A method for producing a magnetic medium

Abstract

This invention relates to the field of soft magnetic alloy manufacturing technology and discloses a method for preparing magnetic media, comprising the following steps: Step 1, selecting Q195 steel wire / steel rod as the base material; Step 2, cutting the Q195 steel rod to the corresponding length according to the specifications of the magnetic separator used; Step 3, welding them into an integral media box structure; Step 4, subjecting the welded steel media box to degreasing, pickling, rust removal, and surface activation treatment; Step 5, placing the treated media box as a cathode in a chromium plating bath, and electroplating a layer of hard chromium (Cr) onto the surface; Step 6, washing and drying the media box after electroplating. This invention, by using Q195 low-carbon steel as the base material and simultaneously electroplating a layer of hard chromium (Cr) onto the entire surface of the base material, actually increases the mineral processing yield by 3-5 percentage points, achieving beneficial effects for physical mineral processing, especially for selecting weakly magnetic minerals such as copper-cobalt ore.

Description

Technical Field

[0001] This invention relates to the field of metal soft magnetic alloy manufacturing technology, specifically a method for preparing a magnetic medium. Background Technology

[0002] In the field of high-gradient magnetic separation technology, the magnetic medium, as the core carrier for directly adsorbing and separating magnetic particles, directly affects the separation efficiency and equipment operation stability. Early magnetic media generally used steel wool. Although its dense fiber structure can provide a high specific surface area and magnetic field gradient, which is conducive to the capture of fine magnetic particles, under actual wet mineral processing conditions, steel wool has significant defects such as easy corrosion. This not only shortens its service life but also easily causes mineral contamination. At the same time, due to the narrow gaps and chaotic structure between steel wool, fine mineral blockage is very likely to occur, leading to cleaning and maintenance difficulties and forced shutdowns, which seriously restricts the continuity of production. To solve the above problems, existing technologies have been gradually improved to use rod needles made of stainless iron materials such as 00Cr12 as magnetic media. This material has both good corrosion resistance and mechanical strength, effectively overcoming the disadvantages of traditional steel wool being easy to corrode and difficult to clean, significantly improving the durability and anti-clogging ability of the magnetic medium, and meeting the needs of industrial continuous production.

[0003] Although the magnetic induction intensity of 00Cr12 stainless steel bar needles after magnetization is not as high as that of steel wool, they are the mainstream technical solution in iron ore beneficiation due to their good corrosion resistance and mechanical strength. However, in copper-cobalt ore beneficiation, since copper-cobalt ore is a weakly magnetic material, a high remanent magnetic induction intensity is required after magnetization of the magnetic medium. The remanent magnetic induction intensity of 00Cr12 bar needles after magnetization is insufficient. If steel wool is used, technical problems such as short lifespan and clogging will still occur. Summary of the Invention

[0004] Technical problems to be solved: To address the shortcomings of existing technologies, this invention provides a method for preparing magnetic media, which has the advantages of being used in physical mineral processing, particularly for selecting weakly magnetic minerals such as copper-cobalt ore, thus solving the problems mentioned above.

[0005] Technical solution: To achieve the above objectives, the present invention provides the following technical solution: a method for preparing a magnetic medium, comprising the following steps: Step 1: Select Q195 steel wire / steel rod as the base material. Depending on the particle size of the copper-cobalt ore, select rods with diameters of 1.0, 1.5, 1.8, 2.0, 3.0, 4.0 or 5.0 mm. Step 2: Cut the Q195 steel rods to the corresponding length according to the specifications and model of the magnetic separator used. Step 3: Make the frame or perforated plate according to the specifications of the magnetic separator, insert the cut Q195 steel bars into the position in a matrix or staggered arrangement, and then fix them by welding to form an integral medium box structure. Step 4: Degrease, pickle, remove rust, and surface activate the welded steel media box; Step 5: Place the treated dielectric cell as the cathode into the chromium plating bath and electroplate a layer of hard chromium (Cr) onto the surface. Step 6: After the dielectric cell is electroplated, it is washed and dried, then hydrogen removal treatment is performed to eliminate the risk of hydrogen embrittlement. Finally, the coating thickness, appearance and dielectric cell size are inspected.

