Preparation method of low-impurity antioxidant rare earth cored wire and cored wire

Abstract

The present application relates to a kind of low-impurity antioxidant rare earth cored wire preparation method and cored wire, belong to rare earth cored wire preparation technical field, solve the problem that one of rare earth cored wire preparation process in prior art is easily oxidized, leading to high impurity content of cored wire, low cored wire production efficiency and poor cored wire antioxidant performance.The low-impurity antioxidant rare earth cored wire preparation method of the present application includes the following steps: S1, rare earth metal core material preparation;S2, rare earth ferrosilicon powder preparation;S3, body coating treatment;S4, outer coating treatment;S5, finished product detection and packaging.The present application realizes the efficient preparation of cored wire, prevents the oxidation of rare earth metal during smelting, reduces the impurity content in the raw material of cored wire, and improves the antioxidant performance of cored wire.

Description

Technical Field

[0001] This invention relates to the field of rare earth cored wire preparation technology, and in particular to a method for preparing low-impurity, oxidation-resistant rare earth cored wire and the cored wire itself. Background Technology

[0002] Rare earth elements are widely used as deep deoxidizers and desulfurizers in steel smelting and alloy preparation, playing a crucial role in refining grains, modifying non-metallic inclusions, and improving the overall mechanical properties of materials. In practical applications, to control the amount of rare earth elements added and the reaction process, rare earth metals are usually added using cored wires as carriers. This involves encasing the rare earth core material within a metal sheath, isolating it from the environmental medium during storage, transportation, and wire feeding, thereby reducing rare earth oxidation loss and increasing rare earth yield.

[0003] Currently, the core material of rare earth cored wires mostly uses rare earth metal powder or pure rare earth metal wire. Due to the extremely high chemical reactivity of rare earth elements, surface oxidation or deep oxidation of the rare earth core material is unavoidable in all stages of core material preparation and cored wire forming, including powder preparation, mixing, filling, and coating. This not only directly leads to a high content of oxidized impurities in the rare earth core material, but also causes the loss of effective rare earth components, affecting the rare earth yield and actual application performance.

[0004] Furthermore, existing cored wires mostly rely solely on the outer metal sheath as a single physical barrier to isolate air, making their protective measures relatively simple. Even when rare earth core materials are encased within a metal sheath, during long-term storage and transportation, external oxygen and moisture can still gradually penetrate due to factors such as changes in ambient temperature and humidity, as well as microscopic defects in the sheathing layer. This causes the core material to slowly oxidize, resulting in insufficient overall oxidation resistance of the cored wire and making it difficult to maintain its activity over a long period.

[0005] Furthermore, during the cored wire manufacturing process, especially in the rare earth metal smelting process, the smelting equipment lacks adequate protection, causing rare earth metals to easily oxidize upon contact with air, which severely restricts the production efficiency and product consistency of rare earth cored wires. Summary of the Invention

[0006] Based on the above analysis, the present invention aims to provide a method for preparing low-impurity, oxidation-resistant rare earth cored wire and the cored wire itself, in order to solve one of the problems in the existing rare earth cored wire preparation process, which is easily oxidized, resulting in high impurity content, low production efficiency, and poor oxidation resistance of the cored wire.

[0007] On one hand, embodiments of the present invention provide a method for preparing low-impurity, oxidation-resistant rare-earth cored wire, comprising the following steps: S1. Preparation of rare earth metal core materials; S2, preparation of rare earth silicon-iron alloy powder; S3. Body encapsulation treatment; S4. Outer layer coating treatment; S5. Finished product inspection and packaging.

[0008] Furthermore, step S1 specifically includes the following steps: S11. Rare earth metals were prepared using liquid cathode electrolysis technology in the REF3-LiF molten salt system. S12. Solidify the prepared rare earth metal to form a rod-shaped rare earth metal ingot. S13. Rare earth metal ingots are prepared into rare earth metal cores under the protection of a protective gas.

[0009] Furthermore, step S2 specifically includes the following steps: S21. Preparation of rare earth ferrosilicon alloy rods; The ferrosilicon alloy is first melted in a vacuum melting furnace, and then some of the rare earth metal ingots prepared in step S12 are also added to the vacuum melting furnace to form a rare earth ferrosilicon alloy melt. After the rare earth ferrosilicon alloy melt solidifies, it is prepared into rare earth ferrosilicon alloy bars. S22. Preparation of rare earth ferrosilicon alloy powder; Remove the surface oxide layer of the rare earth ferrosilicon alloy rod and prepare the rare earth ferrosilicon alloy rod into rare earth ferrosilicon alloy powder.

[0010] Further, step S3 specifically includes: spraying the rare earth silicon-iron alloy powder prepared in step S2 onto the surface of the rare earth metal core material prepared in step S1 under the protection of a protective gas, thereby forming a rare earth silicon-iron alloy powder coating layer on the surface of the rare earth metal core material.

[0011] Furthermore, step S21 specifically includes the following steps: S211, Charging raw materials for smelting: Place rare earth metal ingots into the storage assembly and ferrosilicon alloy into the storage chamber in the intermediate cavity; S212, silicon-iron alloy blanking; S213. Rare earth metal ingots are fed into the intermediate cavity; S214. Rare earth metal ingots are fed into the vacuum melting furnace; S215. Preparation of rare earth ferrosilicon alloy bars: The rare earth metal ingot and the ferrosilicon alloy are melted and mixed evenly, and then kept at a constant temperature for 10 min-20 min to form the rare earth ferrosilicon alloy melt. After the rare earth ferrosilicon alloy melt solidifies, it is prepared into rare earth ferrosilicon alloy bars.

[0012] Further, step S212 specifically includes: starting the first motor to drive the outer feeding cylinder to rotate, the feeding pusher plate inside the outer feeding cylinder pushes the ferrosilicon alloy to move, when the ferrosilicon alloy moves to the second feeding port position, it falls from the second feeding port into the vacuum melting furnace, until all the ferrosilicon alloy in the intermediate cavity has fallen into the vacuum melting furnace, and the first motor stops working.

[0013] Further, step S214 specifically includes: after the ferrosilicon alloy smelting has been completed for a specified time, the first motor is started to drive the outer feeding cylinder to rotate, and the feeding pusher plate pushes the rare earth metal ingots to move until all the rare earth metal ingots in the intermediate cavity fall from the second feeding port into the vacuum melting furnace, and the first motor stops working.

[0014] Further, step S211 specifically includes: S2111, The lifting mechanism drives the lifting sealing cover to rise, opening the top opening of the sealing box, and placing the rod-shaped ferrosilicon alloy from the second feeding groove into the storage chamber in the middle cavity, and placing the rod-shaped rare earth metal ingot from the first feeding groove into the storage assembly.

[0015] Furthermore, step S211 also includes: S2112: After the rare earth metal ingots and ferrosilicon alloys have been transported, the lifting mechanism drives the lifting sealing cover to descend to abut against the top opening of the sealing box, so that the vacuum sealing box remains sealed. S2113: Evacuate the vacuum chamber to maintain a vacuum environment inside the vacuum chamber.

