Drag reducer for ore pulp conveying and preparation method thereof

Abstract

The invention relates to the technical field of drag reducers, in particular to a drag reducer for ore pulp conveying and a preparation method of the drag reducer. The drag reducer for ore pulp conveying comprises a component A and a component B, wherein the component A comprises the following components in parts by mass: 5-6 parts of polyvinylpyrrolidone, 0.8-2 parts of modified boron nitride and 0.5-1 part of a dispersing agent; the component B is prepared from the following components in parts by weight: 1 to 1.5 parts of polyacrylamide, 0.2 to 0.5 part of phytosterol and 0.2 to 0.5 part of modified protein powder; the mass ratio of the component A to the component B is (0.8-2): 1; the preparation method of the modified boron nitride comprises the following steps: dissolving nano boron nitride in absolute ethyl alcohol, stirring, adding lithium stearate, ultrasonically dispersing, centrifuging and drying to obtain pretreated boron nitride; and dispersing catechol and the pretreated boron nitride in absolute ethyl alcohol according to a mass ratio of 1: (1-1.5), adding triethanolamine, stirring for 2-4 hours, cooling to room temperature, centrifugally washing, and drying in vacuum to obtain the modified boron nitride. The drag reducer for ore pulp conveying, provided by the invention, can keep relatively high shear resistance while effectively reducing drag.

Description

Technical Field

[0001] This application relates to the field of drag-reducing agents, and in particular to a drag-reducing agent for slurry transportation and its preparation method. Background Technology

[0002] Mineral slurry refers to a liquid mixture formed by adding water and other auxiliary agents to solid raw materials such as ores and soils in industrial production to extract target elements. Therefore, mineral slurry contains a large amount of suspended solids and cations. Mining often faces problems of long distance, high concentration, and high abrasion when transporting mineral slurry. During the transportation process, the friction coefficient between the mineral slurry and the pipe wall is relatively large, which brings great difficulties to the transportation of mineral slurry. Therefore, it is necessary to use drag-reducing agents to reduce the friction coefficient and reduce the difficulty of mineral slurry transportation.

[0003] Drag-reducing agents need to be resistant to high temperatures and chemical corrosion, and compatible with the composition of the slurry. Related technologies typically include polymer-based drag-reducing agents and nanomaterial-based drag-reducing agents. Due to the relatively high cost of the latter, polymer-based drag-reducing agents are more commonly used. However, polymer-based drag-reducing agents suppress turbulence through molecular chain entanglement, but they often suffer from shear sensitivity issues. Specifically, under high flow velocities (>3 m / s) or the shearing action of centrifugal pumps, the molecular chains break, leading to a decrease in drag-reducing performance. Summary of the Invention

[0004] This application provides a drag-reducing agent for slurry transportation and a method for preparing the same, in order to solve the problems mentioned in the background art.

[0005] In a first aspect, a drag-reducing agent for slurry transportation is provided, comprising component A and component B:

[0006] According to the mass fractions, component A includes 5 to 6 parts of polyvinylpyrrolidone, 0.8 to 2 parts of modified boron nitride, 0.5 to 1 part of dispersant, and water with a mass of 20 times that of polyvinylpyrrolidone;

[0007] Component B comprises 1 to 1.5 parts polyacrylamide, 0.2 to 0.5 parts phytosterols, 0.2 to 0.5 parts modified protein powder, and water at a mass of 20 times that of polyacrylamide.

[0008] The mass ratio of component A to component B is (0.8–2):1;

[0009] The method for preparing the modified boron nitride includes:

[0010] Nano boron nitride was dissolved in anhydrous ethanol at a mass ratio of 1:40. After stirring, lithium stearate was added, and the mixture was ultrasonically dispersed for 30 min. After centrifugation and drying, pretreated boron nitride was obtained. The amount of lithium stearate added was 10% of the mass of nano boron nitride.

[0011] Catechol and pretreated boron nitride were dispersed in anhydrous ethanol at a mass ratio of 1:(1-1.5), triethanolamine was added, and the mixture was stirred at 70°C for 2-4 hours. After cooling to room temperature, the mixture was centrifuged, washed, and vacuum dried to obtain modified boron nitride. The mass of the triethanolamine was 5%-10% of the mass of the catechol.

