Preparation method of high-performance manganese-zinc ferrite powder

Abstract

This invention relates to a method for preparing high-performance manganese-zinc ferrite powder, comprising: (1) mixing the main raw material, defoamer, deionized water and auxiliary raw material evenly, and then ball milling once to obtain a slurry; wherein the main raw material includes pre-calcined manganese-zinc ferrite powder; (2) adding a binder and a dispersant to the slurry, and ball milling a second time to obtain a uniform slurry; (3) conveying the uniform slurry to a spray drying tower for spray granulation to obtain the high-performance manganese-zinc ferrite powder. The high-performance manganese-zinc ferrite powder obtained by this invention has the advantages of uniform particle size, high sphericity, high fluidity and high compaction density, and the process has high consistency and stability and good reproducibility between different batches.

Description

Technical Field

[0001] This invention relates to the field of soft magnetic ferrite materials technology, and in particular to a method for preparing high-performance manganese-zinc ferrite powder. Background Technology

[0002] Ferrite is a common ceramic material widely used in electronic components, such as transformer cores, inductors, and microwave devices. The common preparation process for manganese-zinc ferrite involves mixing the main components, pre-sintering the main components, adding additives, secondary ball milling and granulation, and secondary sintering. The secondary ball milling and granulation is the key process in preparing manganese-zinc ferrite particles. It transforms the mixed slurry into spherical particles with good flowability and uniform particle size through atomization and drying, for subsequent pressing and molding. The quality of the granulated powder (such as particle size distribution, sphericity, flowability, and compaction density) directly determines the performance of the final magnetic core product.

[0003] Currently, the common method for spray granulation of manganese-zinc ferrite in the industry is to mix pre-calcined manganese-zinc ferrite powder with deionized water, binder, dispersant, defoamer and other additives in one go or simply, and then perform a long ball milling to prepare a uniform slurry. This slurry is then granulated through a spray drying tower.

[0004] CN104387050A discloses a high-permeability manganese-zinc ferrite and its preparation method. The preparation method includes: 1) taking 52.0-53.0 mol% Fe2O3, 20.0-22.0 mol% ZnO and 25.0-28.0 mol% MnO, wet mixing for 20-40 min, spraying to obtain primary granules; 2) pre-calcining the primary granules at 700-900℃ for 2-3 hours to obtain ferrite pre-calcined material; 3) adding auxiliary components 0-250 ppm CaO and 100 ppm MnO according to the total weight of the ferrite pre-calcined material. -700ppm Bi₂O₃, 100-500ppm MoO₃, 0-300ppm Nb₂O₅, and 0-400ppm Ti₂O₅ were subjected to a second wet sand milling process; the particle size of the second wet milling slurry was controlled to 1.05-1.40μm to obtain a ferrite slurry; 4) 0.5wt% PVA binder, 0.5wt% dispersant 1-methylpentanol, and 0.2wt% defoamer siloxane were added to the ferrite slurry according to the weight of the pre-calcined ferrite material for spray granulation. The granulated powder was then molded to obtain a blank, and the density of the blank was controlled at 2.90-3.05g / cm³. 3 .

[0005] CN115010480A discloses a method for preparing manganese-zinc ferrite KAH100 material, which includes sequentially performing dry ball milling, pre-calcination, wet sand milling, spray granulation, preparation of blanks, and sintering treatment on the raw materials to obtain the high Curie temperature and high magnetic permeability manganese-zinc ferrite KAH100 material.

[0006] The aforementioned existing technologies mainly suffer from poor slurry homogenization: when all additives are added at once and ball-milled individually, various organic substances (binders, dispersants) may compete for adsorption on the powder surface, affecting their respective functions and impacting the stability and uniformity of the slurry. Furthermore, the poor slurry uniformity results in a wide particle size distribution in the powder obtained after spray granulation, potentially forming irregular or excessively large particles. This leads to high interparticle friction, affecting powder flowability and ultimately impacting powder compaction density.