[0016] Further, step S21 is carried out using a low-impurity, antioxidant rare-earth cored wire preparation apparatus.

[0017] Further, step S4 specifically includes: S41. Select a low-carbon steel strip, perform rust removal and degreasing treatment on the low-carbon steel strip, then anneal it at 800℃-900℃ for 2-3 hours, and cool it to room temperature; S42. The processed low-carbon steel strip is wrapped around the rare-earth silicon-iron alloy powder coating layer on the surface of the rare-earth metal core material using a wire wrapping machine to obtain a low-impurity, oxidation-resistant rare-earth cored wire.

[0018] On the other hand, embodiments of the present invention provide a cored wire, which is prepared by the above-mentioned low-impurity antioxidant rare earth cored wire preparation method. The cored wire comprises, from the inside out, a rare earth metal core, a rare earth silicon-iron alloy powder coating layer, and a low-carbon steel strip.

[0019] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: 1. The method for preparing low-impurity, antioxidant rare earth cored wire provided by the present invention involves body coating and outer layer coating treatment on the outside of the rare earth metal core material to form a double-layer coating structure, which protects the rare earth metal and improves the antioxidant performance of the cored wire.

[0020] 2. The method for preparing low-impurity, oxidation-resistant rare-earth cored wire provided by the present invention involves spraying rare-earth ferrosilicon alloy powder onto the surface of a rare-earth metal core material under the protection of a protective gas, thereby forming a rare-earth ferrosilicon alloy powder coating layer on the surface of the rare-earth metal core material. Utilizing the characteristic that silicon and rare-earth elements form stable intermetallic compounds, the rare-earth ferrosilicon alloy powder coating layer is used as an intermediate coating layer to provide oxidation protection for the rare-earth metal core material, thereby improving the oxidation resistance of the cored wire.

[0021] 3. The method for preparing low-impurity, oxidation-resistant rare earth cored wire provided by the present invention involves successively feeding ferrosilicon alloy and rare earth metal ingots into a vacuum melting furnace for melting to prepare rare earth ferrosilicon alloy rods. This method prevents the rare earth metals from being oxidized during the smelting process, improves the purity of the rare earth ferrosilicon alloy rods, reduces the impurity content in the raw materials for cored wire preparation, and improves the quality of the finished cored wire.

[0022] 4. The method for preparing low-impurity, oxidation-resistant rare-earth cored wire provided by this invention involves placing a rare-earth metal ingot in a storage assembly and placing a ferrosilicon alloy in a storage chamber within an intermediate cavity. At the start of smelting, the ferrosilicon alloy is first added from the intermediate cavity to a vacuum melting furnace for smelting, and then the rare-earth metal ingot from the storage assembly is added to the intermediate cavity. After a specified smelting time, the rare-earth metal ingot is then added from the storage chamber to the vacuum melting furnace. The loading and unloading mechanism feeds the ferrosilicon alloy and rare-earth metal ingot from the storage chamber into the vacuum melting furnace in stages. Because the loading and unloading mechanism is located within a vacuum-sealed box, the vacuum level within the vacuum-sealed box is maintained throughout the smelting process, preventing oxygen-containing gases from entering the vacuum melting furnace and contacting the molten rare-earth metal. This allows the vacuum melting furnace to complete the smelting of the rare-earth metal ingot and ferrosilicon alloy in an environment with sufficient vacuum, preventing oxidation impurities in the molten rare-earth metal and improving the quality of the smelted rare-earth alloy ingot.

[0023] 5. The method for preparing low-impurity, antioxidant rare-earth cored wire provided by the present invention involves filling the cored wire with protective gas during the cored wire coating process and using vacuum packaging or protective gas-filled packaging for the finished product. This achieves full-process protection during the cored wire preparation, coating process and finished product packaging, thereby improving the quality and antioxidant performance of the cored wire.

[0024] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0025] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. Figure 1 This is a flowchart of the method for preparing low-impurity, antioxidant rare-earth cored wire in Embodiment 1 of the present invention; Figure 2 This is a flowchart illustrating the preparation of rare earth ferrosilicon alloy rods in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the apparatus for preparing low-impurity, antioxidant rare-earth cored wires in Embodiment 2 of the present invention; Figure 4 This is a cross-sectional view of the apparatus for preparing low-impurity, antioxidant rare-earth cored wires in Embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the loading and unloading mechanism in Embodiment 2 of the present invention; Figure 6 This is a cross-sectional view of the loading and unloading mechanism in Embodiment 2 of the present invention; Figure 7 This is a cross-sectional view of the inner storage cylinder in Embodiment 2 of the present invention; Figure 8 This is a schematic diagram of the positioning frame in Embodiment 2 of the present invention; Figure 9 This is a schematic diagram of the speed limiting mechanism in Embodiment 2 of the present invention; Figure 10 This is a schematic diagram of the cored wire structure in this invention.

[0026] Figure label: 1-Vacuum sealed box; 11-Lifting sealing cover; 12-Sealed box body; 13-Lifting mechanism; 131-Connecting plate; 132-First hydraulic cylinder; 2- Loading and unloading mechanism; 21- Inner storage cylinder; 211- First loading trough; 212- First unloading port; 213- Motor mounting housing; 214- Top circular plate; 215- Drive protrusion; 22-Outer feeding cylinder; 221-Second feeding trough; 222-Internal gear ring; 223-First motor; 224-Drive gear; 225-Feeding push plate; 226-Limiting port; 23-Storage assembly; 24-Feeding turntable; 241-Second feeding port; 25-Pushing assembly; 251-Lifting connecting seat; 252-Positioning ring; 253-Positioning frame; 254-Elastic connecting frame; 2541-Connecting rod; 2542-Connecting seat; 2543-Rotating shaft; 2544-Protective housing; 2545-Reset component; 26-Second hydraulic cylinder; 27-Second motor; 28-Speed ​​limiting mechanism; 281-Mounting base; 282-Speed ​​limiting wheel; 283-Connecting slide; 284-Drive rod; 2821-Damping boss; 285-Sliding support; 286-Third motor; 3-Vacuum melting furnace; 4-Bar forming mechanism; 41-Solution filling port. Detailed Implementation

[0027] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0028] Example 1 To address one of the problems in the cored wire manufacturing process—namely, the high impurity content, low production efficiency, and poor oxidation resistance of rare earth metals due to easy oxidation—a specific embodiment of this invention discloses a method for preparing low-impurity, oxidation-resistant rare earth cored wires. Figure 1 As shown, it includes the following steps: S1, preparation of rare earth metal core material 100; S11. Low-impurity rare earth metals are prepared in a bottom cathode electrolytic cell using liquid cathode electrolysis technology in a REF3-LiF molten salt system. Specifically, rare earth oxides are added to the bottom cathode electrolytic cell, graphite is used as the anode, and rare earth metals are used as the liquid cathode to prepare low-impurity rare earth metals.

