Scale and corrosion preventing device for copper electrolyte conveying pipeline

Abstract

The invention discloses a scale and corrosion preventing device for a copper electrolyte conveying pipeline, and relates to the technical field of protection of non-ferrous metal smelting equipment. According to the scale and corrosion prevention device, a scale inhibition assembly is arranged on the outer side of the outer pipe wall of the conveying pipeline, a flow channel is formed in the scale inhibition assembly, the length of the flow channel is set to be larger than that of the conveying pipeline, a steam inlet in the scale inhibition assembly is close to a liquid inlet of the pipeline, and a steam outlet is close to a liquid outlet of the pipeline; and when the copper electrolyte flows into the conveying pipeline from the liquid inlet, steam enters the runner of the scale inhibition assembly from the steam inlet for circulation and heat exchange. As the length of the flow channel is larger than that of the conveying pipeline, the heat exchange retention time of steam on the outer side of the conveying pipeline can be remarkably prolonged, it is ensured that the steam fully releases heat, the temperature of the conveying pipeline is stably controlled within the range of 55-90 DEG C, copper electrolyte scaling caused by cooling is avoided, and the continuity and stability of the copper electrolyte conveying process are guaranteed; the service life of the conveying pipeline is prolonged and the pipeline maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of protection technology for non-ferrous metal smelting equipment, and in particular to a scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines. Background Technology

[0002] During the electrolytic refining of copper, the resulting copper electrolyte contains high concentrations of sulfuric acid, copper sulfate, and various impurities, making it highly corrosive. In the transport pipeline, the temperature at the copper electrolyte inlet is high, and the pipeline lacks effective active temperature control, causing the pipe wall temperature to drop due to the ambient temperature difference. The solubility of the electrolyte decreases with decreasing temperature, leading to the rapid precipitation and deposition of copper sulfate and impurity crystals on the pipe wall, forming a hard scale layer that can even block the pipeline in severe cases.

[0003] Currently, similar technologies add insulation cotton to the outside of the delivery pipeline, but the insulation effect is limited. Some technologies also use additional processes to remove impurities from the copper electrolyte. For example, application CN201310472852.6 discloses a "comprehensive treatment method for removing antimony and bismuth impurities from copper electrolyte," which uses a comprehensive treatment method including ceramic ultrafiltration, ion exchange, and membrane technology. Through chelating resin adsorption and regeneration, combined with chemical treatment, antimony and bismuth impurities in the copper electrolyte are removed, avoiding system blockage and reducing energy consumption.

[0004] However, the aforementioned patent requires additional process steps. Although the temperature is controlled by adding the filtrate to a temperature-controlled tank to prevent copper sulfate from cooling and crystallizing, the copper electrolyte after antimony and bismuth removal will still cause copper sulfate to cool and crystallize again after flowing back into the delivery pipeline due to the temperature drop. Summary of the Invention

[0005] Based on this, the present invention provides a scale inhibition and corrosion prevention device for copper electrolyte transportation pipelines, which maintains the temperature of the transportation pipeline through scale inhibition components and insulation layer to avoid scale formation in the copper electrolyte due to cooling.

[0006] This invention provides a scale inhibition and corrosion prevention device for copper electrolyte transportation pipelines, wherein the transportation pipeline has an inlet, an outlet, an outer pipe wall, and an inner pipe wall, and the scale inhibition and corrosion prevention device comprises:

[0007] A scale inhibition component is disposed on the outer side of the outer pipe wall. The scale inhibition component has a steam flow channel, the length of which is greater than the length of the conveying pipe. The scale inhibition component is provided with a steam inlet and a steam outlet, the steam inlet being disposed near the liquid inlet and the steam outlet being disposed near the liquid outlet. An insulation layer is disposed on the outside of the scale inhibitor component.

[0008] In some embodiments, the scale inhibitor assembly includes: An outer sleeve is disposed on the outside of the outer pipe wall and forms a steam-containing space between the outer sleeve and the outer sleeve. The steam inlet and the steam outlet are both connected to the containing space. A flow deflector structure is disposed in the accommodating space, and the flow deflector structure encloses and forms the flow channel.