[0006] Preferably, the specific steps for cutting the steel bar in step two are as follows: S1.1 Parameter Determination and Calculation: Obtain the net installation clearance length L_0 of the magnetic separator media box, and reserve the double-sided assembly gap. and welding shrinkage allowance Through formula Calculate the theoretical cutting length; S1.2 Raw Material Inspection and Straightening: Incoming inspection of Q195 steel bars is conducted to ensure the chemical composition is correct. and diameter deviation Meets requirements; straightness exceeds The bar stock is pressure straightened to control its straightness within a certain range. within; S1.3, CNC fixed-length cutting: using a CNC rebar cutter. Input the calculation length Perform a trial cut on the first piece, measure the actual length, and calculate the compensation value. After confirming that everything is correct, proceed with the batch cutting. S1.4 End Face Finishing: The cut steel bars are finished by removing burrs from the cut surfaces using a grinding wheel. and conduct Regarding the diameter The bars are ground using a centerless grinder to ensure dimensional consistency. S1.5 Process Quality Inspection: Implement a strict sampling inspection system: 100% inspection of the first piece, and random inspection of 5 pieces out of every 50 pieces in batch production, using go / no-go gauges. The length tolerance of the test is in compliance with the standard. .

[0007] Preferably, in step four, the steel media box is degreased using an alkaline chemical degreasing method. A mixed solution consisting of 30% sodium hydroxide (NaOH), 30% sodium carbonate (Na2CO3), and 40% sodium phosphate is prepared and heated to 60-80°C. The media box is then completely immersed in the solution for 5-10 minutes to remove residual oil and fingerprints from the welding process through saponification and emulsification. Afterward, it is removed and rinsed with hot water above 60°C.

[0008] Preferably, the pickling and rust removal treatment of the steel media box in step four specifically involves: preparing a 15%-20% concentration hydrochloric acid (HCl) aqueous solution and adding hexamethylenetetramine for corrosion inhibition; immersing the media box in the acid solution to dissolve the oxide scale and rust layer generated during welding through a chemical reaction until the surface exhibits a uniform metallic luster; immediately rinsing with running cold water after removal to thoroughly neutralize and wash away residual acid and reaction products.

[0009] Preferably, the surface activation treatment of the steel medium box in step four is as follows: prepare a 3%-5% concentration of dilute sulfuric acid (H2SO4) activation solution; immerse the medium box in it for about 30-60 seconds to remove the passivation film formed after pickling, so as to expose the active sites on the metal surface and improve the adhesion between the subsequent chromium plating layer and the substrate; rinse it again with running cold water after treatment.

[0010] Preferably, a method for preparing a magnetic medium comprises the following steps: Step 1: Select Q195 steel wire / steel rod as the base material. Select rods with a diameter of 1.0mm according to the different particle sizes of copper-cobalt ore. Step 2: Cut the Q195 steel rods to the corresponding length according to the specifications and model of the magnetic separator used. Step 3: Make the frame or perforated plate according to the specifications of the magnetic separator, insert the cut Q195 steel bars into the position in a matrix or staggered arrangement, and then fix them by welding to form an integral medium box structure. Step 4: Degrease, pickle, remove rust, and surface activate the welded steel media box; Step 5: Place the treated dielectric cell as the cathode into the chromium plating bath and electroplate a layer of hard chromium (Cr) onto the surface. Step 6: After the dielectric cell is electroplated, it is washed and dried, then hydrogen removal treatment is performed to eliminate the risk of hydrogen embrittlement. Finally, the coating thickness, appearance and dielectric cell size are inspected.

[0011] Preferably, a method for preparing a magnetic medium comprises the following steps: Step 1: Select Q195 steel wire / steel rod as the base material. Select rods with a diameter of 1.5mm according to the different particle sizes of copper-cobalt ore. Step 2: Cut the Q195 steel rods to the corresponding length according to the specifications and model of the magnetic separator used. Step 3: Make the frame or perforated plate according to the specifications of the magnetic separator, insert the cut Q195 steel bars into the position in a matrix or staggered arrangement, and then fix them by welding to form an integral medium box structure. Step 4: Degrease, pickle, remove rust, and surface activate the welded steel media box; Step 5: Place the treated dielectric cell as the cathode into the chromium plating bath and electroplate a layer of hard chromium (Cr) onto the surface. Step 6: After the dielectric cell is electroplated, it is washed and dried, then hydrogen removal treatment is performed to eliminate the risk of hydrogen embrittlement. Finally, the coating thickness, appearance and dielectric cell size are inspected.

