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Permanent magnetic ferrite production method and magnetic body thereof

A permanent magnet ferrite and a production method technology, applied in the field of permanent magnet ferrite, can solve the problems of low utilization value and production of high-performance permanent magnet ferrite, and achieve easy popularization and application, improvement of market competitiveness, and simple preparation process Effect

Active Publication Date: 2012-09-26
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the technical problems of low utilization value of recycled permanent magnet ferrite materials and the inability to produce high-performance permanent magnet ferrite with recycled permanent magnet ferrite materials in the prior art, the purpose of the present invention is to provide a recycling method for adding permanent magnet ferrite materials. The method of producing high-performance permanent magnet ferrite materials and its magnets, in order to improve the magnetic properties at a low manufacturing cost, that is, in the production process of the magnets, the waste magnetic powder of the unqualified products in the production process is recycled and reused. It can also maintain good magnetic performance and cost-effective advantages, so that its magnet performance can reach Br≥4400Gs, Hcb≥3250Oe, Hcj≥3500Oe, (BH)max≥4.3MGOe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh the containing Sr 0.8 La 0.2 Fe 11.8 co 0.2 o 19 700kg of permanent magnet ferrite primary pre-fired powder which is the main phase of ferrite and 300kg of recycled permanent magnet ferrite grinder material with the same main phase of the pre-fired material, add 3.5kg SiO 2 , 8.0kg CaCO 3 , 6.0kg calcium gluconate, 2.8kg La 2 o 3 , 2.8kgCo 2 o 3 Put the mixture into a ball mill, add appropriate deionized water as a ball milling medium for grinding, the grinding time is 15 hours, and the average particle size of the slurry after ball milling is 0.75um.

[0039] After wet pulverization, centrifugal dehydration is carried out to the slurry for forming, the concentration of the slurry is adjusted to a solid content of 65wt%, and then formed, while pressing, a forming magnetic field of 10000Gs is applied in the pressing direction. The obtained molded body was a cylinder with a diameter of 43.2 mm and a height of 13 mm, and the molding pressure was 10 MPa.

[00...

Embodiment 2

[0050] Weigh the containing Sr 0.8 La 0.2 Fe 11.8 co 0.2 o 19 600kg of permanent magnet ferrite primary pre-fired powder which is the main phase of ferrite and 400kg of permanent magnet ferrite recycling grinding machine material with the same main phase of the pre-fired material, add 3.0kg SiO 2 , 6.84kg CaCO 3 , 6.0kg of calcium gluconate, 2.4kg of La 2 o 3 , 2.4kgCo 2 o 3 Put the mixture into a ball mill, add appropriate deionized water as a ball milling medium for grinding, the grinding time is 14 hours, and the average particle size of the slurry after ball milling is 0.73um.

[0051] After wet pulverization, centrifugal dehydration is carried out to the slurry for forming, the concentration of the slurry is adjusted to a solid content of 65wt%, and then formed, while pressing, a forming magnetic field of 10000Gs is applied in the pressing direction. The obtained molded body was a cylinder with a diameter of 43.2 mm and a height of 13 mm, and the molding pressure...

Embodiment 3

[0056] Weigh the containing Sr 0.8 La 0.2 Fe 11.8 co 0.2 o 19 750kg of permanent magnet ferrite primary pre-fired powder which is the main phase of ferrite and 250kg of permanent magnet ferrite recycled material grinder material, ball mill leakage and cracking product magnetic powder mixture with the same main phase of the pre-fired material, add 3.0kg SiO 2 , 6.0kg CaCO 3 , 6.0kg calcium gluconate, 2.25kg La 2 o 3 , 1.5kgCo 2 o 3 Put the mixture into a ball mill, add appropriate deionized water as a ball milling medium for grinding, the grinding time is 15 hours, and the average particle size of the slurry after ball milling is 0.75um.

[0057] After wet pulverization, centrifugal dehydration is carried out to the slurry for forming, the concentration of the slurry is adjusted to a solid content of 65wt%, and then formed, while pressing, a forming magnetic field of 10000Gs is applied in the pressing direction. The obtained molded body was a cylinder with a diameter ...

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Abstract

The invention relates to the field of permanent magnetic ferrites, particularly a production method of a permanent magnetic ferrite, which comprises the following steps: after secondarily proportioning permanent magnetic ferrite primary presintering powder and permanent magnetic ferrite reclaimed material, adding secondary additives, preparing a pulp, forming and sintering to obtain the permanent magnetic ferrite material. The invention solves the technical problems of low utilization value of permanent magnetic ferrite reclaimed material and incapability of producing high-performance permanent magnetic ferrite from the permanent magnetic ferrite reclaimed material, implements cyclic utilization of the permanent magnetic ferrite reclaimed material, changes wastes into valuable substances, enhances the utilization ratio of the raw materials, lowers the production cost of the material, and increases the cost performance of the material. The permanent magnetic ferrite magnetic body has the following properties: the residual flux density Br is greater than or equal to 4400Gs, the coercive force Hcb is greater than or equal to 3250Oe, the intrinsic coercive force Hcj is greater than or equal to 3500Oe, and the maximum magnetic energy product (BH)max is greater than or equal to 4.3MGOe.

Description

technical field [0001] The invention relates to the field of permanent ferrite, in particular to a method for producing qualified permanent ferrite magnets through technical improvement by using part of the recycled permanent ferrite as raw materials. Background technique [0002] According to statistics, in the preparation and production process of permanent magnet ferrite, there are 10 to 15% of unqualified products (such as cracking, falling corners, etc.), and there are also material leakage during ball milling and molding and grinding during grinding. The grinder material produced in the process, in addition to waste household appliances and waste electrical appliances, there are also a large number of waste magnets. Here collectively referred to as permanent magnet ferrite recycled materials. At present, for the above-mentioned materials, most manufacturers simply recycle them and then sell them at a low price. Some even dispose of them as garbage, causing serious was...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 丁伯明韦晓阳樊良军杨武国胡良权叶华姚淦
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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