CN111960754A - Solid waste base grouting material for mine water disaster control roof filling effect and preparation method thereof - Google Patents
Solid waste base grouting material for mine water disaster control roof filling effect and preparation method thereof Download PDFInfo
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- CN111960754A CN111960754A CN202010656344.3A CN202010656344A CN111960754A CN 111960754 A CN111960754 A CN 111960754A CN 202010656344 A CN202010656344 A CN 202010656344A CN 111960754 A CN111960754 A CN 111960754A
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- cement
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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
-
- 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
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
-
- 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
Abstract
The invention discloses a solid waste base grouting material for mine water disaster control roof filling, which comprises the following raw materials in parts by weight: 30-50 parts of recycled cement powder, 10-20 parts of fly ash, 10-20 parts of blast furnace mineral powder, 5-10 parts of desulfurized gypsum, 5-10 parts of clay, 80-120 parts of red mud soup, 2-3 parts of thickening agent, 2-3 parts of water reducing agent and 1-2 parts of stabilizing agent. The regenerated cement powder is prepared by separating concrete components to obtain portland cement, thermally activating portland cement waste, grinding the waste into powder and sieving the powder. All the materials of the invention are solid waste, thereby effectively improving the utilization rate of solid waste resources and reducing the cost of filling materials. The cooperative complementation between different solid wastes optimizes the structure of the grout, improves the working performance of the grout, and can also obviously improve the impermeability of the grouting reinforcement body, and the compatibility and the cohesiveness of a grout-rock interface.
Description
Technical Field
The invention relates to the technical field of mine grouting materials, in particular to a solid waste base grouting material for mine flood damage treatment roof filling and a preparation method thereof.
Background
At present, the coal mining amount in China is still huge, a large amount of low-cost, high-performance and pollution-free grouting materials which can adapt to mine filling rock strata are needed, and green and scientific mining is realized. The utilization rate of solid waste garbage in China is low, a large amount of solid waste can not be fully and effectively utilized, and a large amount of land is occupied. Therefore, the harm of solid waste garbage is reduced to the maximum extent, and the realization of multi-channel and large-quantity recycling is urgent.
Related scholars at home and abroad develop partial research work in the aspect of recycling of solid waste and garbage. The inventor finds that the recycling of the recycled aggregate is mainly used in the prior art, but the recycling of the cement stone waste in the construction waste cannot be solved in time due to the defects of low early strength, too fast setting time and the like of the recycled powder. Application No. 201810288174.0 discloses a rock mass crack grouting material prepared from a cement stone phase and a preparation method thereof, wherein the rock mass crack grouting material prepared from a superfine cement stone regenerated cementing material is taken as a matrix material, so that the defects of high water precipitation rate, poor stability, long setting time, difficulty in filling in tiny cracks, environment pollution in production, large energy and resource consumption, high cost and the like of common portland cement grouting slurry are overcome; the matrix gel component in the waste concrete is mainly separated out and then used as a grouting material, the separation process is complex, and the problems of poor scour resistance, low slurry-rock adhesion, poor durability and impermeability of a grouting reinforcement body and the like of the slurry under flowing water cannot be solved. The application numbers are: 201810220826.7 discloses a method for directly preparing grouting material by using water-containing red mud, which has various raw materials, high requirements on the raw materials and higher cost. Application number 201910334389.6 discloses a red mud-based one-step polymer grouting material and a preparation method thereof, and the preparation process is complex and has high requirements on preparation conditions. In order to achieve high fluidity and low viscosity, the water cement ratio of the conventional cement grouting material is relatively large, so that the hardened cement paste thereof has high porosity, low strength and poor durability. Therefore, a solid waste base grouting material which takes solid waste as a main raw material, has low filling cost and good cohesiveness and increases the impermeability of a grouting reinforcement body is needed at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a solid waste base grouting material for the roof filling effect of mine water damage treatment and a preparation method thereof. All the materials are solid wastes, so that the utilization rate of solid waste resources is effectively improved, and the cost of the filling material is reduced. The cooperative complementation between different solid wastes optimizes the structure of the grout, improves the working performance of the grout, and can also obviously improve the impermeability of the grouting reinforcement body, and the compatibility and the cohesiveness of a grout-rock interface.
The invention is realized by the following technical scheme,
the invention provides a solid waste base grouting material for mine water disaster control roof filling, which comprises the following raw materials in parts by weight:
30-50 parts of recycled cement powder, 10-20 parts of fly ash, 10-20 parts of blast furnace mineral powder, 5-10 parts of desulfurized gypsum, 5-10 parts of clay, 80-120 parts of red mud soup, 2-3 parts of thickening agent, 2-3 parts of water reducing agent and 1-2 parts of stabilizing agent.