[0012] Preferably, a method for preparing a magnetic medium comprises the following steps: Step 1: Select Q195 material iron wire / steel rod as the base material. Select rods with a diameter of 1.8mm according to the different particle size of copper-cobalt ore. Step 2: Cut the Q195 steel rods to the corresponding length according to the specifications and model of the magnetic separator used. Step 3: Make the frame or perforated plate according to the specifications of the magnetic separator, insert the cut Q195 steel bars into the position in a matrix or staggered arrangement, and then fix them by welding to form an integral medium box structure. Step 4: Degrease, pickle, remove rust, and surface activate the welded steel media box; Step 5: Place the treated dielectric cell as the cathode into the chromium plating bath and electroplate a layer of hard chromium (Cr) onto the surface. Step 6: After the dielectric cell is electroplated, it is washed and dried, then hydrogen removal treatment is performed to eliminate the risk of hydrogen embrittlement. Finally, the coating thickness, appearance and dielectric cell size are inspected.

[0013] Preferably, a method for preparing a magnetic medium comprises the following steps: Step 1: Select Q195 steel wire / steel rod as the base material. Select rods with a diameter of 2.0mm according to the different particle sizes of copper-cobalt ore. Step 2: Cut the Q195 steel rods to the corresponding length according to the specifications and model of the magnetic separator used. Step 3: Make the frame or perforated plate according to the specifications of the magnetic separator, insert the cut Q195 steel bars into the position in a matrix or staggered arrangement, and then fix them by welding to form an integral medium box structure. Step 4: Degrease, pickle, remove rust, and surface activate the welded steel media box; Step 5: Place the treated dielectric cell as the cathode into the chromium plating bath and electroplate a layer of hard chromium (Cr) onto the surface. Step 6: After the dielectric cell is electroplated, it is washed and dried, then hydrogen removal treatment is performed to eliminate the risk of hydrogen embrittlement. Finally, the coating thickness, appearance and dielectric cell size are inspected.

[0014] Preferably, a method for preparing a magnetic medium comprises the following steps: Step 1: Select Q195 steel wire / steel rod as the base material. Select rods with a diameter of 5.0mm according to the different particle size of copper-cobalt ore. Step 2: Cut the Q195 steel rods to the corresponding length according to the specifications and model of the magnetic separator used. Step 3: Make the frame or perforated plate according to the specifications of the magnetic separator, insert the cut Q195 steel bars into the position in a matrix or staggered arrangement, and then fix them by welding to form an integral medium box structure. Step 4: Degrease, pickle, remove rust, and surface activate the welded steel media box; Step 5: Place the treated dielectric cell as the cathode into the chromium plating bath and electroplate a layer of hard chromium (Cr) onto the surface. Step 6: After the dielectric cell is electroplated, it is washed and dried, then hydrogen removal treatment is performed to eliminate the risk of hydrogen embrittlement. Finally, the coating thickness, appearance and dielectric cell size are inspected.

[0015] Compared with the prior art, the present invention provides a method for preparing a magnetic medium, which has the following beneficial effects: 1. This invention uses Q195 low-carbon steel as the substrate, leveraging its excellent soft magnetic properties to provide a powerful magnetic source. Simultaneously, to overcome the corrosion susceptibility of Q195 steel, this invention electroplats a layer of hard chromium (Cr) onto the entire substrate surface. This retains the high magnetic induction advantage while imparting excellent corrosion resistance, wear resistance, and anti-clogging capabilities to the medium. It also provides options from 1.0... mm to 5.0 With multiple diameter options available in mm, the refined structural adaptation further enhances the beneficiation accuracy. According to the data in the document, the Q195 chromium-plated magnetic medium prepared by this invention, when beneficiating copper-cobalt ore, actually increases the beneficiation yield by 3 to 5 percentage points compared to the original 00Cr12 stainless iron medium, achieving the beneficial effect of physical beneficiation, especially for selecting weakly magnetic minerals such as copper-cobalt ore.

