CN108342935B - Composition, preparation method and application of composition in roadbed isolation layer - Google Patents
Composition, preparation method and application of composition in roadbed isolation layer Download PDFInfo
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- CN108342935B CN108342935B CN201810175797.7A CN201810175797A CN108342935B CN 108342935 B CN108342935 B CN 108342935B CN 201810175797 A CN201810175797 A CN 201810175797A CN 108342935 B CN108342935 B CN 108342935B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
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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
- 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
Abstract
The invention belongs to the technical field of road materials and structures, and particularly relates to a composition, a preparation method and application thereof in a roadbed isolating layer, and the invention provides a composition, which comprises the following components in parts by weight: activated carbon sponge, iron-carbon micro-electrolysis filler, activated alumina, deoxidizer, polyaluminium chloride, titanium dioxide, portland cement, clay layer oil, non-woven geotextile and polypropylene ultrafiltration membrane. The invention also provides a preparation method of the composition, and application of the composition or a product obtained by the preparation method in a roadbed isolating layer for blocking permeation of heavy metal and/or inorganic salt pollutants. The product prepared by the technical scheme provided by the invention has good separation and purification effects, can effectively adsorb and degrade heavy metal elements, and can separate the seepage of inorganic salt pollutants; solves the technical defects of environmental pollution and groundwater pollution easily caused by industrial waste serving as roadbed filling materials in the prior art.
Description
Technical Field
The invention belongs to the technical field of road materials and structures, and particularly relates to a composition, a preparation method and application thereof in a roadbed isolation layer; further, it relates to a composition, a preparation method and its application in a roadbed isolating layer for blocking the permeation of heavy metal and/or inorganic salt pollutants.
Background
The industry is one of the prop industries in China and is one of the important driving forces for economic development in China. With the annual expansion of industrial production scale, a large amount of waste materials such as slag, coal gangue and carbide slag generated in smelting, chemical production and the like are generated in the production process. In order to recycle waste materials, industrial waste materials such as coal gangue, slag, and carbide slag have recently been used in road construction, and roadbed filling as a filler has become one of important ways of waste material utilization. Because of the great demand of road construction for building materials, a large amount of industrial waste is applied to road construction.
However, in the process, although waste recycling is realized, since industrial slag contains different types of heavy metal elements and inorganic salt pollutants, after the industrial slag is used for filling a roadbed, the polluted elements and inorganic salt can seep into underground water along with the seepage of the upper part, and serious pollution is caused to the natural environment; further, groundwater may be contaminated during industrial waste reclamation roadbed applications.
Therefore, it is an urgent need for the skilled in the art to develop a composition, a preparation method and an application thereof in a roadbed isolation layer to solve the technical defects that the industrial waste is easy to cause environmental pollution and groundwater pollution when used as a roadbed filling material in the prior art.
Disclosure of Invention
In view of the above, the present invention provides a composition, a preparation method thereof, and an application thereof in a roadbed isolation layer, which are used for solving the technical defects that in the prior art, when industrial waste is used as a roadbed filling material, environmental pollution and groundwater pollution are easily caused.
The invention provides a composition, which comprises the following raw materials: activated carbon sponge, iron-carbon micro-electrolysis filler, activated alumina, deoxidizer, polyaluminium chloride, titanium dioxide, portland cement, clay layer oil, non-woven geotextile and polypropylene ultrafiltration membrane.
Preferably, the raw materials of the composition comprise, by mass: 130-515 parts of activated carbon sponge, 200-350 parts of iron-carbon micro-electrolysis filler, 160-200 parts of activated alumina, 130-220 parts of deoxidizer, 20-40 parts of polyaluminium chloride, 30-60 parts of titanium dioxide, 50-100 parts of Portland cement, 800 parts of binding oil, 100-300 parts of non-woven geotextile and 22 parts of polypropylene ultrafiltration membrane.
Preferably, the raw materials of the composition comprise, by mass: 260-400 parts of activated carbon sponge, 260-300 parts of iron-carbon micro-electrolysis filler, 180-190 parts of activated alumina, 160-190 parts of deoxidizer, 25-35 parts of polyaluminium chloride, 40-50 parts of titanium dioxide, 70-80 parts of Portland cement, 800 parts of binding oil, 150-250 parts of non-woven geotextile and 22 parts of polypropylene ultrafiltration membrane.
