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Method for preparing adhesive ferrite magnetic powder

A ferrite magnet and coarse powder technology, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of increasing water and gas costs, complicated iron red production process, and long production cycle, etc., to achieve Effects of reducing drying gas consumption, reducing surface activity, and reducing raw material costs

Active Publication Date: 2017-11-28
北矿磁材科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Method for preparing adhesive ferrite magnetic powder
  • Method for preparing adhesive ferrite magnetic powder

Examples

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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 method for preparing adhesive ferrite magnetic powder. The method comprises the following steps: mixing a strontium-containing compound and / or a barium-containing compound with iron oxide red so as to obtain a mixed material, sintering the mixed material so as to obtain a sintered material, crushing the obtained sintered material, screening with a screening net so as to obtain crude powder, finely grinding the crude powder into slurry so as to obtain fine powder, further uniformly mixing the fine powder with an alcamines mixture so as to obtain ferrite magnetic powder, and finally annealing the obtained ferrite magnetic powder, thereby obtaining the adhesive ferrite magnetic powder. By adopting the method, a process route is shortened (without acid pickling), the purity of raw materials is lowly required (particularly the content of chlorine), the raw materials are relatively widely selected, the production process is low in control difficulty, and the cost is greatly reduced. The adhesive ferrite magnetic powder prepared by using the method is high in magnetism, the residual magnetic flux density of the powder is as high as 273mT, the intrinsic coercive force of the powder is as high as 310kA / m, and the maximum magnetic energy product of the powder 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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Application Information

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IPC IPC(8): C04B35/26C04B35/626C04B35/64H01F1/113H01F41/02
CPCC04B35/2683C04B35/6261C04B35/64C04B2235/3213C04B2235/3215C04B2235/3284H01F1/113H01F41/0253
Inventor 胡国辉刘荣明熊君张威峰全小康高俊彦朱代漫贾立颖揣丹王倩李炳山
Owner 北矿磁材科技有限公司
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