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A kind of preparation method of bonded ferrite magnetic powder
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A ferrite magnetic, fine powder technology
Active Publication Date: 2021-07-20
北矿磁材科技有限公司
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However, the production process of iron red with high purity and low chlorine content is complicated, the production cycle is long, and the price is high, and the amount of acid used in the pickling step is large, and a large amount of water is required for washing after pickling, which increases the cost of water and gas
[0004] At present, there is no report on the method of producing high-performance bonded ferrite magnetic powder by using ferric red
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preparation example Construction
[0027] The invention provides a method for preparing bonded ferrite magnetic powder, specifically, the method comprises the following steps:
[0028] (1) A strontium-containing compound and / or a barium-containing compound is mixed with iron red to obtain a mixed material, and the mixed material is sintered to obtain a sintered material. Described iron red is high chloride iron red or low chloride iron red; The chlorine content of described high chloride iron red is 0.5-2.0wt.% (such as 0.5wt.%, 0.8wt.%, 0.9wt.%, 1.2wt.% %, 1.5wt.%, 1.8wt.% or 2.0wt.%); the chlorine content of the low chlorine iron red is less than 0.5wt.% (such as 0.01wt.%, 0.02wt.%, 0.05wt.%, 0.1wt.%, 0.15wt.%, 0.2wt.%, 0.3wt.%, 0.4wt.% or 0.45wt.%). The mixture is obtained by mixing iron red and strontium-containing compounds (such as strontium carbonate or strontium sulfate), the molar ratio of iron red and strontium-containing compounds is 5.7-5.9 (such as 5.7, 5.8 or 5.9), and / or the mixture It is obtai...
Embodiment 1
[0039] Perchlorferric iron red with a chlorine content of 0.8wt.% is weighed and mixed with strontium carbonate in a molar ratio of 5.7 to obtain a mixture, and the particle size is 3 μm according to the 0.3wt.% of the mixture amount, and zinc oxide with a purity of 99.5% is obtained. Strontium chloride is taken according to 2wt.% of the amount of the mixture, zinc oxide and strontium chloride are added to the mixture, stirred and mixed for 5 minutes, and then pre-sintered at 1050° C. for 2 hours to obtain a sintered material. Then, the obtained sintered material is ground into a coarse powder that can pass through a 60-mesh sieve with a pass-through ball mill, and then finely ground with a horizontal mixer for 1 hour to form a slurry with a particle size of 0.9 μm, and washed with water. The slurry was described until the pH value of the slurry was 8, and the slurry was dried at 200° C. for 1 hour for dehydration to obtain a fine powder. Then add 0.2wt.% ethylene glycol amine...
Embodiment 2
[0043] Example 2 was carried out in the same manner as Example 1, except that ferric red with a chlorine content of 2wt.% was weighed and mixed with strontium carbonate at a molar ratio of 5.7 to obtain a mixture.
[0044] Examples 3-12 were carried out in basically the same manner as in Example 1, with the differences shown in Table 1 below.
[0045]
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Abstract
The invention relates to a preparation method of bonded ferrite magnetic powder. The method adopts a strontium-containing compound and / or a barium-containing compound to be mixed with iron red to obtain a mixture, and the mixture is sintered to obtain a sintered material, and the obtained The sintered material is ground and passed through a sieve to obtain a coarse powder, and the coarse powder is finely ground into a slurry to obtain a fine powder, and then the alcohol amine mixture is added to the fine powder and mixed uniformly to obtain a ferrite magnetic powder, and finally the The obtained ferrite magnetic powder is annealed to obtain bonded ferrite magnetic powder. The method of the invention shortens the process route (without pickling), has low requirements on the purity of the raw materials (especially the chlorine content), has wider selection sources of raw materials, and is less difficult to control the production process, thereby greatly saving costs. The bonded ferrite magnetic powder prepared by the method of the present invention has high magnetic properties: its residual magnetic flux density is as high as 273mT, its intrinsic coercive force is as high as 310kA / m, and its maximum magnetic energy product is as high as 13.8kJ / m 3 .
Description
technical field [0001] The invention relates to the technical field of bonded ferrite, in particular to a preparation method of bonded ferrite magnetic powder. Background technique [0002] With the development of electric vehicles, maglev trains, high-performance motors, generators and other technologies, the demand for high-performance magnetic products is increasing. [0003] Iron red is the main raw material used in the ferrite industry, accounting for about 70% of soft ferrite raw materials and about 85% of permanent ferrite raw materials. In order to obtain high-performance bonded magnetic powder, the existing process generally adopts Iron red with high purity and low chlorine content (less than 0.5wt.%) is used as raw material to produce magnetic powder, and the annealed magnetic powder is pickled and dispersed in the production process, so that the particle size of the obtained magnetic powder is more uniform, thereby improving the bonding Magnetic properties of mag...
Claims
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