A mine road solidified material and a preparation method thereof

Abstract

The application discloses a mine road solidifying material and a preparation method thereof, and is mainly prepared from 68-94.7% of a main material, 5-31% of a modifier and 0.3-1% of a binder in percentage by mass; the main material is mining blast pile slag; the modifier is steel slag or fly ash with more than 15% of active CaO in percentage by mass; and the binder is a synthetic environment-friendly high-molecular polymer. The mine road solidifying material provided by the application has the advantages of cheap and easily available raw materials, simple preparation method, suitability for continuous and large-scale production and high popularization and application value. The molecular chain of the binder contains a large number of ester groups (-OCOCH3) and alkyl groups (-CH2-CH2), so that the solidified mine road has good water permeability resistance; meanwhile, the binder contains a large number of carboxyl groups (-COOH), so that small cracks generated in the mine road can be self-closed under pressure, and the mine road has the crack self-repairing characteristic, thereby solving the problems of easy damage of the existing mine open-pit mine road, low vehicle running speed and high truck tire wear.

Description

Technical Field

[0001] This invention relates to the field of open-pit mine road engineering, specifically a solidification material for mine roads and its preparation method. Background Technology

[0002] Currently, the common method for constructing open-pit mine roads in China involves first leveling the road with a grader and then compacting it with a roller. This method results in low-quality roads with problems such as easy road surface damage, low vehicle speed, dust pollution, and high truck tire wear. Overseas open-pit mines use a combination of polymeric road solidification compound and clay minerals for road construction. Through the compaction process, an organic film is formed that binds the soil and rock particles, offering advantages such as improved transportation efficiency, extended road surface life, and reduced tire wear. However, the high cost of polymeric compounds and the limited availability of clay minerals in China prevent their widespread adoption. Therefore, there is an urgent need to develop an economical, practical, and large-scale applicable solidification material for mine roads. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention aims to provide a solidification material for mining roads and its preparation method.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A mine road hardening material, characterized in that, by mass percentage, it is mainly composed of 68%-94.7% of a main material, 5%-31% of a modifier, and 0.3%-1% of a binder; the main material is mining blasting slag containing silicate minerals, quartz, and oxide minerals; the modifier is steel slag or fly ash containing more than 15% active CaO by mass; the binder is a synthetic environmentally friendly polymer having a structure as shown in Formula I:

[0006]

[0007] Furthermore, the molecular weight of the environmentally friendly polymer is 12 million to 17 million, m = 100,000 to 150,000, n = 30,000 to 50,000, and p = 5,000 to 20,000.

[0008] Furthermore, the steel slag is water-quenched slag from the iron and steel smelting process, and the fly ash is flue dust from thermal power generation; the natural moisture content of the steel slag or fly ash before use is less than 2% by mass.

[0009] Furthermore, the particle size of the mining blasting debris is less than 0.15 mm, and the water content is less than 10% by mass.

[0010] This invention also provides a method for preparing the above-mentioned mine road hardening material, the specific process of which is as follows:

[0011] A1. Preparation of environmentally friendly polymer: Using vinyl acetate, acrylic acid and ethylene as the main reactant monomers, water and surfactant are added and stirred to dissolve. Then a catalyst is added and stirred at 40-60℃ for 5-8 hours to obtain a colorless viscous liquid, which is the environmentally friendly polymer.

[0012] A2. The environmentally friendly polymer obtained in step A1 is mixed with the main material and modifier to prepare a solidification material for mine roads.

[0013] Furthermore, the surfactant includes at least one of sodium dodecyl sulfonate and sodium dodecylbenzene sulfonate.

[0014] Furthermore, the catalyst may be one or both of potassium persulfate and sodium persulfate.

[0015] Furthermore, the mass ratio of vinyl acetate, acrylic acid, ethylene, surfactant, catalyst and water is 10-15:3-5:0.5-2:0.01-0.02:0.05-0.10:77.88-86.44.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. The raw materials for the mine road solidification material provided by this invention are inexpensive and readily available, the preparation method is simple, it is suitable for continuous large-scale production, and it has high promotion and application value.

[0018] 2. The adhesive used in this invention uses vinyl acetate, acrylic acid, and ethylene as the main reactant monomers for polymerization. It is synthesized into a high molecular polymer through free radical initiation catalysis. The molecular chain contains a large number of ester groups (-OCOCH3) and alkyl groups (-CH2-CH2), which makes the cured mine road have good water resistance. At the same time, it contains a large number of carboxyl groups (-COOH), which allows small cracks in the existing mine road to close on their own under pressure, thus possessing self-healing properties. This can solve the problems of easy damage, low vehicle operating speed, and high wear of truck tires in existing open-pit mine roads. Attached Figure Description

[0019] Figure 1 This is a flowchart illustrating the methods of various embodiments of the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings. It should be noted that this embodiment is based on the present technical solution and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.

[0021] Example 1

[0022] This embodiment provides a method for preparing a solidification material for mine roads, such as... Figure 1 As shown, the specific process is as follows:

[0023] 1) Preparation of environmentally friendly polymer: According to the mass percentage, 10% vinyl acetate, 3% acrylic acid, 0.5% ethylene, 0.01% sodium dodecyl sulfonate and 86.44% water are added to the reaction vessel in sequence and stirred to dissolve for 0.5 hours. Then, 0.05% potassium persulfate is added. The mixture in the reaction vessel is then heated to 40°C and stirred for 8 hours. After the reaction is completed, the resulting colorless viscous liquid is the binder with a molecular weight of approximately 17 million.

[0024] 2) After drying and crushing, the blasting slag powder passes through a 100-mesh standard sieve. The moisture content of the blasting slag is less than 10% as measured by experiments. The blasting slag comes from waste rock blasted during ore mining. It is mainly composed of silicate minerals and quartz, and contains a small amount of oxide minerals.

[0025] 3) In the solidification material for mine roads, the modifier, mining blasting waste, and binder are used at 5%, 94.5%, and 0.5% by mass percentage, respectively. The modifier is steel slag containing 18% active CaO by mass. The modifier is added to the mining blasting waste and stirred using a drum mixer at a speed of 200 r / min. During the stirring process, the binder and a certain amount of water are gradually added. The mixture is stirred for 15 minutes. The amount of water added is 15% of the total mass of the solidification material for mine roads. The mixture is then thoroughly mixed to obtain the road surface material.

[0026] 4) The prepared road surface material is laid flat on the road using a bulldozer, and then compacted using a road roller. After compaction, the thickness of the road surface material is controlled to be greater than 5 cm. The compacted road surface needs to be cured for more than 24 hours before vehicles can pass. The road surface material prepared in this embodiment can significantly improve the water resistance grade of the road surface to P10 and can enhance the compressive strength of the road surface to 16.8 MPa.

[0027] Example 2

[0028] This embodiment provides a method for preparing a solidification material for mine roads, such as... Figure 1 As shown, the specific process is as follows:

[0029] 1) Preparation of environmentally friendly polymer: According to the mass percentage, 15% vinyl acetate, 5% acrylic acid, 2% ethylene, 0.02% sodium dodecyl sulfonate and 77.88% water are added to the reaction vessel in sequence and stirred to dissolve for 0.5 hours. Then, 0.1% potassium persulfate is added. The mixture in the reaction vessel is then heated to 60°C and stirred for 5 hours. After the reaction is completed, the resulting colorless viscous liquid is the binder with a molecular weight of approximately 12 million.

[0030] 2) After drying and crushing, the blasting slag powder passes through a 100-mesh standard sieve. The moisture content of the blasting slag is less than 10% as measured by experiments. The blasting slag comes from waste rock blasted during ore mining. It is mainly composed of silicate minerals and quartz, and contains a small amount of oxide minerals.

[0031] 3) In the solidification material for mine roads, the modifier, mining blasting waste, and binder are used at 5%, 94.7%, and 0.3% by mass percentage, respectively. The modifier is steel slag containing 20% ​​active CaO by mass. The modifier is added to the mining blasting waste and stirred using a drum mixer at a speed of 200 r / min. During the stirring process, the binder and a certain amount of water are gradually added. Stir for 15 minutes. The amount of water added is 15% of the total mass of the solidification material for mine roads. After mixing evenly, this is called the road surface material.

