High-conductivity conductive structure for hydrometallurgy and preparation method thereof

Abstract

The invention provides a high-conductivity conductive structure for hydrometallurgy and a preparation method thereof.The conductive structure comprises a conductive copper beam, a corrosion-resistant metal layer and conductive heads, the corrosion-resistant metal layer is arranged outside the conductive copper beam in a gapless mode, and the lower end faces of the two ends of the conductive copper beam are connected with the conductive heads; the conductive head and the conductive copper beam are connected through a tenon-and-mortise structure. According to the high-conductivity conductive structure for hydrometallurgy provided by the invention, the conductive copper beam and the corrosion-resistant metal pipe are compositely connected, then the conductive head is processed into the tenon, the conductive copper beam is processed into the mortise, and the conductive head is embedded into the conductive copper beam by adopting a tenon-and-mortise structure, so that the whole copper beam part can be ensured not to introduce a new material for rolling; consistency of conduction of the copper beam is guaranteed, high-performance conduction requirements are met, the problem that power consumption is increased due to the fact that an existing conductive copper head is prone to corrosion and falling off is solved, and ohmic drop caused by the conductive beam is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrometallurgical electrodeposition, and particularly relates to a high-conductivity conductive structure for hydrometallurgy and a preparation method thereof. Background Art

[0002] Electrolysis of cathode zinc consumes a large amount of electricity. For a zinc plant with an annual output of 100,000 tons, the annual electricity consumption is as high as 300-400 million KWh. The current efficiency of electrolytic zinc is about 60-70%. During the work process, there is a large amount of energy loss, and the potential for energy saving and consumption reduction is huge.

[0003] In the zinc electrolysis process, the current provided by the rectifier passes through the copper busbar and then the conductive beam, delivering a small current to each plate. The anions and cations in the electrolyte undergo electrolysis under the action of the electric field. The conductive beam is an important carrier for the current to be transmitted to the single plate. In the existing mainstream overlapping conductive method, the conductive copper head of the plate is directly embedded in the copper beam. With the increase of service life, the electrolyte and acid mist erode and corrode the joint, causing the conductive copper head to fall off, increasing the current-carrying resistance of the conductive beam, thereby affecting the uniformity of the current flow from the conductive rod to the plate, resulting in uneven current distribution. During the electrolysis process, the cathode product grows unevenly on the cathode plate surface, which can easily cause distortion of the cathode plate surface, shortening the service life of the cathode plate, causing inter-electrode short circuits, and increasing power consumption. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-conductivity conductive structure for hydrometallurgy to solve the problem that the current conductive copper head is easily corroded and falls off, resulting in increased power consumption.

[0005] Another object of the present invention is to provide a method for preparing a high-conductivity conductive structure for hydrometallurgy, which uses three processes: high-frequency induction welding, high-temperature rolling and cold bonding to mechanically composite the dissimilar metal tube with the internal copper beam.

[0006] To this end, the technical solutions provided by the present invention are as follows: A high-conductivity conductive structure for hydrometallurgy includes a conductive copper beam, a corrosion-resistant metal layer and a conductive head. The corrosion-resistant metal layer is arranged without a gap outside the conductive copper beam. The lower end surfaces of both ends of the conductive copper beam are connected to the conductive heads. The conductive heads and the conductive copper beam are connected by a mortise and tenon structure. The corrosion-resistant metal layer is stainless steel or titanium.

[0007] The mortise and tenon structure includes a tenon and a tenon groove, wherein the tenon is arranged on the upper end surface of the conductive head, and the tenon groove is opened on the conductive copper beam. The tenon is inserted into the tenon groove and the two are fully fitted together.

[0008] The tenons are right-angle tenons, dovetail tenons or round tenons; according to the quantity, the tenons are divided into single tenons and multiple tenons.

[0009] The tenon and the mortise are combined in an open mortise, a closed mortise, a semi-closed mortise or a through mortise.