Preferably, the raw materials of the composition comprise, by mass: 320 parts of activated carbon sponge, 280 parts of iron-carbon micro-electrolysis filler, 190 parts of activated alumina, 180 parts of deoxidizer, 30 parts of polyaluminium chloride, 40 parts of titanium dioxide, 70 parts of Portland cement, 800 parts of binding oil, 200 parts of non-woven geotextile and 22 parts of polypropylene ultrafiltration membrane.
Preferably, the activated carbon sponge is honeycomb-shaped activated carbon, and the thickness of the activated carbon sponge is 2-8 mm;
the carbon content of the activated carbon sponge is more than 50%, and the benzene adsorption rate of the activated carbon sponge is more than 90%.
Preferably, the iron-carbon microelectrolytic filler is selected from: the iron-carbon microelectrolysis filler is in a granular structure, and the particle size of the iron-carbon microelectrolysis filler is 10-20 meshes;
the iron content of the iron-carbon micro-electrolysis filler is more than 55%, the carbon content of the iron-carbon micro-electrolysis filler is more than 10%, the porosity of the iron-carbon micro-electrolysis filler is more than 45%, the wear rate of the iron-carbon micro-electrolysis filler is less than 0.04%, and the breakage rate of the iron-carbon micro-electrolysis filler is less than 0.05%.
Preferably, the activated alumina is: gamma-activated alumina and/or X-rho activated alumina, wherein the particle size of the activated alumina is 30 meshes.
Preferably, the deoxidizer is a sulfite and/or a reduced iron powder, and the particle size of the deoxidizer is 20 meshes.
Preferably, the polyaluminum chloride is water treatment grade polyaluminum chloride, and the particle size of the polyaluminum chloride is 200 meshes.
Preferably, the titanium dioxide is titanium-removed type titanium dioxide and/or rutile type titanium dioxide, and the particle size of the titanium dioxide is 200 meshes.
Preferably, the viscous layer oil is quick-cracking cation PC-3 type emulsified asphalt and/or quick-cracking anion PA-3 type emulsified asphalt.
Preferably, the non-woven geotextile is a needle-punched geotextile, and the thickness of the non-woven geotextile is 1.9 mm;
the wall thickness of the polypropylene ultrafiltration membrane is 50 mu m, and the molecular weight cut-off of the polypropylene ultrafiltration membrane is 5-10 ten thousand.
The invention also provides a preparation method of the composition, which comprises the following steps:
firstly, paving a polypropylene ultrafiltration membrane on the lower surface of a non-woven geotextile, then coating adhesive layer oil on the upper surface of the non-woven geotextile, spreading a deoxidizer, paving an activated carbon sponge on the upper surface of the non-woven geotextile, standing, and demulsifying to obtain a first product;
secondly, scattering polyaluminium chloride and titanium dioxide in gaps of the activated carbon sponge of the first product in sequence, and then scattering adhesive layer oil on the surface of the activated carbon sponge to obtain a second product;
spreading iron-carbon micro-electrolysis filler on the upper surface of the activated carbon sponge of the second product, filling gaps among the iron-carbon micro-electrolysis filler with silicate cement, and brushing adhesive oil on the surface of the micro-electrolysis filler of the sky-altar to obtain a third product;
and fourthly, coating the lower surface of the third product with the adhesive layer oil to obtain the product.
The invention also provides an application of the composition or the product obtained by the preparation method in a roadbed isolating layer for preventing heavy metal and/or inorganic salt pollutants from permeating.
