Barium ferrite pre-sintered material and preparation method thereof
A technology of barium ferrite and pre-fired material, which is applied in the production process of permanent magnet ferrite, can solve the problems of low Hcj index, high price, and low bonding performance of pre-fired material, and achieve simple process and low production cost Effect
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Example Embodiment
[0020] Example 1
[0021] Mixing raw iron oxide and barium carbonate powder with a molar ratio of 5.9:1, and the raw iron oxide is iron oxide powder by-product of acid regeneration;
[0022] The mixture is subjected to wet ball milling, and the ball milling time is 1.5 hours; after ball milling, the composition of the mixture is uniform, and the slurry particle size is fine and the distribution is narrow;
[0023] After ball milling, it is put into a rotary kiln for pre-sintering, the pre-sintering temperature is 1020℃, the holding time is controlled at 3.2 hours, and barium ferrite is generated after the pre-sintering;
[0024] Put the pre-fired material into a ball mill for dry coarse grinding, and the particle size after dry grinding is 4.2μm to ensure that a good particle size distribution can be obtained after ball milling.
[0025] The performance indicators of barium ferrite pre-fired material are: average particle size: 4.2μm, compact Br=1260Gs, compact Hcj=3320Oe.
Example Embodiment
[0026] Example 2
[0027] Mixing raw iron oxide and barium carbonate powder with a molar ratio of 5.6:1, and the raw iron oxide is iron oxide powder by-product of acid regeneration;
[0028] The mixture is subjected to wet ball milling, and the ball milling time is 2 hours; after ball milling, the composition of the mixture is uniform, and the slurry particle size is fine and the distribution is narrow;
[0029] After ball milling, it is put into a rotary kiln for pre-sintering, the pre-sintering temperature is 1100℃, and the holding time is controlled at 4 hours to produce barium ferrite;
[0030] Put the pre-fired material into a ball mill for dry coarse grinding, the particle size after dry grinding is 3.5μm, to ensure that a good particle size distribution can be obtained after ball milling.
[0031] The performance indicators of this barium ferrite pre-fired material are: average particle size: 3.5μm, compact Br=1265Gs, compact Hcj=3260Oe.
Example Embodiment
[0032] Example 3
[0033] Mixing raw iron oxide and barium carbonate powder with a molar ratio of 5.4:1, and the raw iron oxide is an acid regeneration by-product iron oxide powder;
[0034] The mixture is subjected to wet ball milling, and the ball milling time is 3 hours; after ball milling, the composition of the mixture is uniform, and the slurry particle size is fine and the distribution is narrow;
[0035] After ball milling, it is put into a rotary kiln for pre-sintering, the pre-sintering temperature is 1120 ℃, and the holding time is controlled at 4.2 hours after the pre-sintering barium ferrite;
[0036] Put the pre-fired material into a ball mill for dry rough grinding, and the particle size after dry grinding is 3.2μm to ensure that a good particle size distribution can be obtained after ball milling.
[0037] The performance indicators of this barium ferrite pre-fired material are: average particle size: 3.2μm, compact Br=1268Gs, compact Hcj=3200Oe.
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