[0009] In some embodiments, the flow-bending structure is a spiral fin, the inner wall of the spiral fin is fixedly connected to the outer pipe wall, the outer wall of the spiral fin is fixedly connected to the outer sleeve, and the spiral fin extends spirally along the axial direction of the conveying pipe to form a continuously spirally closed flow channel.

[0010] In some embodiments, the flow deflection structure includes a plurality of arc-shaped baffles, which are semi-circular or partially circular structures. The plurality of arc-shaped baffles are arranged at intervals perpendicular to the axial direction of the conveying pipe. The edges of the arc-shaped baffles are connected to the outer pipe wall or the outer sleeve, and adjacent arc-shaped baffles are staggered to form the zigzag flow channel.

[0011] In some embodiments, the flow deflector structure includes a plurality of alternately spaced annular baffles. In any two adjacent annular baffles, the inner edge of one annular baffle is fixedly connected to the outer pipe wall, and the outer edge of the other annular baffle is fixedly connected to the outer sleeve, forming the radially radial flow channel.

[0012] In some embodiments, the scale inhibitor is a semi-tube structure that extends spirally along the axial direction of the delivery pipe and is fixedly connected to the outer pipe wall, the semi-tube structure forming a continuous spiral flow channel.

[0013] In some embodiments, the scale inhibitor is a coil structure that extends spirally along the axial direction of the delivery pipe. The inner wall of the coil structure is fixedly connected to the outer pipe wall, and the coil structure itself encloses to form a continuous spiral flow channel.

[0014] In some embodiments, both the steam inlet and the steam outlet are provided with a first connecting joint, and both the liquid inlet and the liquid outlet are provided with a second connecting joint, wherein both the first connecting joint and the second connecting joint are flange interfaces.

[0015] In some embodiments, the inner pipe wall is provided with an anti-corrosion layer, the anti-corrosion layer satisfying the following: Coating adhesion ≥6MPa; and / or, After immersion in copper electrolyte at 60℃ for 1000 hours, the anti-corrosion layer showed no peeling or cracking; and / or, The thickness of the anti-corrosion layer is 0.4-1.0 mm.

[0016] In some embodiments, the thickness of the insulation layer is 40-70 mm.

[0017] Compared with existing technologies, the technical solution has the following advantages: This invention provides a scale inhibition and corrosion prevention device for copper electrolyte transportation pipelines. A scale inhibition component is installed on the outer side of the pipeline wall, and a flow channel is formed within the component. The length of the flow channel is greater than the length of the pipeline. The steam inlet of the scale inhibition component is located near the liquid inlet of the pipeline, and the steam outlet is located near the liquid outlet. Simultaneously, an insulation layer is wrapped around the outside of the scale inhibition component. This allows steam to flow into the flow channel of the scale inhibition component from the steam inlet while the copper electrolyte flows into the pipeline. Because the flow channel length is greater than the pipeline length, the heat exchange residence time of the steam on the outside of the pipeline is significantly extended, ensuring that the steam fully releases heat and stably controls the temperature of the pipeline within the range of 55-90℃. This prevents scale formation in the copper electrolyte due to temperature drop, ensuring the continuity and stability of the copper electrolyte transportation process, extending the service life of the pipeline, and reducing pipeline maintenance costs. Attached Figure Description

[0018] Figure 1 A schematic diagram of the scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines provided by the present invention; Figure 2 A cross-sectional view of the scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines provided by the present invention; Figure 3 A front view of the scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines provided by the present invention; Figure 4 A schematic diagram of the arc-shaped baffle plate in the scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines provided by the present invention; Figure 5 A schematic diagram of the annular baffle plate in the scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines provided by the present invention; Figure 6 This is a schematic diagram of the coil structure in the scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines provided by the present invention. Figure 7 A schematic diagram of the temperature measurement point arrangement during the experiment of the scale inhibition and corrosion prevention device for copper electrolyte transportation pipeline provided by the present invention. Figure 8 This is a schematic diagram of scaling in the control group during the scaling control experiment; Figure 9 This is a schematic diagram of the structure of the experimental group in the scaling control experiment.