[0012] Preferably, the method for preparing the modified protein powder includes:

[0013] Dissolve 1-5 μm shell scleroprotein powder in deionized water to obtain a 5 wt% dispersion.

[0014] Hydrogenated coconut oil acid and p-toluenesulfonic acid were added to the dispersion, the temperature was raised to 60-70°C, and the mixture was reacted under stirring for 2-3 hours. After cooling, the mixture was centrifuged and dried to obtain modified protein powder.

[0015] The mass ratio of the shell protein powder to the hydrogenated coconut oil acid is 20:(1-2), and the amount of p-toluenesulfonic acid added is 10% of the mass of the hydrogenated coconut oil acid.

[0016] Preferably, the dispersant comprises at least one of 2-morpholine ethanesulfonic acid and sodium octyl butyl sulfonate.

[0017] Preferably, the dispersant is 2-morpholine ethanesulfonic acid and sodium octyl butyl sulfonate in a mass ratio of 1:(1-3).

[0018] Secondly, a preparation method is provided for preparing the drag-reducing agent for slurry transportation as described in any of the above-mentioned methods, comprising the following steps:

[0019] S1. After dispersing polyvinylpyrrolidone in water at a mass ratio of 1:20, stir at 50°C until completely dissolved, then add modified boron nitride and dispersant, and ultrasonically disperse for 15 min to obtain a suspension of component A.

[0020] S2. Disperse polyacrylamide in water at a mass ratio of 1:20, add phytosterol, stir at 200-300 rpm for 1 hour, add modified protein powder and heat to 40-50℃, stir at 100-200 rpm for 30 minutes to obtain component B.

[0021] S3. Under continuous stirring, add component A to component B and continue stirring and mixing for 30 minutes to obtain a drag-reducing agent for slurry transportation.

[0022] Preferably, in step S1, the power of ultrasonic dispersion is 200-300W.

[0023] The beneficial effects of the technical solution provided in this application include:

[0024] This application provides a drag-reducing agent for slurry transportation and its preparation method. Component A, polyvinylpyrrolidone, and component B, polyacrylamide, are high molecular weight polymers. Polyvinylpyrrolidone lubricates the pipe wall, while the mixture of polyacrylamide and polyvinylpyrrolidone forms a chain network structure, thereby reducing the correlation moments of the sol in various directions within the slurry. Phytosterols and modified protein powder reduce friction through surface lubrication and molecular dispersion. Boron nitride modification enhances hydrophilicity, and its nanosheet structure is uniformly dispersed in the PVP / PAM composite system, adsorbing onto the surface of slurry particles to form an "isolation layer," reducing particle sliding friction and further strengthening the physical entanglement between the nanosheets and polymer chains, inhibiting excessive stretching of the polymer chains. This allows the drag-reducing agent to maintain molecular chain integrity under high shear rates (such as pump transportation and pipe bends), thus maintaining drag-reducing efficiency. The dispersant reduces surface energy, lowering the resistance of slurry transportation. Furthermore, the dispersant contains sulfonic acid groups, improving the salt resistance of the drag-reducing agent and resulting in a significant drag-reducing effect. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A flowchart illustrating the preparation method of drag-reducing agent for slurry transportation provided in this application. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] See Figure 1 As shown, this application provides a drag-reducing agent for slurry transportation, comprising component A and component B. Component A comprises 5-6 parts polyvinylpyrrolidone, 0.8-2 parts modified boron nitride, 0.5-1 part dispersant, and water at a mass ratio of 20 times that of polyvinylpyrrolidone. Component B comprises 1-1.5 parts polyacrylamide, 0.2-0.5 parts phytosterol, 0.2-0.5 parts modified protein powder, and water at a mass ratio of 20 times that of polyacrylamide. The mass ratio of component A to component B is (0.8-2):1.

[0029] The preparation methods of modified boron nitride include:

[0030] Nano boron nitride was dissolved in anhydrous ethanol at a mass ratio of 1:40. After stirring, lithium stearate was added, and the mixture was ultrasonically dispersed for 30 min. After centrifugation and drying, pretreated boron nitride was obtained. The amount of lithium stearate added was 10% of the mass of nano boron nitride.

