CN114133170A - Pit backfill material, preparation method and application thereof - Google Patents
Pit backfill material, preparation method and application thereof Download PDFInfo
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- CN114133170A CN114133170A CN202111398761.3A CN202111398761A CN114133170A CN 114133170 A CN114133170 A CN 114133170A CN 202111398761 A CN202111398761 A CN 202111398761A CN 114133170 A CN114133170 A CN 114133170A
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- backfill material
- pit backfill
- solid waste
- water
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- 239000000463 material Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title abstract description 20
- 239000002910 solid waste Substances 0.000 claims abstract description 34
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000002994 raw material Substances 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 25
- 239000004568 cement Substances 0.000 claims abstract description 20
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 20
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 19
- 238000001354 calcination Methods 0.000 claims abstract description 19
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 19
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 17
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 17
- 230000036571 hydration Effects 0.000 claims abstract description 13
- 238000006703 hydration reaction Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 238000010298 pulverizing process Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims abstract description 6
- 239000002893 slag Substances 0.000 claims description 10
- 230000033558 biomineral tissue development Effects 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 239000010881 fly ash Substances 0.000 claims description 5
- 229910052602 gypsum Inorganic materials 0.000 claims description 5
- 239000010440 gypsum Substances 0.000 claims description 5
- 230000001089 mineralizing effect Effects 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 5
- 238000009270 solid waste treatment Methods 0.000 claims description 3
- 230000008439 repair process Effects 0.000 claims description 2
- 239000002440 industrial waste Substances 0.000 abstract description 5
- 239000003245 coal Substances 0.000 abstract description 3
- 239000000945 filler Substances 0.000 abstract 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000002411 thermogravimetry Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 230000004580 weight loss 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
- C04B18/0445—Synthetic gypsum, e.g. phosphogypsum
-
- 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
- C04B18/0481—Other specific industrial waste materials not provided for elsewhere in C04B18/00
-
- 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
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/20—Sulfonated aromatic compounds
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2623—Polyvinylalcohols; Polyvinylacetates
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
-
- 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
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- 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)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Combustion & Propulsion (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a pit backfill material, a preparation method and application thereof, wherein the pit backfill material is prepared from the following raw materials in parts by weight: 25-30 parts of industrial solid waste, 210 parts of water 170-sodium dodecyl benzene sulfonate, 1-3 parts of polyvinyl alcohol and 8-12 parts of cement. The preparation method comprises the following steps: s1, carrying out pulverization treatment on industrial solid waste; s2, carrying out hydration calcination on the raw material obtained in the step S1 and part of water; s3, stirring the sample obtained in the step S2 with sodium dodecyl benzene sulfonate, polyvinyl alcohol and the residual amount of water to form slurry, and injecting carbon dioxide to mineralize; and S4, mixing the mineralized sample obtained in the step S3 with cement to obtain the mineral water. The filler can be used for backfilling coal pits, reduces backfilling cost, and has the double advantages of reducing carbon dioxide emission and solving the problem of industrial waste emission.
Description
Technical Field
The invention relates to the technical field of industrial solid waste treatment, in particular to a pit backfill material, a preparation method and application thereof.
Background
With the progress of global industrialization, the excessive use of fossil fuels leads to large greenhouse gas emissions such as carbon dioxide, methane, and the like. Wherein the CO in the atmosphere is increased2The influence of concentration on global warming is the largest, and extreme weather and environmental disasters such as flood, drought, sea level rise and the like are brought. In order to achieve carbon dioxide emission reduction, new energy sources are being developed to replace fossil energy by using energy sources including solar energy, wind energy and hydrogen energy, but the new energy sources are still difficult to achieve in a short term. Thus CO2The capture and the sequestration are the main paths of carbon emission reduction at present.