[0019] Explanation of reference numerals in the attached figures: 100. Delivery pipe; 110. Liquid inlet; 120. Liquid outlet; 130. Outer pipe wall; 140. Inner pipe wall; 150. Second connecting joint; 200. Scale and corrosion prevention device; 210. Scale inhibition component; 211. Outer sleeve; 212. Baffle structure; 213. Spiral fins; 214. Arc-shaped baffle; 215. Circular baffle; 216. Coil structure; 217. First connecting joint; 220, Flow channel; 230, Steam inlet; 240, Steam outlet; 250, Insulation layer; 260, Anti-corrosion layer. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] This invention provides a scale inhibition and corrosion prevention device for copper electrolyte transportation pipelines, see reference. Figures 1 to 3 , Figure 1 A schematic diagram of the scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines provided by the present invention; Figure 2 A cross-sectional view of the scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines provided by the present invention; Figure 3 This is a front view of the scale inhibition and corrosion prevention device for copper electrolyte transportation pipelines provided by the present invention.

[0022] This invention provides a scale inhibition and corrosion prevention device 200 for a copper electrolyte conveying pipeline 100. The conveying pipeline 100 has an inlet 110, an outlet 120, an outer pipe wall 130, and an inner pipe wall 140. The scale inhibition and corrosion prevention device 200 includes a scale inhibition component 210 and a heat insulation layer 250. The scale inhibition component 210 is disposed on the outside of the outer pipe wall 130 and has a steam flow channel 220, the length of which is greater than the length of the conveying pipeline 100. The scale inhibition component 210 is provided with a steam inlet 230 and a steam outlet 240, the steam inlet 230 being located near the inlet 110 and the steam outlet 240 being located near the outlet 120. The heat insulation layer 250 is disposed on the outside of the scale inhibition component 210.

[0023] Specifically, in this embodiment of the invention, a scale inhibition component 210 is provided on the outer side of the outer wall 130 of the conveying pipeline 100. A flow channel 220 is provided in the scale inhibition component 210, and the length of the flow channel 220 is set to be greater than the length of the conveying pipeline 100. The steam inlet 230 on the scale inhibition component 210 is located near the liquid inlet 110 of the pipeline, and the steam outlet 240 is located near the liquid outlet 120 of the pipeline. At the same time, a heat insulation layer 250 is wrapped around the outside of the scale inhibition component 210, so that while the copper electrolyte flows into the conveying pipeline 100 from the liquid inlet 110, steam enters the flow channel 220 of the scale inhibition component 210 from the steam inlet 230 for heat exchange. Because the length of the flow channel 220 is greater than that of the conveying pipe 100, the heat exchange residence time of steam on the outside of the conveying pipe 100 can be significantly extended, ensuring that the steam fully releases heat, and the temperature of the conveying pipe 100 is stably controlled in the range of 55-90℃. This avoids scaling of copper electrolyte caused by cooling, ensures the continuity and stability of the copper electrolyte conveying process, extends the service life of the conveying pipe 100, and reduces pipeline maintenance costs.

[0024] In some embodiments, the scale inhibition assembly 210 includes an outer sleeve 211 and a baffle structure 212. The outer sleeve 211 is disposed on the outside of the outer pipe wall 130, and a steam containment space is formed between the outer sleeve 211 and the steam inlet 230 and the steam outlet 240, both of which are in communication with the containment space. The baffle structure 212 is disposed in the containment space and forms a flow channel 220.

[0025] With the above structure, the baffle structure 212 guides and constrains the steam, effectively extending the actual steam flow path within the limited axial space of the pipeline. This makes the length of the flow channel 220 greater than the length of the conveying pipeline 100, significantly increasing the heat exchange residence time of the steam outside the conveying pipeline 100. This ensures that the steam fully releases heat and acts evenly on the conveying pipeline 100, improving the uniformity and stability of the temperature control of the conveying pipeline 100. At the same time, the outer sleeve 211 and the baffle structure 212 work together to form a closed and directional steam flow channel 220, which can reduce the loss of steam heat, improve the thermal energy utilization rate, further ensure that the temperature of the conveying pipeline 100 is stably maintained at 55-90℃, enhance the scale inhibition effect, and the overall structure is compact and easy to assemble, making it suitable for industrial applications and on-site modifications.

[0026] Please refer to it again. Figure 2 In some embodiments, the flow deflection structure 212 is a spiral fin 213. The inner wall of the spiral fin 213 is fixedly connected to the outer pipe wall 130, and the outer wall of the spiral fin 213 is fixedly connected to the outer sleeve 211. The spiral fin 213 extends spirally along the axial direction of the conveying pipe 100 to form a continuous spiral closed flow channel 220.