In summary, the present invention provides a composition, which comprises the following raw materials: activated carbon sponge, iron-carbon micro-electrolysis filler, activated alumina, deoxidizer, polyaluminium chloride, titanium dioxide, portland cement, clay layer oil, non-woven geotextile and polypropylene ultrafiltration membrane. The invention also provides a preparation method of the composition, and application of the composition or a product obtained by the preparation method in a roadbed isolating layer for blocking permeation of heavy metal and/or inorganic salt pollutants. The product prepared by the technical scheme provided by the invention has good separation and purification effects, can effectively adsorb and degrade heavy metal elements, and can separate the seepage of inorganic salt pollutants; meanwhile, the method has the advantages of high purification efficiency, good durability, convenience in application and low cost, and is suitable for large-scale popularization and application. The composition, the preparation method and the application of the composition in the roadbed isolation layer solve the technical defects that the industrial waste is easy to cause environmental pollution and underground water pollution when being used as a roadbed filling material in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural view of a roadbed insulation product manufactured by the embodiment of the invention;
FIG. 2 is a schematic structural diagram of a leaching experiment performed in example 23 according to an embodiment of the present invention;
illustration of the drawings: 1. iron-carbon micro-electrolysis filler; 2. activated alumina particles; 3. ordinary portland cement; 4. polyaluminum chloride particles; 5. titanium dioxide; 6. a deoxidizing agent; 7. activated carbon sponge; 8. a polypropylene ultrafiltration membrane; 9. a non-woven geotextile.
Detailed Description
The embodiment of the invention provides a composition, a preparation method and application thereof in a roadbed isolation layer, which are used for solving the technical defects that in the prior art, when industrial waste is used as a roadbed filling material, environmental pollution and underground water pollution are easily caused.
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to illustrate the present invention in more detail, a composition, a preparation method and an application thereof in a roadbed isolation layer are specifically described in the following with reference to examples.
Example 1
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 130g/m of 2mm thick honeycomb-shaped activated carbon sponge210 mesh magnetite-based iron-carbon filler 200g/m230 mesh gamma type active alumina 160g/m2Sulfite 130g/m220g/m of polyaluminium chloride2Rutile type titanium dioxide 30g/m242.5# Portland Cement 50g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2150g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
The method for preparing the roadbed isolating layer by using the raw materials comprises the following steps:
(1) paving a polypropylene ultrafiltration membrane 8 on the lower surface of the non-woven geotextile 9, then uniformly brushing the adhesive layer oil on the upper surface of the non-woven geotextile 9, spreading a proper amount of deoxidizer 6 on the surface of the non-woven geotextile 9, placing an activated carbon sponge 7 on the upper surface of the non-woven geotextile 9, standing for 1h, and waiting for complete demulsification of the adhesive layer oil;
(2) the polyaluminium chloride particles 2 are uniformly spread in the activated carbon sponge 7 to be uniformly embedded in the pores of the activated carbon sponge 7, then the titanium dioxide 5 is filled in the residual pores, and a proper amount of adhesive layer oil is uniformly spread on the surface of the activated carbon sponge 7;
(3) spreading the iron-carbon micro-electrolysis filler 1 on the upper surface of the activated carbon sponge 7, filling large gaps of the activated carbon sponge with activated alumina particles 2, filling the gaps among the particles with common portland cement 3 serving as the filler, and painting appropriate viscous layer oil to complete material packaging;
(4) and coating a proper amount of binding oil on the lower surface of the roadbed isolation layer for preventing the heavy metal and inorganic salt pollutants from permeating, and then finishing the preparation.
The prepared product can be placed on a soil foundation, and then waste roadbed filling materials such as coal gangue, carbide slag, blast furnace slag and the like can be filled on the product.
Example 2
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m210 mesh magnetite-based iron-carbon filler 200g/m230 mesh gamma type active alumina 160g/m2Sulfite 130g/m220g/m of polyaluminium chloride2Rutile type titanium dioxide 30g/m242.5# Portland Cement 50g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2150g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 3
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 515g/m210 mesh magnetite-based iron-carbon filler 200g/m230 mesh gamma type active alumina 160g/m2Sulfite 130g/m220g/m of polyaluminium chloride2Rutile type titanium dioxide 30g/m242.5# Portland Cement 50g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2150g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 4
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m of 10-mesh magnetite-based iron-carbon filler230 mesh gamma type active alumina 160g/m2Sulfite 130g/m220g/m of polyaluminium chloride2Rutile type titanium dioxide 30g/m242.5# Portland Cement 50g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2150g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
The application method of the roadbed isolation layer for preventing the permeation of heavy metal and inorganic salt pollutants in this embodiment is the same as that in embodiment 1, and therefore, the detailed description thereof is omitted.