[0029] In the REF3-LiF molten salt system, the mass percentage of REF3 (rare earth fluoride) is 75%-80%, and the mass percentage of LiF (lithium fluoride) is 20%-25%. During the rare earth electrolysis process, liquid cathode electrolysis technology is used, with rare earth oxides added to the REF3-LiF molten salt system. The electrolysis temperature is 1000℃±50℃, the cathode current density is 0.5A / cm²-2.0A / cm², and the anode current density is 1A / cm²-3A / cm².

[0030] Liquid cathode electrolysis technology can effectively reduce the deposition potential of metal products, suppress the deposition of impurity metal ions, and obtain high-purity rare earth metals. In this embodiment, the purity of the rare earth metal prepared is ≥99.9%. Specifically, in the prepared rare earth metal, the TRE (Total Rare Earth) is ≥99.9%, C < 0.010%, Fe < 0.08%, and O < 0.0050%. Furthermore, liquid cathode electrolysis technology utilizes the density difference between the molten rare earth metal products and the electrolyte to allow the liquid rare earth metal and electrolyte to naturally separate into layers, simplifying the collection process of rare earth metal products and improving production efficiency.

[0031] S12. Solidify the prepared rare earth metal to form a rod-shaped rare earth metal ingot. S13. Rare earth metal ingots are prepared into rare earth metal core material 100 using a wire pressing machine under the protection of protective gas.

[0032] It should be noted that the wire pressing machine is a mature product in the existing technology, and its specific structure will not be described in detail here.

[0033] S2. Preparation of coating layer powder; specifically including the following steps: S21. Preparation of rare earth ferrosilicon alloy rods; The ferrosilicon alloy is first melted in a vacuum melting furnace 3. Then, some of the rare earth metal ingots prepared in step S1 are also added to the vacuum melting furnace 3. After mixing evenly, the mixture is kept at a constant temperature for 10-20 minutes to form a rare earth ferrosilicon alloy melt. After the melt solidifies, it is prepared into rare earth ferrosilicon alloy bars.

[0034] S22. Preparation of rare earth silicon-iron alloy powder.

[0035] The surface oxide layer of rare earth ferrosilicon alloy rods is removed, and rare earth ferrosilicon alloy powder is prepared from the rare earth ferrosilicon alloy rods by plasma rotating electrode atomization method.

[0036] Specifically, after removing the surface oxide layer of the rare earth ferrosilicon alloy rod, the rare earth ferrosilicon alloy rod is loaded into the rotary feed device in the atomization chamber as a consumable electrode rod; after sealing, the atomization chamber is evacuated, and when the vacuum degree is less than 5×10 -3After Pa, a protective gas with a purity of 99.99% is introduced and the circulation pump is started to ensure uniform distribution of the protective gas in the atomization chamber, preventing oxidation of the rare earth ferrosilicon alloy during preparation. Subsequently, the cooling system is started to supply cooling gas into the atomization chamber. The rotary feed device is then started to accelerate the rotation of the rare earth ferrosilicon alloy rod, with the speed set at 18,000 r / min. Once the preset speed is reached, the plasma gun is started with a current intensity of 1700 A. A high-temperature plasma arc is generated between the rare earth ferrosilicon alloy rod and the plasma gun, and the end face of the rare earth ferrosilicon alloy rod melts instantly to form a liquid metal film. At the ultra-high speed of 18,000 r / min, the centrifugal force on the liquid metal film causes it to break free of surface tension, detach from the rare earth ferrosilicon alloy rod, and form a large number of tiny liquid metal droplets. The liquid metal droplets solidify into spherical or near-spherical rare earth ferrosilicon alloy powder under the cooling effect of the cooling gas. Subsequently, the rotary feed device continuously feeds the rare earth ferrosilicon alloy rod at a feed rate of 0.8 mm / s, and finally prepares rare earth ferrosilicon alloy powder with a particle size of 50-150µm from the rare earth ferrosilicon alloy rod.

[0037] S3. Body encapsulation treatment; The rare earth silicon-iron alloy powder prepared in step S2 is sprayed onto the surface of the rare earth metal core material 100 prepared in step S1 under the protection of a protective gas, forming a rare earth silicon-iron alloy powder coating layer 200 on the surface of the rare earth metal core material 100.

[0038] S4. Outer layer coating treatment; S41. Select low carbon steel strip 300, perform rust removal and degreasing treatment on the low carbon steel strip 300, then anneal at 800℃-900℃ for 2-3 hours, and cool to room temperature; S42. The treated low-carbon steel strip 300 is wrapped onto the rare earth silicon-iron alloy powder coating layer 200 on the surface of the rare earth metal core material 100 by a wire wrapping machine to obtain a low-impurity, oxidation-resistant rare earth cored wire.

[0039] When using a wire wrapping machine to wrap low carbon steel strip 300, the pressure of the wire wrapping machine is 0.2MPa-0.4MPa, and the speed is 8m / min-15m / min.

[0040] It should be noted that the wire wrapping machine is a mature product in the existing technology, and its specific structure will not be described in detail here.

[0041] S5. Finished product inspection and packaging.

[0042] The appearance, size, impurity content, and oxidation resistance of the prepared rare earth cored wires are tested. After passing the tests, the wires are vacuum-packed or packaged with protective gas to prevent oxidation during storage and transportation.

[0043] It should be noted that the protective gas in this embodiment is argon or nitrogen.

[0044] Furthermore, the rare earth elements in the rare earth metal core material 100 and the rare earth silicon-iron alloy powder are consistent, and the rare earth elements are one or more of lanthanum, cerium, praseodymium, neodymium and yttrium.

[0045] To solve the problem of low feeding control accuracy, such as Figure 2 As shown, step S21 specifically includes the following steps: S211, Smelting raw material feeding: Rare earth metal ingots are placed from the first feeding tank 211 into the storage assembly 23, and ferrosilicon alloy is placed from the second feeding tank 221 into the storage chamber in the intermediate cavity. S212, Ferrosilicon alloy feeding: Start the first motor 223 to drive the outer feeding cylinder 22 to rotate. The feeding pusher 225 inside the outer feeding cylinder 22 pushes the ferrosilicon alloy to move. When the ferrosilicon alloy moves to the position of the second feeding port 241, it falls from the second feeding port 241 into the vacuum melting furnace 3 until all the ferrosilicon alloy in the intermediate cavity has fallen into the vacuum melting furnace 3, and the first motor 223 stops working. S213. Rare earth metal ingots are fed into the intermediate cavity: Multiple rare earth metal ingots are pushed out from multiple inner storage cylinders 21 at the same time, and the rare earth metal ingots fall from the first feeding port 212 into the corresponding storage cavity. S214. Rare earth metal ingots are fed into the vacuum melting furnace 3: After the ferrosilicon alloy smelting time is specified, the first motor 223 is started, which drives the outer feeding cylinder 22 to rotate. The feeding pusher 225 pushes the rare earth metal ingots to move until all the rare earth metal ingots in the intermediate cavity fall from the second feeding port 241 into the vacuum melting furnace 3, and the first motor 223 stops working. S215. Preparation of rare earth ferrosilicon alloy bars: After melting and mixing rare earth metal ingots and ferrosilicon alloy evenly, the mixture is kept at a constant temperature for 10-20 minutes to form a rare earth ferrosilicon alloy melt. After the melt solidifies, it is prepared into rare earth ferrosilicon alloy bars.

