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Preparation method of rubber-plastic ferrite magnetic powder

A ferrite magnet, rubber and plastic technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve problems such as chloride removal

Active Publication Date: 2019-03-08
ANTE MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the subsequent process of preparing rubber and plastic ferrite magnetic powder, the residual strontium chloride needs to be removed by water washing, but the current production process is difficult to completely remove the chloride

Method used

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  • Preparation method of rubber-plastic ferrite magnetic powder
  • Preparation method of rubber-plastic ferrite magnetic powder

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preparation example Construction

[0023] The invention provides a method for preparing rubber-plastic ferrite magnetic powder, comprising the following steps:

[0024] Mixing the first iron raw material with the alkaline earth metal salt raw material to obtain a mixed material; the alkaline earth metal salt raw material includes strontium carbonate or barium carbonate;

[0025] Pre-burning the mixed material to obtain pellets;

[0026] Coarsely crushing the pellets to obtain coarse powder;

[0027] Mixing the coarse powder, carbonate, second iron raw material and water and performing wet fine grinding to obtain a slurry;

[0028] The slurry is dehydrated and dried, then tempered to obtain rubber-plastic ferrite magnetic powder.

[0029] In the invention, the first iron raw material is mixed with the alkaline earth metal salt raw material to obtain the mixed material. In the present invention, the first iron raw material preferably includes iron red or iron scale, more preferably iron red; the particle size ...

Embodiment 1

[0046] 1308g iron red and 267g strontium carbonate were mixed uniformly to obtain a mixed material;

[0047] Pre-calcining the mixed material at 1040°C for 1 hour to obtain pellets;

[0048] Coarsely crushing the pellets to obtain a coarse powder with an average particle size of 2.5 μm;

[0049] 1000g of coarse powder, 22.5g of ammonium bicarbonate, 273.3g of iron red and 1200g of water are subjected to wet fine grinding until the average particle size of the solid particles in the resulting slurry is 1.0 μm;

[0050] The slurry was dehydrated and dried, and the obtained dry material was tempered and kept at 920° C. for 1 hour to obtain rubber-plastic ferrite magnetic powder.

Embodiment 2

[0052] 1308g iron red and 267g barium carbonate are mixed homogeneously, obtain mixed material;

[0053] Pre-calcining the mixed material at 1050°C for 1 hour to obtain pellets;

[0054] Coarsely crushing the pellets to obtain a coarse powder with an average particle size of 2.6 μm;

[0055] 1000g of coarse powder, 30.2g of sodium carbonate, 273.3g of iron red and 1200g of water are wet-milled until the average particle size of the solid particles in the resulting slurry is a slurry of 0.98 μm;

[0056] The slurry was dehydrated and dried, and the obtained dried material was tempered and kept at 920° C. for 1 hour to obtain rubber-plastic ferrite magnetic powder.

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Abstract

The invention relates to the technical field of magnetic materials, in particular to a preparation method of a rubber-plastic ferrite magnetic powder. The method comprises the following steps: mixinga first iron raw material with an alkaline earth metal salt raw material to obtain a mixed material, wherein the alkaline earth metal salt raw material comprises strontium carbonate or barium carbonate; pre-firing the mixed material to obtain pellets; coarsely crushing the pellets to obtain a coarse powder; mixing the coarse powder, a carbonate, a second iron raw material and water, and then performing wet fine grinding to obtain a slurry; and dehydrating, drying and tempering the slurry to obtain the rubber-plastic ferrite magnetic powder. The chlorine content of the prepared rubber-plastic ferrite magnetic powder is 20-30 ppm; the compact jHc is as high as 4160 Oe, and the rolled plate Br is up to 2650 Gs. The prepared rubber-plastic ferrite magnetic powder is extremely low in chlorine content and has an excellent magnetic property.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a method for preparing rubber-plastic ferrite magnetic powder. Background technique [0002] At present, rubber-plastic ferrite magnetic powder is suitable for compounding with CPE, NBR, nylon and other compounds to prepare bonded magnets through calendering, extrusion molding, and injection molding. It is widely used in micro-motors, advertising magnets, and children's toys. , Refrigerator door seals and many other fields. [0003] In the preparation process of rubber-plastic ferrite magnetic powder in the prior art, since strontium chloride plays a role in fluxing and controlling the growth direction of ferrite grains in the pre-sintering process, the pre-sintering temperature can be reduced and the particle size of the magnetic powder can be controlled. Shape and particle size distribution, generally a certain amount of strontium chloride needs to be added in the m...

Claims

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Application Information

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IPC IPC(8): C01G49/00
CPCC01G49/0036C01P2004/20C01P2004/61C01P2006/42
Inventor 连江滨王兴
Owner ANTE MAGNETIC MATERIAL CO LTD
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