Drawing method of high-purity nickel wire

Abstract

The application provides a drawing method of high-purity nickel wire and belongs to the field of nickel wire preparation.The method comprises the following steps: performing acid-free descaling on a nickel coil rod, wherein the acid-free descaling comprises laser descaling and abrasive belt polishing; and performing lubricating drawing on the nickel coil rod after the acid-free descaling by using a micro-electric water-based lubricating liquid, and then performing annealing to obtain high-purity nickel wire.Through the acid-free descaling process, the acid washing process is avoided, the surface oxide scale of the hot-rolled coil rod is removed without any pollution, and the solid waste pollutants such as acid mist, waste water and neutralizing mud are eliminated; through the micro-electric water-based lubricant drawing technology, the coating and soap powder pollutants are eliminated, and the links of generating hazardous waste such as wire drawing cleaning and oil lubrication are removed.Meanwhile, the wire drawing production process route is shortened, and the environmentally-friendly and efficient drawing production is realized.

Description

Technical Field

[0001] This application relates to the field of nickel wire preparation technology, and in particular to a method for drawing high-purity nickel wire. Background Technology

[0002] Driven by the dual-carbon goal, water electrolysis for hydrogen production will be the main method for producing green hydrogen energy, and the commonly used alkaline electrolyzer electrode is a nickel mesh. The nickel mesh is woven from high-purity nickel wire, with a wire diameter of approximately 0.12 mm to 0.30 mm. Pure nickel wire has the characteristics of good strength at high temperatures, good plasticity, good thermal conductivity, and low resistivity. It is also resistant to strong alkalis, neutral and weak acids, and its performance is stable in air, fresh water, and seawater.

[0003] Pure nickel wire production is mainly small-scale, and the drawing process involves pickling, coating, baking, lubrication powder application, drawing oil application, and annealing. Pickling of wire rods for descaling results in significant metal loss and generates acidic fumes and wastewater, leading to high treatment costs. During the drawing of coarse-gauge nickel wire, dust emissions from coatings and lubricating powders are unavoidable, and post-drawing cleaning with acids and alkalis is necessary. For micro-fine nickel wire drawing, drawing oil and its emulsions are commonly used as lubricants. However, drawing oil is a hazardous chemical, and its use, management, and storage are strictly controlled. Long-term use of waste oil results in hazardous waste that is difficult and expensive to treat, and its total emissions are strictly controlled. Furthermore, both Ca-based and Na-based drawing powders contain significant amounts of carbon. If the wire surface is not thoroughly cleaned before bright annealing, carbon accumulation will occur during the process. Traditional drawing processes are prone to causing pollution from acid mist and alkali mist, hazardous waste, and water, resulting in an unfriendly working environment. Therefore, there is an urgent need to develop a clean and efficient pure nickel wire drawing process. Summary of the Invention

[0004] This application provides a method for drawing high-purity nickel wire to solve the technical problems of acid mist, alkali mist pollution, hazardous waste pollution, and water pollution that are easily caused by traditional drawing processes.

[0005] In a first aspect, this application provides a method for drawing high-purity nickel wire, the method comprising:

[0006] Acid-free descaling is performed on nickel wire rods, which includes laser descaling and belt grinding.

[0007] The nickel wire rods, after descaling without acid, are lubricated and drawn using a micro-electric water-based lubricant, followed by annealing to obtain high-purity nickel wire. The chemical composition of the micro-electric water-based lubricant consists of alkaline micro-electric water, cutting fluid stock solution, and surfactant.

[0008] Optionally, the content of the alkaline micro-electrolyte water is 85% to 90% by mass fraction, and the total content of the cutting fluid stock solution and the surfactant is 10% to 15%.

[0009] Optionally, the refractive index of the micro-electric water-based lubricant is 5.0 to 8.0, and the pH value of the alkaline micro-electric water is 13 to 14.

[0010] Optionally, the laser descaling process uses three pulsed lasers, which are arranged in a triangular pattern.

[0011] Optionally, the scanning speed of the pulsed laser is 1.8 m / min to 2.4 m / min.