[0046] In this embodiment, both rare earth metal ingots and ferrosilicon alloys are fed into the intermediate cavity by the push of the feeding plate 225. The feeding, storage and feeding of rare earth metal ingots and ferrosilicon alloys are realized simultaneously by a feeding mechanism 2. Both rare earth metal ingots and ferrosilicon alloys are put into the vacuum melting furnace 3 from the second feeding port 241, which makes it easy to realize the sealed storage and time-sharing feeding of rare earth metal ingots and ferrosilicon alloys. The structure of the feeding mechanism 2 is simple and easy to control, which improves the utilization efficiency of the feeding mechanism 2 and the control accuracy of feeding.

[0047] To address the issue of high impurity content in rare earth ferrosilicon alloy bars due to the easy oxidation of rare earth metals, the loading and unloading mechanism 2 and the vacuum melting furnace 3 are installed inside the vacuum sealed box 1. Step S211 specifically includes: S2111: The lifting mechanism 13 drives the lifting sealing cover 11 to rise, opening the top opening of the sealing box 12, and using the hoisting equipment to put the rod-shaped ferrosilicon alloy from the second feeding trough 221 into the storage chamber in the intermediate cavity, and using the hoisting equipment to put the rod-shaped rare earth metal ingot from the first feeding trough 211 into the storage assembly 23. S2112: After the rare earth metal ingots and ferrosilicon alloys have been transported, the lifting mechanism 13 drives the lifting sealing cover 11 to descend to abut against the top opening of the sealing box 12, so that the vacuum sealing box 1 remains sealed. S2113: Vacuum the vacuum sealed box 1 to maintain a vacuum environment inside the vacuum sealed box 1, preventing oxygen-containing gas from entering the vacuum melting furnace 3 and coming into contact with the rare earth metal molten liquid during the smelting process; the vacuum melting furnace 3 completes the smelting of rare earth metal ingots and ferrosilicon alloys in a vacuum environment, preventing the appearance of oxidation impurities in the rare earth metal molten liquid and improving the quality of the smelted rare earth alloy ingots.

[0048] To solve the problem that rare earth metal ingots cannot be fed at the same time, step S213 specifically includes: the pushing component 25 pushes out the rare earth metal ingots in multiple storage components 23 at the same time, and the multiple rare earth metal ingots fall from the first discharge port 212 into the corresponding storage chamber at the same time.

[0049] Specifically, the second hydraulic cylinder 26 drives the lifting connecting seat 251 to move the positioning ring 252, positioning frame 253 and rare earth metal ingot upwards until the inwardly tilted rare earth metal ingot contacts the driving protrusion 215 on the lower surface of the top circular plate 214. The rare earth metal ingot will not continue to rise under the action of the driving protrusion 215. The second hydraulic cylinder 26 continues to drive the lifting connecting seat 251, and the driving protrusion 215 squeezes the rare earth metal ingot downwards, causing the L-shaped positioning frame 253 to be passively flipped. The upright plate of the positioning frame 253 pushes the rare earth metal ingot, pushing the rare earth metal ingot out of the storage component 23. The rare earth metal ingot falls from the first discharge port 212 into the storage cavity in the middle cavity. At the same time, multiple positioning frames 253 act simultaneously, pushing out multiple rare earth metal ingots from multiple storage components 23 at the same time. Multiple rare earth metal ingots fall from the first discharge port 212 into the corresponding storage cavity at the same time. After the rare earth metal ingot is pushed out of the inner storage cylinder 21, the second hydraulic cylinder 26 stops operating, and the reset component 2545 drives the positioning frame 253 to reset to the initial state.

[0050] To address the issue of material accumulation in the vacuum melting furnace 3, steps S212 and S214 further include adjusting the position of the second discharge port 241.

[0051] Specifically, the second motor 27 drives the feeding turntable 24 to rotate. When the feeding turntable 24 rotates, it causes the position of the second feeding port 241 to move in the top area of ​​the vacuum melting furnace 3. Adjusting the position of the second feeding port 241 allows rare earth metal ingots or ferrosilicon alloys to fall to different positions in the vacuum melting furnace 3, preventing rare earth metal ingots and ferrosilicon alloys from accumulating in a certain position in the vacuum melting furnace 3, thereby improving the quality and efficiency of ferrosilicon alloy smelting.

[0052] To address the issue of excessively fast material descent, steps S212 and S214 further include controlling the feeding speed of rare earth metal ingots or ferrosilicon alloys via a speed limiting mechanism 28.

[0053] Specifically, when the feeding pusher 225 drives the rare earth metal ingot or ferrosilicon alloy to the second feeding port 241, the drive rod 284 drives the mounting base 281 and the speed limiting wheel 282 into the limiting port 226, so that the speed limiting wheel 282 contacts the rare earth metal ingot or ferrosilicon alloy, and abuts the rare earth metal ingot or ferrosilicon alloy against the inner wall of the second feeding port 241. The third motor 286 drives the speed limiting wheel 282 to rotate, and the speed limiting wheel 282 drives the rare earth metal ingot or ferrosilicon alloy to move slowly downward and enter the vacuum melting furnace 3 at a low speed.

[0054] When the feeding turntable 24 drives the second feeding port 241 to rotate, the speed limiting mechanism 28 rotates synchronously with the second feeding port 241. When the second feeding port 241 rotates to the position corresponding to the limit port 226, the feeding turntable 24 stops rotating, and the feeding push plate 225 pushes the rare earth metal ingot or ferrosilicon alloy to be fed. The speed limiting mechanism 28 passes through the limit port 226 to assist in the feeding. After feeding, the speed limiting mechanism 28 exits the limit port 226. Then, the feeding turntable 24 drives the second feeding port 241 to rotate to the position corresponding to the next limit port 226, and the feeding push plate 225 pushes the rare earth metal ingot or ferrosilicon alloy to be fed again. The speed limiting mechanism 28 assists in the feeding. This process is repeated until all the rare earth metal ingots or ferrosilicon alloys have been fed.

[0055] Step S215 specifically includes: melting and mixing rare earth metal ingots and ferrosilicon alloys in a vacuum melting furnace 3, and then holding the mixture at a constant temperature for 10-20 minutes to form a rare earth ferrosilicon alloy melt; the turning mechanism drives the vacuum melting furnace 3 to turn, and injects the rare earth ferrosilicon alloy melt from the solution filling port 41 into the bar forming mechanism 4, and the rare earth ferrosilicon alloy melt is formed into rare earth alloy bars in the bar forming mechanism 4.