[0031] Catechol and pretreated boron nitride were dispersed in anhydrous ethanol at a mass ratio of 1:(1-1.5), triethanolamine was added, and the mixture was stirred at 70°C for 2-4 hours. After cooling to room temperature, the mixture was centrifuged, washed, and vacuum dried to obtain modified boron nitride. The mass of the triethanolamine was 5%-10% of the mass of the catechol.

[0032] Methods for preparing modified protein powder include:

[0033] Dissolve 1-5 μm shell scleroprotein powder in deionized water to obtain a 5 wt% dispersion.

[0034] Hydrogenated coconut oil acid and p-toluenesulfonic acid were added to the dispersion, the temperature was raised to 60-70°C, and the mixture was reacted under stirring for 2-3 hours. After cooling, the mixture was centrifuged and dried to obtain modified protein powder.

[0035] The mass ratio of the shell protein powder to the hydrogenated coconut oil acid is 20:(1-2), and the amount of p-toluenesulfonic acid added is 10% of the mass of the hydrogenated coconut oil acid.

[0036] In some alternative embodiments, the dispersant includes at least one of 2-morpholine ethanesulfonic acid and sodium octyl butyl sulfonate.

[0037] In some optional embodiments, the dispersant is 2-morpholine ethanesulfonic acid and sodium octyl butyl sulfonate in a mass ratio of 1:(1-3).

[0038] The preparation method of drag-reducing agent for slurry transportation includes the following steps:

[0039] S1. After dispersing polyvinylpyrrolidone in water at a mass ratio of 1:20, stir at 50°C until completely dissolved, add modified boron nitride and dispersant, and ultrasonically disperse for 15 min to obtain a suspension of component A; optionally, the ultrasonic dispersion power is 200-300W.

[0040] S2. Disperse polyacrylamide in water at a mass ratio of 1:20, add phytosterol, stir at 200-300 rpm for 1 hour, add modified protein powder and heat to 40-50℃, stir at 100-200 rpm for 30 minutes to obtain component B.

[0041] S3. Under continuous stirring, add component A to component B and continue stirring for 30 minutes to obtain a drag reducer for slurry transportation.

[0042] Furthermore, this application also provides the application of the drag-reducing agent for slurry transportation in slurry drag reduction, specifically, the mass concentration of the drag-reducing agent for slurry transportation in the slurry is 100-250 ppm.

[0043] Example 1

[0044] In this embodiment, the preparation of the drag-reducing agent for slurry transportation includes the following steps:

[0045] S1. Disperse 110g of polyvinylpyrrolidone in 2.2kg of water, stir at 50℃ until completely dissolved, then add 20g of modified boron nitride, 5.3g of 2-morpholine ethanesulfonic acid and 10.7g of sodium octyl butyl sulfonate, and sonicate at 200W for 15min to obtain a suspension of component A.

[0046] S2. Disperse 120g of polyacrylamide in 2.4kg of water, add 40g of phytosterol, stir at 200rpm for 1h, add 30g of modified protein powder and heat to 45℃, stir at 100rpm for 30min to obtain component B.

[0047] S3. Under continuous stirring, add 2 kg of component A to 2 kg of component B and continue stirring for 30 min to obtain a drag reducer for slurry transportation.

[0048] The preparation method of modified boron nitride is as follows:

[0049] 25g of nano boron nitride was dissolved in 1kg of anhydrous ethanol, stirred, and then 2.5g of lithium stearate was added. After ultrasonic dispersion for 30min, the mixture was centrifuged and dried to obtain pretreated boron nitride.

[0050] 20g of catechin and 25g of pretreated boron nitride were dispersed in the remaining anhydrous ethanol obtained from the previous centrifugation step, 2g of triethanolamine was added, and the mixture was stirred at 70℃ for 2h. After cooling to room temperature, the mixture was centrifuged and washed, and then vacuum dried to obtain modified boron nitride.

[0051] Methods for preparing modified protein powder include:

[0052] 50g of shell scleroprotein powder with a particle size of 1-5μm was dissolved in deionized water to obtain a 5wt% dispersion.

