CN112852073A - Preparation method of argillized gangue curing agent - Google Patents
Preparation method of argillized gangue curing agent Download PDFInfo
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- CN112852073A CN112852073A CN202110289514.3A CN202110289514A CN112852073A CN 112852073 A CN112852073 A CN 112852073A CN 202110289514 A CN202110289514 A CN 202110289514A CN 112852073 A CN112852073 A CN 112852073A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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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
- C04B28/001—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 unburned clay
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
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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
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
- C04B2111/00775—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes the composition being used as waste barriers or the like, e.g. compositions used for waste disposal purposes only, but not containing the waste itself
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- Chemical Kinetics & Catalysis (AREA)
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- Engineering & Computer Science (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention relates to the field of soft rock engineering, in particular to a argillization waste rock curing agent which comprises 12-27 parts by weight of nano bentonite and 73-88 parts by weight of high polymer water-absorbent resin, and application of the argillization waste rock curing agent in argillization waste rock treatment of a water-rich soft rock shaft. The high-molecular water-absorbing resin and the nano bentonite are mixed and applied to the treatment of the muddy waste rock of the water-rich soft rock shaft for the first time, the optimal mixing ratio is determined through indoor tests and field industrial tests, scientific data are provided for the treatment of the muddy waste rock of the water-rich soft rock shaft, and the method has important engineering application value. The new technology improves the operation environment and obviously improves the gangue discharge speed.
Description
Technical Field
The invention relates to the field of soft rock engineering, in particular to a preparation method of a argillization gangue curing agent.
Background
In the engineering construction process, a large amount of accumulated water is generated in the working procedures of excavation, water spraying and the like, and the waste rock is rapidly disintegrated in a argillization mode when meeting water, so that the waste rock discharge cannot be smoothly carried out, the heading machine is difficult to advance, and the heading speed is greatly reduced.
The common treatment methods for treating the argillized gangue in the engineering treatment at present comprise a sedimentation tank method, a flocculation treatment method, an equipment treatment method and the like. The sedimentation tank method is that a waste residue sedimentation tank is arranged on the site, and waste residue is naturally dried by a tank car and then transported to a garbage site. Has the disadvantages of high cost, low efficiency, easy generation of 'dripping, scattering, leaking' and the like, and is easy to generate secondary pollution. The equipment treatment method is to adopt a horizontal centrifuge to carry out dehydration treatment on the argillized gangue, carry out outward transportation treatment on mud cakes and recycle wastewater, and has the defects of complex treatment process, high cost, large occupied area and the like. The flocculation treatment method is that a flocculating agent is added into the argillized gangue, the muddy water is a suspension liquid containing a certain amount of fine muddy particles in water, the flocculating agent is a water-soluble high polymer, and when the flocculating agent is mixed with the muddy water, the flocculating agent has the functions of bridging, net catching, adsorption, electric neutralization and the like, so that the stability of the muddy water can be damaged, the muddy particles are coagulated and settled from the water, and the muddy water separation effect is achieved. But the curing process is complex, the curing speed is slow, and the cured slurry is not easy to be recycled.
In addition, temporary internal construction access roads need to be built on the construction site, earth and stone are purchased outside, the construction access roads need to be dismantled and abandoned outside after construction is finished, and the outside transportation cost and the abandonment cost are also needed. If the shaft argillization gangue is directly subjected to water absorption treatment, the earthwork outsourcing and abandonment cost of the same amount of earthwork can be reduced.
Disclosure of Invention
The invention aims to solve the technical problems that a muddy gangue curing agent and a method for rapidly reducing water in rich muddy gangue by using the muddy gangue curing agent are provided, the consistency of the rich muddy gangue is increased, the problems that the gangue discharge is difficult or even can not be realized due to the fact that the water content of the rich muddy gangue is too large are solved, the working strength of workers is reduced, the gangue discharge speed is accelerated, the tunneling construction progress is accelerated, compared with other conventional water-absorbing materials, a large amount of funds and labor force are saved, and the economic benefit is considerable.
The present invention is thus achieved.
The invention firstly provides a argillized gangue curing agent which comprises the following components in parts by weight: 12-27 parts of nano bentonite and 73-88 parts of high polymer water-absorbent resin.
The high-molecular water-absorbent resin material is white powder at normal temperature, and has different varieties and different thickness degrees. Generally can absorb hundreds times or even thousands times of water of the mass of the super absorbent polymer, and has strong water retention capacity, so the super absorbent polymer is also called as super absorbent or high water retention agent. In terms of chemical structure, the high molecular water-absorbent resin is a low crosslinking degree or a partially crystalline high molecular polymer having many hydrophilic groups. The calculation formula of the mass water absorption of the material is as follows.