[0012] Optionally, the belt abrasion is performed by using two sets of four abrasive belts with a mesh size of 40 to 100 in sequence.

[0013] Optionally, the four abrasive belts have mesh sizes of 40 mesh, 40 mesh, 60 mesh, and 100 mesh, respectively.

[0014] Optionally, the method further includes:

[0015] Nickel ingots are hot-rolled and air-cooled to obtain nickel wire rods; wherein the final rolling temperature of the hot rolling is 800℃~850℃, and the final temperature of the air cooling is room temperature.

[0016] Optionally, the diameter Φ of the nickel wire rod is 7.0 mm to 10 mm.

[0017] Secondly, this application provides a high-purity nickel wire prepared by the method described in any one of the embodiments of the first aspect, wherein the diameter Φ of the high-purity nickel wire is 0.10 mm to 0.30 mm, and the high-purity nickel wire satisfies at least one of the following properties: tensile strength ≥ 395 MPa and elongation ≥ 22%.

[0018] The technical solutions provided in this application have the following advantages compared with the prior art:

[0019] This application achieves "zero" pollution removal of oxide scale from the surface of hot-rolled wire rod by adopting an acid-free descaling process, eliminating the need for pickling and thus eliminating solid waste pollutants such as acid mist, wastewater, and neutralization sludge. Furthermore, by employing micro-electric water-based lubricant drawing technology, it eliminates coating and soap powder pollutants, as well as hazardous waste-generating processes such as wire drawing cleaning and oil lubrication. Simultaneously, it shortens the wire drawing production process, achieving environmentally friendly and efficient drawing production. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic flowchart of a high-purity nickel wire drawing method provided in an embodiment of this application. Detailed Implementation

[0023] 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.

[0024] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.

[0025] Furthermore, in the description of this application, the terms "comprising," "including," etc., mean "including but not limited to." In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this document, "and / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone. A and B can be singular or plural. In this document, "at least one" means one or more, and "more than" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c" or "at least one of a, b, and c" can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be a single or multiple.

[0026] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0027] Firstly, this application provides a method for drawing high-purity nickel wire; please refer to [link to relevant documentation]. Figure 1 The method includes:

[0028] S1. Hot rolling and air cooling of nickel ingots to obtain nickel wire rods;

[0029] In some embodiments, the final rolling temperature of the hot rolling is 800°C to 850°C; and / or, the final temperature of the air cooling is room temperature, and the air cooling time is ≥12h.

[0030] The final rolling temperature of the hot rolling can be 800℃, 810℃, 820℃, 830℃, 840℃, 850℃, etc.; the final air cooling temperature can be 15℃, 20℃, 25℃, 30℃, 35℃, etc.; and the air cooling time can be 12h, 13h, 14h, 15h, 16h, 17h, 18h, etc.

[0031] In some embodiments, the diameter Φ of the nickel wire rod is 7.0 mm to 10 mm.

[0032] For example, the diameter Φ of the nickel wire rod can be 7.0mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc.

[0033] S2. Perform acid-free descaling on the nickel wire rod, which includes laser descaling and belt grinding.

[0034] Detailed explanation of laser descaling and belt polishing in this application:

[0035] Laser descaling: This method utilizes a high-energy-density laser beam to directly irradiate the surface of the workpiece. The rust layer absorbs the laser energy and rapidly heats up, triggering a series of physical effects such as combustion and vaporization, thermal shock and vibration, and acoustic shattering. Ultimately, this removes contaminants from the workpiece without damaging it. Laser descaling is non-contact, causing no physical damage to the material, and offers advantages such as environmental friendliness, high cleanliness, and good controllability.

[0036] Belt grinding: The abrasive belt makes flexible contact with the workpiece, providing good break-in and polishing effects. Grinding often requires a gradual progression from coarse to fine abrasive. Multiple belts allow for sequential grinding operations after the workpiece is positioned once, resulting in high efficiency. Coarse abrasive belts typically have a grit of 36-60, producing a rough grinding effect. They are suitable for deburring, removing weld slag, and refinishing rough surfaces. Medium abrasive belts typically have a grit of 80-120, providing a moderate grinding effect. They are suitable for refinishing surfaces, removing old paint, and removing minor scratches. Fine abrasive belts typically have a grit of 150-240, producing a fine grinding effect, suitable for high-efficiency precision grinding applications such as lubrication and polishing.