[0010] A method for preparing a high-conductivity conductive structure for hydrometallurgy, comprising the following steps: Step 1) cleaning and washing the corrosion-resistant metal pipe and the conductive copper beam; Step 2) mechanically compounding the corrosion-resistant metal tube and the conductive copper beam so that the corrosion-resistant metal tube covers the conductive copper beam to form a corrosion-resistant metal layer; Step 3) Process a tenon on the upper end face of the conductive head, and process a tenon groove on both ends of the conductive copper beam that has been mechanically composited. Insert the tenon into the tenon groove, and fully fit the conductive head and the conductive copper beam.

[0011] The specific cleaning process of step 1) is as follows: Degreasing and cleaning: Place the corrosion-resistant metal tube and conductive copper beam in an ultrasonic cleaning machine, add organic solvent acetone, set the temperature to 30-35°C, and clean for 5-10 minutes to remove oil stains on the inner surface of the corrosion-resistant metal tube and the surface of the conductive copper beam; Mechanical cleaning: After degreasing and cleaning, use 600-800 mesh metallographic sandpaper to polish the inside of the metal tube and the surface of the conductive copper beam to remove the oxide film until the metallic luster is exposed.

[0012] The specific cleaning process of step 1) is as follows: After cleaning, the corroded metal pipes and conductive copper beams are scrubbed with organic solvent acetone to remove surface dirt, and then alkaline washed with a NaOH solution with a mass concentration of 5% to 10% for 3 to 7 minutes at a temperature of 40°C to 70°C, followed by washing with running water, followed by acid washing with a 30-40% HNO3 solution at room temperature to 60°C for 1 to 3 minutes, and finally rinsed with running water, blown dry with a hair dryer or allowed to dry naturally.

[0013] Step 2) Mechanical bonding is achieved by high frequency induction welding, high temperature rolling or cold lamination.

[0014] The high-frequency induction welding process is as follows: A corrosion-resistant metal tube, lead-free solder wire SnCu0.7, and T2 copper as conductive copper beams are sequentially placed into a high-frequency induction welding machine. Utilizing the volume repulsion of T2 copper and the capillary action of the solder, the molten lead-free solder wire SnCu0.7 rises to expel air until the gap in the entire steel-clad copper structure is filled. The high temperature rolling process is as follows: The outer side of the conductive copper beam is evenly coated with a high-temperature bonding coupling agent, and then the corrosion-resistant layer is wrapped around the outer side. The beam is heated to 400-450°C in a tube furnace and then rolled under high temperature and pressure to form a whole. The cold lamination process is as follows: The conductive copper beam is directly inserted into the corrosion-resistant metal tube, and then a press is used to perform high-strength extrusion in the middle of the tube to achieve cold bonding between the corrosion-resistant metal tube and the conductive copper beam.

[0015] The beneficial effects of the present invention are: The high-conductivity conductive structure for hydrometallurgy provided by the present invention compositely connects a conductive copper beam with a corrosion-resistant metal tube, then processes the conductive head into a tenon, processes a tenon groove into the conductive copper beam, and uses a mortise and tenon structure to embed the conductive head into the conductive copper beam. This ensures that no new material is introduced into the rolling of the entire copper beam, ensures the consistency of the copper beam's conductivity, meets high-performance conductive requirements, solves the current problem of increased power consumption caused by the easy corrosion and shedding of the conductive copper head, and reduces the ohmic drop caused by the conductive beam.

[0016] The method of the present invention mechanically combines the dissimilar metal tube with the conductive copper beam inside it through high-frequency induction welding, high-temperature rolling, or cold lamination. During high-frequency induction welding, the molten lead-free SnCu0.7 solder rises to displace air and fill the gaps in the entire clad copper structure. High-temperature rolling bonds the conductive copper beam to the corrosion-resistant layer. Cold lamination achieves a gapless bond between the corrosion-resistant metal tube and the conductive copper beam under pressure, forming a composite structure that improves the corrosion resistance and electrical conductivity of the conductive copper beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a first embodiment of the present invention; Figure 2 It is a structural schematic diagram of a second embodiment of the present invention; Figure 3 It is a schematic structural diagram of a third embodiment of the present invention; Figure 4 1 is a schematic structural diagram of a fourth embodiment of the present invention; Figure 5 1 is a schematic structural diagram of a fifth embodiment of the present invention; Figure 6 It is a schematic structural diagram of a conductive copper beam according to a fifth embodiment of the present invention.