Example 5
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m210 mesh magnetite-based iron-carbon filler 350g/m230 mesh gamma type active alumina 160g/m2Sulfite 130g/m220g/m of polyaluminium chloride2Rutile type titanium dioxide 30g/m242.5# Portland Cement 50g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2150g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 6
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m of 10-mesh magnetite-based iron-carbon filler230 mesh gamma type activated alumina 180g/m2Sulfite 130g/m220g/m of polyaluminium chloride2Rutile type titanium dioxide 30g/m242.5# Portland Cement 50g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2150g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
The application method of the roadbed isolation layer for preventing the permeation of heavy metal and inorganic salt pollutants in this embodiment is the same as that in embodiment 1, and therefore, the detailed description thereof is omitted.
Example 7
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m of 10-mesh magnetite-based iron-carbon filler230 mesh gamma type active alumina 200g/m2Sulfite 130g/m220g/m of polyaluminium chloride2Rutile type titanium dioxide 30g/m242.5# Portland Cement 50g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2150g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 8
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m of 10-mesh magnetite-based iron-carbon filler230 mesh gamma type activated alumina 180g/m2Sulfite 180g/m220g/m of polyaluminium chloride2Rutile type titanium dioxide 30g/m242.5# Portland Cement 50g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2150g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 9
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m of 10-mesh magnetite-based iron-carbon filler230 mesh gamma type activated alumina 180g/m2Sulfite 220g/m220g/m of polyaluminium chloride2Rutile type titanium dioxide 30g/m242.5# Portland Cement 50g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2150g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 10
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m of 10-mesh magnetite-based iron-carbon filler230 mesh gamma type activated alumina 180g/m2Sulfite 180g/m230g/m of polyaluminium chloride2Rutile type titanium dioxide 30g/m242.5# Portland Cement 50g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2150g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 11
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m of 10-mesh magnetite-based iron-carbon filler230 mesh gamma type activated alumina 180g/m2Sulfite 180g/m240g/m of polyaluminium chloride2Rutile type titanium dioxide 30g/m242.5# Portland Cement 50g/m20.8kg of fast-cracking cation PC-3 type emulsified asphalt/m2150g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 12
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m of 10-mesh magnetite-based iron-carbon filler230 mesh gamma type activated alumina 180g/m2Sulfite 180g/m230g/m of polyaluminium chloride245g/m rutile type titanium dioxide242.5# Portland Cement 50g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2150g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 13
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m of 10-mesh magnetite-based iron-carbon filler230 mesh gamma type activated alumina 180g/m2Sulfite 180g/m230g/m of polyaluminium chloride260g/m rutile type titanium dioxide242.5# Portland Cement 50g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2150g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 14
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m of 10-mesh magnetite-based iron-carbon filler230 mesh gamma type activated alumina 180g/m2Sulfite 180g/m230g/m of polyaluminium chloride245g/m rutile type titanium dioxide242.5# Portland Cement 100g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2150g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 15
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m of 10-mesh magnetite-based iron-carbon filler230 mesh gamma type activated alumina 180g/m2Sulfite 180g/m230g/m of polyaluminium chloride245g/m rutile type titanium dioxide242.5# Portland Cement 100g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2200g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 16
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m of 10-mesh magnetite-based iron-carbon filler230 mesh gamma type activated alumina 180g/m2Sulfite 180g/m230g/m of polyaluminium chloride245g/m rutile type titanium dioxide242.5# Portland Cement 100g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2250g/m of nonwoven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 17
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m of 20-mesh magnetite-based iron-carbon filler230 mesh gamma type activated alumina 180g/m2Sulfite 180g/m230g/m of polyaluminium chloride245g/m rutile type titanium dioxide242.5# Portland Cement 100g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2250g/m of nonwoven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 18