[0027] In this embodiment, the baffle structure 212 adopts the form of spiral fins 213. On the one hand, the spiral extension maximizes the steam flow path within a limited axial space, making the effective length of the flow channel 220 significantly greater than the length of the conveying pipe 100 body, thus greatly extending the residence time of steam in the flow channel 220 and improving heat exchange efficiency. On the other hand, the spiral fins 213, the outer pipe wall 130, and the outer sleeve 211 form a continuous and closed spiral flow channel 220, avoiding steam short-circuiting, flow deviation, or local dead zones, and improving the uniformity of steam flow and heat exchange. At the same time, the spiral fins 213 also have the functions of enhancing heat transfer and structural support, which can improve the overall structural rigidity of the outer sleeve 211 and the conveying pipe 100.

[0028] Please see Figure 4 , Figure 4 This is a schematic diagram of the arc-shaped baffle plate in the scale inhibition and corrosion prevention device for copper electrolyte conveying pipeline provided by the present invention. In some embodiments, the baffle structure 212 includes multiple arc-shaped baffle plates 214. The arc-shaped baffle plates 214 are semi-circular or partially circular structures. The multiple arc-shaped baffle plates 214 are arranged at intervals perpendicular to the axial direction of the conveying pipeline 100. The edges of the arc-shaped baffle plates 214 are connected to the outer pipe wall 130 or the outer sleeve 211, and adjacent arc-shaped baffle plates 214 are staggered to form a zigzag flow channel 220.

[0029] In this embodiment, the baffle structure 212 adopts a staggered arrangement of multiple arc-shaped baffles 214. The staggered arrangement of the arc-shaped baffles 214 guides the steam through multiple deflections, effectively extending the steam flow path. This makes the actual length of the flow channel 220 greater than the length of the conveying pipe 100, significantly extending the heat exchange residence time of the steam outside the conveying pipe 100. This ensures that the steam fully releases heat and stably controls the temperature of the conveying pipe 100 within the range of 55-90℃, achieving efficient scale inhibition. At the same time, the zigzag flow channel 220 can also be called a Z-shaped flow channel 220, which can enhance the steam disturbance and turbulent heat exchange effect, improve the circumferential temperature uniformity of the pipe wall, and avoid local low temperature leading to scale accumulation. Furthermore, the arc-shaped baffles 214 have a simple structure, are easy to process and assemble, and are reliably connected to the outer sleeve 211 and the outer pipe wall 130, which can adapt to the long-term continuous operation of the copper electrolyte conveying pipe 100.

[0030] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of the annular baffle in the scale inhibition and corrosion prevention device for copper electrolyte conveying pipeline provided by the present invention; in some embodiments, the baffle structure 212 includes a plurality of alternately spaced annular baffles 215. In any two adjacent annular baffles 215, the inner edge of one annular baffle 215 is fixedly connected to the outer pipe wall 130, and the outer edge of the other annular baffle 215 is fixedly connected to the outer sleeve 211, forming a radially radial flow channel 220.

[0031] In this embodiment, the baffle structure 212 adopts multiple alternating annular baffles 215 to form radially radial flow channels 220. This significantly extends the flow channels 220 and increases the degree of steam turbulence, making the effective length of the flow channels 220 greater than the length of the conveying pipeline 100. This prolongs the steam heat exchange residence time, ensuring that the steam fully releases heat and acts uniformly on the circumference of the conveying pipeline 100, thus stabilizing the temperature of the conveying pipeline 100 within the scale-inhibiting and corrosion-preventing range of 55-90℃ and inhibiting copper electrolyte scaling. At the same time, the radially radial flow channels 220 can enhance the radial turbulent heat exchange effect of steam, improve the uniformity of the circumferential temperature field of the conveying pipeline 100, and avoid local low-temperature scaling.

[0032] In some embodiments, the scale inhibitor component 210 is a semi-pipe structure. The semi-pipe structure extends spirally along the axial direction of the conveying pipe 100 and is fixedly connected to the outer pipe wall 130. The semi-pipe structure encloses and forms a continuous spiral flow channel 220.

