iron tailings sand and preparation method thereof and application method |
| CN111704384A (en) * | 2020-06-23 | 2020-09-25 | 宁波夯涌科技环保有限公司 | Liquid stabilizer for engineering building muck and mud solidified soil and use method thereof |
| WO2022160711A1 (en) * | 2021-01-27 | 2022-08-04 | 中钢集团马鞍山矿山研究总院股份有限公司 | Gelling agent for curing heavy metal ions in tailings and use method thereof |
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