[0007] Therefore, there is an urgent need for a new method for preparing high-performance manganese-zinc ferrite powder, which can produce manganese-zinc ferrite powder with uniform particle size, high sphericity, high flowability, and high compaction density. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention provides a method for preparing high-performance manganese-zinc ferrite powder. This invention employs a stepwise ball milling slurry preparation process. By optimizing the order of additive addition and the ball milling stages, the overall uniformity of the slurry can be achieved. By precisely controlling the amount of each additive added and the process parameters of spray granulation, manganese-zinc ferrite powder with uniform particle size, high sphericity, high flowability, and high compaction density is ultimately prepared.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] This invention provides a method for preparing high-performance manganese-zinc ferrite powder, the method comprising:

[0011] (1) After the main raw material, defoamer, deionized water and auxiliary raw material are mixed evenly, they are ball-milled once to obtain a slurry; the main raw material includes pre-calcined manganese zinc ferrite powder;

[0012] (2) The slurry is mixed with a binder and a dispersant and then ball-milled twice to obtain a uniform slurry;

[0013] (3) The uniform slurry is transported to a spray drying tower for spray granulation to obtain the high-performance manganese zinc ferrite powder.

[0014] This invention employs a stepwise ball milling slurry preparation process. By optimizing the order of additive addition and the ball milling stages, the overall uniformity of the slurry can be achieved. By precisely controlling the amount of each additive added and the process parameters of spray granulation, manganese-zinc ferrite powder with uniform particle size, high sphericity, high flowability, and high compaction density can be finally prepared.

[0015] As a preferred technical solution of the present invention, the defoamer in step (1) includes an acrylic resin defoamer; the acrylic resin defoamer includes any one or a combination of at least two of BYK-051, BYK-1790, BYK-055, and TEGO Airex 900, and typical but non-limiting examples of such combinations include: BYK-051 and BYK-1790, BYK-055 and BYK-051, BYK-055 and TEGO Airex 900, etc.

[0016] Preferably, the auxiliary raw material includes any one or a combination of at least two of calcium oxide, silicon dioxide, and aluminum oxide. Typical but non-limiting examples of such combinations include calcium oxide and silicon dioxide, calcium oxide and aluminum oxide, and silicon dioxide and aluminum oxide.

[0017] As a preferred technical solution of the present invention, the mass of the defoamer in step (1) is 0.5-1% of the mass of the main raw material, such as 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0018] Preferably, the mass ratio of the deionized water to the main raw material is (0.8-1):1, for example, 0.8:1, 0.82:1, 0.85:1, 0.88:1, 0.9:1, 0.92:1, 0.95:1, 1:1, etc., but it is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0019] Preferably, the mass of the auxiliary raw material is 0.5-1% of the mass of the main raw material, such as 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0020] As a preferred technical solution of the present invention, the first ball milling in step (1) includes adding ball milling media to the mixture of the main raw material, defoamer, deionized water and auxiliary raw material, and performing a first ball milling.

[0021] This invention involves mixing the main raw material with defoamer, deionized water and auxiliary raw materials, and then performing a single ball milling process. This single ball milling process, without interference from a large amount of organic matter, thoroughly crushes and mixes the materials, providing a uniform base slurry for subsequent steps.

[0022] Preferably, the milling media comprises stainless steel balls.

[0023] Preferably, the mass ratio of the ball milling media to the mixture is 1:(3-5), such as 1:3, 1:3.5, 1:4, 1:4.5, 1:5, etc., but it is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0024] Preferably, the time for one ball milling is 1-2 hours, such as 1 hour, 1.2 hours, 1.4 hours, 1.6 hours, 1.8 hours, 2 hours, etc., but it is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0025] As a preferred technical solution of the present invention, the adhesive in step (2) includes polyvinyl alcohol.

[0026] Preferably, the dispersant in step (2) includes polyacrylamide.

[0027] As a preferred technical solution of the present invention, the mass of the adhesive in step (2) is 10-12% of the mass of the main raw material, such as 10%, 10.2%, 10.5%, 10.8%, 11%, 11.3%, 11.5%, 11.7%, 12%, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0028] Preferably, the mass of the dispersant is 0.5-1% of the mass of the main raw material, such as 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0029] As a preferred technical solution of the present invention, the secondary ball milling time in step (2) is 0.5-1h, for example 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, 1h, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0030] In this invention, a secondary ball mill is performed on the already well-dispersed base slurry, to which a binder and a dispersant are added. At this stage, the dispersant can more effectively adsorb onto the particle surface, preventing particle re-agglomeration; the binder can then uniformly coat the particles. This secondary ball milling ensures the uniformity and stability of the slurry.