[0033] In this embodiment, the scale inhibition component 210 adopts a semi-tube structure that extends spirally along the axial direction of the conveying pipe 100, eliminating the need for the outer sleeve 211 and independent baffle components. The spiral arrangement of the semi-tube itself significantly extends the steam flow path within the limited axial space, making the effective length of the flow channel 220 greater than the length of the conveying pipe 100. This significantly extends the heat exchange residence time of steam outside the conveying pipe 100, ensuring that the steam fully releases heat. Simultaneously, the semi-tube structure is directly fixed to the outer pipe wall 130, serving both the function of forming the flow channel 220 and strengthening the structure. The overall structure is compact, with high connection strength, and excellent reliability and durability.

[0034] Please see Figure 6 , Figure 6 This is a schematic diagram of the coil structure in the scale inhibition and corrosion prevention device for copper electrolyte conveying pipeline provided by the present invention; in some embodiments, the scale inhibition component 210 is a coil structure 216, the coil structure 216 extends spirally along the axial direction of the conveying pipeline 100, the inner sidewall of the coil structure 216 is fixedly connected to the outer pipe wall 130, and the coil structure 216 itself encloses to form a continuous spiral flow channel 220.

[0035] In this embodiment, the scale inhibition component 210 adopts a coil structure 216 that extends spirally along the axial direction of the conveying pipeline 100. The coil structure 216 itself forms a continuous spiral steam flow channel 220, ensuring that the effective length of the flow channel 220 is greater than the length of the conveying pipeline 100 body. This significantly extends the heat exchange residence time of steam on the outside of the conveying pipeline 100, allowing the steam to fully release heat and stably control the temperature of the conveying pipeline 100 within the scale inhibition and corrosion prevention range of 55-90℃. In addition, the coil structure 216 is directly fixed to the outer pipe wall 130, serving both as a heat exchange enhancement and structural support function.

[0036] In some embodiments, both the steam inlet 230 and the steam outlet 240 are provided with a first connecting joint 217, which is a flange interface; both the liquid inlet 110 and the liquid outlet 120 are provided with a second connecting joint 150, which is a flange interface.

[0037] Specifically, by adopting standardized flange interfaces, a quick, reliable, and sealed connection can be achieved between the scale inhibition component 210 and the external steam transmission pipeline. Assembly and disassembly are convenient, facilitating on-site construction, inspection, and maintenance. For example, using a DN25 flange offers strong versatility and good interchangeability, adapting to commonly used steam pipeline systems in industrial sites and reducing the procurement and processing costs of matching pipe fittings. Simultaneously, the flange connection provides stable sealing performance and high pressure resistance, effectively preventing steam leakage and ensuring stable pressure and flow within the steam channel 220. Similarly, standardized flange interfaces can also achieve a quick, reliable, and sealed connection between the transmission pipeline 100 and the external copper electrolyte transmission equipment, facilitating assembly and disassembly and enabling on-site construction, inspection, and maintenance. For example, a DN80 flange can be used.

[0038] In some embodiments, the inner tube wall 140 is provided with an anti-corrosion layer 260, which satisfies the following conditions: coating adhesion ≥ 6 MPa; and / or, after immersion in copper electrolyte at 60°C for 1000 h, the anti-corrosion layer 260 does not peel off or crack; and / or, the thickness of the anti-corrosion layer 260 is 0.4-1.0 mm.

[0039] Specifically, in this embodiment of the invention, the inner pipe wall 140 is first subjected to sandblasting to remove rust, achieving a treatment grade of Sa2.5, and a surface roughness suitable for the adhesion of the anti-corrosion layer 260 is created. After treatment, an acid-resistant coating is uniformly applied to the inner pipe wall 140 using a brushing process. The anti-corrosion layer 260 is then allowed to dry and cure naturally at ambient temperature for 24 hours, preferably with a dry film thickness of approximately 0.6 mm. The cured anti-corrosion layer 260 has a smooth and flat surface and excellent performance. Through this high-performance anti-corrosion layer 260, a continuous, dense, and stable protective barrier can be formed on the inner pipe wall 140, effectively isolating the copper electrolyte from direct contact with the pipe substrate, fundamentally inhibiting the chemical and electrochemical corrosion of the pipe inner wall by the electrolyte. Furthermore, a coating adhesion strength ≥6 MPa ensures a strong bond between the anti-corrosion layer 260 and the inner pipe wall 140, preventing blistering and peeling under long-term fluid erosion and temperature fluctuations. Immersion in 60℃ copper electrolyte for 1000 hours without peeling or cracking ensures the coating exhibits excellent resistance to media corrosion and structural stability within the device's operating temperature range, while significantly reducing scale buildup. The anti-corrosion layer 260 has a thickness of 0.4-1.0 mm, balancing protective reliability and fluid flow, ensuring sufficient protective thickness while avoiding excessive thickness that could lead to cracking. In conjunction with the aforementioned scale inhibitor component 210, it achieves a synergistic effect of scale inhibition and corrosion prevention, significantly improving the overall durability and operational safety of the copper electrolyte delivery pipeline 100.