[0053] Add 3g of hydrogenated coconut oil acid and 0.3g of p-toluenesulfonic acid to the dispersion, heat to 60℃, react under stirring for 2.5h, cool and centrifuge to dry, and obtain modified protein powder.

[0054] Example 2

[0055] The difference between this embodiment and Embodiment 1 is that the amount of modified boron nitride used in step S1 is 16g.

[0056] Example 3

[0057] In this embodiment, the preparation of the drag-reducing agent for slurry transportation includes the following steps:

[0058] S1. Disperse 100g of polyvinylpyrrolidone in 2kg of water and stir at 50℃ until completely dissolved. Then add 40g of modified boron nitride, 5g of 2-morpholine ethanesulfonic acid and 5g of sodium octyl butyl sulfonate and sonicate at 250W for 15min to obtain the suspension of component A.

[0059] S2. Disperse 100g of polyacrylamide in 2kg of water, add 20g of phytosterol, stir at 300rpm for 1h, add 20g of modified protein powder and heat to 40℃, stir at 200rpm for 30min to obtain component B.

[0060] S3. Under continuous stirring, add 1.6 kg of component A to 2 kg of component B and continue stirring for 30 min to obtain a drag reducer for slurry transportation.

[0061] The preparation method of modified boron nitride is as follows:

[0062] 45g of nano boron nitride was dissolved in 1.8kg of anhydrous ethanol, stirred, and then 2.5g of lithium stearate was added. After ultrasonic dispersion for 30min, the mixture was centrifuged and dried to obtain pretreated boron nitride.

[0063] 45g of catechin and 45g of pretreated boron nitride were dispersed in the remaining anhydrous ethanol obtained from the previous centrifugation step, and 2.25g of triethanolamine was added. The mixture was stirred at 70℃ for 3h, cooled to room temperature, centrifuged and washed, and then vacuum dried to obtain modified boron nitride.

[0064] Methods for preparing modified protein powder include:

[0065] 30g of shell scleroprotein powder with a particle size of 1-5μm was dissolved in deionized water to obtain a 5wt% dispersion.

[0066] Add 1.5g of hydrogenated coconut oil acid and 0.15g of p-toluenesulfonic acid to the dispersion, heat to 70℃, react for 2h under stirring, cool and centrifuge to dry, and obtain modified protein powder.

[0067] Example 4

[0068] In this embodiment, the preparation of the drag-reducing agent for slurry transportation includes the following steps:

[0069] S1. Disperse 120g of polyvinylpyrrolidone in 2.4kg of water, stir at 50℃ until completely dissolved, then add 24g of modified boron nitride, 5g of 2-morpholine ethanesulfonic acid and 15g of sodium octyl butyl sulfonate, and sonicate at 300W for 15min to obtain a suspension of component A.

[0070] S2. Disperse 150g of polyacrylamide in 3kg of water, add 40g of phytosterol, stir at 200rpm for 1h, add 50g of modified protein powder and heat to 50℃, stir at 200rpm for 30min to obtain component B.

[0071] S3. Under continuous stirring, add 2 kg of component A to 1 kg of component B and continue stirring for 30 min to obtain a drag reducer for slurry transportation.

[0072] The preparation method of modified boron nitride is as follows:

[0073] 30g of nano boron nitride was dissolved in 1.2kg of anhydrous ethanol, stirred, and 3g of lithium stearate was added. After ultrasonic dispersion for 30min, the mixture was centrifuged and dried to obtain pretreated boron nitride.

[0074] 20g of catechin and 30g of pretreated boron nitride were dispersed in the remaining anhydrous ethanol obtained from the previous centrifugation step, and 1.2g of triethanolamine was added. The mixture was stirred at 70℃ for 4h, cooled to room temperature, centrifuged and washed, and then vacuum dried to obtain modified boron nitride.

[0075] Methods for preparing modified protein powder include:

[0076] 60g of shell scleroprotein powder with a particle size of 1-5μm was dissolved in deionized water to obtain a 5wt% dispersion.