Preferably, the recycled cement powder is prepared by the following method:
the portland cement obtained by separating concrete components is ground and sieved after the portland cement waste is thermally activated to prepare regenerated cement powder.
Further, the concrete components are separated into: the waste concrete blocks are firstly put into a furnace to be burnt to 250 ℃, the waste concrete blocks are kept warm for 2.5 hours and then are extremely cooled by wind power, then the waste concrete blocks are put into a rotary rolling cage to roll, mortar particles screened out from gaps of the rolling cage are collected, then the mortar particles are pulverized by a ball mill, and finally the portland cement is obtained by using wind power for powder selection.
Further, the thermal activation is: calcining at 750 deg.C for 3 hr, and heating at 10 deg.C/min.
Preferably, the red mud soup is waste containing red mud generated after refining alumina, and the water content of the red mud soup is 55-65% (by mass).
Preferably, the thickener is guar gum or xanthan gum.
Preferably, the water reducing agent is one of lignosulfonate, sodium naphthalene sulfonate, polycarboxylic acid or casein.
Preferably, the stabilizer is a polycarboxylate or periclase.
In a second aspect of the present invention, a method for preparing the above solid waste base grouting material is provided, which comprises the following steps:
(1) sieving the fly ash with a 250-mesh sieve, and sieving blast furnace slag powder with a 150-mesh sieve;
(2) mixing the regenerated cement powder, the desulfurized gypsum, the clay, the blast furnace slag obtained in the step (1) and the fly ash according to parts by weight to prepare a material A;
(3) stirring and mixing the thickening agent, the water reducing agent and the stabilizing agent according to the parts by weight to prepare a material B;
(4) and (3) mixing half of the total mass of the material A obtained in the step (2) with the material B obtained in the step (3), adding the rest material A for mixing, adding red mud soup for adjusting the water-cement ratio to 0.8-1.2, and obtaining the solid waste base grouting material for the mine water damage control roof filling effect.
The third aspect of the invention provides the application of the solid waste base grouting material in filling of a mine water damage treatment roof.
The invention has the beneficial effects that:
1) according to the invention, all the materials are solid wastes through the selection of the cement stone powder, the desulfurized gypsum, the blast furnace slag, the fly ash, the red mud soup and the clay, so that the utilization rate of solid waste resources is effectively improved, and the cost of the filling material is reduced. The cooperative complementation between different solid wastes optimizes the slurry structure and improves the working performance of the slurry.
2) According to the invention, the clay, the additive and the particle size are added in an optimized manner, so that the impermeability of the grouting reinforcement body, the compatibility and the cohesiveness of a slurry-rock interface are obviously improved, and the problem of water seepage of surrounding rocks and roadways can be well solved.
3) According to the invention, through the treatment of the set cement powder, the set cement powder can be recycled, the added value of the set cement powder is low, the economic benefit is low, the utilization technology is delayed and the like, the large-scale and high-added-value utilization of the set cement powder is realized, the construction waste is more efficiently and reasonably utilized, and the problems of ecological environment and social environment caused by the disordered ground stacking of the construction waste are solved. The filling material specially used for coal mine roof grouting transformation not only solves the recycling problem of solid waste garbage circulation, but also finds a cheap grouting material, and compared with the traditional grouting material (cement), the cost is reduced by more than 40%.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 application belongs.
As described in the background art, the recycling technology of the cement waste in the solid waste garbage is few, and the simple and effective recycling of the cement waste becomes a problem to be solved at present. In addition, the cement waste is used as a grouting material, so that the problems of poor scouring resistance, low slurry-rock adhesion, poor durability and impermeability of a grouting reinforcement body and the like exist. Based on the method, the invention provides the solid waste base grouting material for the mine water disaster control roof filling effect. The raw materials comprise regenerated cement powder, fly ash, blast furnace mineral powder, desulfurized gypsum, clay, red mud soup, thickening agent, water reducing agent and stabilizing agent. The raw materials used in the invention are all solid wastes (except additives), the existing resources are effectively utilized, the economy and the environmental protection are better, the resource utilization rate is effectively improved, and the cement stone powder is treated by high-temperature activation and particle size control in the materials.