[0040] In some embodiments, the thickness of the insulation layer 250 is 40-70 mm.

[0041] Specifically, the use of the insulation layer 250 within this thickness range can effectively block the heat exchange between the scale inhibition component 210 and the external environment, reduce the loss of steam heat to the outside, improve the thermal energy utilization rate, and enhance the scale inhibition and corrosion prevention effects.

[0042] The following experiments illustrate the temperature stability of the outer pipe wall 130 of the conveying pipeline 100 and whether the outer pipe wall 130 has local cold spots in the embodiments of the present invention.

[0043] Please refer to Table 1 for the experimental equipment and materials used in this invention.

[0044] Table 1. Experimental Equipment and Materials

[0045] First, set up the experimental system: connect the processed copper electrolyte 90° DN25 elbow to the copper electrolyte conveying pipe 100 with thermal insulation lining; assemble the steam pipe, and install the steam inlet valve 230 and the vortex flow meter in sequence (strictly follow the flow meter installation requirements: avoid pipe elbows / valves, and reserve straight pipe sections before and after); connect the steam outlet 240 to the copper electrolyte tank.

[0046] Please see Figure 7 , Figure 7 This is a schematic diagram of the temperature measurement point arrangement during the experiment of the scale inhibition and corrosion prevention device for copper electrolyte conveying pipeline provided by the present invention. Five key temperature measurement points were determined according to the experimental plan, with the following specific locations: Measurement point 1, outer pipe wall 130 at copper electrolyte inlet 110; Measurement point 2, outer pipe wall at steam inlet 230; Measurement point 3, central section of outer pipe wall 130 of copper electrolyte conveying pipeline 100; Measurement point 4, outer pipe wall at steam outlet 240; Measurement point 5, outer pipe wall 130 at copper electrolyte outlet 120.

[0047] Use aluminum foil tape to firmly fix the patch-type K-type thermocouples to each measuring point. Figure 3 All thermocouple leads are led out from the same direction to avoid interference with subsequent insulation layer 250 construction.

[0048] The 220VAC power supply is split into two lines: one line connects to a 220V to 24VDC transformer, with the output connected to a vortex flow meter to power it; the other line connects directly to an Agilent data acquisition instrument, with the instrument's signal terminal connected to five thermocouples one by one to ensure stable temperature signal transmission. After completing the equipment and circuit connections, overall insulation is applied to the copper electrolyte delivery pipeline 100 to ensure the integrity of the scale and corrosion inhibitor 200.

[0049] Experimental system debugging: Connect the 220V power supply and observe whether the vortex flowmeter display light up normally and whether the data acquisition instrument can identify each thermocouple. Confirm that there are no short circuits or loose connections in the circuit. Slowly open the 230 valve at the steam inlet to 1 / 2 opening and observe whether there is any air leakage at the flange interfaces and valve connections of the steam pipeline. If air leakage is found, close the valve and reseal it until there is no leakage.

[0050] Data Acquisition: After successful debugging, start the experiment, set up 5 different steam flow conditions, and monitor long-term operating data for 24 hours and 48 hours. Specific acquisition requirements are as follows: Temperature data: Record the temperature (°C) of each measuring point every 5-15 minutes, and record at least 3 sets of stable data for each condition; Flow data: Record the instantaneous steam flow rate (kg / h) for each condition and calculate the average flow rate; Pressure data: Record the instantaneous steam pressure (kPa) for each condition and calculate the average pressure; Data recording: Enter all data into the Agilent data acquisition instrument in real time, and export it to the computer for processing and analysis after the experiment.