Wm=(mb-mg)/mg×100%。
In the formula: wmMass water absorption,%; m isbG is the mass of the sample after saturation; m isgDry mass of sample, g.
The bentonite is a natural inorganic material, does not undergo an aging reaction, has good durability, is nontoxic and corrosion-free, and is a green and environment-friendly material. The material has strong hygroscopicity and expansibility, can adsorb water with volume being 8-15 times of that of the material, and has volume expansion being several times to 30 times; can be dispersed into a gelatinous state and a suspended state in an aqueous medium, and the medium solution has certain viscosity, denaturation and lubricity; has stronger cation exchange capacity; the adsorption capacity for various gases, liquids and organic substances is certain, and the maximum adsorption capacity can reach 5 times of the self weight; the admixture of the high-performance water-based adhesive and water, mud or fine sand has plasticity and cohesiveness; wherein the surface active acidic bleaching earth is capable of adsorbing colored ions.
Cellulose is the oldest and most abundant natural polymer on the earth, and is the inexhaustible and most precious natural renewable resource for human beings. The ether derivatives such as methylcellulose, ethylcellulose, carboxymethylcellulose, and polyanionic cellulose can be produced by using the separated and purified cellulose as a raw material. Cellulose is a macromolecular polysaccharide composed of glucose, and is generally insoluble in water and common organic solvents.
The silica fume has extremely strong volcanic ash activity, the particles are contacted with water, part of small particles are quickly dissolved, and the solution is rich in SiO2Lean Ca2+The gel forms an adhesive layer on the surface of the particle, and after a certain time, the gel is rich in SiO2Poor Ca2+The gel adhesion layer begins to dissolve and reacts with calcium hydroxide produced by cement hydration to produce CSH gel.
The cement is a mineral cementing material, can be changed into a hard stone body from plastic slurry through physical and chemical actions after being mixed with water, and can cement sand, stone and other granular materials into a whole. It has a relationship with water in that it undergoes a hydration reaction to form a hydraulic product. However, in order to meet the construction requirements, the initial setting time is not allowed to exceed 45 min.
The fine ground slag is an ultrafine powder material prepared by drying and grinding blast furnace water-quenched slag serving as a main raw material. Has chemical composition similar to that of common Portland cement, such as CaO 30-42%, SiO2 35~38%，Al2O310-18%, MgO 5-14%, etc. And has the characteristic of self-hydration hardening, can be self-hydrated and hardened after being mixed with water and has strength. When the portland cement is excited, the activity of the portland cement is more fully exerted.
The fly ash is dust particles discharged from a chimney of a thermal power plant by taking coal powder as fuel, and contains a large amount of spherical glass beads, mullite, quartz and a small amount of mineral crystal phase, and the diameter of the fly ash is usually 50-90 mu m. The fly ash has volcanic ash property, but does not have self hydration hardening property, and can only have strength under the action of an active excitant. When the glass is acted with water, especially under the action of an alkaline activator, Ca in the glass body can be generated2+、AlO4 5-、Al3+、SiO4 4-The plasma enters the solution, creating new hydration products, thereby producing intensity.
The quicklime can generate Ca (OH) when meeting water2And heat is released. It is white amorphous powder at room temperature, and is gray or light yellow with impurities, and has hygroscopicity.
The consistency test was further performed.
GBT2419-2005 cement mortar fluidity determination method was selected to assess quicksand consistency. Firstly, preparing quicksand according to the mixing proportion in a table 1; mixing the weighed thickening material into the quicksand, and timing; respectively mixing 20% of cellulose, nano bentonite, cement and quicklime into the high molecular water-absorbing resin, and uniformly stirring the mixture, and further comparing with the conventional water-absorbing material.
And detecting the consistency of the quicksand by using a cement jump table fluidity instrument.
Table 1 different raw materials influence the test results and the cost budget on the consistency of the quicksand.
Cellulose, nano bentonite, cement and quicklime are mixed into the high molecular water-absorbent resin and are mixed into the quicksand, when the thickness spread of the quicksand is 131mm (no pulp flow). In the influence of different mineral substances on the consistency of the quicksand, the different mixing amounts of the varieties are larger, wherein the mixing amount of the sodium bentonite is the least, and the mixing amount of the fly ash is the most. The mineral substance with the water absorption function has relatively less mixing amount, and the higher the water absorption multiple is, the smaller the mixing amount is. When the mineral has no water adsorption capacity, the mineral with higher activity reacts with water faster, and the mixing amount of the mineral with lower activity is less. The finer the grind, the better the thickening effect, with the same activity.