[0016] 2. This invention uses Q195 low-carbon steel as the substrate, utilizing its excellent soft magnetic properties to provide a powerful magnetic source. The invention deposits a layer of hard chromium (Cr) on the entire surface of the substrate by electroplating, which not only retains the advantage of high magnetic induction, but also endows the medium with excellent corrosion resistance, wear resistance and anti-clogging ability, ensuring that the equipment maintains stable magnetic field performance during long-term operation, achieving the beneficial effect of increased yield compared with the original stainless iron medium. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the steps of the present invention; Figure 2 This is a schematic diagram of the medium box structure made of Q195 low-carbon steel rods according to the present invention; Figure 3 This is a schematic bar chart illustrating the yield improvement of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1 A method for preparing a magnetic medium, comprising the following steps: Step 1: Select Q195 steel wire / steel rod as the base material. Depending on the particle size of the copper-cobalt ore, select rods with diameters of 1.0, 1.5, 1.8, 2.0, 3.0, 4.0 or 5.0 mm. Step 2: Cut the Q195 steel rods to the corresponding length according to the specifications and model of the magnetic separator used. Step 3: Make the frame or perforated plate according to the specifications of the magnetic separator, insert the cut Q195 steel bars into the position in a matrix or staggered arrangement, and then fix them by welding to form an integral medium box structure. Step 4: Degrease, pickle, remove rust, and surface activate the welded steel media box; Step 5: Place the treated dielectric cell as the cathode into the chromium plating bath and electroplate a layer of hard chromium (Cr) onto the surface. Step 6: After the dielectric cell is electroplated, it is washed and dried, then hydrogen removal treatment is performed to eliminate the risk of hydrogen embrittlement. Finally, the coating thickness, appearance and dielectric cell size are inspected.

[0020] Example 1 Preparation of magnetic media with a diameter of 1.0 mm: First, the raw materials were selected. Q195 low-carbon steel rods were selected as the matrix material, and the diameter of the steel rods was selected to be 1.0 mm for fine-grained copper-cobalt ore.

[0021] Next, cut to length. Based on the specifications of the magnetic separator, determine the clearance length for the media box installation. And reserve a single-sided assembly gap. and welding shrinkage allowance at each end for Through formula Calculate the theoretical cutting length. Use a CNC rebar cutter with precise positioning. Cut the bars and straighten them with a straightness exceeding 2 mm / m using pressure straightening to control the straightness within 1 mm / m. After cutting, finish the cut surface to remove burrs. and do Chamfer.

[0022] Next, the media box is welded together. A frame of the appropriate size is made, and the cut 1.0 mm Q195 steel bars are inserted and positioned in a matrix or staggered arrangement. They are then fixed by welding to form an integral media box structure.

[0023] Then, pre-plating surface treatment is performed. First, the welded steel dielectric box is immersed in a mixed solution composed of 30% sodium hydroxide (NaOH), 30% sodium carbonate (Na2CO3), and 40% sodium phosphate, heated to 60~80℃ for degreasing for 5~10 minutes, and then rinsed with hot water above 60℃; next, it is immersed in a 15%~20% concentration hydrochloric acid (HCl) aqueous solution (containing hexamethylenetetramine corrosion inhibitor) for pickling and rust removal until the surface shows a uniform metallic luster, and then immediately rinsed with running cold water; finally, it is immersed in a 3%~5% concentration dilute sulfuric acid (H2SO4) activation solution for 30~60 seconds, and then rinsed clean again with running cold water.

[0024] Next, electroplating is performed. The treated dielectric cell is placed as the cathode in a chromium plating bath, and a layer of hard chromium (Cr) is electroplated onto its surface.

[0025] Finally, post-processing and inspection are carried out. After the dielectric cell is electroplated, it is washed with water and dried with hot air, followed by hydrogen removal treatment (such as baking at 200℃ for 2 hours) to eliminate the risk of hydrogen embrittlement. Finally, the coating thickness, appearance and dielectric cell dimensions are inspected. If they pass the inspection, they are considered finished products.

[0026] Example 2: Preparation of a magnetic medium with a diameter of 1.5 mm: First, the raw materials were selected. Q195 low-carbon steel rods were selected as the matrix material, and for medium to fine-grained copper-cobalt ore, the diameter of the steel rods was selected to be 1.5 mm.