[0031] As a preferred technical solution of the present invention, the nozzle rotation speed of the spray granulation in step (3) is 3000-5000 RPM, such as 3000 RPM, 3300 RPM, 3500 RPM, 4000 RPM, 4500 RPM, 4800 RPM, 5000 RPM, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0032] As a preferred technical solution of the present invention, the air inlet temperature of the spray granulation in step (3) is 180-190℃, such as 180℃, 182℃, 184℃, 186℃, 188℃, 190℃, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0033] This invention controls the inlet air temperature of spray granulation, and low-temperature preparation ensures a smooth final particle surface, ultimately producing manganese-zinc ferrite powder with uniform particle size, high sphericity, high flowability, and high compaction density.

[0034] As a preferred technical solution of the present invention, the preparation method includes:

[0035] (1) After the main raw material, defoamer, deionized water and auxiliary raw material are mixed evenly, they are ball-milled once to obtain a slurry; the main raw material includes pre-calcined manganese zinc ferrite powder;

[0036] The defoamer includes acrylic resin defoamers; the acrylic resin defoamers include any one or a combination of at least two of BYK-051, BYK-1790, BYK-055, and TEGO Airex 900; the auxiliary raw materials include any one or a combination of at least two of calcium oxide, silicon dioxide, and aluminum oxide; the mass of the defoamer is 0.5-1% of the mass of the main raw materials; the mass ratio of deionized water to the main raw materials is (0.8-1):1;

[0037] The first ball milling process involves adding ball milling media to the mixture of the main raw material, defoamer, deionized water, and auxiliary raw materials, and performing a first ball milling; the mass ratio of the ball milling media to the mixture is 1:(3-5); the first ball milling time is 1-2 hours.

[0038] (2) The slurry is mixed with a binder and a dispersant and then ball-milled twice to obtain a uniform slurry;

[0039] The binder comprises polyvinyl alcohol; the dispersant comprises polyacrylamide; the mass of the binder is 10-12% of the mass of the main raw material; the mass of the dispersant is 0.5-1% of the mass of the main raw material; the secondary ball milling time is 0.5-1 h;

[0040] (3) The uniform slurry is transported to a spray drying tower for spray granulation to obtain the high-performance manganese zinc ferrite powder;

[0041] The nozzle rotation speed of the spray granulation is 3000-5000 RPM; the inlet air temperature of the spray granulation is 180-190℃.

[0042] Compared with the prior art, the present invention has at least the following beneficial effects:

[0043] This invention employs a stepwise ball milling slurry preparation process. By optimizing the order of additive addition and the ball milling stages, the overall uniformity of the slurry can be achieved. By precisely controlling the amount of each additive added and the process parameters of spray granulation, manganese-zinc ferrite powder with uniform particle size, high sphericity, high flowability, and high compaction density can be finally prepared. Detailed Implementation

[0044] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0045] Example 1

[0046] This embodiment provides a method for preparing high-performance manganese-zinc ferrite powder, the preparation method comprising:

[0047] (1) After mixing the pre-calcined manganese zinc ferrite powder, BYK-051 defoamer, deionized water and calcium oxide evenly, the mixture is ball-milled once to obtain a slurry; the mass of the BYK-051 defoamer is 0.5% of the mass of the pre-calcined manganese zinc ferrite powder; the mass ratio of the deionized water to the pre-calcined manganese zinc ferrite powder is 0.8:1; the mass of the calcium oxide is 0.5% of the mass of the pre-calcined manganese zinc ferrite powder.

[0048] The first ball milling process involves adding ball milling media to the mixture of the pre-calcined manganese zinc ferrite powder, BYK-051 defoamer, deionized water, and calcium oxide, and then performing a first ball milling; the mass ratio of the ball milling media to the mixture is 1:3; and the first ball milling time is 1 hour.

[0049] (2) Add polyvinyl alcohol and polyacrylamide to the slurry and perform secondary ball milling to obtain a uniform slurry;

[0050] The mass of the polyvinyl alcohol is 12% of the mass of the pre-calcined manganese-zinc ferrite powder; the mass of the polyacrylamide is 1% of the mass of the pre-calcined manganese-zinc ferrite powder; the secondary ball milling time is 0.5 h;

[0051] (3) The uniform slurry is transported to the spray drying tower for spray granulation to obtain the high-performance manganese zinc ferrite powder; the nozzle rotation speed of the spray granulation is 3000 RPM; the air inlet temperature of the spray granulation is 180℃.