The amount of the 4 kinds of high molecular weight water-absorbing mixtures was different for two different sand samples when the same consistency was achieved. However, the mixing amount of the mixture of the high molecular water-absorbing resin and the nano bentonite is the minimum whether the fine sand or the medium sand is used. Compared with other costs, the mixture of the high molecular water-absorbing resin and the nano bentonite has the fastest speed and the lowest cost for reducing the consistency of the quicksand.
In the influence of the thickness degree and the particle size distribution of the sand material on the consistency of the quicksand, the effect of the macromolecular water-absorbent resin on the consistency reduction of the quicksand is obviously better than that of the middlings, and the cellulose and the mineral substances are just opposite. The high molecular water-absorbing resin and the nano bentonite have obvious advantages in aspects of mixing amount, time for reducing the consistency, cost and the like, and are the best choices.
And (3) carrying out a cement-rich gangue thickening test indoors, and quantitatively describing the mixing amount and the water absorption effect of the high-molecular water-absorbing resin and the nano bentonite. And crushing the retrieved waste rock to prepare argillized waste rock samples with different proportions.
Table 2 material mixing ratio.
The prepared three argillized waste rock samples are respectively added into the macromolecular water-absorbing mixtures with different mixing amounts, and the macromolecular water-absorbing mixtures can better and quickly absorb water in argillized waste rocks under the conditions of different proportions and the blending of the macromolecular water-absorbing mixtures. After the macromolecular water-absorbing mixture is mixed, the gangue is quickly converted into a plastic state from a flowing state. Thereby being capable of discharging the waste rock smoothly.
The greater the gangue to water ratio, the greater the amount of superabsorbent mixture that needs to be blended to achieve the same consistency and vice versa. The high molecular water absorption mixture with unit mass can treat argillized gangue with the self mass of 50-170 times of the flow state. According to the market price of the current high-molecular water-absorbing resin and the nano bentonite, the economic benefit of the method can be preliminarily determined to be that the cost for treating the cement-rich gangue is 55.8 yuan/t-150 yuan/t. According to field observation of a subject group, the ratio of the gangue to the water in the field cement-rich gangue cannot reach the ratio of the water to the gangue material configured in the test, so that the cost can be correspondingly reduced when the high molecular water-absorbent resin and the nano bentonite are adopted for the field cement-rich gangue treatment.
The principle of the present invention is as follows.
The argillization gangue has fluidity, and the free water among particles is too much, the friction force among rock particles is too small, and the particles can move freely, so the mechanism of the fixed telephone is mainly to discharge the free water from the gangue, reduce the consistency of the gangue and increase the friction force among the particles.
Based on the above mechanism, the strategy of the present invention is determined: the water absorption principle of the selected water absorption material is that the more the water absorption capacity of the material per unit mass is, the better the water absorption capacity is.
-CH2=CH-COOH + NaOH→-CH2=CH-COONa+H2O。
n(CH2=CH-COONa)→[-CH2-CH(COONa)]n。
The sodium polyacrylate skeleton forms a network structure, which causes higher concentration of internal ions than external ions, causes osmotic pressure, and can inhibit expansion, i.e., the water absorption capacity of the super absorbent resin is generated.
The main component of the nano bentonite is montmorillonite which has high water absorption, good dispersibility, good adsorptivity and cation exchange capacity, so that a large amount of free water is converted into adsorbed water, and the bentonite is also a material with large specific surface area, so that a large amount of free water can be converted into adsorbed water, thereby further improving the strength of the solidified soil.
The invention has the following advantages: according to the invention, the curing material which can react with water quickly and obviously improve the consistency of the argillized gangue is prepared from the macromolecular water-absorbent resin and the nano bentonite, so that the construction efficiency is greatly improved, and the construction process is simplified.
Drawings
The invention will now be further described with reference to the accompanying drawings by way of example.
FIG. 1 is a flow chart of preparation of argillized gangue.
FIG. 2 is a graph showing the effect of a mixture of water-absorbent polymer resins on the consistency of quicksand.
FIG. 3 is a diagram showing rich cemented gangue before mixing.
FIG. 4 shows the change of the cement-rich gangue after mixing and minutes.
Detailed Description
Water-rich soft rock shaft argillization gangue in the Dalatel Hongqing beam coal mine project of inner Mongolia autonomous region Ordovician.