[0027] Secondly, the material is cut to length. The cutting length is calculated according to the specifications of the matching magnetic separator, and strict raw material inspection and straightening are carried out to ensure that the diameter deviation is within 0.1 mm of the nominal diameter.

[0028] Next, the media box is welded together. A frame or perforated plate is made, and the cut 1.5 mm Q195 steel bars are inserted and positioned according to the set matrix or staggered arrangement. They are then fixed by welding to form an integral media box.

[0029] Then, pre-plating surface treatment is performed. Alkali degreasing (immersion in a 70℃ mixed solution), pickling and rust removal (18% HCl + hexamethylenetetramine), and surface activation (immersion in 4% H2SO4) are performed in sequence to ensure that there are no slag inclusions or oil stains in the welding area and that the substrate surface is fully activated.

[0030] Next, electroplating is performed. The dielectric box is placed in the chromium plating bath as the cathode, and the current density is controlled to ensure that the plating thickness is uniform at the edges of the 1.5 mm thin rod, preventing scorching or excessive thinness.

[0031] Finally, post-processing and inspection are carried out. After water washing, drying and hydrogen removal, the focus is on inspecting the appearance of the coating for pinholes and pits, and whether the dimensional tolerances meet the 0.5 mm standard.

[0032] Example 3: Preparation of magnetic media with a diameter of 1.8 mm: First, the raw materials were selected. Q195 low-carbon steel rods were selected as the matrix raw materials, and rods with a diameter of 1.8 mm were selected based on the particle size characteristics of copper-cobalt ore.

[0033] Next, perform fixed-length cutting. Calculate the cutting length L according to the magnetic separator specifications, and reserve the corresponding assembly gap and shrinkage allowance.

[0034] Next, the media box is welded together. Argon arc welding is used to connect the 1.8 mm steel rod to the frame to ensure a full weld without any incomplete welds, thereby improving the overall mechanical strength of the media box.

[0035] Then, pre-plating surface treatment is performed. In the pickling step, the pickling time is appropriately extended to ensure that the oxide scale on the surface of the 1.8 mm bar is completely dissolved, exposing a clean metal substrate.

[0036] Next, electroplating is performed. A layer of hard chromium is electroplated onto the surface of the dielectric cartridge, with the plating thickness controlled within the process requirements, and the hardness reaching HV800 or higher.

[0037] Finally, post-processing and inspection are carried out. Hydrogen removal treatment is performed to eliminate potential hydrogen embrittlement risks and ensure the product's fatigue life under alternating magnetic fields.

[0038] Example 4: Preparation of a magnetic medium with a diameter of 2.0 mm: First, the raw materials were selected. Q195 low-carbon steel rods were selected as the matrix material, and rods with a diameter of 2.0 mm were selected for coarser-grained copper-cobalt ore.

[0039] Secondly, the bars are cut to length. Due to the large diameter (geq 2.0 mm), a centerless grinder is used for continuous grinding after cutting, with a grinding amount of 0.05 sq 0.10 mm (single side) to further improve the consistency of the bar diameter.

[0040] Next, the dielectric housing is welded together. The finished 2.0 mm Q195 steel bars are arranged at a set density and welded together to form a complete dielectric housing.

[0041] Then, pre-plating surface treatment is performed. Activation time is strictly controlled (30-60 seconds) to prevent over-corrosion, effectively remove the passivation film formed after pickling, and maximize the active sites on the metal surface.

[0042] Next, electroplating is performed. The entire dielectric cartridge is electroplated to ensure consistent thickness of the inner and outer plating layers, forming a comprehensive anti-corrosion protective layer.

[0043] Finally, post-processing and inspection were carried out. Verification showed that using this 2.0 mm Q195 chromium-plated magnetic medium increased the yield by 3-5 percentage points compared to the original 00Cr12 stainless iron medium when separating copper-cobalt ore.