According to the invention, by adopting a concrete component separation technology, the regenerated cement powder is obtained from the cement waste by utilizing high-temperature activation, the potential gelling activity of the set cement powder can be excited, the cement is completely replaced to serve as a gelling material, the application of the set cement powder in the grouting engineering field is widened, and the grouting cost is reduced. The hydrated calcium silicate in the set cement can be dehydrated by low-temperature calcination at 750 ℃ to generate beta-C with hydration gelling activity2And S, enabling the set cement powder to become regenerated powder with gelling activity. Calcium sulfate dihydrate, calcium sulfate hemihydrate and phosphate impurity pairs thereof in desulfurized gypsum are beta-C2S has promoting effect on hydration, and can be combined withAluminate in the regenerated powder reacts to generate ettringite, and the effects of retarding coagulation and early strength are achieved. The raw materials such as fly ash, blast furnace mineral powder and the like are milled or subjected to particle size control, so that the full contact among the raw materials is facilitated, the uniformity and the fluidity of the material are enhanced, and the material is easier to inject into rock mass micro-cracks.
When the solid waste base grouting material is prepared, mixing the regenerated cement powder, the desulfurized gypsum, the clay, the screened blast furnace slag and the screened fly ash according to parts by weight to prepare a material A; stirring and mixing the thickening agent, the water reducing agent and the stabilizing agent according to the weight part to prepare a material B; in the process of stirring the material A and the material B, the materials are stirred for two times, so that the potential gelling activity of the regenerated cement powder can be more favorably excited, and the grouting material has higher early and later strength. Desulfurized gypsum and blast furnace mineral powder are added into the slurry material, the alkaline environment provided by the red mud soup can excite the hydration activity of blast furnace slag, the early performance is further improved, the mechanical property of a stone body at the early stage of hydration can be obviously improved, the production cost is reduced, meanwhile, a super-hydrophobic layer is formed on the surface of clay particles, and the anti-scouring performance of the slurry under flowing water is obviously improved. In addition, the addition of the additive can enhance the cohesiveness of a slurry-rock interface, and slurry is easier to inject into a rock mass micro-crack through particle size optimization, so that the durability of a grouting reinforcement body is improved. Therefore, the finally prepared grouting material has higher viscosity, high viscosity after grouting, strong stability, good top plate filling effect and great effect in mine water damage treatment, and can resist water flow impact.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments. If the experimental conditions not specified in the examples are specified, the conditions are generally conventional or recommended by the reagent company; reagents, consumables, and the like used in the following examples are commercially available unless otherwise specified.
Description of terms: the water-cement ratio in the invention is as follows: the ratio between all water in the system (including the added water and the water in the red mud slurry) and all solids in the system.
Example 1
A solid waste base grouting material for mine water disaster control roof filling comprises the following contents:
1) sieving the cement stone powder with a 50-mesh sieve, then placing the powder in a muffle furnace to calcine the powder for 3 hours at the temperature of 750 ℃, wherein the heating rate is 10 ℃/min, grinding the calcined cement stone powder again, and sieving the powder with a 150-mesh sieve.
2) The fly ash is sieved by a 250-mesh sieve, and the blast furnace slag is sieved by a 150-mesh sieve after being ground.
2) 30g of regenerated cement powder, 20g of fly ash, 20g of blast furnace mineral powder, 5g of desulfurized gypsum and 10g of clay are mixed to prepare the material A.
3) Adding 3g of guar gum, 3g of lignosulfonate and 2g of periclase into a stirrer for mixing to obtain a material B.
3) Adding the material A and the material B, stirring for 15min, adding 80g of red mud soup, and adjusting the water-cement ratio to be 1: 1, stirring for 15 min.
Example 2
A solid waste base grouting material for mine water disaster control roof filling comprises the following contents:
1) sieving the cement stone powder with a 50-mesh sieve, then placing the powder in a muffle furnace to calcine the powder for 3 hours at the temperature of 750 ℃, wherein the heating rate is 10 ℃/min, grinding the calcined cement stone powder again, and sieving the powder with a 150-mesh sieve.
2) The fly ash is sieved by a 250-mesh sieve, and the blast furnace slag is sieved by a 150-mesh sieve after being ground.
2) 50g of regenerated cement powder, 10g of fly ash, 10g of blast furnace mineral powder, 10g of desulfurized gypsum and 10g of clay are mixed to prepare the material A.
3) 2g of xanthan gum, 2g of sodium naphthalene sulfonate and 1g of polycarboxylate are added into a stirrer to be mixed to prepare a material B.
3) Adding the material A and the material B, stirring for 15min, adding 120g of red mud soup, and adjusting the water-cement ratio to be 1: 1, stirring for 15 min.
Example 3
A solid waste base grouting material for mine water disaster control roof filling comprises the following contents:
1) sieving the cement stone powder with a 50-mesh sieve, then placing the powder in a muffle furnace to calcine the powder for 3 hours at the temperature of 750 ℃, wherein the heating rate is 10 ℃/min, grinding the calcined cement stone powder again, and sieving the powder with a 150-mesh sieve.