[0052] Example 2

[0053] This embodiment provides a method for preparing high-performance manganese-zinc ferrite powder, the preparation method comprising:

[0054] (1) After mixing the pre-calcined manganese zinc ferrite powder, BYK-055 defoamer, deionized water and silica evenly, the mixture is ball-milled once to obtain a slurry; the mass of the BYK-055 defoamer is 0.7% of the mass of the pre-calcined manganese zinc ferrite powder; the mass ratio of the deionized water to the pre-calcined manganese zinc ferrite powder is 0.9:1; the mass of the silica is 0.7% of the mass of the pre-calcined manganese zinc ferrite powder.

[0055] The first ball milling process involves adding ball milling media to the mixture of the pre-calcined manganese zinc ferrite powder, BYK-055 defoamer, deionized water, and silica, and then performing a first ball milling; the mass ratio of the ball milling media to the mixture is 1:4; and the first ball milling time is 1.5 hours.

[0056] (2) Add polyvinyl alcohol and polyacrylamide to the slurry and perform secondary ball milling to obtain a uniform slurry;

[0057] The mass of the polyvinyl alcohol is 11% of the mass of the pre-calcined manganese-zinc ferrite powder; the mass of the polyacrylamide is 0.8% of the mass of the pre-calcined manganese-zinc ferrite powder; and the secondary ball milling time is 0.7 h.

[0058] (3) The uniform slurry is transported to the spray drying tower for spray granulation to obtain the high-performance manganese zinc ferrite powder; the nozzle rotation speed of the spray granulation is 4000 RPM; the air inlet temperature of the spray granulation is 185℃.

[0059] Example 3

[0060] This embodiment provides a method for preparing high-performance manganese-zinc ferrite powder, the preparation method comprising:

[0061] (1) After mixing the pre-calcined manganese zinc ferrite powder, BYK-1790 defoamer, deionized water and alumina evenly, the mixture is ball-milled once to obtain a slurry; the mass of the BYK-1790 defoamer is 1% of the mass of the pre-calcined manganese zinc ferrite powder; the mass ratio of the deionized water to the pre-calcined manganese zinc ferrite powder is 1:1; the mass of the alumina is 1% of the mass of the pre-calcined manganese zinc ferrite powder.

[0062] The first ball milling process involves adding ball milling media to the mixture of the pre-calcined manganese zinc ferrite powder, BYK-1790 defoamer, deionized water, and alumina, and then performing a first ball milling; the mass ratio of the ball milling media to the mixture is 1:5; and the first ball milling time is 2 hours.

[0063] (2) Add polyvinyl alcohol and polyacrylamide to the slurry and perform secondary ball milling to obtain a uniform slurry;

[0064] The mass of the polyvinyl alcohol is 10% of the mass of the pre-calcined manganese-zinc ferrite powder; the mass of the polyacrylamide is 0.5% of the mass of the pre-calcined manganese-zinc ferrite powder; and the secondary ball milling time is 1 hour.

[0065] (3) The uniform slurry is transported to a spray drying tower for spray granulation to obtain the high-performance manganese zinc ferrite powder; the nozzle rotation speed of the spray granulation is 5000 RPM; the air inlet temperature of the spray granulation is 190℃.

[0066] Example 4

[0067] This embodiment provides a method for preparing high-performance manganese zinc ferrite powder. The difference from Embodiment 1 is that the mass of the BYK-051 defoamer in step (1) is 0.1% of the mass of the pre-calcined manganese zinc ferrite powder. All other aspects are the same as in Embodiment 1.

[0068] Example 5

[0069] This embodiment provides a method for preparing high-performance manganese zinc ferrite powder. The difference from Embodiment 1 is that the mass of the BYK-051 defoamer in step (1) is 1.5% of the mass of the pre-calcined manganese zinc ferrite powder. All other aspects are the same as in Embodiment 1.