[0056] The solution filling port 41 of the bar forming mechanism 4 extends into the vacuum sealed box 1 and is sealed to the vacuum sealed box 1. The rare earth silicon iron alloy melt is formed into bars in a vacuum environment to prevent the rare earth silicon iron alloy melt from being oxidized during transportation or forming process, thereby improving the purity of the rare earth alloy bars.

[0057] The method for preparing low-impurity, oxidation-resistant rare-earth cored wire in this embodiment utilizes liquid cathode electrolysis technology to obtain high-purity rare-earth metals and simplifies the collection process of rare-earth metal products, thereby improving production efficiency. Ferrosilicon alloy and rare-earth metal ingots are successively fed into a vacuum melting furnace 3 in a vacuum environment for melting, preparing rare-earth ferrosilicon alloy rods. This prevents the rare-earth metals from being oxidized during the smelting process and improves the purity of the rare-earth ferrosilicon alloy rods. Then, a plasma rotating electrode atomization method is used to prepare rare-earth ferrosilicon alloy powder from the rare-earth ferrosilicon alloy rods, resulting in high production efficiency and good sphericity of the prepared rare-earth ferrosilicon alloy powder. Under protective gas, the rare-earth ferrosilicon alloy powder is sprayed onto the surface of the rare-earth metal core material 100, forming a rare-earth ferrosilicon alloy powder coating layer 200 on the surface of the rare-earth metal core material 100, protecting the rare-earth metals and improving the oxidation resistance of the rare-earth cored wire. The treated low-carbon steel strip 300 is coated onto a rare-earth ferrosilicon alloy powder coating layer 200 on the surface of the rare-earth metal core material 100 using a wire wrapping machine, resulting in a low-impurity, oxidation-resistant rare-earth cored wire. Qualified rare-earth cored wires are vacuum-packed or packaged with protective gas to prevent oxidation during storage and transportation. The process prevents oxidation of the rare-earth metal core material 100 and the rare-earth ferrosilicon alloy rod, improving the purity and quality of the raw materials. Protective gas is used during the cored wire coating process, and the finished product is vacuum-packed or packaged with protective gas. This achieves full-process protection throughout the cored wire manufacturing process, from raw material preparation and coating to finished product packaging, improving the quality and oxidation resistance of the cored wire.

[0058] Example 2 To address the issues of easy oxidation and low production efficiency during the preparation of rare earth cored wires, another specific embodiment of the present invention discloses a low-impurity, oxidation-resistant rare earth cored wire preparation apparatus, used to implement the low-impurity, oxidation-resistant rare earth cored wire preparation method in Embodiment 1. Specifically, in this embodiment, the low-impurity, oxidation-resistant rare earth cored wire preparation apparatus implements step S21 of Embodiment 1, preparing rare earth ferrosilicon alloy rods.

[0059] like Figure 3 and Figure 4 As shown, the low-impurity antioxidant rare earth cored wire preparation device includes a vacuum sealed box 1, a loading and unloading mechanism 2, and a vacuum melting furnace 3. The loading and unloading mechanism 2 and the vacuum melting furnace 3 are arranged inside the vacuum sealed box 1.

[0060] The loading and unloading mechanism 2 includes an inner storage cylinder 21 and an outer unloading cylinder 22. The outer unloading cylinder 22 is coaxially disposed outside the inner storage cylinder 21, and an intermediate cavity is formed between the inner storage cylinder 21 and the outer unloading cylinder 22. Multiple storage components 23 are fixedly disposed inside the inner storage cylinder 21. Multiple first loading grooves 211 are provided on the inner storage cylinder 21, from which rare earth metal ingots are added to the storage components 23. Multiple second loading grooves 221 are provided on the outer unloading cylinder 22, from which ferrosilicon alloy is added to the intermediate cavity.

[0061] Multiple first discharge ports 212 are provided on the side wall of the inner storage cylinder 21. Each of the multiple first discharge ports 212 corresponds to a multiple storage components 23. All of the multiple first discharge ports 212 are connected to the intermediate cavity. The rare earth metal ingots in the storage components 23 can fall into the intermediate cavity from the first discharge ports 212. In use, the loading and unloading mechanism 2 first puts the ferrosilicon alloy in the intermediate cavity into the vacuum melting furnace 3, and then pushes the rare earth metal ingots in the storage components 23 from the first discharge ports 212 into the intermediate cavity. After waiting for the ferrosilicon alloy to be smelted for a specified time, the rare earth metal ingots in the intermediate cavity are put into the vacuum melting furnace 3.

[0062] Furthermore, to solve the problem of complex feeding operations, such as Figure 5 and Figure 6 As shown, the outer feeding cylinder 22 is rotatably sleeved on the outside of the inner storage cylinder 21. An internal gear ring 222 is provided on the top of the outer feeding cylinder 22, and a first motor 223 is provided on the top of the inner storage cylinder 21. The output end of the first motor 223 is connected to a drive gear 224, which meshes with the internal gear ring 222. The first motor 223 drives the drive gear 224 to rotate, which in turn drives the internal gear ring 222 to rotate, thereby driving the outer feeding cylinder 22 to rotate. Multiple second feeding grooves 221 are provided on the top of the outer feeding cylinder 22 along the circumferential direction. Multiple feeding push plates 225 are fixedly connected to the inner wall of the outer feeding cylinder 22. A storage cavity is formed between two adjacent feeding push plates 225. Each storage cavity corresponds to the position of a second feeding groove 221. Ferrosilicon alloy is added from the second feeding groove 221 into the storage cavity between two adjacent feeding push plates 225.

[0063] When rare earth metal ingots are added to the storage assembly 23 from the first feeding trough 211, the ingots fall from the first discharge port 212 into the corresponding storage chamber. A discharge turntable 24 is connected to the bottom of the outer discharge cylinder 22, and a second discharge port 241 is provided on the turntable 24. When the outer discharge cylinder 22 rotates, the discharge pusher plate 225 pushes the ferrosilicon alloy or rare earth metal ingots out of the second discharge port 241 and into the vacuum melting furnace 3 for smelting. Both rare earth metal ingots and ferrosilicon alloys are discharged in the intermediate cavity by the pusher plate 225. The structure of the loading and unloading mechanism 2 is simple and easy to control, improving the utilization efficiency and feeding control accuracy of the loading and unloading mechanism 2.

[0064] Furthermore, to address the issue of material accumulation caused by a fixed feeding position, the feeding turntable 24 is rotatably connected to the bottom of the outer feeding cylinder 22, and a motor mounting housing 213 is provided at the bottom of the inner storage cylinder 21. A second motor 27 is installed inside the motor mounting housing 213, and the output end of the second motor 27 is connected to the feeding turntable 24. The second motor 27 is used to drive the feeding turntable 24 to rotate. When the feeding turntable 24 rotates, it causes the position of the second feeding port 241 to move in the top area of ​​the vacuum melting furnace 3, so as to evenly add rare earth metal ingots and ferrosilicon alloy into the vacuum melting furnace 3, preventing rare earth metal ingots and ferrosilicon alloy from accumulating in a certain position in the vacuum melting furnace 3, and improving the quality and efficiency of ferrosilicon alloy smelting.