[0077] Add 6g of hydrogenated coconut oil acid and 0.6g of p-toluenesulfonic acid to the dispersion, heat to 65℃, react for 3h under stirring, cool and centrifuge to dry, and obtain modified protein powder.

[0078] Example 5

[0079] The difference between this and Example 1 is that the dispersant in S1 is 16g of 2-morpholinoethanesulfonic acid.

[0080] Comparative Example 1

[0081] The difference between this and Example 1 is that in S1, the modified boron nitride is replaced with an equal amount of nano boron nitride.

[0082] Comparative Example 2

[0083] The difference between this and Example 1 is that in S2, the modified protein powder is replaced with an equal amount of shell protein powder.

[0084] Comparative Example 3

[0085] The difference between this and Example 1 is that no phytosterols are added in S2.

[0086] The drag-reducing agents prepared in Examples 1-5 and Comparative Examples 1-3 were tested.

[0087] Iron ore was used as the test target and crushed to the target particle size (D50 = 75 μm). The ore and water were added to a mixing tank at a mass ratio of 1:1 and stirred at 300 rpm for 15 min. Then, the mixture was ultrasonically dispersed for 5 min to obtain a slurry.

[0088] The system uses a transparent glass tube (25mm inner diameter, 5m length), equipped with an electromagnetic flow meter (accuracy ±0.5%) and a pressure sensor (accuracy ±0.2%), and is powered by a centrifugal pump (flow rate 0.5–5m³ / h). 3 / h, head 20-50m), to conduct simulated placer ore tests.

[0089] Each group of drag-reducing agents was added to the simulated mineral sand at a mass concentration of 160 ppm, and the flow rate was adjusted to 1 m³ / min. 3 After running stably for 10 minutes at a flow rate of 2, 3, 4, and 5 m³ / h, record the initial pressure difference (ΔP0); then adjust the flow rate sequentially to 2, 3, 4, and 5 m³ / h. 3 / h, each flow point is stabilized for 15min, and the pressure difference (ΔP1) is recorded; the drag reduction rate is calculated by comparing the flow resistance of the slurry in the pipeline before and after the addition of drag-reducing agent.

[0090] The average value of each flow point is taken as the drag reduction result by calculating formula (1).

[0091]

[0092] To supplement this, a high-speed shearing machine (10,000 rpm for 5 minutes) was used to simulate turbulent shearing in the pipeline, and the change in drag reduction rate before and after shearing was tested.

[0093] At 25℃, for 10 seconds -1 The shear rate test was performed with an initial viscosity η1, and the shear rate was increased to 1000 s. -1 Hold for 10 minutes, then reduce the shear rate to 10 seconds. -1 Measure the viscosity η2 after recovery and calculate the viscosity retention rate.

[0094]

[0095] The results are shown in Table 1.

[0096] Table 1

[0097] Group Drag reduction rate (%) Viscosity retention rate (%) Example 1 80.33 92.3 Example 2 78.85 85.2 Example 3 72.93 83.8 Example 4 74.37 88.2 Example 5 63.68 78.5 Comparative Example 1 63.55 75.1 Comparative Example 2 44.82 65.8 Comparative Example 3 57.35 70.7

[0098] Example 1 achieved good drag reduction and stability through reasonable proportioning and synergistic modification. In Example 3, the lack of dispersant reduced the dispersibility of modified boron nitride, weakened the drag reduction effect of polymer chains, decreased the overall drag reduction rate, and reduced stability. In Example 4, the mixing ratio of component A to component B was 2:1, resulting in a slight decrease in drag reduction rate and a small decrease in viscosity retention rate. In Comparative Example 1, the unmodified boron nitride had poor hydrophilicity and weak interfacial bonding, making it prone to agglomeration, which led to a decrease in dispersibility and further reduced drag reduction rate and viscosity retention rate.

[0099] Furthermore, regarding the mass concentration of the drag-reducing agent, the above test method was used as the test object for further testing, and Example 1 was used as the test object. The test results are shown in Table 2.