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m iron-carbon filler of 20 ocular iron ore series230 mesh X-rho type active alumina 180g/m2Sulfite 180g/m230g/m of polyaluminium chloride2Anatase titanium dioxide 45g/m242.5# Portland Cement 100g/m2Fast-cracking anion PA-3 type emulsified asphalt 0.8kg/m2200g/m of non-woven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 19
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 380g/m2275g/m of 20-mesh fine iron powder series iron-carbon filler230 mesh X-rho type active alumina 180g/m2Sulfite 180g/m230g/m of polyaluminium chloride2Anatase titanium dioxide 45g/m242.5# Portland Cement 100g/m2Fast-cracking anion PA-3 type emulsified asphalt 0.8kg/m2250g/m of nonwoven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 20
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 515g/m220 mesh magnetite-based iron-carbon filler 350g/m230 mesh gamma type active alumina 200g/m2220g/m of reduced iron powder240g/m of polyaluminium chloride260g/m rutile type titanium dioxide242.5# Portland Cement 100g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2300g/m of nonwoven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 21
A roadbed isolation layer capable of blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 515g/m220 ocular iron ore series iron-carbon filler 350g/m230-mesh X-rho type active alumina 200g/m2220g/m of reduced iron powder240g/m of polyaluminium chloride260g/m anatase titanium dioxide242.5# Portland Cement 100g/m2Fast-cracking cation PA-3 type emulsified asphalt 0.8kg/m2300g/m of nonwoven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Example 22
Heavy metal and inorganic materials with separation functionThe salt pollutant permeable roadbed isolating layer is prepared by mixing the following raw materials in parts by mass: 2mm thick honeycomb-shaped active carbon sponge 515g/m220-mesh fine iron powder series iron-carbon filler 350g/m230-mesh X-rho type active alumina 200g/m2220g/m of reduced iron powder240g/m of polyaluminium chloride260g/m anatase titanium dioxide242.5# Portland Cement 100g/m2Fast-cracking cation PA-3 type emulsified asphalt 0.8kg/m2300g/m of nonwoven geotextile222g/m polypropylene ultrafiltration membrane2。
In this embodiment, the method for preparing the roadbed isolation layer by using the above raw materials is the same as that in embodiment 1, and is not described herein again.
Comparative example 1
A roadbed isolation layer for blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: foamed plastic polymer sponge 515g/m with thickness of 2mm220 mesh magnetite-based iron-carbon filler 350g/m230 mesh gamma type active alumina 200g/m2220g/m of reduced iron powder240g/m of polyaluminium chloride260g/m rutile type titanium dioxide242.5# Portland Cement 100g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2300g/m of nonwoven geotextile222g/m polypropylene ultrafiltration membrane2。
Comparative example 2
A roadbed isolation layer for blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: foamed plastic polymer sponge 515g/m with thickness of 2mm230 mesh gamma type active alumina 200g/m2220g/m of reduced iron powder240g/m of polyaluminium chloride260g/m rutile type titanium dioxide242.5# Portland Cement 100g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2300g/m of nonwoven geotextile222g/m polypropylene ultrafiltration membrane2。
Comparative example 3
A roadbed isolation layer for blocking permeation of heavy metal and inorganic salt pollutants comprises the following components in parts by massMixing the raw materials to prepare: foamed plastic polymer sponge 515g/m with thickness of 2mm220 mesh magnetite-based iron-carbon filler 350g/m2220g/m of reduced iron powder240g/m of polyaluminium chloride260g/m rutile type titanium dioxide242.5# Portland Cement 100g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2300g/m of nonwoven geotextile222g/m polypropylene ultrafiltration membrane2。
Comparative example 4
A roadbed isolation layer for blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: foamed plastic polymer sponge 515g/m with thickness of 2mm220 mesh magnetite-based iron-carbon filler 350g/m230 mesh gamma type active alumina 200g/m240g/m of polyaluminium chloride260g/m rutile type titanium dioxide242.5# Portland Cement 100g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2300g/m of nonwoven geotextile222g/m polypropylene ultrafiltration membrane2。
Comparative example 5
A roadbed isolation layer for blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: foamed plastic polymer sponge 515g/m with thickness of 2mm240g/m of polyaluminium chloride260g/m rutile type titanium dioxide242.5# Portland Cement 100g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2300g/m of nonwoven geotextile222g/m polypropylene ultrafiltration membrane2。
Comparative example 6
A roadbed isolation layer for blocking permeation of heavy metal and inorganic salt pollutants is prepared by mixing the following raw materials in parts by mass: foamed plastic polymer sponge 515g/m with thickness of 2mm242.5# Portland Cement 100g/m2Fast-cracking cation PC-3 type emulsified asphalt 0.8kg/m2300g/m of nonwoven geotextile2。
In comparative examples 1 to 6, the preparation method of each control is referred to the preparation method of the roadbed isolation layer commonly used in the field, and is not described herein again.
