Method for preparing nano composite permanent magnet material by adding zirconium into magnetic steel waste

[0027] Example 1

[0028] component

[0029] A nano-composite permanent magnetic material is batched according to the following table 1-1:

[0030] Table 1-1 Example 1 formula table

[0031] The preparation method of the above-mentioned nanocomposite permanent magnetic material of the present embodiment is as follows:

[0032] The collected waste magnetic steel is pre-classified according to the classification standard of the same batch and the same type of waste magnetic steel containing the same rare earth elements, and the magnet material is pretreated; then according to the prepared nanocomposite permanent magnetic material, the obtained The pretreated magnet material is directly subjected to hydrogen crushing and powdering to obtain rare earth hydrogen crushed magnetic powder; at the same time, the obtained rare earth hydrogen crushed magnetic powder is sampled and analyzed to obtain the composition parameters of rare earth magnetic powder, and then according to the composition parameters of rare earth magnetic powder obtained by analysis, in the obtained The rare earth hydrogen crushed magnetic powder is added with zirconium to obtain mixed powder, and finally the obtained mixed powder is crushed into fine powder by hydrogen crushing and jet mill, and a certain amount of air is put into the jet mill for passivation. The powder is mixed and stirred, the average particle size of the fine powder is 2.4 μm, and the fine powder is pressed into a compact by molding and isostatic pressing in turn, and the isostatic pressing pressure is 230MPa, and the compact density is 4.3g/cm 3; After all the fine powders are pressed, use the precipitation separation method to remove the remaining metal nanoparticles in the compaction reaction, and wash the compaction in deionized water for 3 to 5 times, ultrasonically oscillate, and then vacuum dry to obtain nano-permanent permanent magnet material blanks Then, the nano permanent magnet material body was sintered in a vacuum sintering furnace, the sintering temperature was 1070 ° C, and the temperature was kept for 200 minutes; then the sintered compact was cooled to 300 ° C in the vacuum sintering furnace, and then heated to 200 ° C. 900 ℃ and hold for 90 minutes, then cool down to 300 ℃ again, and heat up to 530 ℃ and hold for 200 minutes to obtain the nanocomposite permanent magnetic material; its performance test data is shown in Table 1-2.

[0033] Among them, Br is the remanence, Hcb is the coercive force, (B.H)max is the magnetic energy product, and MPa is the bending strength.

[0034] Table 1-2 Example 1 Product Performance Test Table

[0035] project

[0036] Example 2

[0037] A nano-composite permanent magnetic material is batched according to the following table 2-1:

[0038] Table 2-1 Example 2 formula table

[0039] component

[0040] The preparation method of the above-mentioned nanocomposite permanent magnetic material of the present embodiment is as follows:

[0041]The collected waste magnetic steel is pre-classified according to the classification standard of the same batch and the same type of waste magnetic steel containing the same rare earth elements, and the magnet material is pretreated; then according to the prepared nanocomposite permanent magnetic material, the obtained The pretreated magnet material is directly subjected to hydrogen crushing and powdering to obtain rare earth hydrogen crushed magnetic powder; at the same time, the obtained rare earth hydrogen crushed magnetic powder is sampled and analyzed to obtain the composition parameters of rare earth magnetic powder, and then according to the composition parameters of rare earth magnetic powder obtained by analysis, in the obtained The rare earth hydrogen crushed magnetic powder is added with zirconium to obtain mixed powder, and finally the obtained mixed powder is crushed into fine powder by hydrogen crushing and jet mill, and a certain amount of air is put into the jet mill for passivation. The powder is mixed and stirred, and the average particle size of the fine powder is 2.5 μm; the fine powder is sequentially pressed into a compact by molding and isostatic pressing, and the isostatic pressing pressure is 240MPa, and the compact density is 4.4g/cm 3; After all the fine powders are pressed, use the precipitation separation method to remove the remaining metal nanoparticles in the compaction reaction, and wash the compaction in deionized water for 3 to 5 times, ultrasonically oscillate, and then vacuum dry to obtain nano-permanent permanent magnet material blanks Then, the nano permanent magnet material body was sintered in a vacuum sintering furnace, the sintering temperature was 1080 ° C, and the temperature was kept for 200 minutes; then the sintered compact was cooled to 310 ° C in the vacuum sintering furnace, and then heated to 200 ° C. 900°C and kept for 90 minutes, then cooled to 310°C again, heated to 550°C and kept for 200 minutes, the nanocomposite permanent magnetic material was obtained; its performance test data are shown in Table 2-2.

[0042] Table 2-2 Example 2 Product Performance Test Table

[0043] project

[0044] Example 3

[0045] A nano-composite permanent magnetic material is batched according to the following table 3-1:

[0046] Table 3-1 Example 3 formula table

[0047] component

[0048] The preparation method of the above-mentioned nanocomposite permanent magnetic material of the present embodiment is as follows:

[0049] The collected waste magnetic steel is pre-classified according to the classification standard of the same batch and the same type of waste magnetic steel containing the same rare earth elements, and the magnet material is pretreated; then according to the prepared nanocomposite permanent magnetic material, the obtained The pretreated magnet material is directly subjected to hydrogen crushing and powdering to obtain rare earth hydrogen crushed magnetic powder; at the same time, the obtained rare earth hydrogen crushed magnetic powder is sampled and analyzed to obtain the composition parameters of rare earth magnetic powder, and then according to the composition parameters of rare earth magnetic powder obtained by analysis, in the obtained The rare earth hydrogen crushed magnetic powder is added with zirconium to obtain mixed powder, and finally the obtained mixed powder is crushed into fine powder by hydrogen crushing and jet mill, and a certain amount of air is put into the jet mill for passivation. The powder is mixed and stirred, and the average particle size of the fine powder is 2.6 μm; the fine powder is sequentially pressed into a compact by molding and isostatic pressing, and the isostatic pressing pressure is 250MPa, and the compact density is 4.4g/cm 3; After all the fine powders are pressed, use the precipitation separation method to remove the remaining metal nanoparticles in the compaction reaction, and wash the compaction in deionized water for 3 to 5 times, ultrasonically oscillate, and then vacuum dry to obtain nano-permanent permanent magnet material blanks Then, the nano permanent magnet material body was sintered in a vacuum sintering furnace, the sintering temperature was 1085 ° C, and the temperature was kept for 200 minutes; then the sintered compact was cooled to 320 ° C in the vacuum sintering furnace, and then heated to 200 ° C. 910°C and kept for 90 minutes, then cooled to 320°C again, heated to 570°C and kept for 200 minutes, the nanocomposite permanent magnetic material was obtained; its performance test data are shown in Table 3-2.

[0050] Table 3-2 Example 3 Product Performance Test Table

[0051] project