[0037] In some embodiments, the laser descaling uses three pulsed lasers arranged in a triangular pattern; the scanning speed of the pulsed lasers is 1.8 m / min to 2.4 m / min.

[0038] In some embodiments, the belt abrasion is performed by sequentially using four abrasive belts of 40-100 mesh in two sets.

[0039] In some embodiments, the four abrasive belts have mesh counts of 40 mesh, 40 mesh, 60 mesh, and 100 mesh, respectively.

[0040] To ensure optimal surface descaling, a "laser cleaning + belt abrasion" process is employed, reducing the metal loss rate from 3% to 2% compared to the original acid pickling process. Three pulsed lasers are arranged at 120-degree angles to ensure the wire rod is cleaned from all angles, leaving no blind spots. The belt abrasion device uses two sets of four abrasive belts ranging from 40 to 100 grit to ensure comprehensive abrasion. The process is designed with the first two belts at 40 grit, and the latter two at 60 and 100 grit respectively, resulting in a surface quality sufficient for subsequent processes. For example, the scanning speed of the pulsed lasers can be 1.8 m / min, 1.9 m / min, 2.0 m / min, 2.1 m / min, 2.2 m / min, 2.3 m / min, 2.4 m / min, etc.

[0041] In some embodiments, the acid-free descaling includes contact mechanical descaling technology, non-contact reduction descaling technology, and emerging plasma descaling and laser rust removal technologies.

[0042] S3. The acid-free descaling nickel wire rod is lubricated and drawn using a micro-electric water-based lubricant, and then annealed to obtain high-purity nickel wire.

[0043] In some embodiments, the chemical composition of the micro-electric water-based lubricant is alkaline micro-electric water, cutting fluid stock solution, and surfactant; wherein, by mass fraction, the content of the alkaline micro-electric water is 85% to 90%, and the total content of the cutting fluid stock solution and the surfactant is 10% to 15%.

[0044] In some embodiments, the refractive index of the micro-electric water-based lubricant is 5.0 to 8.0, and the pH value of the alkaline micro-electric water is 13 to 14.

[0045] Micro-electrolyzed water is an alkaline electrolyzed water with strong reducing power, a high pH value, water molecule clusters composed of only 6 water molecules, ionization, and strong dissolving and penetrating power. It does not corrode human skin and is an environmentally friendly, pollution-free solvent suitable for industrial production. When the pH value of micro-electrolyzed water is above 12, its oxidation-reduction potential is -700mV to -1000mV, indicating its strong reducing ability. Cutting fluid is an industrial liquid used in metal cutting and grinding processes to cool and lubricate cutting tools and workpieces. Its main component is mineral oil; surfactants reduce surface tension, and a series of physicochemical reactions occur between dirt and solid surfaces (such as wetting, penetration, emulsification, solubilization, dispersion, and foaming), achieving a cleaning effect with the aid of mechanical agitation. With the aim of optimizing traditional production processes and reducing hazardous waste emissions, alkaline micro-electrolyzed water is introduced as the main solvent of a water-based lubricant. This utilizes its lubricating properties, high small-molecule permeability, good cleaning effect, and alkaline antibacterial effect. Combined with a suitable solute, a high-performance alkaline micro-electrolyzed water-based lubricant is obtained. For example, the content of the alkaline micro-electrolyzed water can be 85%, 86%, 87%, 88%, 89%, 90%, etc.; the total content of the cutting fluid stock solution and the surfactant can be 10%, 11%, 12%, 13%, 14%, 15%, etc.; the refractive index of the micro-electrolyzed water-based lubricant can be 5.0, 6.0, 7.0, 8.0, etc.; and the pH value of the alkaline micro-electrolyzed water can be 13, 13.2, 13.5, 13.7, 14, etc.