Example 23
This example is a specific example of performing a dynamic leaching experiment on the products prepared in examples 1 to 22 and comparative examples 1 to 6.
In the embodiment, the coal gangue is used as a roadbed filling material, the surface layer weathered mixed coal gangue is selected from coal gangue samples, the time of exposure to the external environment is approximately more than 1 year, the surface of the sample is weakly acidic, and the pH value is 6.1-6.7.
The coal gangue is crushed into sample particles with the particle size of less than or equal to 15mm, and the sample particles are used for a dynamic leaching experiment. The dynamic leaching test of the coal gangue comprises the following steps: two layers of quantitative filter paper are laid at the bottom of the 1L barrel type separating funnel, and after the coal gangue sample is put in, the coal gangue sample is gently shaken to reduce gaps among the coal gangue. Slowly dripping deionized water by using a BT-100 constant flow pump, wherein the dripping speed is 8.2-8.5 mL/min. And opening a funnel valve while adding water, receiving the water by using a conical flask, filtering and detecting. Deionized water is continuously added dropwise for 1 hour each time, the water amount is about 500mL, and then the mixture is kept still for 2 hours. The cycle was continued 8 times. After leaching is finished, detecting metals (Zn, Mn, Cu, Fe and Al) and acid radical ions (NO) in the coal gangue leaching solution-3). Wherein, the thickness ratio of the coal gangue road base layer to the road base isolation layer is 3: 1.
In this embodiment, the structural schematic diagram of the leaching experiment can further refer to fig. 2 in the specification.
The experimental results obtained are shown in tables 1 to 3.
Table 1 examples 1-9 natural precipitation leaching test results
Table 2 examples 11-19 results of the leaching test with natural rainfall
TABLE 3 results of leaching test with natural rainfall in examples 20-22 and comparative examples 1-6
Remarking: and when the leaching test is carried out on the comparative example, roadbed filling (mainly clay material) with corresponding thickness is filled at the position of the roadbed isolation layer.
From the above-mentioned examples and comparative examples, it can be seen that the roadbed isolation layer prepared by the technical scheme provided by the invention has good blocking and purifying effects on leaching heavy metal elements and nitrates of coal gangue.
Compared with the comparative example 1, the contents of heavy metal elements and inorganic salts in water passing through the roadbed isolation layer are greatly reduced, and the roadbed isolation layer has good effects of isolating, purifying and controlling the exudate pollution of underground water when the roadbed is filled with wastes.
As can be seen from the analysis of comparative examples 1 to 6, when each of the components lacks one component, the blocking and purifying effects of the heavy metal elements and the nitrates are reduced to some extent, and when the honeycomb-shaped porous activated carbon sponge, the magnetite-based iron carbon filler, the activated alumina and the reduced iron powder are all missing, the blocking and purifying effects of the heavy metal elements and the nitrates are basically lost in the comparative examples, which is substantially consistent with the data related to comparative example 6.
According to the technical scheme, the composition, the preparation method and the application of the composition in the roadbed isolation layer have the following advantages:
1. the product prepared by the invention has a roadbed isolating layer with a three-level purification net for isolating heavy metal and inorganic salt pollutants from permeating, which is the first time at home and abroad, and no relevant report is found at home and abroad at present.