[0018] In the figure: 1. Conductive copper beam; 2. Corrosion-resistant metal layer; 3. Conductive head; 4. Tenon; 5. Mortise. DETAILED DESCRIPTION

[0019] The following describes the embodiments of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0020] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so as to provide a thorough and complete disclosure of the present invention and fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0021] Unless otherwise specified, the terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have meanings consistent with the context of their relevant fields and should not be interpreted as idealized or overly formal.

[0022] Example 1 The present invention provides a high-conductivity conductive structure for hydrometallurgy, comprising a conductive copper beam 1, a corrosion-resistant metal layer 2 and a conductive head 3. The corrosion-resistant metal layer 2 is seamlessly arranged outside the conductive copper beam 1. The lower end surfaces of both ends of the conductive copper beam 1 are connected to the conductive heads 3. The conductive heads 3 and the conductive copper beam 1 are connected by a mortise and tenon structure. The high-conductivity conductive structure for hydrometallurgy provided by the present invention compositely connects a conductive copper beam 1 with a corrosion-resistant metal tube, then processes the conductive head 3 into a tenon 4, and processes a tenon groove 5 into the conductive copper beam 1. The conductive head 3 is embedded in the conductive copper beam 1 using a mortise and tenon structure. This ensures that no new material is introduced into the rolling of the entire copper beam, ensures the consistency of the copper beam's conductivity, meets high-performance conductive requirements, and reduces the ohmic drop caused by the conductive beam.

[0023] Example 2 Based on Example 1, this example provides a high-conductivity conductive structure for hydrometallurgy, wherein the corrosion-resistant metal layer 2 is made of stainless steel or titanium.

[0024] The 316L stainless steel tube or titanium tube has strong corrosion resistance and is wrapped around the conductive copper beam 1 to improve the corrosion resistance of the conductive beam and extend its service life.

[0025] Example 3 Based on Example 1, this embodiment provides a high-conductivity conductive structure for hydrometallurgy, wherein the mortise and tenon structure includes a tenon 4 and a tenon groove 5, wherein the tenon 4 is provided on the upper end surface of the conductive head 3, and the tenon groove 5 is provided on the conductive copper beam 1, and the tenon 4 is inserted into the tenon groove 5 and the two are fully fitted together.

[0026] The conductive head 3 and the conductive copper beam 1 are connected by a mortise and tenon structure, and no other connectors are required. This ensures that no new material rolling is introduced into the entire conductive copper beam 1, ensuring the consistency of the conductive copper beam 1.

[0027] Example 4 Based on Example 3, this embodiment provides a high-conductivity conductive structure for hydrometallurgy, wherein the tenon 4 is a right-angle tenon, a dovetail tenon or a round tenon; according to the quantity, the tenon 4 is divided into a single tenon and multiple tenons.

[0028] The tenon 4 and the mortise 5 are connected in an open mortise, a closed mortise, a semi-closed mortise or a through mortise.

[0029] In the mortise and tenon structure, two components are connected mainly by combining concave and convex parts, where the convex part is called the tenon 4 and the concave part is called the mortise (mortise 5, such as Figure 6 As shown). According to the shape of the tenon 4, it can be processed into a right-angle tenon, a dovetail tenon, a round tenon, etc. According to the combination of the tenon 4 and the mortise 5, it can be divided into an open tenon, a closed tenon, a semi-closed tenon, a through tenon, etc. According to the number of the tenons 4, it can be divided into a single tenon and a multiple tenon. Figure 2 and Figure 5 As shown, it is a single tenon; Figure 3 As shown, it is a double tenon; Figure 4 T-shaped tenon shown. like Figure 1 As shown, the copper conductive head 3 is processed into a tenon 4 (tenon), which is a round tenon, and a tenon groove 5 (mortise) is milled out at one end of the conductive copper beam 1 that has been composited using a lathe. The processing size of the tenon 4 can be positively deviated according to the situation to ensure that the tenon 4 and the tenon groove 5 are fully fitted.