On-site tests are carried out on the cement-rich waste rocks at 1050m of the main inclined shaft by an organization construction unit, a supervision unit, a design unit and a scientific research unit on the mine. The mixed material of the high molecular water-absorbing resin and the nano bentonite is stirred evenly on site. The bottom plate and the gangue are seriously argillized and have larger water content due to the dual influence of water seepage and water drenching at the top of the roadway and water interception at the upper part of the roadway at the site, and the gangue of the site bottom plate almost flows. The effect of treating the argillized gangue under the two conditions is verified by mixing and not mixing the macromolecular water-absorbing mixture on site. It can be seen that the water absorption effect of the high molecular water-absorbing mixture after being sprinkled on the surface of the cement-rich gangue is very obvious, the cement-rich gangue is changed into a viscous state from a flowing state after two minutes, and the water absorption depth of the high molecular water-absorbing mixture can reach 30mm without any treatment. After the high-molecular water-absorbing mixture is fully mixed with the cement-rich waste rock, the hardening effect of the cement-rich waste rock is better than that of the cement-rich waste rock only spread on the surface of the cement-rich waste rock after 2min, and the state of the cement-rich waste rock is obviously improved compared with that of the cement-rich waste rock in the first case. The water absorption range of the high molecular water-absorbing mixture is better than that of the mixture only scattered on the surface of the cement-rich gangue. Therefore, when the high molecular water-absorbing mixture is applied on site, the mixture is fully stirred so as to achieve better water absorption effect.
Through field tests, the water absorption effect of the mixture of the high-molecular water-absorbent resin and the nano bentonite is verified, and although certain construction cost is increased by doping the high-molecular water-absorbent resin into the treatment of the water-rich argillized gangue, the effect of the high-molecular water-absorbent resin on treating the argillized gangue is good, and the water absorption is strong. The method can quickly reduce the water in the rich-hydration-type waste rock and increase the consistency of the rich-hydration-type waste rock, thereby achieving the purposes of reducing the problems of difficult waste rock discharge, even incapability of discharging the waste rock and the like caused by too large water content of the rich-hydration-type waste rock, reducing the working strength of workers, accelerating the waste rock discharge speed, further accelerating the tunneling construction progress, saving a large amount of funds and labor force, and having considerable economic benefit.
Although specific embodiments of the invention have been described herein, it will be understood by those skilled in the art that the specific examples given are for purposes of illustration only and are not intended to limit the scope of the invention, which is to be construed in accordance with the doctrine of equivalents as well as variations thereof which would be obvious to persons skilled in the art and which would nevertheless be encompassed by the scope of the invention as set forth in the appended claims.
Claims (7)
1. A preparation method of a argillization gangue curing agent is characterized by comprising the following steps: the composition comprises the following components in parts by weight: 12-27 parts of nano bentonite and 73-88 parts of high molecular water-absorbing resin.
2. The argillization gangue curing agent according to claim 1, which is characterized in that: the bentonite is nano bentonite which accords with bentonite GB/T20973-2007.
3. The argillization gangue curing agent according to claim 1, which is characterized in that: the high molecular water-absorbent resin comprises polyvinyl chloride resin, polyurethane resin, acrylic resin and polyolefin resin.
4. The argillization gangue curing agent according to claim 1, which is characterized in that: the mass ratio of the nano bentonite to the high polymer water-absorbent resin is 1: 4.
5. The application of the argillization gangue curing agent as defined in any one of claims 1 to 4 in soft rock engineering, which is characterized in that: the argillization waste rock curing agent is doped into argillization waste rock according to 2.4% -30% of argillization waste rock mass, and is uniformly stirred with argillization waste rock, and the water content of the argillization waste rock is 80% -1000%.
6. Use according to claim 5, characterized in that: the argillization gangue curing agent is doped into the waste gangue according to the following steps:
(1) uniformly mixing the nano bentonite and the high polymer water-absorbent resin in proportion to obtain a mixture;
(2) uniformly mixing the argillized gangue and the mixture according to a proportion.
7. Use according to claim 6, characterized in that: and (3) conveying the uniformly mixed mixture obtained in the step (2) out of the shaft after the mixture is solidified.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114703831A (en) * | 2022-04-20 | 2022-07-05 | 山西四建集团有限公司 | Construction method of reinforced concrete cast-in-place pile under complex geological condition |
| CN116355601A (en) * | 2023-02-27 | 2023-06-30 | 桂林理工大学 | Sand pebble large-aperture stratum wall protection slurry and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114703831A (en) * | 2022-04-20 | 2022-07-05 | 山西四建集团有限公司 | Construction method of reinforced concrete cast-in-place pile under complex geological condition |
| CN116355601A (en) * | 2023-02-27 | 2023-06-30 | 桂林理工大学 | Sand pebble large-aperture stratum wall protection slurry and preparation method thereof |
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