[0051] Please refer to Table 2 for a summary of the core experimental data.

[0052] Table 2. Summary of core experimental data

[0053] In Table 2, the temperature at each measuring point is determined as follows: starting from the beginning of the experiment, the temperature at the measuring point is taken at the 5th, 8th, 10th, 13th, and 15th minutes, and the lowest of these temperatures is taken as the temperature of that measuring point. For example, the temperature of measuring point 1 in the first group is determined by taking the temperature at the 5th, 8th, 10th, 13th, and 15th minutes from the beginning of the experiment, and the lowest of these temperatures is taken as the temperature of measuring point 1 in the first group. The same principle applies to the others.

[0054] Experimental data shows that the temperature at all measuring points on the outer wall of the pipeline was ≥75.3℃ under all operating conditions, effectively preventing copper electrolyte from entering the sensitive temperature range for scaling and effectively blocking scale precipitation and adhesion. The steam-related measuring points had the highest temperatures: measuring point 2 (steam inlet) had a stable temperature of 100–111.3℃, and measuring point 4 (steam outlet) had a temperature of 98–99.3℃, indicating that steam effectively transferred heat to the pipeline. The electrolyte-related measuring points had stable temperatures: measuring point 1 (inlet 110) had a temperature of 75.3–105.3℃, and measuring point 5 (outlet 120) had a temperature of 75.8–88.7℃, proving that the electrolyte did not experience a significant temperature drop during transportation, and the coating on the inner wall of the heat exchange tube did not undergo thermal deformation due to temperature changes. Even under stable 48-hour operating conditions with a steam flow rate as low as 4.612 kg / h, the lowest pipeline temperature still reached 76.8℃, with no cases below 70℃, indicating that the scale and corrosion inhibitor 200 has reliable long-term insulation performance.

[0055] Please see Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of scaling in the control group during the scaling control experiment; Figure 9 This is a schematic diagram of the structure of the experimental group in the scaling control experiment. In addition, a scaling control experiment was also conducted. After the above experimental data collection was completed, the experimental equipment was run for another month as the experimental group. Simultaneously, the conveying pipeline 100 without the scaling and corrosion prevention device 200 was run for another month under the same environment as the control group. After one month, the scaling thickness in the experimental group and the control group was compared. Four measuring points were uniformly determined in the conveying pipeline, and the scaling thickness at the first, second, third, and fourth measuring points was measured, and the average scaling thickness was calculated. Please refer to Table 3 for the structural thickness data. It can be seen that the scaling and corrosion prevention device 200 in this invention can significantly reduce the amount of scaling. Furthermore, the experimental group and the control group were rinsed with water respectively. It can be seen that the scaling in the experimental group was easily rinsed away, but the anti-corrosion layer 260 was undamaged. That is, the anti-corrosion layer 260 of this application can form a continuous, dense, and stable protective barrier on the inner wall 140 of the pipeline.

[0056] Table 3 Structural Thickness Data

[0057] In summary, in this embodiment of the invention, a scale inhibition component 210 is provided on the outer side of the outer pipe wall 130 of the conveying pipeline 100. A flow channel 220 is provided in the scale inhibition component 210, and the length of the flow channel 220 is set to be greater than the length of the conveying pipeline 100. The steam inlet 230 on the scale inhibition component 210 is located near the liquid inlet 110 of the pipeline, and the steam outlet 240 is located near the liquid outlet 120 of the pipeline. At the same time, a heat insulation layer 250 is wrapped around the outside of the scale inhibition component 210, so that while the copper electrolyte flows into the conveying pipeline 100 from the liquid inlet 110, steam enters the flow channel 220 of the scale inhibition component 210 from the steam inlet 230 for heat exchange. Because the length of the flow channel 220 is greater than that of the conveying pipe 100, the heat exchange residence time of steam on the outside of the conveying pipe 100 can be significantly extended, ensuring that the steam fully releases heat and stably controls the temperature of the conveying pipe 100 within the range of 55-90℃. This avoids scaling of the copper electrolyte caused by cooling, ensures the continuity and stability of the copper electrolyte conveying process, extends the service life of the conveying pipe 100, and reduces pipeline maintenance costs. Combined with the anti-corrosion layer 260 installed on the inner pipe wall 140, a dual effect of scale inhibition and corrosion prevention is achieved, significantly improving the overall durability and operational safety of the copper electrolyte conveying pipe 100.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A scale inhibition and corrosion prevention device for a copper electrolyte conveying pipeline, the conveying pipeline (100) having an inlet (110), an outlet (120), an outer pipe wall (130), and an inner pipe wall (140), characterized in that, The scale and corrosion inhibitor (200) includes: A scale inhibition component (210) is disposed on the outside of the outer pipe wall (130). The scale inhibition component (210) has a steam flow channel (220), the length of which is greater than the length of the conveying pipe (100). The scale inhibition component (210) is provided with a steam inlet (230) and a steam outlet (240). The steam inlet (230) is disposed near the liquid inlet (110), and the steam outlet (240) is disposed near the liquid outlet (120). The heat insulation layer (250) is disposed on the outside of the scale inhibitor component (210).