[0044] Data table and comparative example table of embodiments in this application ; ; Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a magnetic medium, characterized in that, It is prepared by the following steps: Step 1: Select Q195 steel wire / steel rod as the base material. Depending on the particle size of the copper-cobalt ore, select rods with diameters of 1.0, 1.5, 1.8, 2.0, 3.0, 4.0 or 5.0 mm. Step 2: Cut the Q195 steel rods to the corresponding length according to the specifications and model of the magnetic separator used. Step 3: Make the frame or perforated plate according to the specifications of the magnetic separator, insert the cut Q195 steel bars into the position in a matrix or staggered arrangement, and then fix them by welding to form an integral medium box structure. Step 4: Degrease, pickle, remove rust, and surface activate the welded steel media box; Step 5: Place the treated dielectric cell as the cathode into the chromium plating bath and electroplate a layer of hard chromium (Cr) onto the surface. Step 6: After the dielectric cell is electroplated, it is washed and dried, then hydrogen removal treatment is performed to eliminate the risk of hydrogen embrittlement. Finally, the coating thickness, appearance and dielectric cell size are inspected.

2. The method for preparing a magnetic medium according to claim 1, characterized in that: The specific steps for cutting the steel bar in step two are as follows: S1.1 Parameter Determination and Calculation: Obtain the net installation clearance length L_0 of the magnetic separator media box, and reserve the double-sided assembly gap. and welding shrinkage allowance Through formula Calculate the theoretical cutting length; S1.2 Raw Material Inspection and Straightening: Incoming inspection of Q195 steel bars is conducted to ensure the chemical composition is correct. and diameter deviation Meets requirements; straightness exceeds The bar stock is pressure straightened to control its straightness within a certain range. within; S1.3, CNC fixed-length cutting: using a CNC rebar cutter. Input the calculation length Perform a trial cut on the first piece, measure the actual length, and calculate the compensation value. After confirming that everything is correct, proceed with the batch cutting. S1.4 End Face Finishing: The cut steel bars are finished by removing burrs from the cut surfaces using a grinding wheel. and conduct Regarding the diameter The bars are ground using a centerless grinder to ensure dimensional consistency. S1.5 Process Quality Inspection: Implement a strict sampling inspection system: 100% inspection of the first piece, and random inspection of 5 pieces out of every 50 pieces in batch production, using go / no-go gauges. The length tolerance of the test is in compliance with the standard. .

3. The method for preparing a magnetic medium according to claim 2, characterized in that: In step four, the steel media box is degreased using an alkaline chemical degreasing method. A mixed solution consisting of 30% sodium hydroxide (NaOH), 30% sodium carbonate (Na2CO3), and 40% sodium phosphate is prepared and heated to 60-80°C. The media box is then completely immersed in the solution for 5-10 minutes to remove residual oil and fingerprints from the welding process through saponification and emulsification. Afterward, it is removed and rinsed with hot water above 60°C.

4. The method for preparing a magnetic medium according to claim 3, characterized in that: The pickling and rust removal treatment of the steel media box in step four is as follows: prepare a 15%-20% hydrochloric acid (HCl) aqueous solution and add hexamethylenetetramine for corrosion inhibition; immerse the media box in the acid solution to dissolve the oxide scale and rust layer generated by welding through chemical reaction until the surface shows a uniform metallic luster; immediately rinse with running cold water after removal to completely neutralize and wash away residual acid and reaction products.

5. The method for preparing a magnetic medium according to claim 4, characterized in that: The surface activation treatment of the steel medium box in step four is as follows: prepare a 3%-5% concentration of dilute sulfuric acid (H2SO4) activation solution; immerse the medium box in it for about 30-60 seconds to remove the passivation film formed after pickling, so as to expose the active sites on the metal surface and improve the adhesion between the subsequent chromium plating layer and the substrate; after treatment, rinse it again with running cold water.

6. The method for preparing a magnetic medium according to claim 1, characterized in that: It is prepared by the following steps: Step 1: Select Q195 steel wire / steel rod as the base material. Select rods with a diameter of 1.0mm according to the different particle sizes of copper-cobalt ore. Step 2: Cut the Q195 steel rods to the corresponding length according to the specifications and model of the magnetic separator used. Step 3: Make the frame or perforated plate according to the specifications of the magnetic separator, insert the cut Q195 steel bars into the position in a matrix or staggered arrangement, and then fix them by welding to form an integral medium box structure. Step 4: Degrease, pickle, remove rust, and surface activate the welded steel media box; Step 5: Place the treated dielectric cell as the cathode into the chromium plating bath and electroplate a layer of hard chromium (Cr) onto the surface. Step 6: After the dielectric cell is electroplated, it is washed and dried, then hydrogen removal treatment is performed to eliminate the risk of hydrogen embrittlement. Finally, the coating thickness, appearance and dielectric cell size are inspected.