2) The fly ash is sieved by a 250-mesh sieve, and the blast furnace slag is sieved by a 150-mesh sieve after being ground.
2) 40g of regenerated cement powder, 15g of fly ash, 15g of blast furnace mineral powder, 7g of desulfurized gypsum and 8g of clay are mixed to prepare the material A.
3) 2.5g of guar gum, 2.5g of casein and 1.5g of periclase are added into a stirrer to be mixed, and the material B is prepared.
3) Adding the material A and the material B, stirring for 15min, adding 100g of red mud soup, and adjusting the water-cement ratio to be 1: 1, stirring for 15 min.
The cost of the solid waste base grouting material for the mine water disaster control roof filling effect prepared in the embodiment 1-3 is shown in the table 1.
TABLE 1
| Item | Example 1 | Example 2 | Example 3 |
| Cost per ton | 220 | 255 | 229 |
In examples 1 to 3, except for the thickening agent, the water reducing agent, the stabilizing agent and the clay, which need to be purchased at market price, other raw materials are all solid wastes and only need to be paid for transportation, and the use amounts of the thickening agent, the water reducing agent and the stabilizing agent are very small, so that the grouting material prepared by the invention has low cost which is about half of the price of ordinary cement. The construction waste is efficiently and reasonably utilized.
And (3) performance testing:
the solid waste base grouting materials prepared in the examples 1 to 3 are subjected to performance test, a test mold with the thickness of 70.7 multiplied by 70.7mm is used for pouring a sample, the curing temperature is 20 ℃, the humidity is 90%, and the obtained results are shown in a table 2.
TABLE 2
As can be seen from Table 1, the solid waste base grouting material prepared by the invention has the advantages of high compressive strength, good fluidity, high coagulation speed, high slurry viscosity and good stability, can effectively fill a roof in mine water damage treatment, has a remarkable water plugging effect and has good application prospect.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A solid waste base grouting material for mine water disaster control roof filling is characterized by comprising the following raw materials in parts by weight:
30-50 parts of recycled cement powder, 10-20 parts of fly ash, 10-20 parts of blast furnace mineral powder, 5-10 parts of desulfurized gypsum, 5-10 parts of clay, 80-120 parts of red mud soup, 2-3 parts of thickening agent, 2-3 parts of water reducing agent and 1-2 parts of stabilizing agent.
2. The solid waste base grouting material as claimed in claim 1, wherein the recycled cement powder is prepared by the following method:
the portland cement obtained by separating concrete components is ground and sieved after the portland cement waste is thermally activated to prepare regenerated cement powder.
3. The solid waste base grouting material of claim 2, wherein the concrete component separation is: the waste concrete blocks are firstly put into a furnace to be burnt to 250 ℃, the waste concrete blocks are kept warm for 2.5 hours and then are extremely cooled by wind power, then the waste concrete blocks are put into a rotary rolling cage to roll, mortar particles screened out from gaps of the rolling cage are collected, then the mortar particles are pulverized by a ball mill, and finally the portland cement is obtained by using wind power for powder selection.
4. The solid waste based grouting material of claim 2, wherein the thermal activation is: calcining at 750 deg.C for 3 hr, and heating at 10 deg.C/min.
5. The solid waste base grouting material according to claim 1, wherein the red mud soup is a waste material containing red mud generated after refining alumina, and the water content of the red mud soup is 55-65%.
6. The solid waste base grouting material of claim 1, wherein the thickener is guar gum or xanthan gum.
7. The solid waste base grouting material of claim 1, wherein the water reducing agent is one of lignosulfonate, sodium naphthalene sulfonate, polycarboxylic acid or casein.
8. The solid waste base grouting material of claim 1, wherein the stabilizer is polycarboxylate or periclase.
9. The method for preparing the solid waste base grouting material as claimed in any one of claims 1 to 8, characterized by comprising the following steps:
(1) sieving the fly ash with a 250-mesh sieve, and sieving blast furnace slag powder with a 150-mesh sieve;
(2) mixing the regenerated cement powder, the desulfurized gypsum, the clay, the blast furnace slag obtained in the step (1) and the fly ash according to parts by weight to prepare a material A;
(3) stirring and mixing the thickening agent, the water reducing agent and the stabilizing agent according to the parts by weight to prepare a material B;
(4) and (3) mixing half of the total mass of the material A obtained in the step (2) with the material B obtained in the step (3), adding the rest material A for mixing, adding red mud soup for adjusting the water-cement ratio to 0.8-1.2, and obtaining the solid waste base grouting material for the mine water damage control roof filling effect.
10. The use of the solid waste base grouting material of any one of claims 1 to 8 in mine water damage management roof filling.
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