CO2Mineralization (carbonation) is the process of simulating accelerated natural weathering of rock, CO2The calcium carbonate and the magnesium carbonate are generated by the reaction with calcium, magnesium and the like to realize permanent sealing. The solid wastes such as industrial blast furnace slag, carbide slag, waste gypsum, fly ash and the like can be used for CO2And (5) mineralizing and sealing. The industrial solid waste has large annual discharge amount, such as 26Mt, 220Mt and 1000Mt of carbide slag, waste gypsum and fly ash respectively, is widely distributed, is difficult to treat, has the problems of local water source pollution and the like, and is another problem in the current industrial production.
After underground coal mining is finished, a large pit is left, natural disasters such as collapse, water and soil loss and the like are easily caused, and adverse effects are caused on the local ecological environment and human social life.
It is of great significance to find effective technical means for solving the above environmental problems.
Disclosure of Invention
The invention aims to provide a pit backfill material and a preparation method thereof, the pit backfill material is prepared by taking alkaline solid waste as a raw material and mixing a product obtained after carbonation reaction of the solid waste and cement, can be used for backfilling a coal pit, reduces backfilling cost, and has the double advantages of reducing carbon dioxide emission and solving the problem of industrial waste emission.
In order to achieve the purpose, the invention adopts the following technical scheme:
a pit backfill material is composed of the following raw materials in parts by weight:
25-30 parts of industrial solid waste, 210 parts of water 170-sodium dodecyl benzene sulfonate, 1-3 parts of polyvinyl alcohol and 8-12 parts of cement.
Preferably, the backfill material consists of the following raw materials in parts by weight:
26-29 parts of industrial solid waste, 205 parts of water 165-containing materials, 1.8-2.8 parts of sodium dodecyl benzene sulfonate, 1.5-4.5 parts of polyvinyl alcohol and 8.5-11 parts of cement.
Preferably, the industrial solid waste is at least one of industrial blast furnace slag, carbide slag, waste gypsum and fly ash.
The invention also provides a preparation method of the pit backfill material, which comprises the following steps:
s1, carrying out pulverization treatment on industrial solid waste to obtain a raw material;
s2, carrying out hydration calcination on the raw material obtained in the step S1 and part of water to obtain a sample;
s3, stirring the sample obtained in the step S2 with sodium dodecyl benzene sulfonate, polyvinyl alcohol and the residual amount of water to form slurry, and injecting carbon dioxide to mineralize to obtain a mineralized sample;
and S4, mixing the mineralized sample obtained in the step S3 with cement to obtain the pit backfill material.
Preferably, the particle size of the raw material in step S1 is 20-400 microns.
Preferably, the treatment conditions of the hydration calcination in step S2 are: stirring for 2-5h at 25-50 ℃, drying, and calcining for 1-3h at 400-800 ℃.
Preferably, the conditions of the mineralization in step S3 are: 30-100% CO2Injecting and mineralizing for 5-10 h.
The invention also provides application of the pit backfill material or the preparation method in carbon emission reduction.
The invention also provides application of the pit backfill material or the preparation method in industrial solid waste treatment.
The invention also provides application of the pit backfill material in pit backfill repair.
The invention has the beneficial effects that:
according to the invention, through pretreatment such as pulverization, hydration and calcination, sodium dodecyl benzene sulfonate is added, the extraction rate of calcium, magnesium and other ions in solid waste is improved by polyvinyl alcohol, so that the mineralization efficiency of carbon dioxide is improved, and a mineralized sample reacts with cement to form a stable backfill material which can be used for pit backfill. Compared with the prior art, the invention has low backfill cost and has the double advantages of reducing carbon dioxide emission and solving the problem of industrial waste emission.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention are further described below.
When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The sources of the raw materials are not particularly limited in the present invention, and the raw materials used in the present invention are all common commercial products unless otherwise specified. The industrial solid waste is alkaline industrial waste gas, specifically at least one of industrial blast furnace slag, carbide slag, waste gypsum and fly ash, and in the embodiment, the industrial solid waste is carbide slag; the concentration of carbon dioxide in the examples is volume percent.
Example 1 pit backfill material and preparation method thereof
A pit backfill material is composed of the following raw materials in parts by weight:
25 parts of industrial solid waste, 170 parts of water, 1 part of sodium dodecyl benzene sulfonate, 1 part of polyvinyl alcohol and 8 parts of cement.