[0030] Example 5 This embodiment provides a method for preparing a high-conductivity conductive structure for hydrometallurgy, comprising the following steps: Step 1) cleaning and washing the corrosion-resistant metal tube and the conductive copper beam 1; Step 2) mechanically compounding the corrosion-resistant metal tube and the conductive copper beam 1 so that the corrosion-resistant metal tube covers the conductive copper beam to form a corrosion-resistant metal layer 2; Step 3) Process tenons 4 on the upper end surface of the conductive head 3, and process tenons 5 on both ends of the conductive copper beam 1 that has been mechanically composited. Insert the tenons 4 into the tenons 5 to ensure that the conductive head 3 and the conductive copper beam 1 are fully fitted.

[0031] Clean the corrosion-resistant metal tube and the conductive copper beam 1 to remove oil stains on the inner surface of the tube and the surface of the conductive copper beam 1 caused by production and processing. Do not store the workpiece for a long time after cleaning and cleaning. The shorter the interval between cleaning and welding in mechanical compounding, the better. Because long storage time will cause the weldment surface to come into contact with oxygen in the air for a long time and re-oxidize to form an oxide film, especially in a humid environment. Generally, welding should be ensured within 2 hours.

[0032] Example 6 Based on Example 5, this example provides a method for preparing a conductive structure with high conductivity for hydrometallurgy. The specific cleaning process of step 1) is as follows: Degreasing and cleaning: Place the corrosion-resistant metal tube and the conductive copper beam 1 in an ultrasonic cleaning machine, add the organic solvent acetone, set the temperature to 30-35°C, and clean for 5-10 minutes to remove the oil stains on the inner surface of the corrosion-resistant metal tube and the surface of the conductive copper beam 1; Mechanical cleaning: After degreasing and cleaning, use 600-800 mesh metallographic sandpaper to polish the inside of the metal tube and the surface of the conductive copper beam 1 to remove the oxide film until the metallic luster is exposed.

[0033] The specific cleaning process of step 1) is as follows: After cleaning, the corroded metal tube and the conductive copper beam 1 are scrubbed with an organic solvent acetone to remove surface dirt, and then alkaline washed with a NaOH solution with a mass concentration of 5% to 10% for 3 to 7 minutes at a temperature of 40°C to 70°C, and then washed with running water. Next, acid washed with a 30-40% HNO3 solution at room temperature to 60°C for 1 to 3 minutes, and finally rinsed with running water, and blown dry with a hair dryer or allowed to dry naturally.

[0034] Using the principle of like dissolves like, use acetone to remove oil stains; use friction to remove oxide films.

[0035] Example 7 Based on Example 5, this example provides a method for preparing a conductive structure with high conductivity for hydrometallurgy, wherein step 2) mechanical bonding is achieved by high-frequency induction welding, high-temperature rolling or cold lamination.

[0036] The high-frequency induction welding process is as follows: A corrosion-resistant metal tube, lead-free solder wire SnCu0.7, and T2 copper as a conductive copper beam 1 are sequentially placed into a high-frequency induction welding machine. The volume repulsion of the T2 copper and the capillary action of the solder are used to make the liquid level of the molten lead-free solder wire SnCu0.7 rise and expel air until the gap of the entire steel-clad copper structure is filled. The high-temperature rolling process is as follows: the outer side of the conductive copper beam 1 is evenly coated with a high-temperature bonding coupling agent, and then the outer side is wrapped with two layers of corrosion-resistant metal, heated to 400-450°C in a tube furnace, and then rolled under high temperature and pressure to form an integral body; The cold bonding process is as follows: directly insert the conductive copper beam 1 into the corrosion-resistant metal tube, and then use a press to perform high-strength extrusion in the middle of the tube to achieve the composite of the corrosion-resistant metal tube and the conductive copper beam 1.

[0037] The above three processes achieve seamless bonding between the corrosion-resistant metal tube and the conductive copper beam 1 to form a composite structure, thereby improving the corrosion resistance and conductivity of the conductive copper beam 1.

[0038] The above examples are merely illustrative of the present invention and do not limit the scope of protection of the present invention. Any design that is identical or similar to the present invention falls within the scope of protection of the present invention.

Claims

1. A high-conductivity conductive structure for hydrometallurgy, characterized by: It includes a conductive copper beam, a corrosion-resistant metal layer and a conductive head. The corrosion-resistant metal layer is arranged outside the conductive copper beam without a gap. The lower end surfaces of both ends of the conductive copper beam are connected with conductive heads. The conductive head and the conductive copper beam are connected by a mortise and tenon structure.