2. In the invention, activated carbon sponge is used as a purification carrier, iron-carbon micro-electrolysis filler, activated alumina particles and deoxidizer are used as main components, titanium dioxide is used as an auxiliary purification component, non-woven geotextile and a polypropylene ultrafiltration membrane are used as a particle filtration anti-leakage layer, the iron-carbon micro-electrolysis filler absorbs heavy metal dissolved pollutants to the periphery of the iron-carbon micro-electrolysis filler through the micro-electrical property of the surface of the iron-carbon micro-electrolysis filler, the active alumina particles dispersed around the active alumina particles form a secondary product with more stability and low pollution through the chemical oxidation catalysis of heavy metal pollution elements, meanwhile, the iron-carbon micro-electrolysis filler can form a charge control matrix with the activated alumina particles through the microelectrode effect of the filler, an isolation interval net for metal pollution elements is formed by transferring and allocating charges, so that a primary purification net for pollutants is realized.
3. In the invention, the activated carbon sponge layer can adsorb partial pollutants in the micropore structure of the activated carbon sponge layer through the porous property of the activated carbon sponge layer, titanium dioxide which is pre-filled in the micropores of the activated carbon sponge layer is used as a catalytic component, and the titanium-polyaluminium chloride which is another component forms a titanium-polyaluminium purification net, inorganic salt pollutants such as nitrate in the titanium-polyaluminium purification net are catalytically decomposed into salt components with low pollution degree, so that the concentration of the pollutants contained in the eluvial water is reduced, meanwhile, the activated carbon particles not only can provide carriers for the titanium-polyaluminium purification net, but also can realize the adsorption and fixation of the pollution components, and form a secondary purification net together with the titanium-polyaluminium purification net.
4. According to the invention, a three-level purification network is formed by the deoxidizer and the polypropylene ultrafiltration membrane, part of components in the pollutants are deoxidized by the deoxidizer through the special deoxidization property of the deoxidizer, then the deoxidization and ultra-purification of the residual inorganic salt pollutants in the eluvial water are realized through the ultra-purification membrane effect of the polypropylene ultrafiltration membrane, finally the purification treatment of leaching and water seepage of industrial waste such as coal gangue, slag, carbide slag and the like is realized, and finally the infiltrated particle pollutants are intercepted by adopting the non-woven geotextile, so that the sinking of the pollutants and the loss of an isolation layer material are reduced.
In summary, the present invention provides a composition, which comprises the following raw materials: activated carbon sponge, iron-carbon micro-electrolysis filler, activated alumina, deoxidizer, polyaluminium chloride, titanium dioxide, portland cement, clay layer oil, non-woven geotextile and polypropylene ultrafiltration membrane. The invention also provides a preparation method of the composition, and application of the composition or a product obtained by the preparation method in a roadbed isolating layer for blocking permeation of heavy metal and/or inorganic salt pollutants. The product prepared by the technical scheme provided by the invention has good separation and purification effects, can effectively adsorb and degrade heavy metal elements, and can separate the seepage of inorganic salt pollutants; meanwhile, the method has the advantages of high purification efficiency, good durability, convenience in application and low cost, and is suitable for large-scale popularization and application. The composition, the preparation method and the application of the composition in the roadbed isolation layer solve the technical defects that the industrial waste is easy to cause environmental pollution and underground water pollution when being used as a roadbed filling material in the prior art.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (13)
1. A composition for a roadbed barrier, wherein the composition comprises the following raw materials: activated carbon sponge, iron-carbon micro-electrolysis filler, activated alumina, deoxidizer, polyaluminium chloride, titanium dioxide, portland cement, bond coat oil, non-woven geotextile and polypropylene ultrafiltration membrane;
the activated carbon sponge, the iron-carbon micro-electrolysis filler, the activated alumina particles and the portland cement form a first-stage purification net, the activated carbon sponge, the titanium dioxide and the polyaluminium chloride form a second-stage purification net, the deoxidizer and the polypropylene ultrafiltration membrane form a third-stage purification net, and the non-woven geotextile and the polypropylene ultrafiltration membrane are used as a particle filtration anti-leakage layer.
2. The composition according to claim 1, wherein the composition comprises the following raw materials in parts by mass: 130-515 parts of activated carbon sponge, 200-350 parts of iron-carbon micro-electrolysis filler, 160-200 parts of activated alumina, 130-220 parts of deoxidizer, 20-40 parts of polyaluminium chloride, 30-60 parts of titanium dioxide, 50-100 parts of Portland cement, 800 parts of binding oil, 100-300 parts of non-woven geotextile and 22 parts of polypropylene ultrafiltration membrane.