The preparation method of the pit backfill material comprises the following steps:
s1, carrying out pulverization treatment on industrial solid waste to obtain a raw material with the particle size of 20 microns;
s2, carrying out hydration calcination on the raw material obtained in the step S1 and 100 parts of water to obtain a sample;
the treatment conditions of the hydration calcination are as follows: stirring at 25 deg.C for 5h, drying, and calcining at 400 deg.C for 3 h;
s3, stirring the sample obtained in the step S2 with sodium dodecyl benzene sulfonate, polyvinyl alcohol and the residual amount of water to form slurry, injecting 30% carbon dioxide, and carrying out mineralization reaction for 10 hours to obtain a mineralized sample;
and S4, mixing the mineralized sample obtained in the step S3 with cement to obtain the pit backfill material.
Embodiment 2 pit backfill material and preparation method thereof
A pit backfill material is composed of the following raw materials in parts by weight:
30 parts of industrial solid waste, 210 parts of water, 3 parts of sodium dodecyl benzene sulfonate, 5 parts of polyvinyl alcohol and 12 parts of cement.
The preparation method of the pit backfill material comprises the following steps:
s1, carrying out pulverization treatment on industrial solid waste to obtain a raw material with the particle size of 400 microns;
s2, carrying out hydration calcination on the raw material obtained in the step S1 and 120 parts of water to obtain a sample;
the treatment conditions of the hydration calcination are as follows: stirring for 2h at 50 ℃, drying, and calcining for 1h at 800 ℃;
s3, stirring the sample obtained in the step S2 with sodium dodecyl benzene sulfonate, polyvinyl alcohol and the residual amount of water to form slurry, injecting 100% carbon dioxide, and carrying out mineralization reaction for 5 hours to obtain a mineralized sample;
and S4, mixing the mineralized sample obtained in the step S3 with cement to obtain the pit backfill material.
Embodiment 3 pit backfill material and preparation method thereof
A pit backfill material is composed of the following raw materials in parts by weight:
29 parts of industrial solid waste, 200 parts of water, 2 parts of sodium dodecyl benzene sulfonate, 3 parts of polyvinyl alcohol and 9 parts of cement.
The preparation method of the pit backfill material comprises the following steps:
s1, carrying out pulverization treatment on industrial solid waste to obtain a raw material with the particle size of 100 microns;
s2, carrying out hydration calcination on the raw material obtained in the step S1 and 115 parts of water to obtain a sample;
the treatment conditions of the hydration calcination are as follows: stirring for 3h at 30 ℃, drying, and calcining for 2h at 600 ℃;
s3, stirring the sample obtained in the step S2 with sodium dodecyl benzene sulfonate, polyvinyl alcohol and the residual amount of water to form slurry, injecting 80% carbon dioxide, and carrying out mineralization reaction for 7 hours to obtain a mineralized sample;
and S4, mixing the mineralized sample obtained in the step S3 with cement to obtain the pit backfill material.
Embodiment 4 pit backfill material and preparation method thereof
This example differs from example 3 in that:
a pit backfill material is composed of the following raw materials in parts by weight:
26 parts of industrial solid waste, 165 parts of water, 1.8 parts of sodium dodecyl benzene sulfonate, 1.5 parts of polyvinyl alcohol and 8.5 parts of cement.
Example 5 pit backfill material and preparation method thereof
This example differs from example 3 in that:
a pit backfill material is composed of the following raw materials in parts by weight:
28 parts of industrial solid waste, 205 parts of water, 2.8 parts of sodium dodecyl benzene sulfonate, 4.5 parts of polyvinyl alcohol and 11 parts of cement.
Comparative example 1 pit backfill material and preparation method thereof
The difference between the comparative example and the example 3 is that sodium humate is adopted to replace sodium dodecyl benzene sulfonate;
in the preparation method, the calcining temperature is 850 ℃; the mineralization conditions were: 20% CO2Injecting and mineralizing for 16 h.