2. The scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines according to claim 1, characterized in that, The scale inhibition assembly (210) includes: The outer sleeve (211) is disposed on the outside of the outer tube wall (130) and forms a steam containment space between the outer sleeve (211) and the steam inlet (230) and the steam outlet (240) are both connected to the containment space; A flow deflector structure (212) is disposed in the accommodating space, and the flow deflector structure (212) encloses and forms the flow channel (220).

3. The scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines according to claim 2, characterized in that, The flow deflection structure (212) is a spiral fin (213). The inner wall of the spiral fin (213) is fixedly connected to the outer pipe wall (130), and the outer wall of the spiral fin (213) is fixedly connected to the outer sleeve (211). The spiral fin (213) extends spirally along the axial direction of the conveying pipe (100) to form a continuously spirally closed flow channel (220).

4. The scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines according to claim 2, characterized in that, The flow deflector structure (212) includes multiple bow-shaped baffles (214), which are semi-circular or partially circular. The multiple bow-shaped baffles (214) are arranged at intervals perpendicular to the axial direction of the conveying pipe (100). The edges of the bow-shaped baffles (214) are connected to the outer pipe wall (130) or the outer sleeve (211), and adjacent bow-shaped baffles (214) are staggered to form the zigzag flow channel (220).

5. The scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines according to claim 2, characterized in that, The flow deflector structure (212) includes a plurality of alternately spaced annular baffles (215). In any two adjacent annular baffles (215), the inner edge of one annular baffle (215) is fixedly connected to the outer pipe wall (130), and the outer edge of the other annular baffle (215) is fixedly connected to the outer sleeve (211), forming a radially radial flow channel (220).

6. The scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines according to claim 1, characterized in that, The scale inhibitor component (210) is a semi-pipe structure. The semi-pipe structure extends spirally along the axial direction of the conveying pipe (100) and is fixedly connected to the outer pipe wall (130). The semi-pipe structure encloses and forms a continuous spiral flow channel (220).

7. The scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines according to claim 1, characterized in that, The scale inhibitor component (210) is a coil structure (216), which extends spirally along the axial direction of the conveying pipe (100). The inner wall of the coil structure (216) is fixedly connected to the outer pipe wall (130), and the coil structure (216) itself encloses to form a continuous spiral flow channel (220).

8. The scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines according to claim 1, characterized in that, Both the steam inlet (230) and the steam outlet (240) are provided with a first connecting joint (217), and both the liquid inlet (110) and the liquid outlet (120) are provided with a second connecting joint (150). Both the first connecting joint (217) and the second connecting joint (150) are flange interfaces.

9. The scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines according to claim 1, characterized in that, The inner pipe wall (140) is provided with an anti-corrosion layer (260), and the anti-corrosion layer (260) satisfies: Coating adhesion ≥6MPa; and / or, After immersion in copper electrolyte at 60℃ for 1000 hours, the anti-corrosion layer (260) showed no peeling or cracking; and / or, The thickness of the anti-corrosion layer (260) is 0.4-1.0 mm.

10. The scale inhibition and corrosion prevention device for copper electrolyte conveying pipelines according to claim 1, characterized in that, The thickness of the insulation layer (250) is 40-70mm.

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