3. The composition according to claim 1, wherein the composition comprises the following raw materials in parts by mass: 320 parts of activated carbon sponge, 280 parts of iron-carbon micro-electrolysis filler, 190 parts of activated alumina, 180 parts of deoxidizer, 30 parts of polyaluminium chloride, 40 parts of titanium dioxide, 70 parts of Portland cement, 800 parts of binding oil, 200 parts of non-woven geotextile and 22 parts of polypropylene ultrafiltration membrane.
4. The composition as claimed in any one of claims 1 to 3, wherein the activated carbon sponge is honeycomb-shaped porous activated carbon, and the thickness of the activated carbon sponge is 2 to 8 mm;
the carbon content of the activated carbon sponge is more than 50%, and the benzene adsorption rate of the activated carbon sponge is more than 90%.
5. The composition according to any one of claims 1 to 3, characterized in that the iron-carbon microelectrolytic filler is chosen from: the iron-carbon microelectrolysis filler is in a granular structure, and the particle size of the iron-carbon microelectrolysis filler is 10-20 meshes;
the iron content of the iron-carbon micro-electrolysis filler is more than 55%, the carbon content of the iron-carbon micro-electrolysis filler is more than 10%, the porosity of the iron-carbon micro-electrolysis filler is more than 45%, the wear rate of the iron-carbon micro-electrolysis filler is less than 0.04%, and the breakage rate of the iron-carbon micro-electrolysis filler is less than 0.05%.
6. A composition according to any one of claims 1 to 3, characterized in that the activated alumina is: gamma-activated alumina and/or X-rho activated alumina, wherein the particle size of the activated alumina is 30 meshes.
7. The composition according to any one of claims 1 to 3, wherein the deoxidizer is a sulfite and/or a reduced iron powder, and the particle size of the deoxidizer is 20 mesh.
8. The composition as claimed in any one of claims 1 to 3, wherein the polyaluminium chloride is water treatment grade polyaluminium chloride, and the particle size of the polyaluminium chloride is 200 meshes.
9. The composition according to any one of claims 1 to 3, wherein the titanium dioxide is titanium dioxide of titanium removal type and/or rutile type, and the particle size of the titanium dioxide is 200 meshes.
10. The composition as claimed in any one of claims 1 to 3, wherein the layer-sticking oil is a fast-cracking cationic PC-3 type emulsified asphalt and/or a fast-cracking anionic PA-3 type emulsified asphalt.
11. The composition according to any one of claims 1 to 3, wherein the nonwoven geotextile is a needle-punched geotextile, the nonwoven geotextile having a thickness of 1.9 mm;
the wall thickness of the polypropylene ultrafiltration membrane is 50 mu m, and the molecular weight cut-off of the polypropylene ultrafiltration membrane is 5-10 ten thousand.
12. A process for the preparation of a composition comprising any one of claims 1 to 11, wherein the process comprises:
firstly, paving a polypropylene ultrafiltration membrane on the lower surface of a non-woven geotextile, then coating adhesive layer oil on the upper surface of the non-woven geotextile, spreading a deoxidizer, paving an activated carbon sponge on the upper surface of the non-woven geotextile, standing, and demulsifying to obtain a first product;
secondly, scattering polyaluminium chloride and titanium dioxide in gaps of the activated carbon sponge of the first product in sequence, and then scattering adhesive layer oil on the surface of the activated carbon sponge to obtain a second product;
spreading iron-carbon micro-electrolysis filler on the upper surface of the activated carbon sponge of the second product, filling gaps among the iron-carbon micro-electrolysis filler with silicate cement, and brushing adhesive oil on the surface of the iron-carbon micro-electrolysis filler to obtain a third product;
and fourthly, coating the lower surface of the third product with the adhesive layer oil to obtain the product.
13. Use of a composition according to any one of claims 1 to 11 or a product obtained by the preparation method according to claim 12 for a roadbed barrier against the penetration of heavy metal and/or inorganic salt contaminants.
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