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Recycling and preparing method of permanent magnetic ferrite and magnet thereof

A technology of permanent magnet ferrite and magnet, applied in the field of permanent magnet ferrite, can solve the problems of producing high-performance permanent magnet ferrite, increasing the utilization rate of rare earth resources, low utilization value, etc. The effect of simple preparation process

Inactive Publication Date: 2014-11-12
梁家新
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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 method for recycling permanent magnet ferrite materials. The method for producing high-performance permanent magnet ferrite material and its magnet, increase the utilization rate of rare earth resources, so that the magnet performance can reach Br≥5100Gs, H cb ≥4310Oe,H cj ≥3700Oe, (BH) max ≥4.9MGOe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh the Sr 0.6 La 0.1 Fe 11.6 Co 0.1 O 18 The primary phase of the ferrite ferrite primary pre-fired powder 800kg and the permanent ferrite recovery material with the same primary phase of the pre-fired material 200kg, add 2kg SiO 2 , 9kg CaCO 3 , 30kg of pyridine, 3kg of La 2 O 3 , 9kgCo 2 O 3 The mixture is put into a ball mill, and then appropriate deionized water is added as a ball milling medium for grinding. The grinding time is 20 hours, and the average particle size of the slurry after ball milling is 8 μm.

[0041] After wet pulverization, the slurry for molding is subjected to centrifugal dewatering, the concentration of the slurry is adjusted to a solid content of 75 wt%, and then the molding is performed. While pressing, a molding magnetic field of 4000 Gs is applied in the pressing direction. The obtained molded body is a cylinder with a diameter of 42 mm and a height of 12 mm, and the molding pressure is 12 MPa.

[0042] The molded body is heat-treated at a te...

Embodiment 2

[0044] Weigh the Sr 0.6 La 0.1 Fe 11.6 Co 0.1 O 18 The main phase of the ferrite ferrite primary pre-fired powder 700kg and the permanent ferrite recovery material with the same main phase of the pre-fired material 300kg, add 3kg SiO 2 , 8kgCaCO 3 , 25kg of pyridine, 3kg of La 2 O 3 , 9kgCo 2 O 3 Put the mixture into a ball mill, and then add appropriate deionized water as the ball milling medium for grinding. The grinding time is 20 hours. The average particle size of the slurry after ball milling is 7um.

[0045] After wet pulverization, the slurry for molding is subjected to centrifugal dewatering, the concentration of the slurry is adjusted to a solid content of 78 wt%, and then the molding is performed. While pressing, a molding magnetic field of 5000 Gs is applied in the pressing direction. The obtained molded body is a cylinder with a diameter of 42 mm and a height of 12 mm, and the molding pressure is 12 MPa.

[0046] The molded body is heat-treated at a temperature of 250°C...

Embodiment 3

[0048] Weigh the Sr 0.6 La 0.1 Fe 11.6 Co 0.1 O 18 750kg of primary pre-fired powder of permanent ferrite, which is the main phase of ferrite, and 250kg of magnetic powder mixture of permanent ferrite recovery material with the same main phase of the pre-fired material, grinding material, ball mill leakage and cracked products, and 3kg of SiO 2 , 8kgCaCO 3 , 25kg of pyridine, 3kg of La 2 O 3 , 9kgCo 2 O 3 The mixture is put into a ball mill, and then appropriate deionized water is added as the ball milling medium for grinding. The grinding time is 20 hours, and the average particle size of the slurry after ball milling is 6um.

[0049] After wet pulverization, the slurry for molding is centrifuged and dehydrated, the slurry concentration is adjusted to a solid content of 73% by weight, and then the molding is performed. While pressing, a molding magnetic field of 3000 Gs is applied in the pressing direction. The obtained molded body is a cylinder with a diameter of 42 mm and a heig...

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Abstract

The invention provides a recycling and preparing method of a permanent magnetic ferrite. The preparing method includes the following steps of (a) preparing materials for the second time, wherein a mixture composed of 70-90 wt% of permanent magnetic ferrite primary pre-sintering material powder and 10-30 wt% of permanent magnetic oxygen recycling materials is weighed in a mass mode; (b) carrying out secondary additive preparation, wherein the following compounds of La2O3, SiO2, Co2O3, CaCO3 and a surface active agent are added by mass according to the total quantity of primary pre-sintering materials; (c) preparing slurry, wherein the mixtures obtained in the step (a) and in the step (b) are continuously ground in a ball mill in a wet milling mode, and a molding spare slurry with the content of 70-80 wt% is formed through concentration; (d) carrying out forming and sintering, wherein the slurry obtained from the preceding steps is added into a mould for magnetic field forming, the intensity of a forming magnetic field is 2000G-6000s, and the slurry is sintered in an electric kiln.

Description

Technical field [0001] The invention relates to the field of permanent ferrites, in particular to a method for producing qualified permanent ferrite magnets through technical improvements using part of the permanent ferrite recycled materials as raw materials. Background technique [0002] According to statistics, in the preparation and production process of permanent ferrite, there are 5-20% of unqualified products (such as cracks, corners, etc.). In addition, there are leakages in the process of high-speed ball milling and sintering and grinding There are also a large number of waste magnets in the grinding machine materials produced in the process, as well as waste electrical appliances and waste electrical appliances. These are collectively referred to as permanent ferrite recovery materials. [0003] At present, most manufacturers dispose of the above materials as garbage, causing serious waste of resources and environmental pollution. Even if some of them are recycled, they ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 梁家新陈刚
Owner 梁家新
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