Comparative example 2 pit backfill material and preparation method thereof
The difference between the comparative example and the example 3 is that the pit backfill material consists of the following raw materials in parts by weight:
29 parts of industrial solid waste, 200 parts of water, 3 parts of sodium dodecyl benzene sulfonate, 1 part of polyvinyl alcohol and 10 parts of cement.
First, industrial solid waste and carbon fixation rate
According to the thermogravimetric analysis method, the solid carbon rate of the industrial solid waste is measured, and CO corresponding to the solid waste raw material and the mineralized solid phase product is respectively measured2The weight loss rate and the carbon fixation rate of industrial solid waste can be calculated according to a formula:
in the formula etaCO2Carbon dioxide absorption rate of solid waste,%;
mCO2for mineralizing CO fixed in solid waste2Mass of (c), g;
mrmmass of raw materials, g;
w2for absorbing CO after reaction of carbon dioxide2Weight loss ratio,%;
w1for corresponding CO in solid waste raw material2Weight loss ratio,%.
The results of the performance tests are shown in table 1.
TABLE 1
Second, detecting the performance of backfill materials in the pit
The pit backfill prepared according to examples 1-5 and comparative examples 1-2 of the present invention were tested for properties according to the compressive strength test method, and the results are shown in table 2.
TABLE 2
In conclusion, the invention improves the extraction rate of calcium, magnesium and other ions in solid waste by pretreatment such as pulverization, hydration calcination and the like, and by adding sodium dodecyl benzene sulfonate and polyvinyl alcohol, the mineralization efficiency of carbon dioxide is improved, and a mineralized sample reacts with cement to form a stable backfill material which can be used for pit backfill. Compared with the prior art, the invention has low backfill cost and has the double advantages of reducing carbon dioxide emission and solving the problem of industrial waste emission.
The present invention has been further described with reference to specific embodiments, which are only exemplary and do not limit the scope of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. The pit backfill material is characterized by comprising the following raw materials in parts by weight:
25-30 parts of industrial solid waste, 210 parts of water 170-sodium dodecyl benzene sulfonate, 1-3 parts of polyvinyl alcohol and 8-12 parts of cement.
2. The pit backfill material according to claim 1, characterized by comprising the following raw materials in parts by weight:
26-29 parts of industrial solid waste, 205 parts of water 165-containing materials, 1.8-2.8 parts of sodium dodecyl benzene sulfonate, 1.5-4.5 parts of polyvinyl alcohol and 8.5-11 parts of cement.
3. The pit backfill material according to claim 1, wherein the industrial solid waste is at least one of industrial blast furnace slag, carbide slag, waste gypsum and fly ash.
4. A method of preparing pit backfill material according to any one of claims 1-3, including the steps of:
s1, carrying out pulverization treatment on industrial solid waste to obtain a raw material;
s2, carrying out hydration calcination on the raw material obtained in the step S1 and part of water to obtain a sample;
s3, stirring the sample obtained in the step S2 with sodium dodecyl benzene sulfonate, polyvinyl alcohol and the residual amount of water to form slurry, and injecting carbon dioxide to mineralize to obtain a mineralized sample;
and S4, mixing the mineralized sample obtained in the step S3 with cement to obtain the pit backfill material.
5. The method according to claim 4, wherein the particle size of the raw material in step S1 is 20 to 400 μm.
6. The method according to claim 4, wherein the treatment conditions of the hydration calcination in the step S2 are: stirring for 2-5h at 25-50 ℃, drying, and calcining for 1-3h at 400-800 ℃.
7. The method according to claim 4, wherein the mineralization in step S3 is carried out under the following conditions: 30-100% CO2Injecting and mineralizing for 5-10 h.
8. Use of a pit backfill material according to any one of claims 1-3 for carbon cutback.
9. Use of a pit backfill material according to any one of claims 1-3 in pit backfill repair.
10. Use of a pit backfill material according to any one of claims 1-3 in industrial solid waste treatment.
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