[0065] Furthermore, to solve the problem of inconvenient material loading, the vacuum sealed box 1 includes a lifting sealing cover 11 and a sealing box body 12. The top of the sealing box body 12 is provided with a top opening. The lifting sealing cover 11 and the sealing box body 12 are connected in a lifting manner. The lifting sealing cover 11 is used to open and seal the top opening. The loading and unloading mechanism 2 is connected to the side of the lifting sealing cover 11 located inside the vacuum sealed box 1.

[0066] Furthermore, a lifting mechanism 13 is provided inside the vacuum sealing box 1 to drive the lifting sealing cover 11 to rise and fall. The lifting mechanism 13 includes a connecting plate 131 and a first hydraulic cylinder 132. The connecting plate 131 is fixedly installed on the inner side wall of the vacuum sealing box 1, and the fixed end of the first hydraulic cylinder 132 is fixedly installed on the connecting plate 131. The driving end of the first hydraulic cylinder 132 is connected to the bottom of the lifting sealing cover 11 and is used to drive the lifting sealing cover 11 to rise and fall.

[0067] Furthermore, the vacuum chamber 1 is connected to an external vacuum pumping device, which is used to evacuate the vacuum chamber 1.

[0068] Furthermore, the first feeding trough 211 is an arc-shaped trough, and multiple first feeding troughs 211 are arranged on the top of the inner storage cylinder 21 and distributed along the circumferential direction. Each first feeding trough 211 corresponds to the position of multiple storage components 23.

[0069] Furthermore, to address the problem of low positioning accuracy in rare earth metal ingots, such as... Figure 7 As shown, a pushing assembly 25 is provided inside the inner storage cylinder 21. The pushing assembly 25 includes a lifting connecting seat 251, a positioning ring 252, a positioning frame 253, and an elastic connecting frame 254. The lifting connecting seat 251 is slidably disposed inside the inner storage cylinder 21. The positioning ring 252 is fixedly connected to the top of the lifting connecting seat 251. The positioning frame 253 is connected to the lifting connecting seat 251 through the elastic connecting frame 254. The positioning frame 253 extends into the storage assembly 23, and multiple positioning frames 253 correspond one-to-one with multiple storage assemblies 23. The positioning ring 252 is disposed on the outside of the storage assembly 23 and is used to abut against the upper side wall of the rare earth metal ingot.

[0070] The storage assembly 23 includes a base plate and side plates disposed on both sides of the base plate. The side plates are arc-shaped plates and are used to contact and limit the rare earth metal ingot with the outer circumferential surface. The distance between the inner sides of the two side plates is smaller than the diameter of the rare earth metal ingot to prevent the rare earth metal ingot from falling from the inside. The distance between the outer sides of the two side plates is larger than the diameter of the rare earth metal ingot, so that the rare earth metal ingot can be discharged from the storage assembly 23.

[0071] The positioning frame 253 has an L-shaped structure and includes a base plate and a vertical plate arranged perpendicularly to each other. When the rare earth metal ingot is added to the storage assembly 23, the bottom and lower sidewall of the rare earth metal ingot contact the base plate and vertical plate of the positioning frame 253, respectively, and the positioning frame 253 supports the rare earth metal ingot. The two side plates of the storage assembly 23 contact and limit the rare earth metal ingot with the outer circumferential surface, positioning the rare earth metal ingot in the storage assembly 23 and improving the positioning accuracy of the rare earth metal ingot. When feeding the rare earth metal ingot, the positioning frame 253 rotates, and the vertical plate of the positioning frame 253 pushes the rare earth metal ingot, releasing the rare earth metal ingot from the storage assembly 23, realizing the feeding of the rare earth metal ingot from the inner storage cylinder 21.

[0072] Furthermore, the inner side of the positioning ring 252 includes an inclined guide surface, which provides guidance for the rare earth metal ingot when it is placed into the storage assembly 23.

[0073] Furthermore, a second hydraulic cylinder 26 is provided at the bottom of the inner storage cylinder 21. The drive end of the second hydraulic cylinder 26 is connected to the lifting connecting seat 251, and the second hydraulic cylinder 26 is used to drive the lifting connecting seat 251 to rise and fall. When rare earth metal ingots need to be added to the storage assembly 23, the second hydraulic cylinder 26 drives the lifting connecting seat 251, the positioning ring 252, and the positioning frame 253 to rise. The positioning ring 252 and the positioning frame 253 jointly support the rare earth metal ingot. Then the second hydraulic cylinder 26 descends, positioning the rare earth metal ingot in the storage assembly 23.

[0074] Furthermore, to address the issue of simultaneous feeding of rare earth metal ingots, such as... Figure 7 As shown, the storage component 23 is inclined inward. During the process of the second hydraulic cylinder 26 driving the lifting connecting seat 251 to lower the rare earth metal ingot, the storage component 23, which is inclined inward, causes the rare earth metal ingot to tilt inward.

[0075] The inner storage cylinder 21 includes a top circular plate 214, and a plurality of first feeding grooves 211 are disposed on the top circular plate 214. A circular receiving groove is provided on the lower surface of the top circular plate 214. The receiving groove is coaxially disposed with the top circular plate 214, and a driving protrusion 215 is formed between the receiving groove and the first feeding grooves 211.

[0076] When the rare earth metal ingot is removed from the storage assembly 23, the second hydraulic cylinder 26 drives the lifting connecting seat 251 to move the positioning ring 252, positioning frame 253 and rare earth metal ingot upward until the inwardly tilted rare earth metal ingot contacts the driving protrusion 215 on the lower surface of the top circular plate 214. The rare earth metal ingot will not continue to rise under the action of the driving protrusion 215. The second hydraulic cylinder 26 continues to drive the lifting connecting seat 251, and the driving protrusion 215 presses the rare earth metal ingot downward, causing the L-shaped positioning frame 253 to be passively flipped. The upright plate of the positioning frame 253 pushes the rare earth metal ingot, pushing it out of the storage assembly 23. The rare earth metal ingot falls from the first discharge port 212 into the storage cavity in the middle cavity. At the same time, multiple positioning frames 253 flip, pushing out multiple rare earth metal ingots from multiple storage assemblies 23 at the same time. Multiple rare earth metal ingots fall from the first discharge port 212 into the corresponding storage cavities at the same time.

[0077] Furthermore, such as Figure 7 and Figure 8 As shown, the elastic connecting frame 254 includes a connecting rod 2541, a connecting seat 2542, a rotating shaft 2543, a protective shell 2544, and a reset member 2545. One end of the connecting rod 2541 is fixedly connected to the lifting connecting seat 251, and the other end is connected to the connecting seat 2542. The positioning frame 253 is rotatably connected to the connecting seat 2542 via the rotating shaft 2543. The protective shell 2544 is coaxially disposed on the outside of the rotating shaft 2543 and fixedly connected to the connecting seat 2542. One end of the reset member 2545 is connected to the rotating shaft 2543, and the other end is connected to the inner wall of the protective shell 2544. In the initial state, the reset member 2545 keeps the bottom plate of the positioning frame 253 in a horizontal state. After the positioning frame 253 completes the rotation and unloading, the reset member 2545 drives the positioning frame 253 to reset to the initial state.

