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A kind of preparation method of high-performance permanent magnet ferrite magnetic powder

A permanent magnet ferrite, high-performance technology, applied in the direction of inductance/transformer/magnet manufacturing, inorganic material magnetism, electrical components, etc., can solve the problems of permanent magnet ferrite reduction in residual magnetism, inability to improve the comprehensive performance of magnets, etc., to achieve high Remanence, the effect of improving overall performance

Active Publication Date: 2022-02-18
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is to overcome the method of adding calcium carbonate, silicon dioxide and other additives in the ball milling stage during the preparation of magnetic powder in the prior art. Although it can effectively improve the intrinsic coercive force of permanent ferrite, it will also cause permanent magnet The remanent magnetism of ferrite is obviously reduced, and the comprehensive performance of the magnet cannot be effectively improved. A preparation method of high-performance permanent ferrite magnetic powder is provided, and clinker pre-calcined powder is added together with calcium carbonate and silicon dioxide as additives. Permanent magnet ferrite with high remanence, intrinsic coercive force and maximum energy product can be obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Method for preparing high performance permanent magnetic ferrite magnetic powder, including the steps of:

[0040] (1) Ball mill: 320 kg of iron oxide red and 80 kg of carbonate is added to the ball mill, and 1600 g of calcium carbonate, 400 g of silica and 40 g of clinker pre-burning powder, mixed ball milling for 90min, resulting in mixed material paste;

[0041] (2) Drying: After drying the mixture slurry at 100 ° C for 20 h, it obtains a permanent magnet ferrite.

[0042] (3) Pre-feeding: Put the permanent magnetite raw material into the box furnace, temperature rise to 1230 ° C at the rate of 2 ° C / min, and prepare 60 min to obtain pre-bonded;

[0043] (4) Crushing: The pre-boke drying is pulverized to an average particle size of 7 μm to obtain the high-performance permanent magnetite magnetic powder.

[0044] Among them, the preparation method of clinker pre-burning powder is:

[0045] A) Raw material fine mill: dry the iron scale by drying kiln, drying at 120 ° C, ...

Embodiment 2

[0051] Method for preparing high performance permanent magnetic ferrite magnetic powder, including the steps of:

[0052] (1) Ball mills: 300 kg of iron oxide red and 100 kg of barium carbonate is added to the ball mill, and 800 g of calcium carbonate, 1600 g of silica and 80 g of pre-burning powder, mixed ball milling for 80min, resulting in a mixture slurry;

[0053] (2) Dry: After drying at 90 ° C for 24 hours, the permanent magnetite is obtained;

[0054] (3) Pre-feeding: Put the permanent magnetite raw material into the box furnace, temperature rise to 1220 ° C at the rate of 1 ° C / min, and prepare 65 min to give pre-bonded;

[0055] (4) Crushing: The pre-bonded drying is pulverized to a average particle size of 4 μm to obtain the high performance permanent magnetite magnetic powder.

[0056] Among them, the preparation method of clinker pre-burning powder is:

[0057] A) Raw material fine mill: dry the iron scale by drying kiln, drying at 115 ° C, so that the iron scale moi...

Embodiment 3

[0063] Method for preparing high performance permanent magnetic ferrite magnetic powder, including the steps of:

[0064] (1) Ball mill: 340 kg of iron oxide red with 60 kg of bone is added to the ball mill, and 1200 g of calcium carbonate, 800 g of silica and 200 g of pre-burning powder, mixed ball milling for 100 minutes, resulting in mixed material pulping;

[0065] (2) Drying: After drying the mixture slurry at 110 ° C for 18 h, the permanent magnetite is obtained;

[0066] (3) Pre-feeding: Put the permanent magnetite raw material into the box furnace, warmed up to 1240 ° C at a rate of 3 ° C / min, and prepared for 55 min to give pre-bonded;

[0067] (4) Crushing: The pre-boke drying is pulverized to an average particle size of 7 μm to obtain the high-performance permanent magnetite magnetic powder.

[0068] Among them, the preparation method of clinker pre-burning powder is:

[0069] A) Fine milling: Make the iron scale by drying kiln, drying at 125 ° C, so that the iron sca...

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Abstract

The invention discloses a method for preparing a high-performance permanent ferrite magnetic powder. The steps are: (1) ball milling: the main material and additives are mixed and ball milled to obtain a mixture slurry, and the main material includes 75 to 85 % iron oxide red and 15-25% barium carbonate; the additives include calcium carbonate, silicon dioxide and clinker pre-burnt powder; (2) drying: dry the mixture slurry to obtain permanent ferrite raw (3) Pre-calcination: Pre-calcined permanent magnet ferrite raw materials are obtained after pre-calcination; (4) Crushing: The high-performance permanent magnet ferrite magnetic powder is obtained after dry-type crushing of pre-calcined materials. The present invention adds clinker calcined powder together with calcium carbonate and silicon dioxide as additives to obtain permanent magnet ferrite with high remanence, intrinsic coercive force and maximum magnetic energy product.

Description

Technical field [0001] The present invention relates to the preparation of magnetic materials, in particular, to a method of preparing a high performance permanent magnetite magnetic powder. Background technique [0002] Permanent magnetite is also known as a hard magnetic ferrite, which has characteristics that continue to maintain constant magnetic fields or magnets after magnetization, is an important magnetic material, which can be widely used in automotive DC motor, start motors, inductor, audio Many applications such as the converter, separator. With the development of technology, more equipment requires more miniatur, lightweight, energy saving, and high efficiency, permanent magnet ferrite as an important permanent magnet material in many equipment, and makes a more demanding requirement. [0003] The measurement indicators of permanent magnetite properties mainly include residual magnetic (BR), magnetic induction (HCB), internal coercive force (HCJ) and maximum magnetic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/626H01F41/02H01F1/11
CPCC04B35/2683C04B35/626C04B35/6261C04B35/62695C04B35/62605H01F41/0253H01F1/11C04B2235/3215C04B2235/3208C04B2235/3418C04B2235/3213
Inventor 杨晨
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD