Mine anti-corrosion drainage pipeline and preparation process thereof

Abstract

The application discloses a mine anti-corrosion drainage pipeline and a preparation process thereof, and the preparation process comprises the following steps: cleaning a main pipeline to obtain a cleaned pipeline; placing the cleaned pipeline in a stannate solution to perform reaction, so that a stannate film layer is formed on the surface of the cleaned pipeline, and a stannate film layer pipeline is obtained; placing the stannate film layer pipeline in a biological carbon layer solution to perform standing, so that a biological carbon layer is formed on the surface of the stannate film layer pipeline, and a composite film layer pipeline is obtained; wrapping the surface of the composite film layer pipeline with an anti-corrosion cloth, and thus the mine anti-corrosion drainage pipeline is obtained; the composition of acid wastewater is fully considered, and limestone, biological carbon layer and other environment-friendly substances are used to solve the corrosion problem of acid wastewater to the pipeline in a mining area, the biological carbon layer can fix heavy metal ions in acid wastewater and underground soil, effectively hinders the migration of heavy metal elements, and reduces the pollution to the environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline corrosion protection, in particular to a mine corrosion-resistant drainage pipeline and a preparation process thereof. BACKGROUND

[0002] In the process of mining, mine acid wastewater not only harms the ecological environment, but also has a serious corrosive effect on mining equipment and pipelines. Mine acid wastewater, also known as mine acid drainage, is wastewater with a pH value of less than 7.0 generated during the mining process due to chemical reactions, water dissolution, and leakage. The mine wastewater contains high concentrations of heavy metal ions, high concentrations of sulfides, and various microorganisms, which have a serious corrosive effect on underground pipelines.

[0003] The generation of acid wastewater is often related to the exposure of sulfides to water and air, and the oxidation of sulfides by iron-oxidizing thiobacillus can promote the oxidation of sulfides. Effective control of these bacteria can reduce the acid content in some acid water by more than 98%.

[0004] Conventional corrosion protection technologies include paint, coating, electrochemical treatment, chemical conversion treatment, etc. These protection technologies are single and have little protective effect on corrosion behavior under complex conditions such as mines.

[0005] Therefore, the present application is proposed. SUMMARY

[0006] The purpose of the present application is to provide a mine corrosion-resistant drainage pipeline and a preparation process thereof. The present application fully considers the composition of acid wastewater and forms a multi-layer protective layer on the surface of the main pipeline to specifically solve the corrosion problem of acid wastewater on the pipeline in the mining area.

[0007] In order to achieve the above-mentioned purpose of the present application, the following technical solutions are adopted:

[0008] The present application provides a preparation process for a mine corrosion-resistant drainage pipeline, characterized in that the preparation process comprises the following steps:

[0009] (a) cleaning the main pipeline to obtain a cleaned pipeline;

[0010] (b) placing the cleaned pipeline in a stannate solution for reaction to form a stannate film layer on the surface of the cleaned pipeline, thereby obtaining a stannate film layer pipeline, wherein the stannate solution comprises stannic chloride trihydrate, acetic acid trihydrate, pyrophosphate, and alkali;

[0011] (c) placing the stannate film layer pipeline in a biochar layer solution for standing to form a biochar layer on the surface of the stannate film layer pipeline, thereby obtaining a composite film layer pipeline, wherein the biochar layer solution comprises plant straw, magnesium chloride, aluminum chloride, and tannic acid;

[0012] (d) wrapping the anticorrosion cloth on the surface of the composite membrane layer pipe, thus obtaining the mine anticorrosion drainage pipe.

[0013] Preferably, the material of the main pipe can be 12CrlMoV, 15MrMo or 1Cr5Mo.

[0014] Preferably, in the step (a), the cleaning includes water cleaning and alkali cleaning; the alkali concentration is 2% to 8%, and the alkali cleaning time is 20 to 300 min.

[0015] Preferably, in the step (b), the reaction temperature is 30 to 80℃, and the reaction time is 0.5 to 10 h.

[0016] Preferably, in the step (b), the concentration of stannate in the stannate solution is 10 to 60 g / L, the concentration of acetate is 5 to 15 g / L, the concentration of pyrophosphate is 20 to 80 g / L, and the concentration of alkali is 5 to 20 g / L.

[0017] Preferably, the stannate is sodium stannate trihydrate or potassium stannate trihydrate; the acetate can be sodium acetate trihydrate or potassium acetate trihydrate; the pyrophosphate can be sodium pyrophosphate or potassium pyrophosphate; and the alkali is sodium hydroxide or potassium hydroxide.

[0018] Preferably, in the step (b), the pH value of the stannate solution is 9 to 9.5.

[0019] Preferably, in the step (c), the standing time is 12 to 24 h.

[0020] Preferably, in the step (c), the pH value of the biochar layer solution is 8 to 10.5.

[0021] Preferably, in the step (c), the concentration of magnesium chloride in the biochar layer solution is 0.5 to 3 mol / L; the concentration of tannin acid is 1 to 10 g / L; the concentration of plant straw is 5 to 20 g / mL; and the particle size of the plant straw is not less than 100 mesh.

[0022] The molar ratio of magnesium chloride to aluminum chloride is (0.5 to 4) to 1.

[0023] Preferably, in the step (c), the biochar layer solution is prepared by the following method:

[0024] (1) dissolving magnesium chloride, aluminum chloride and tannin acid in water to obtain a mixed solution;

[0025] (2) mixing plant straw in the mixed solution, and then sequentially performing ultrasonic oscillation, magnetic stirring and pH value adjustment to obtain the biochar layer solution.

[0026] Preferably, the ultrasonic oscillation time is 20-40 min; the magnetic stirring speed is 1000-10000 r / min, and the stirring time is 0.5-1 h.

[0027] Preferably, the plant stalks can be corn stalks, rice stalks or wheat stalks.

[0028] Preferably, the anticorrosion cloth can be a glass fiber cloth, a polyester cloth or a glass silk cloth.

[0029] Preferably, the thickness of the anticorrosion cloth is 10-50 mm.

[0030] Preferably, in step (d), the surface of the anticorrosion cloth is wrapped with a layer of limestone; more preferably, the thickness of the limestone layer is 2-5 mm.

[0031] Preferably, the surface of the anticorrosion cloth is wrapped with a layer of limestone.

[0032] The second aspect of the present application provides a mine anticorrosion drainage pipeline prepared by the above preparation process.

[0033] Compared with the prior art, the present application has at least the following beneficial effects:

[0034] The stannate solution used in the preparation process of the present application is non-toxic, non-polluting and low-cost, the formed film layer can be tightly combined with the base metal, the combination is firm and high, the film layer is continuous and dense, and the film layer can effectively protect the corrosion of the base.

[0035] The present application fully considers the composition of acidic wastewater, uses limestone, biological carbon layer and other environmentally friendly substances, and specifically solves the corrosion problem of acidic wastewater to the pipeline in the mining area. The biological carbon layer can fix heavy metal ions in acidic wastewater and underground soil, effectively hinder the migration of heavy metal elements, and reduce the pollution to the environment. DETAILED DESCRIPTION

[0036] The embodiments of the technical solutions of the present application will be described in detail below with reference to the examples. The following examples are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, but cannot limit the protection scope of the present application.

[0037] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meanings understood by the skilled person in the field of the present application.

[0038] Example 1

[0039] The present embodiment is a preparation process of a mine anticorrosion drainage pipeline, which comprises the following steps:

[0040] (a) cleaning the 12CrlMoV main pipeline with clean water, and then placing the main pipeline in a 5% sodium hydroxide solution for 30 min to obtain a cleaned pipeline;

[0041] (b) placing the cleaned pipeline in a stannate solution for reaction to form a stannate film layer on the surface of the cleaned pipeline to obtain a stannate film layer pipeline, wherein the reaction temperature is 30°C, the reaction time is 2 h, the concentration of sodium stannate trihydrate in the stannate solution is 15 g / L, the concentration of sodium acetate trihydrate is 7 g / L, the concentration of sodium pyrophosphate is 25 g / L, and the concentration of sodium hydroxide is 8 g / L;

[0042] (c) placing the stannate film layer pipeline in a biochar layer solution for 12 h to form a biochar layer on the surface of the stannate film layer pipeline to obtain a composite film layer pipeline, wherein the concentration of magnesium chloride in the biochar layer solution is 0.5 mol / L, the concentration of tannic acid is 3 g / L, the concentration of plant straw is 10 g / ml, the molar ratio of magnesium chloride to aluminum chloride is 1.5:1, and the plant straw is corn straw;

[0043] The biochar layer solution is prepared by the following method:

[0044] (1) dissolving magnesium chloride, aluminum chloride and tannic acid in water to obtain a mixed solution;

[0045] (2) placing the plant straw in the mixed solution and mixing uniformly, and then sequentially performing ultrasonic oscillation for 20 min, magnetic stirring at 5000 r / min for 1 h, and adjusting the pH value to 9 to obtain the biochar layer solution;

[0046] (d) wrapping the composite film layer pipeline with a corrosion-resistant cloth to obtain the mine corrosion-resistant drainage pipeline, wherein the corrosion-resistant cloth is a glass fiber cloth, and the thickness of the corrosion-resistant cloth is 15 mm;

[0047] The surface of the corrosion-resistant cloth is wrapped with a layer of limestone having a thickness of 2 mm by adhesive.

[0048] Example 2

[0049] The present embodiment is a preparation process of a mine corrosion-resistant drainage pipeline, which comprises the following steps:

[0050] (a) cleaning the 15MrMo main pipeline with clean water, and then placing the main pipeline in a 3% sodium hydroxide solution for 120 min to obtain a cleaned pipeline;

[0051] (b) the cleaning pipeline is placed in the stannate solution to react, a stannate film layer is formed on the surface of the cleaning pipeline, and a stannate film layer pipeline is obtained, wherein the reaction temperature is 50℃, the reaction time is 2.5h; the concentration of sodium stannate trihydrate in the stannate solution is 30g / L, the concentration of sodium acetate trihydrate is 8g / L, the concentration of sodium pyrophosphate is 40g / L, and the concentration of sodium hydroxide is 10g / L;

[0052] (c) the stannate film layer pipeline is placed in the biochar layer solution to stand for 15h, a biochar layer is formed on the surface of the stannate film layer pipeline, and a composite film layer pipeline is obtained, wherein the concentration of magnesium chloride in the biochar layer solution is 1.5mol / L; the concentration of tannic acid is 4g / L; the concentration of plant straw is 8g / ml; the molar ratio of magnesium chloride to aluminum chloride is 2:1; and the plant straw is rice straw;

[0053] The biochar layer solution is prepared by the following method:

[0054] (1) magnesium chloride, aluminum chloride and tannic acid are dissolved in water to obtain a mixed solution;

[0055] (2) the plant straw is placed in the mixed solution and mixed uniformly, and then is subjected to ultrasonic oscillation for 30min, magnetic stirring at 8000r / min for 0.8h, and pH value adjustment to 9 to obtain the biochar layer solution;

[0056] (d) the composite film layer pipeline is wrapped with an anticorrosive cloth to obtain the mine anticorrosive drainage pipeline, wherein the anticorrosive cloth is a glass fiber cloth; and the thickness of the anticorrosive cloth is 30mm;

[0057] The surface of the anticorrosive cloth is wrapped with a layer of limestone with a thickness of 3mm by adhesive.

[0058] Example 3

[0059] The preparation process of the mine anticorrosive drainage pipeline comprises the following steps:

[0060] (a) the 1Cr5Mo main pipeline is cleaned with water, and then the main pipeline is placed in a 2% sodium hydroxide solution for 300min to obtain a cleaning pipeline;

[0061] (b) the cleaning pipeline is placed in the stannate solution to react, a stannate film layer is formed on the surface of the cleaning pipeline, and a stannate film layer pipeline is obtained, wherein the reaction temperature is 50℃, the reaction time is 2.5h; the concentration of sodium stannate trihydrate in the stannate solution is 30g / L, the concentration of sodium acetate trihydrate is 8g / L, the concentration of sodium pyrophosphate is 40g / L, and the concentration of sodium hydroxide is 10g / L;

[0062] (c) placing the stannate film layer pipe into the biochar layer solution to stand for 24 h, so that a biochar layer is formed on the surface of the stannate film layer pipe, to obtain a composite film layer pipe, wherein the concentration of magnesium chloride in the biochar layer solution is 2 mol / L; the concentration of tannic acid is 6 g / L; the concentration of plant straw is 10 g / mL; the molar ratio of magnesium chloride to aluminum chloride is 4:1; and the plant straw is wheat straw;

[0063] The biochar layer solution is prepared by the following method:

[0064] (1) dissolving magnesium chloride, aluminum chloride and tannic acid in water to obtain a mixed solution;

[0065] (2) placing plant straw in the mixed solution and mixing, and then sequentially performing ultrasonic oscillation for 30 min, magnetic stirring at 10,000 r / min for 1 h, and adjusting the pH value to 9, to obtain a biochar layer solution;

[0066] (d) wrapping the composite film layer pipe with an anticorrosive cloth, to obtain the mine anticorrosive drainage pipe, wherein the anticorrosive cloth is a glass fiber cloth; and the thickness of the anticorrosive cloth is 20 mm;

[0067] The surface of the anticorrosive cloth is wrapped with a layer of limestone with a thickness of 4 mm by adhesion.

[0068] Comparative Example 1

[0069] The preparation process of the mine anticorrosive drainage pipe comprises the following steps:

[0070] (a) cleaning the 1Cr5Mo main pipe with clean water, and then placing the main pipe in a 2% sodium hydroxide solution for 300 min, to obtain a cleaned pipe;

[0071] (b) placing the pipe into a biochar layer solution to stand for 24 h, so that a biochar layer is formed on the surface of the pipe, to obtain a composite film layer pipe, wherein the concentration of magnesium chloride in the biochar layer solution is 2 mol / L; the concentration of tannic acid is 6 g / L; the concentration of plant straw is 10 g / mL; the molar ratio of magnesium chloride to aluminum chloride is 4:1; and the plant straw is wheat straw;

[0072] The biochar layer solution is prepared by the following method:

[0073] (1) dissolving magnesium chloride, aluminum chloride and tannic acid in water to obtain a mixed solution;

[0074] (2) placing plant straw in the mixed solution and mixing, and then sequentially performing ultrasonic oscillation for 30 min, magnetic stirring at 10,000 r / min for 1 h, and adjusting the pH value to 9, to obtain a biochar layer solution;

[0075] (c) wrapping the composite film layer pipe surface with anticorrosive cloth, thus obtaining the mine anticorrosive drainage pipe, wherein the anticorrosive cloth is glass fiber cloth; the thickness of the anticorrosive cloth is 20 mm;

[0076] The surface of the anticorrosive cloth is wrapped with a layer of limestone with a thickness of 4 mm through gluing.

[0077] Experimental example

[0078] The mine anticorrosive drainage pipe prepared by the method of obtaining examples 1-3 and comparative example 1 is obtained;

[0079] The corrosion resistance of the prepared and commercially available mine anticorrosive drainage pipe is tested;

[0080] The corrosion rates of the mine anticorrosive drainage pipes prepared in different examples are calculated, and the calculation results are shown in Table 1:

[0081] Group Corrosion rate Example 1 0.5 mm / a Example 2 0.35 mm / a Example 3 0.2 mm / a Comparative Example 1 0.9 mm / a

[0082] From Table 1, it can be seen that:

[0083] Compared with the comparative example, the mine anticorrosive drainage pipe prepared by the present application has a lower corrosion rate and better corrosion resistance.

[0084] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the examples of the present application, and they should be covered in the scope of the claims and the specification of the present application.

Claims

1. A process for the production of a mine anticorrosion drainage pipe, characterized in that, The preparation process comprises the following steps: (a) cleaning the main pipeline to obtain a cleaned pipeline; (b) placing the cleaned pipeline in a stannate solution to react, forming a stannate film layer on the surface of the cleaned pipeline to obtain a stannate film layer pipeline, wherein the stannate solution comprises stannic chloride trihydrate, acetic acid trihydrate, pyrophosphate and alkali; (c) placing the stannate film layer pipeline in a biochar layer solution to stand, forming a biochar layer on the surface of the stannate film layer pipeline to obtain a composite film layer pipeline, wherein the biochar layer solution comprises plant straw, magnesium chloride, aluminum chloride and tannic acid; (d) wrapping the composite film layer pipeline with a corrosion-resistant cloth to obtain the mine corrosion-resistant drainage pipeline. In the step (b), the reaction temperature is 30-80℃, the reaction time is 0.5-10h, the concentration of stannic chloride trihydrate in the stannate solution is 10-60g / L, the concentration of acetic acid trihydrate is 5-15g / L, the concentration of pyrophosphate is 20-80g / L, and the concentration of alkali is 5-20g / L. The pH value of the stannate solution is 9-9.

5. In the step (c), the standing time is 12-24h, the pH value of the biochar layer solution is 8-10.5, the concentration of magnesium chloride in the biochar layer solution is 0.5-3mol / L, the concentration of tannic acid is 1-10g / L, and the concentration of plant straw is 5-20g / mL. The molar ratio of magnesium chloride to aluminum chloride is (0.5-4):

1. In the step (c), the biochar layer solution is prepared by the following method: (1) dissolving magnesium chloride, aluminum chloride and tannic acid in water to obtain a mixed solution; (2) placing plant straw in the mixed solution, mixing, then sequentially performing ultrasonic oscillation, magnetic stirring and pH value adjustment to obtain the biochar layer solution.

2. The manufacturing process of claim 1, wherein, In the step (d), the surface of the corrosion-resistant cloth is wrapped with a layer of limestone.

3. The mine corrosion-resistant drainage pipeline prepared by the preparation process of any one of claims 1-2.