[0070] Example 6

[0071] This embodiment provides a method for preparing high-performance manganese-zinc ferrite powder. The difference from Embodiment 1 is that the mass of polyvinyl alcohol in step (2) is 5% of the mass of the pre-calcined manganese-zinc ferrite powder, while the rest is the same as in Embodiment 1.

[0072] Example 7

[0073] This embodiment provides a method for preparing high-performance manganese-zinc ferrite powder. The difference from Embodiment 1 is that the mass of polyvinyl alcohol in step (2) is 15% of the mass of the pre-calcined manganese-zinc ferrite powder, while the rest is the same as in Embodiment 1.

[0074] Example 8

[0075] This embodiment provides a method for preparing high-performance manganese zinc ferrite powder. The difference from Embodiment 1 is that the mass of polyacrylamide in step (2) is 0.1% of the mass of the pre-calcined manganese zinc ferrite powder, and all other steps are the same as in Embodiment 1.

[0076] Example 9

[0077] This embodiment provides a method for preparing high-performance manganese zinc ferrite powder. The difference from Embodiment 1 is that the mass of polyacrylamide in step (2) is 1.5% of the mass of the pre-calcined manganese zinc ferrite powder, and all other steps are the same as in Embodiment 1.

[0078] Example 10

[0079] This embodiment provides a method for preparing high-performance manganese-zinc ferrite powder. The difference from Embodiment 1 is that the nozzle rotation speed of spray granulation in step (3) is 2000 RPM, while the rest is the same as in Embodiment 1.

[0080] Example 11

[0081] This embodiment provides a method for preparing high-performance manganese-zinc ferrite powder. The difference from Embodiment 1 is that the nozzle rotation speed of spray granulation in step (3) is 6000 RPM, while the rest is the same as in Embodiment 1.

[0082] Example 12

[0083] This embodiment provides a method for preparing high-performance manganese-zinc ferrite powder. The difference from Embodiment 1 is that the air inlet temperature for spray granulation in step (3) is 170°C, while the rest is the same as in Embodiment 1.

[0084] Example 13

[0085] This embodiment provides a method for preparing high-performance manganese-zinc ferrite powder. The difference from Embodiment 1 is that the air inlet temperature for spray granulation in step (3) is 200°C, while the rest is the same as in Embodiment 1.

[0086] Comparative Example 1

[0087] This comparative example provides a method for preparing high-performance manganese-zinc ferrite powder. The difference from Example 1 is that a secondary ball milling process is not performed. Instead, the pre-calcined manganese-zinc ferrite powder, BYK-055 defoamer, deionized water, silica, polyvinyl alcohol, and polyacrylamide are mixed evenly and then ball-milled once. All other aspects are the same as in Example 1.

[0088] Comparative Example 2

[0089] This comparative example provides a method for preparing high-performance manganese-zinc ferrite powder. The difference from Example 1 is that the BYK-055 defoamer in step (1) is replaced with polyacrylamide by mass, while all other steps are the same as in Example 1.

[0090] Performance testing

[0091] The average particle size and average sphericity of the high-performance manganese zinc ferrite powders prepared in Examples 1-13 and Comparative Examples 1-2 were tested, and the results are shown in Table 1.

[0092] Table 1

[0093]

[0094] The test results show that:

[0095] (1) As can be seen from Examples 1 to 3, the present invention uses a stepwise ball milling slurry preparation process to prepare manganese zinc ferrite powder with uniform particle size, high sphericity, high fluidity and high compaction density.

[0096] (2) By comparing Example 1 with Examples 4-13, it can be seen that the present invention can further improve the sphericity and particle size uniformity of manganese zinc ferrite powder by precisely controlling the amount of each additive and the process parameters of spray granulation.

[0097] (3) By comparing Example 1 with Comparative Examples 1-2, it can be seen that Comparative Example 1 does not perform secondary ball milling, but mixes the raw materials in one go. Various organic substances (binders, dispersants) may compete for adsorption on the powder surface, affecting the full play of their respective functions, affecting the stability and uniformity of the slurry, and ultimately resulting in low sphericity and poor particle size uniformity of the manganese zinc ferrite powder. In Comparative Example 2, replacing the defoamer with a dispersant will also affect the sphericity and particle size uniformity of the manganese zinc ferrite powder.

