Mining inorganic environment-friendly high-strength thin spraying material and preparation method thereof

Abstract

The invention discloses a mining inorganic environment-friendly high-strength thin spraying material and a preparation method thereof. The mining inorganic environment-friendly high-strength thin spraying material is prepared from the following components in percentage by mass: 20%-30% of white cement, 8%-15% of quartz sand, 5%-10% of fibers, 10%-15% of cast stone powder, 0.1%-1% of a thickening agent, 0.1%-0.8% of latex powder, 0.01%-0.5% of a water reducing agent, 2%-5% of polyoxyethylene and the balance of water. According to the mining inorganic environment-friendly high-strength thin-spraying material and the preparation method thereof, all the components are mixed together according to the proportion, and the synergistic effect of the components is fully exerted, so that the prepared thin-spraying material has excellent flexibility, tensile strength and bonding strength.

Description

Technical Field

[0001] The invention relates to the field of thin-spraying materials for mining, and in particular to an inorganic environmentally friendly high-strength thin-spraying material for mining and a preparation method thereof. Background Art

[0002] Mining thin shotcrete is a new type of material used for supporting the working face of mines. It has high strength, good self-leveling and waterproof properties, is easy to construct and has a long service life. It is mainly composed of raw materials such as cement, slag, lime, sand, etc., and chemical additives such as plasticizers, water reducers, retarders and waterproofing agents are added to improve the fluidity and viscosity of the material.

[0003] The traditional concrete spray coating has insufficient adhesion and high rebound rate, which not only causes a large loss of raw materials, but also is harmful to the health of spray operators. In addition, the slurry is uneven, and the surface is rough after spraying and curing, which cannot achieve the beautification effect. In addition, the concrete spray layer is difficult to synchronize with the rock deformation, which causes the spray layer to fall off. Summary of the invention

[0004] In order to solve the above-mentioned problems of the prior art, the present invention provides an inorganic environmentally friendly high-strength thin spraying material for mining and a preparation method thereof, which has high material strength, is environmentally friendly, and has little impact on operators.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an inorganic environmentally friendly high-strength thin spraying material for mining, which is made of the following components in percentage by mass: 20%-30% white cement, 8%-15% quartz sand, 5%-10% fiber, 10%-15% cast stone powder, 0.1%-1% thickener, 0.1%-0.8% latex powder, 0.01%-0.5% water reducer, 2%-5% polyethylene oxide, and the balance is water.

[0006] The white cement is 425 type first-grade white cement, which has the characteristics of high strength and white color, and can be prepared into various colored gray sand coatings.

[0007] The quartz sand has a mesh size of 100-120 and a silicon dioxide content of 99%-99.5%, and has the functions of improving the surface finish of the sprayed material and enhancing the surface hardness and corrosion resistance.

[0008] The fly ash is first-grade fly ash with mesh size of 180-220, which has the functions of reducing the cost of the sprayed material, reducing the hydration heat of cement, and improving the strength of the sprayed material.

[0009] The fiber does not contain harmful substances, meets environmental protection requirements, and has excellent thermal insulation performance and fireproof and thermal insulation effects.

[0010] The cast stone powder is 325 mesh, and as an aggregate it has a certain hardness and wear resistance, which can increase the hardness and wear resistance of the thin-film spraying material, thereby improving the tolerance and service life of the material surface; the fine particles and good uniformity of the cast stone powder make the material surface smooth and delicate, with good covering and strong adsorption, which can improve the touch of the material. The thickener is an inorganic thickener, which has fine and uniform particle size after being dispersed in water, good colloid properties and strong thixotropic properties.

[0011] The latex powder is a copolymer of acrylate and styrene, which can effectively improve the bonding strength between the thin-spray material and the base layer and enhance the integrity of the material.

[0012] The water reducing agent is a melamine-based water reducing agent, which can improve the compressive strength and impermeability of the sprayed material. The water reducing agent can promote the hydration reaction of cement, thereby improving the bonding ability and impermeability of the material, and helping to enhance the durability and waterproof performance of the sprayed material.

[0013] The polyethylene oxide is of PEO27 type, which has the effect of improving the bonding force of the mortar to the base layer, enhancing its adhesion, and preventing sanding and cracking.

[0014] A method for preparing an inorganic environmentally friendly high-strength thin-sprayed material for mining comprises the following steps: S1: Polyethylene oxide is completely dissolved in water according to the ratio to obtain a polyethylene oxide solution; S2: weigh white cement, quartz sand, fiber, cast stone powder, thickener, latex powder and water reducer according to the proportion, mix them evenly, add a certain amount of water, stir at a speed of 1000-2000r / min for 10-15min to obtain a mixed slurry; S3: The polyethylene oxide solution and the mixed slurry are mixed, and stirred at a speed of 1500-2000 r / min for 5-10 minutes to obtain a thin spray material.

[0015] The beneficial effects of the present invention are as follows: the inorganic environmentally friendly high-strength thin-sprayed material for mining and the preparation method thereof, the components are mixed together in proportion to give full play to the synergistic effect of each other, so that the prepared thin-sprayed material has excellent flexibility, tensile strength and bonding strength, prolongs the curing time, increases the degree of cement hydration, and thus increases the flexural strength of the material; the materials used are environmentally friendly and have little impact on operators. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] Example 1. This example provides an inorganic environmentally friendly high-strength thin spraying material for mining, which is made of the following components in percentage by mass: 25% white cement, 10% quartz sand, 8% fiber, 10% cast stone powder, 1% thickener, 0.5% latex powder, 0.5% water reducer, 3% polyethylene oxide, and the balance is water.

