Permanent magnetic ferrite preparation method
A permanent ferrite and magnet technology, applied in the field of preparation of permanent ferrite magnets, can solve problems such as inability to obtain Br
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Embodiment 1
[0028] Wet grinding mixing: use water as the wet grinding dispersion medium, add raw materials and primary additives into the ball mill at the same time, carry out wet grinding mixing for 2 hours, and obtain wet grinding slurry. After the slurry is dried, the specific surface area of the powder is 2m 2 / g. In this embodiment, main ingredients iron red and strontium carbonate, according to Fe 2 o 3 with SrCO 3 The molar ratio n=6.18 is used for the preparation of main ingredients, and the ratio of primary additives is: CaCO 3 =0.2wt%, SiO 2 =0.3wt%;
[0029] Primary pre-firing: Pre-fire the slurry obtained in the mixing process in the air at a temperature of 1260°C and a holding time of 3 hours to obtain a primary pre-fired material;
[0030] Coarse pulverization: pulverize the above-mentioned primary calcined material with a ball mill to obtain coarse powder, and carry out particle size screening at the same time, and the particle size reaches 4.0 μm;
[0031] Fine gri...
Embodiment 2
[0038] Wet grinding mixing: use water as the wet grinding dispersion medium, add raw materials and primary additives into the ball mill at the same time, carry out wet grinding mixing for 10 hours, and obtain wet grinding slurry. After the slurry is dried, the specific surface area of the powder is 5m 2 / g. In this embodiment, main ingredients iron red and strontium carbonate, according to Fe 2 o 3 with SrCO 3 The molar ratio n=6.18 is used for the preparation of main ingredients, and the ratio of primary additives is: CaCO 3 =0.2wt%, SiO 2 =0.1wt%, Al 2 o 3 =0.6wt%;
[0039] Primary pre-firing: Pre-fire the slurry obtained in the mixing process in the air at a temperature of 1260°C and a holding time of 3 hours to obtain a primary pre-fired material;
[0040] Coarse pulverization: pulverize the above-mentioned primary calcined material with a ball mill to obtain coarse powder, and carry out particle size screening at the same time, and the particle size reaches 4.0 μ...
Embodiment 3
[0048] Wet grinding mixing: use water as the wet grinding dispersion medium, add raw materials and primary additives into the ball mill at the same time, carry out wet grinding mixing for 20 hours, and obtain wet grinding slurry. After the slurry is dried, the specific surface area of the powder is 10m 2 / g. In this embodiment, main ingredients iron red and strontium carbonate, according to Fe 2 o 3 with SrCO 3 The molar ratio n=6.18 is used for the preparation of main ingredients, and the ratio of primary additives is: CaCO 3 =0.2wt%, SiO 2 =0.1wt%, Al 2 o 3 =0.2wt%, kaolin=0.3wt%;
[0049] Primary pre-firing: Pre-fire the slurry obtained in the mixing process in the air at a temperature of 1260°C and a holding time of 3 hours to obtain a primary pre-fired material;
[0050] Coarse pulverization: pulverize the above-mentioned primary calcined material with a ball mill to obtain coarse powder, and carry out particle size screening at the same time, and the particle si...
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