[0078] Furthermore, the reset element 2545 is a spring-loaded spring or a coil spring.

[0079] Furthermore, to address the issue of excessively rapid material falling, such as... Figure 5 and Figure 7 As shown, multiple limiting ports 226 are provided on the lower side of the outer feeding cylinder 22 along the circumferential direction. The limiting ports 226 are located between two adjacent feeding push plates 225. A speed limiting mechanism 28 is fixedly connected to the feeding turntable 24. The setting position of the speed limiting mechanism 28 corresponds to the position of the second feeding port 241. When the position of the second feeding port 241 is adjusted, the speed limiting mechanism 28 moves together with the second feeding port 241. The speed limiting mechanism 28 can extend into the intermediate cavity from the limiting port 226 and contact the rare earth metal ingot or ferrosilicon alloy entering the second feeding port 241, so that the rare earth metal ingot or ferrosilicon alloy is tightly attached to the inner wall of the second feeding port 241. The speed limiting mechanism 28 pushes the rare earth metal ingot or ferrosilicon alloy to fall slowly from the second feeding port 241, preventing the rare earth metal ingot or ferrosilicon alloy from falling too fast, which may cause damage to the vacuum melting furnace 3 or splashing of high-temperature molten metal.

[0080] Furthermore, such as Figure 7 As shown, the speed limiting mechanism 28 includes a mounting base 281, a speed limiting wheel 282, a connecting slide 283, a drive rod 284, and a sliding frame 285. The connecting slide 283 is fixedly connected to the lower surface of the feeding turntable 24. One end of the sliding frame 285 is slidably connected to the connecting slide 283, and the other end is fixedly connected to the mounting base 281. The speed limiting wheel 282 is rotatably mounted on the mounting base 281. When the speed limiting wheel 282 rotates, it drives the rare earth metal ingot or ferrosilicon alloy to move downward. The output end of the drive rod 284 is connected to the sliding frame 285, driving the sliding frame 285 to move along the connecting slide 283, thereby driving the mounting base 281 and the speed limiting wheel 282 to enter or exit the limit port 226.

[0081] like Figure 9 As shown, the speed limiting mechanism 28 also includes a third motor 286 and a transmission assembly (not shown in the figure). The third motor 286 and the transmission assembly are fixedly mounted on the mounting base 281. The output end of the third motor 286 is connected to the shaft of the speed limiting wheel 282 through the transmission assembly. The third motor 286 is used to drive the speed limiting wheel 282 to rotate.

[0082] Furthermore, a damping material (e.g., rubber) is fitted onto the second discharge port 241. For example... Figure 9 As shown, multiple damping bosses 2821 (e.g., rubber bosses) are uniformly provided on the outer circumference of the speed limiting wheel 282. When the speed limiting wheel 282 contacts the rare earth metal ingot or ferrosilicon alloy, friction is generated between the damping bosses 2821 and the damping material of the second discharge port 241 and the rare earth metal ingot or ferrosilicon alloy, preventing the rare earth metal ingot or ferrosilicon alloy from falling. When the speed limiting wheel 282 rotates, the rare earth metal ingot or ferrosilicon alloy is slowly moved downward through the damping bosses 2821.

[0083] In use, the feeding pusher 225 drives the rare earth metal ingot or ferrosilicon alloy to the second feeding port 241. The drive rod 284 drives the mounting base 281 and the speed limiting wheel 282 into the limiting port 226, so that the speed limiting wheel 282 contacts the rare earth metal ingot or ferrosilicon alloy, and abuts the rare earth metal ingot or ferrosilicon alloy against the inner wall of the second feeding port 241. The third motor 286 drives the speed limiting wheel 282 to rotate, and the speed limiting wheel 282 drives the rare earth metal ingot or ferrosilicon alloy to move slowly downward, entering the vacuum melting furnace 3 at a low speed.

[0084] Furthermore, such as Figure 3 and Figure 4 As shown, it also includes a bar forming mechanism 4. The solution filling port 41 of the bar forming mechanism 4 extends into the vacuum sealed box 1 and is sealed to the vacuum sealed box 1. After the rare earth metal ingot and the ferrosilicon alloy are smelted in the vacuum melting furnace 3, a rare earth ferrosilicon alloy melt is formed. The rare earth ferrosilicon alloy melt enters the bar forming mechanism 4 from the solution filling port 41. The bar forming mechanism 4 is used to form the rare earth ferrosilicon alloy melt formed after smelting into rare earth alloy bars.

[0085] Furthermore, it also includes a flipping mechanism, which drives the vacuum melting furnace 3 to flip so as to inject the rare earth ferrosilicon alloy melt in the vacuum melting furnace 3 into the bar forming mechanism 4.

[0086] The low-impurity, oxidation-resistant rare earth cored wire preparation device provided by this invention forms a two-stage storage system with the storage component 23 in the inner storage cylinder 21 and the intermediate cavity in the outer unloading cylinder 22. Before smelting, ferrosilicon alloy and rare earth metal ingots are placed in the intermediate cavity and the storage component 23 respectively, storing them separately. During the smelting process, the loading and unloading mechanism 2 automatically realizes the time-sharing of ferrosilicon alloy and rare earth metal ingots, eliminating the need to open the vacuum sealed box 1 during the smelting process. During the smelting process, the lifting and sealing cover 11 is always in contact with the top opening 12 to maintain the vacuum degree in the vacuum sealed box 1, preventing oxygen-containing gas from entering the vacuum melting furnace 3 during the smelting process, preventing oxidation impurities from appearing in the rare earth metal melt, and improving the quality of the smelted rare earth alloy ingots. During feeding, the feeding turntable 24 rotates, causing the second feeding port 241 to move to the top area of ​​the vacuum melting furnace 3, evenly adding rare earth metal ingots and ferrosilicon alloy into the vacuum melting furnace 3. This prevents the rare earth metal ingots and ferrosilicon alloy from accumulating in one location within the vacuum melting furnace 3, improving the quality and efficiency of ferrosilicon alloy smelting. The feeding speed of the ferrosilicon alloy and rare earth metal ingots is controlled by the speed limiting mechanism 28, allowing the ferrosilicon alloy and rare earth metal ingots to fall slowly into the vacuum melting furnace 3. This prevents the rare earth metal ingots or ferrosilicon alloy from falling too quickly, which could damage the vacuum melting furnace 3 or cause high-temperature molten metal to splash, thus improving the service life of the equipment and the smelting quality.

[0087] Example 3 To address the issues of high impurity content and poor oxidation resistance in rare earth cored wires, another specific embodiment of the present invention discloses a cored wire prepared using the low-impurity, oxidation-resistant rare earth cored wire preparation method described in Example 1 and the low-impurity, oxidation-resistant rare earth cored wire preparation apparatus described in Example 2. Figure 10 As shown, the cored wire consists of a rare earth metal core 100, a rare earth silicon-iron alloy powder coating layer 200, and a low carbon steel strip 300, from the inside out.