2. The high-conductivity conductive structure for hydrometallurgy according to claim 1, characterized in that: The corrosion-resistant metal layer is stainless steel or titanium.

3. The high-conductivity conductive structure for hydrometallurgy according to claim 1, characterized in that: The mortise and tenon structure includes a tenon and a tenon groove, wherein the tenon is arranged on the upper end surface of the conductive head, and the tenon groove is opened on the conductive copper beam. The tenon is inserted into the tenon groove and the two are fully fitted together.

4. The high-conductivity conductive structure for hydrometallurgy according to claim 3, characterized in that: The tenons are right-angle tenons, dovetail tenons or round tenons; according to the quantity, the tenons are divided into single tenons and multiple tenons.

5. The high-conductivity conductive structure for hydrometallurgy according to claim 3, characterized in that: The tenon and the mortise are combined in an open mortise, a closed mortise, a semi-closed mortise or a through mortise.

6. The method for preparing a highly conductive conductive structure for hydrometallurgy according to any one of claims 1 to 5, wherein: The following steps are involved: Step 1) cleaning and washing the corrosion-resistant metal pipe and the conductive copper beam; Step 2) mechanically compounding the corrosion-resistant metal tube and the conductive copper beam so that the corrosion-resistant metal tube covers the conductive copper beam to form a corrosion-resistant metal layer; Step 3) Process a tenon on the upper end surface of the conductive head, and process a tenon groove on both ends of the conductive copper beam that has been mechanically composited. Insert the tenon into the tenon groove to ensure that the conductive head and the conductive copper beam are fully fitted.

7. The method for preparing a highly conductive conductive structure for hydrometallurgy according to claim 6, characterized in that: The specific cleaning process of step 1) is as follows: Degreasing and cleaning: Place the corrosion-resistant metal tube and conductive copper beam in an ultrasonic cleaning machine, add organic solvent acetone, set the temperature to 30-35°C, and clean for 5-10 minutes to remove oil stains on the inner surface of the corrosion-resistant metal tube and the surface of the conductive copper beam; Mechanical cleaning: After degreasing and cleaning, use 600-800 mesh metallographic sandpaper to polish the inside of the metal tube and the surface of the conductive copper beam to remove the oxide film until the metallic luster is exposed.

8. The method for preparing a highly conductive conductive structure for hydrometallurgy according to claim 6, wherein: The specific cleaning process of step 1) is as follows: After cleaning, the corroded metal pipes and conductive copper beams are scrubbed with organic solvent acetone to remove surface dirt, and then alkaline washed with a NaOH solution with a mass concentration of 5% to 10% for 3 to 7 minutes at a temperature of 40°C to 70°C, followed by washing with running water, followed by acid washing with a 30-40% HNO3 solution at room temperature to 60°C for 1 to 3 minutes, and finally rinsed with running water, blown dry with a hair dryer or allowed to dry naturally.

9. The method for preparing a highly conductive conductive structure for hydrometallurgy according to claim 6, wherein: Step 2) Mechanical bonding is achieved by high frequency induction welding, high temperature rolling or cold lamination.

10. The method for preparing a highly conductive conductive structure for hydrometallurgy according to claim 9, characterized in that: The high-frequency induction welding process is as follows: A corrosion-resistant metal tube, lead-free solder wire SnCu0.7, and T2 copper as conductive copper beams are sequentially placed into a high-frequency induction welding machine. Utilizing the volume repulsion of T2 copper and the capillary action of the solder, the molten lead-free solder wire SnCu0.7 rises to expel air until the gap in the entire steel-clad copper structure is filled. The high temperature rolling process is as follows: The outer side of the conductive copper beam is evenly coated with a high-temperature bonding coupling agent, and then the corrosion-resistant layer is wrapped around the outer side. The beam is heated to 400-450°C in a tube furnace and then rolled under high temperature and pressure to form a whole. The cold lamination process is as follows: The conductive copper beam is directly inserted into the corrosion-resistant metal tube, and then a press is used to perform high-strength extrusion in the middle of the tube to achieve cold bonding between the corrosion-resistant metal tube and the conductive copper beam.

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