[0046] The surface color and smoothness of the finished nickel microwires drawn using alkaline micro-electric water-based lubricant are not significantly different from those of oil-drawn finished products, which can meet the quality requirements of finished products. At the same time, the metal powder dispersed in the alkaline micro-electric water-based lubricant can achieve good deposition after standing for 1 to 2 days, and is easy to separate from the lubricant. The deposits (mainly nickel oxides) are collected and air-dried naturally, and can be returned to smelting for reuse.

[0047] Secondly, this application provides a high-purity nickel wire prepared by the method described in any one of the embodiments of the first aspect, wherein the diameter Φ of the high-purity nickel wire is 0.10 mm to 0.30 mm, and the high-purity nickel wire satisfies at least one of the following properties: tensile strength ≥ 395 MPa and elongation ≥ 22%.

[0048] The high-purity nickel wire obtained by the method of this application can meet the quality requirements of the finished product. For example, the diameter Φ of the high-purity nickel wire can be 0.10mm, 0.12mm, 0.15mm, 0.18mm, 0.20mm, 0.22mm, 0.25mm, 0.28mm, 0.30mm, etc.; the tensile strength of the high-purity nickel wire can be 395MPa, 400MPa, 405MPa, 410MPa, 415MPa, 420MPa, 430MPa, 440MPa, 445MPa, 450MPa, etc.; and the elongation of the high-purity nickel wire can be 22%, 23%, 24%, 25%, 26%, 27%, etc.

[0049] The present application is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the application. Experimental methods in the following embodiments that do not specify specific conditions are generally determined according to national standards. If there is no corresponding national standard, then general international standards, conventional conditions, or conditions recommended by the manufacturer are followed.

[0050] In Examples 1-3 of this application, the first two abrasive belts used for belt grinding are both 40 mesh, and the last two abrasive belts are 60 mesh and 100 mesh respectively; laser descaling uses three pulsed lasers arranged at 120 degrees; the chemical composition and mass fraction of the micro-electric water-based lubricant used are as follows: the content of alkaline micro-electric water is 88%, and the total content of the cutting fluid stock solution and the surfactant is 12%.

[0051] Example 1

[0052] Producing 0.28mm annealed N6 pure nickel wire

[0053] The process flow is as follows: hot-rolled high-purity nickel wire rod with a diameter of Φ 7.0mm is sequentially air-cooled to room temperature (air-cooling time is 13h), laser descaling (laser scanning speed 2.2m / min), belt grinding, 6-die micro-electric water-based lubrication drawing, and annealing (annealing temperature 800 degrees) to obtain 1.0mm nickel wire.

[0054] A 1.0 mm nickel wire was sequentially drawn using a 19-die micro-electric water-based lubrication system and then hydrogen-annealed in a three-meter annealing furnace to obtain a 0.28 mm annealed finished nickel wire. The finished nickel wire had a diameter of Φ0.283 mm, a tensile strength of 412 MPa, and an elongation of 25%.

[0055] Example 2

[0056] Producing 0.10mm annealed N6 pure nickel wire

[0057] The process flow is as follows: hot-rolled high-purity nickel wire rod with a diameter of Φ8.0mm is sequentially air-cooled to room temperature (air-cooling time is 12.5h), laser descaling (laser scanning speed 2.1m / min), belt grinding, 6-die micro-electric water-based lubrication drawing, and annealing (annealing temperature 800 degrees) to obtain 1.0mm nickel wire.

[0058] A 1.0 mm nickel wire was sequentially drawn using a 19-stage micro-electric water-based lubrication system to obtain a 0.20 mm cold-state nickel wire;

[0059] A 0.20mm cold nickel wire was sequentially drawn using a 14-die micro-electric water-based lubrication system and then hydrogen-annealed in a two-meter annealing furnace to obtain a 0.10mm annealed finished nickel wire. The finished nickel wire had a diameter of Φ0.102mm, a tensile strength of 430MPa, and an elongation of 26%.

[0060] Example 3

[0061] Producing 0.16mm annealed N4 pure nickel wire

[0062] The process flow is as follows: hot-rolled high-purity nickel wire rod with a diameter of Φ 8.5mm is sequentially air-cooled to room temperature (air-cooling time is 14h), laser descaling (laser scanning speed 2.0m / min), belt grinding, 6-die micro-electric water-based lubrication drawing, and annealing (annealing temperature 800 degrees) to obtain 1.0mm nickel wire.