[0018] In this example, the white cement is 425 type first-grade white cement, which has the characteristics of high strength and white color, and can be prepared into various colored gray sand coatings.

[0019] In this example, the quartz sand is 120 mesh and has a silicon dioxide content of 99.5%, which has the effect of improving the surface smoothness of the sprayed material and enhancing the surface hardness and corrosion resistance.

[0020] In this example, the fly ash is 200 mesh first-grade fly ash, which has the effects of reducing the cost of the sprayed material, reducing the hydration heat of cement, and improving the strength of the sprayed material.

[0021] In this example, the fiber does not contain harmful substances, meets environmental protection requirements, and has excellent thermal insulation performance and fireproof and heat insulation effects.

[0022] In this example, the cast stone powder is 325 mesh, which has a certain hardness and wear resistance as an aggregate, and can increase the hardness and wear resistance of the thin-film spraying material, thereby improving the tolerance and service life of the material surface; the fine particles and good uniformity of the cast stone powder make the material surface smooth and delicate, with good covering and strong adsorption, which can improve the touch of the material. In this example, the thickener is an inorganic thickener, which has fine and uniform particle size after being dispersed in water, good colloidal properties, and strong thixotropic properties.

[0023] In this example, the latex powder is a copolymer of acrylate and styrene, which can effectively improve the bonding strength between the thin-spray material and the base layer and enhance the integrity of the material.

[0024] In this example, the water reducing agent is a melamine-based water reducing agent, which can improve the compressive strength and impermeability of the sprayed material. The water reducing agent can promote the hydration reaction of cement, thereby improving the bonding ability and impermeability of the material, and helping to enhance the durability and waterproof performance of the sprayed material.

[0025] In this example, the polyethylene oxide is of PEO27 type, which has the effect of improving the adhesion of the mortar to the base layer, enhancing its adhesion, and preventing sanding and cracking.

[0026] Embodiment 2: This embodiment provides a method for preparing an inorganic environmentally friendly high-strength thin-sprayed material for mining, comprising the following steps: S1: Polyethylene oxide is completely dissolved in water according to the ratio to obtain a polyethylene oxide solution; S2: weigh white cement, quartz sand, fiber, cast stone powder, thickener, latex powder and water reducer according to the proportion, mix them evenly, add a certain amount of water, stir at a speed of 1500r / min for 14min, and obtain a mixed slurry; S3: The polyethylene oxide solution and the mixed slurry are mixed and stirred at a speed of 1800 r / min for 8 minutes to obtain a thin spray material.

[0027] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be repeated here. The above embodiments are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. An inorganic environmentally friendly high-strength thin-spray material for mining, characterized in that: It is made of the following components in percentage by mass: 20%-30% white cement, 8%-15% quartz sand, 5%-10% fiber, 10%-15% cast stone powder, 0.1%-1% thickener, 0.1%-0.8% latex powder, 0.01%-0.5% water reducer, 2%-5% polyethylene oxide, and the balance is water.

2. The inorganic environmentally friendly high-strength thin spraying material for mining according to claim 1 is characterized in that: The white cement is 425 type first-grade white cement.

3. The inorganic environmentally friendly high-strength thin spraying material for mining according to claim 1 is characterized in that: The quartz sand has a mesh size of 100-120 and a silicon dioxide content of 99%-99.5%.

4. The inorganic environmentally friendly high-strength thin spraying material for mining according to claim 1 is characterized in that: The fly ash is first-grade fly ash with a mesh size of 180-220.

5. The inorganic environmentally friendly high-strength thin spraying material for mining according to claim 1 is characterized in that: The cast stone powder is 325 mesh.

6. The inorganic environmentally friendly high-strength thin spraying material for mining according to claim 1 is characterized in that: The thickener is an inorganic thickener.

7. The inorganic environmentally friendly high-strength thin spraying material for mining according to claim 1 is characterized in that: The latex powder is a copolymer of acrylate and styrene.

8. The inorganic environmentally friendly high-strength thin spraying material for mining according to claim 1 is characterized in that: The water reducing agent is a melamine-based water reducing agent.

9. The inorganic environmentally friendly high-strength thin spraying material for mining according to claim 1 is characterized in that: The polyethylene oxide is of PEO27 type.

10. A method for preparing inorganic environmentally friendly high-strength thin-sprayed material for mining, characterized in that: The following steps are involved: S1: Polyethylene oxide is completely dissolved in water according to the ratio to obtain a polyethylene oxide solution; S2: weigh white cement, quartz sand, fiber, cast stone powder, thickener, latex powder and water reducer according to the proportion, mix them evenly, add a certain amount of water, stir at a speed of 1000-2000r / min for 10-15min to obtain a mixed slurry; S3: The polyethylene oxide solution and the mixed slurry are mixed, and stirred at a speed of 1500-2000 r / min for 5-10 minutes to obtain a thin spray material.