7. The method for preparing a magnetic medium according to claim 1, characterized in that: It is prepared by the following steps: Step 1: Select Q195 steel wire / steel rod as the base material. Select rods with a diameter of 1.5mm according to the different particle sizes of copper-cobalt ore. Step 2: Cut the Q195 steel rods to the corresponding length according to the specifications and model of the magnetic separator used. Step 3: Make the frame or perforated plate according to the specifications of the magnetic separator, insert the cut Q195 steel bars into the position in a matrix or staggered arrangement, and then fix them by welding to form an integral medium box structure. Step 4: Degrease, pickle, remove rust, and surface activate the welded steel media box; Step 5: Place the treated dielectric cell as the cathode into the chromium plating bath and electroplate a layer of hard chromium (Cr) onto the surface. Step 6: After the dielectric cell is electroplated, it is washed and dried, then hydrogen removal treatment is performed to eliminate the risk of hydrogen embrittlement. Finally, the coating thickness, appearance and dielectric cell size are inspected.

8. The method for preparing a magnetic medium according to claim 1, characterized in that: It is prepared by the following steps: Step 1: Select Q195 steel wire / steel rod as the base material. Select rods with a diameter of 1.8mm according to the different particle sizes of copper-cobalt ore. Step 2: Cut the Q195 steel rods to the corresponding length according to the specifications and model of the magnetic separator used. Step 3: Make the frame or perforated plate according to the specifications of the magnetic separator, insert the cut Q195 steel bars into the position in a matrix or staggered arrangement, and then fix them by welding to form an integral medium box structure. Step 4: Degrease, pickle, remove rust, and surface activate the welded steel media box; Step 5: Place the treated dielectric cell as the cathode into the chromium plating bath and electroplate a layer of hard chromium (Cr) onto the surface. Step 6: After the dielectric cell is electroplated, it is washed and dried, then hydrogen removal treatment is performed to eliminate the risk of hydrogen embrittlement. Finally, the coating thickness, appearance and dielectric cell size are inspected.

9. The method for preparing a magnetic medium according to claim 1, characterized in that: It is prepared by the following steps: Step 1: Select Q195 steel wire / steel rod as the base material. Select rods with a diameter of 2.0mm according to the different particle sizes of copper-cobalt ore. Step 2: Cut the Q195 steel rods to the corresponding length according to the specifications and model of the magnetic separator used. Step 3: Make the frame or perforated plate according to the specifications of the magnetic separator, insert the cut Q195 steel bars into the position in a matrix or staggered arrangement, and then fix them by welding to form an integral medium box structure. Step 4: Degrease, pickle, remove rust, and surface activate the welded steel media box; Step 5: Place the treated dielectric cell as the cathode into the chromium plating bath and electroplate a layer of hard chromium (Cr) onto the surface. Step 6: After the dielectric cell is electroplated, it is washed and dried, then hydrogen removal treatment is performed to eliminate the risk of hydrogen embrittlement. Finally, the coating thickness, appearance and dielectric cell size are inspected.

10. The method for preparing a magnetic medium according to claim 1, characterized in that: It is prepared by the following steps: Step 1: Select Q195 steel wire / steel rod as the base material. Select rods with a diameter of 5.0mm according to the different particle size of copper-cobalt ore. Step 2: Cut the Q195 steel rods to the corresponding length according to the specifications and model of the magnetic separator used. Step 3: Make the frame or perforated plate according to the specifications of the magnetic separator, insert the cut Q195 steel bars into the position in a matrix or staggered arrangement, and then fix them by welding to form an integral medium box structure. Step 4: Degrease, pickle, remove rust, and surface activate the welded steel media box; Step 5: Place the treated dielectric cell as the cathode into the chromium plating bath and electroplate a layer of hard chromium (Cr) onto the surface. Step 6: After the dielectric cell is electroplated, it is washed and dried, then hydrogen removal treatment is performed to eliminate the risk of hydrogen embrittlement. Finally, the coating thickness, appearance and dielectric cell size are inspected.

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