[0098] In summary, this invention provides a method for preparing high-performance manganese-zinc ferrite powder. By employing a stepwise ball milling slurry preparation process and optimizing the order of additive addition and the ball milling stages, the invention can achieve overall uniformity of the slurry. By precisely controlling the amount of each additive and the process parameters of spray granulation, manganese-zinc ferrite powder with uniform particle size, high sphericity, high flowability, and high compaction density is finally prepared.

[0099] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A method for preparing high-performance manganese-zinc ferrite powder, characterized in that, The preparation method includes: (1) After the main raw material, defoamer, deionized water and auxiliary raw material are mixed evenly, they are ball-milled once to obtain a slurry; the main raw material includes pre-calcined manganese zinc ferrite powder; (2) The slurry is mixed with a binder and a dispersant and then ball-milled twice to obtain a uniform slurry; (3) The uniform slurry is transported to a spray drying tower for spray granulation to obtain the high-performance manganese zinc ferrite powder.

2. The preparation method according to claim 1, characterized in that, The defoamer in step (1) includes acrylic resin defoamers; the acrylic resin defoamers include any one or a combination of at least two of BYK-051, BYK-1790, BYK-055, and TEGO Airex 900; Preferably, the auxiliary raw materials include any one or a combination of at least two of calcium oxide, silicon dioxide, and aluminum oxide.

3. The preparation method according to claim 1 or 2, characterized in that, In step (1), the mass of the defoamer is 0.5-1% of the mass of the main raw material; Preferably, the mass ratio of the deionized water to the main raw material is (0.8-1):

1.

4. The preparation method according to any one of claims 1-3, characterized in that, Step (1) The first ball milling includes adding ball milling media to the mixture of the main raw material, defoamer, deionized water and auxiliary raw material, and performing a first ball milling; Preferably, the mass ratio of the milling media to the mixture is 1:(3-5); Preferably, the ball milling time is 1-2 hours.

5. The preparation method according to any one of claims 1-4, characterized in that, The adhesive in step (2) includes polyvinyl alcohol; Preferably, the dispersant in step (2) includes polyacrylamide.

6. The preparation method according to any one of claims 1-5, characterized in that, In step (2), the mass of the adhesive is 10-12% of the mass of the main raw material; Preferably, the mass of the dispersant is 0.5-1% of the mass of the main raw material.

7. The preparation method according to any one of claims 1-6, characterized in that, The secondary ball milling time in step (2) is 0.5-1h.

8. The preparation method according to any one of claims 1-7, characterized in that, The nozzle rotation speed for spray granulation in step (3) is 3000-5000 RPM.

9. The preparation method according to any one of claims 1-8, characterized in that, The inlet air temperature for spray granulation in step (3) is 180-190℃.

10. The preparation method according to any one of claims 1-8, characterized in that, The preparation method includes: (1) After the main raw material, defoamer, deionized water and auxiliary raw material are mixed evenly, they are ball-milled once to obtain a slurry; the main raw material includes pre-calcined manganese zinc ferrite powder; The defoamer includes acrylic resin defoamers; the acrylic resin defoamers include any one or a combination of at least two of BYK-051, BYK-1790, BYK-055, and TEGO Airex 900; the auxiliary raw materials include any one or a combination of at least two of calcium oxide, silicon dioxide, and aluminum oxide; the mass of the defoamer is 0.5-1% of the mass of the main raw materials; the mass ratio of deionized water to the main raw materials is (0.8-1):1; The first ball milling process involves adding ball milling media to the mixture of the main raw material, defoamer, deionized water, and auxiliary raw materials, and performing a first ball milling; the mass ratio of the ball milling media to the mixture is 1:(3-5); the first ball milling time is 1-2 hours. (2) The slurry is mixed with a binder and a dispersant and then ball-milled twice to obtain a uniform slurry; The binder comprises polyvinyl alcohol; the dispersant comprises polyacrylamide; the mass of the binder is 10-12% of the mass of the main raw material; the mass of the dispersant is 0.5-1% of the mass of the main raw material; the secondary ball milling time is 0.5-1 h; (3) The uniform slurry is transported to a spray drying tower for spray granulation to obtain the high-performance manganese zinc ferrite powder; The nozzle rotation speed of the spray granulation is 3000-5000 RPM; the inlet air temperature of the spray granulation is 180-190℃.

Images