[0032] 4) The prepared road surface material is laid flat on the road using a bulldozer, and then compacted with a road roller. After compaction, the thickness of the road surface material is controlled to be greater than 5 cm. The compacted road surface needs to be cured for more than 24 hours before vehicles can pass. The road surface material prepared in this embodiment can significantly improve the water resistance grade of the road surface to P11 and enhance the compressive strength of the road surface to 17.6 MPa.

[0033] Example 3

[0034] This embodiment provides a method for preparing a solidification material for mine roads, such as... Figure 1 As shown, the specific process is as follows:

[0035] 1) Preparation of environmentally friendly polymer: According to the mass percentage, 11% vinyl acetate, 4% acrylic acid, 1% ethylene, 0.02% sodium dodecyl sulfonate and 83.91% water are added to the reaction vessel in sequence and stirred to dissolve for 0.5 hours. Then, 0.07% potassium persulfate is added. The mixture in the reaction vessel is then heated to 50°C and stirred for 6 hours. After the reaction is completed, the resulting colorless viscous liquid is the binder with a molecular weight of approximately 15.8 million.

[0036] 2) After drying and crushing, the blasting slag powder passes through a 100-mesh standard sieve. The moisture content of the blasting slag is less than 10% as measured by experiments. The blasting slag comes from waste rock blasted during ore mining. It is mainly composed of silicate minerals and quartz, and contains a small amount of oxide minerals.

[0037] 3) In the solidification material for mine roads, the modifier, mining blasting residue, and binder are used at 31%, 68%, and 1% by mass percentage, respectively. The modifier is fly ash containing 17% active CaO by mass. The modifier is added to the mining blasting residue and stirred using a drum mixer at a speed of 200 r / min. During the stirring process, the binder and a certain amount of water are gradually added. The mixture is stirred for 15 minutes. The amount of water added is 15% of the total mass of the solidification material for mine roads. The mixture is then thoroughly mixed and is called the road surface material.

[0038] 4) The prepared road surface material is laid flat on the road using a bulldozer, and then compacted using a road roller. After compaction, the thickness of the road surface material is controlled to be greater than 5 cm. The compacted road surface needs to be cured for more than 24 hours before vehicles can pass. The road surface material prepared in this embodiment can significantly improve the water resistance grade of the road surface to P9 and enhance the compressive strength of the road surface to 15.2 MPa.

[0039] For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of this invention.

Claims

1. A method for preparing a solidification material for mining roads, characterized in that, By weight percentage, the mine road hardening material is prepared from 68%-94.7% of the main material, 5%-31% of the modifier, and 0.3%-1% of the binder; the main material is mining blasting waste; the mining blasting waste is mainly composed of silicate minerals and quartz, containing a small amount of oxide minerals; the modifier is steel slag or fly ash containing more than 15% active CaO by weight; the binder is a synthetic environmentally friendly polymer, which has a structure as shown in Formula I: Formula I; The molecular weight of environmentally friendly polymers is 12 million to 17 million, m = 100,000 to 150,000, n = 30,000 to 50,000, and p = 5,000 to 20,000. The specific process of the preparation method is as follows: A1. Preparation of environmentally friendly polymer: Add water and surfactant to a mixture of vinyl acetate, acrylic acid, and ethylene and stir to dissolve. Then add a catalyst and stir the mixture at 40-60℃ for 5-8 hours to obtain a colorless viscous liquid, which is the environmentally friendly polymer. The mass ratio of vinyl acetate, acrylic acid, ethylene, surfactant, catalyst, and water is 10-15:3-5:0.5-2:0.01-0.02:0.05-0.10:77.88-86.

44. A2. The environmentally friendly polymer obtained in step A1 is mixed with the main material and modifier to prepare a solidification material for mine roads.

2. The preparation method according to claim 1, characterized in that, The surfactant includes at least one of sodium dodecyl sulfonate and sodium dodecylbenzene sulfonate.

3. The preparation method according to claim 1, characterized in that, The catalyst is one or both of potassium persulfate and sodium persulfate.

4. The preparation method according to claim 1, characterized in that, The steel slag is water-quenched slag produced during the iron and steel smelting process, and the fly ash is flue dust from thermal power generation; the natural water content of the steel slag or fly ash before use is less than 2% by mass.

5. The preparation method according to claim 1, characterized in that, The blasting debris has a particle size of less than 0.15 mm and a water content of less than 10%.

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