[0088] The rare earth metal core material 100 contains 85%-95% rare earth elements and 3%-12% silicon elements by mass, with a total impurity mass fraction of ≤0.2%, meeting the requirements. Impurities include oxygen, sulfur, phosphorus, and other metallic impurities, with oxygen content ≤0.0050%, sulfur content ≤0.0020%, and phosphorus content ≤0.010%. The diameter of the rare earth metal core material 100 is 1.0mm-8.0mm, and the thickness of the rare earth ferrosilicon alloy powder coating layer 200 is 0.3mm-0.8mm. The rare earth ferrosilicon alloy powder coating layer 200 is tightly bonded to the rare earth metal core material 100 without gaps.

[0089] In this embodiment, the cored wire is stored at 25°C and 60% humidity for 6 months, and the oxidation rate of the rare earth metal core material 100 is ≤0.1%; when kept at 800°C for 2 hours, the oxidation loss of the rare earth metal core material 100 is ≤0.5%.

[0090] The rare earth elements in the cored wire include one or more of lanthanum, cerium, praseodymium, neodymium, and yttrium, and the rare earth elements in the rare earth metal core material 100 and the rare earth silicon-iron alloy powder coating layer 200 are consistent.

[0091] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing low-impurity, antioxidant rare-earth cored wire, characterized in that, Includes the following steps: S1, Preparation of rare earth metal core material (100); S2, preparation of rare earth silicon-iron alloy powder; S3. Body encapsulation treatment; S4. Outer layer coating treatment; S5. Finished product inspection and packaging.

2. The method for preparing rare earth cored wire according to claim 1, characterized in that, Step S1 specifically includes the following steps: S11. Rare earth metals were prepared using liquid cathode electrolysis technology in the REF3-LiF molten salt system. S12. Solidify the prepared rare earth metal to form a rod-shaped rare earth metal ingot. S13. Rare earth metal ingots are prepared into rare earth metal cores (100) under the protection of a protective gas.

3. The method for preparing rare earth cored wire according to claim 2, characterized in that, Step S2 specifically includes the following steps: S21. Preparation of rare earth ferrosilicon alloy rods; The ferrosilicon alloy is first melted in a vacuum melting furnace (3), and then some of the rare earth metal ingots prepared in step S12 are also added to the vacuum melting furnace (3) to form a rare earth ferrosilicon alloy melt. After the rare earth ferrosilicon alloy melt solidifies, it is prepared into rare earth ferrosilicon alloy rods. S22. Preparation of rare earth ferrosilicon alloy powder; Remove the surface oxide layer of the rare earth ferrosilicon alloy rod and prepare the rare earth ferrosilicon alloy rod into rare earth ferrosilicon alloy powder.

4. The method for preparing rare earth cored wire according to claim 1, characterized in that, The specific steps of step S3 include: spraying the rare earth silicon-iron alloy powder prepared in step S2 onto the surface of the rare earth metal core material (100) prepared in step S1 under the protection of a protective gas, and forming a rare earth silicon-iron alloy powder coating layer (200) on the surface of the rare earth metal core material (100).

5. The method for preparing rare earth cored wire according to claim 3, characterized in that, Step S21 specifically includes the following steps: S211, Smelting raw material feeding: Place rare earth metal ingots into the storage assembly (23) and place ferrosilicon alloy into the storage chamber in the intermediate cavity; S212, silicon-iron alloy blanking; S213. Rare earth metal ingots are fed into the intermediate cavity; S214. Rare earth metal ingots are fed into the vacuum melting furnace (3); S215. Preparation of rare earth ferrosilicon alloy bars: The rare earth metal ingot and the ferrosilicon alloy are melted and mixed evenly, and then kept at a constant temperature for 10 min-20 min to form the rare earth ferrosilicon alloy melt. After the rare earth ferrosilicon alloy melt solidifies, it is prepared into rare earth ferrosilicon alloy bars.

6. The method for preparing rare earth cored wire according to claim 5, characterized in that, Step S212 specifically includes: starting the first motor (223) to drive the outer feeding cylinder (22) to rotate, the feeding pusher plate (225) inside the outer feeding cylinder (22) pushes the ferrosilicon alloy to move, when the ferrosilicon alloy moves to the position of the second feeding port (241), it falls from the second feeding port (241) into the vacuum melting furnace (3) until all the ferrosilicon alloy in the intermediate cavity falls into the vacuum melting furnace (3), and the first motor (223) stops working.

7. The method for preparing rare earth cored wire according to claim 5, characterized in that, The specific steps of step S214 include: after the ferrosilicon alloy smelting has been completed for a specified time, the first motor (223) is started, which drives the outer feeding cylinder (22) to rotate, and the feeding pusher plate (225) pushes the rare earth metal ingots to move until all the rare earth metal ingots in the intermediate cavity fall from the second feeding port (241) into the vacuum melting furnace (3), and the first motor (223) stops working.

8. The method for preparing rare earth cored wire according to claim 5, characterized in that, Step S211 specifically includes: S2111, the lifting mechanism (13) drives the lifting sealing cover (11) to rise, opening the top opening of the sealing box (12), and placing the rod-shaped ferrosilicon alloy from the second feeding groove (221) into the storage chamber in the intermediate cavity, and placing the rod-shaped rare earth metal ingot from the first feeding groove (211) into the storage assembly (23).

9. The method for preparing rare earth cored wire according to claim 8, characterized in that, Step S211 further includes: S2112: After the rare earth metal ingots and ferrosilicon alloys have been transported, the lifting mechanism (13) drives the lifting sealing cover (11) to descend to abut against the top opening of the sealing box (12), so that the vacuum sealing box (1) remains sealed. S2113: Evacuate the vacuum chamber (1) to maintain a vacuum environment inside the vacuum chamber (1).

10. The method for preparing rare earth cored wire according to any one of claims 3, 5-9, characterized in that, Step S21 is carried out using a low-impurity, antioxidant rare earth cored wire preparation apparatus.

11. The method for preparing rare earth cored wire according to claim 4, characterized in that, Step S4 specifically includes: S41. Select a low carbon steel strip (300), perform rust removal and degreasing treatment on the low carbon steel strip (300), then anneal it at 800℃-900℃ for 2-3 hours, and cool it to room temperature; S42. The processed low-carbon steel strip (300) is wrapped around the rare earth silicon iron alloy powder coating layer (200) on the surface of the rare earth metal core material (100) by a wire wrapping machine to obtain a low-impurity oxidation-resistant rare earth cored wire.

12. A cored wire, characterized in that, The low-impurity, antioxidant rare earth cored wire is prepared by the method of any one of claims 1-11. The cored wire comprises, from the inside out, a rare earth metal core (100), a rare earth silicon-iron alloy powder coating layer (200), and a low carbon steel strip (300).

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