[0063] A 1.0 mm nickel wire was sequentially drawn using a 19-stage micro-electric water-based lubrication system to obtain a 0.25 mm cold-state nickel wire;

[0064] A 0.25mm cold nickel wire was sequentially drawn using a 14-die micro-electric water-based lubrication system and then hydrogen-annealed in a two-meter annealing furnace to obtain a 0.16mm annealed finished nickel wire. The finished nickel wire had a diameter of Φ0.159mm, a tensile strength of 395MPa, and an elongation of 22%.

[0065] Comparative Example 1

[0066] Producing 0.28mm annealed N6 pure nickel wire

[0067] The process flow is as follows: hot-rolled high-purity nickel wire rod with a diameter of Φ of 7.0mm is subjected to natural cooling, alkali quenching, pickling (time greater than 90min), cleaning, coating, baking (temperature greater than 200℃, time greater than 2h), dry powder drawing, cleaning, and annealing (annealing temperature 800℃) to obtain 1.0mm nickel wire.

[0068] A 1.0mm nickel wire was sequentially drawn using 19-die oil drawing and then hydrogen-annealed in a three-meter annealing furnace to obtain a 0.28mm annealed nickel wire. The finished nickel wire had a diameter of Φ0.279mm, a tensile strength of 405MPa, and an elongation of 26%.

[0069] As can be seen from Examples 1-3 and Comparative Example 1, the high-purity nickel wire obtained by this method has no significant difference in tensile strength and elongation compared with the high-purity nickel wire obtained by traditional wire oil drawing, and can meet the quality requirements of the finished product.

[0070] Furthermore, one or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0071] In this embodiment of the invention, acid-free descaling (laser descaling + belt abrasion) is used instead of acid washing process to eliminate acid mist and alkali mist pollution, hazardous waste pollution and water pollution caused by the application of "alkali fumes + acid washing" technology, create a good working environment, reduce material loss and improve economic and environmental benefits.

[0072] In this embodiment of the invention, the drawn metal powder is dispersed in an alkaline micro-electric water-based lubricating fluid. After standing for 1 to 2 days, it can achieve good deposition and is easy to separate from the lubricating fluid. The deposits (mainly nickel oxide) are collected and air-dried naturally, and can be returned to smelting for reuse, thus saving resources.

[0073] 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 method for drawing high-purity nickel wire, characterized in that, The method includes: Nickel ingots are hot-rolled and air-cooled to obtain nickel wire rods; wherein the final rolling temperature of the hot rolling is 800℃~850℃, and the final temperature of the air cooling is room temperature; The nickel wire rod is descaled without acid, which includes laser descaling and belt polishing. The laser descaling uses three pulsed lasers arranged in a triangular pattern. The belt polishing uses two sets of four belts with mesh sizes of 40 to 100 grit, which are polished sequentially. The nickel wire rod, after descaling without acid, is lubricated and drawn using a micro-electric water-based lubricant, followed by annealing to obtain high-purity nickel wire. The chemical composition of the micro-electric water-based lubricant consists of alkaline micro-electric water, cutting fluid stock solution, and surfactant. By mass fraction, the content of alkaline micro-electric water is 85%~90%, the total content of the cutting fluid stock solution and the surfactant is 10%~15%, the refractive index of the micro-electric water-based lubricant is 5.0~8.0, and the pH value of the alkaline micro-electric water is 13~14.

2. The method according to claim 1, characterized in that, The scanning speed of the pulsed laser is 1.8 m / min to 2.4 m / min.

3. The method according to claim 1, characterized in that, The diameter Φ of the nickel wire rod is 7.0mm~10mm.

4. A high-purity nickel wire prepared by the method according to any one of claims 1-3, characterized in that, The high-purity nickel wire has a diameter Φ of 0.10mm to 0.30mm and meets at least one of the following properties: tensile strength ≥395MPa and elongation ≥22%.

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