[0100] Table 2

[0101] Mass concentration (ppm) Drag reduction rate (%) Viscosity retention rate (%) 100 44.82 52.0 150 63.68 92.6 160 80.33 92.3 180 81.06 87.5 200 54.64 59.6 250 20.03 46.3

[0102] At lower mass concentrations, drag-reducing agents are insufficiently dispersed in the slurry, leading to concentrated shear stress on individual molecular chains. This makes them prone to main chain breakage, resulting in a sharp drop in molecular weight, a significant decrease in viscosity, and low viscosity retention.

[0103] At higher mass concentrations, the drag reduction mechanism of polymer drag reducers relies on the three-dimensional entanglement network formed by molecular chains in the fluid. When the concentration is too high, the additional molecular chains cannot further expand the network due to steric hindrance, and the drag reduction rate tends to plateau. If the concentration continues to increase, the strong interaction between molecular chains restricts the movement of chain segments and may even form a gel-like structure, which increases the fluid viscosity and concentrates shear stress, making it more prone to breakage.

[0104] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A drag-reducing agent for conveying mineral slurry, characterized in that, It includes component A and component B: According to the mass fractions, component A includes 5 to 6 parts of polyvinylpyrrolidone, 0.8 to 2 parts of modified boron nitride, 0.5 to 1 part of dispersant, and water with a mass of 20 times that of polyvinylpyrrolidone; Component B comprises 1 to 1.5 parts polyacrylamide, 0.2 to 0.5 parts phytosterols, 0.2 to 0.5 parts modified protein powder, and water at a mass of 20 times that of polyacrylamide. The mass ratio of component A to component B is (0.8–2):1; The method for preparing the modified boron nitride includes: Nano boron nitride was dissolved in anhydrous ethanol at a mass ratio of 1:

40. After stirring, lithium stearate was added, and the mixture was ultrasonically dispersed for 30 min. After centrifugation and drying, pretreated boron nitride was obtained. The amount of lithium stearate added was 10% of the mass of nano boron nitride. Catechol and pretreated boron nitride were dispersed in anhydrous ethanol at a mass ratio of 1:(1-1.5), triethanolamine was added, and the mixture was stirred at 70°C for 2-4 hours. After cooling to room temperature, the mixture was centrifuged, washed, and vacuum dried to obtain modified boron nitride. The mass of the triethanolamine was 5%-10% of the mass of the catechol.

2. The drag-reducing agent for slurry transportation as described in claim 1, characterized in that: The method for preparing the modified protein powder includes: Dissolve 1-5 μm shell scleroprotein powder in deionized water to obtain a 5 wt% dispersion. Hydrogenated coconut oil acid and p-toluenesulfonic acid were added to the dispersion, the temperature was raised to 60-70°C, and the mixture was reacted under stirring for 2-3 hours. After cooling, the mixture was centrifuged and dried to obtain modified protein powder. The mass ratio of the shell protein powder to the hydrogenated coconut oil acid is 20:(1-2), and the amount of p-toluenesulfonic acid added is 10% of the mass of the hydrogenated coconut oil acid.

3. The drag-reducing agent for slurry transportation as described in claim 1, characterized in that: The dispersant includes at least one of 2-morpholine ethanesulfonic acid and sodium octyl butyl sulfonate.

4. The drag-reducing agent for slurry transportation as described in claim 3, characterized in that: The dispersant is 2-morpholine ethanesulfonic acid and sodium octyl butyl ester sulfonate in a mass ratio of 1:(1-3).

5. A preparation method for preparing the drag-reducing agent for slurry transportation as described in any one of claims 1 to 4, characterized in that, It includes the following steps: S1. After dispersing polyvinylpyrrolidone in water at a mass ratio of 1:20, stir at 50°C until completely dissolved, then add modified boron nitride and dispersant, and ultrasonically disperse for 15 min to obtain a suspension of component A. S2. Disperse polyacrylamide in water at a mass ratio of 1:20, add phytosterol, stir at 200-300 rpm for 1 hour, add modified protein powder and heat to 40-50℃, stir at 100-200 rpm for 30 minutes to obtain component B. S3. Under continuous stirring, add component A to component B and continue stirring and mixing for 30 minutes to obtain a drag-reducing agent for slurry transportation.

6. The preparation method according to claim 5, characterized in that: In S1, the power of ultrasonic dispersion is 200-300W.

Images