A kind of method of recycling permanent magnet ferrite waste

A technology for recycling permanent ferrite and waste materials, which is applied in the direction of magnetism of inorganic materials, can solve problems such as inhomogeneous particle size distribution of slurry for molding, large particle size dispersion of grinding materials, and decreased mechanical strength, etc. Excellent mechanical strength, low cost, and good consistency of magnetic properties

Active Publication Date: 2018-03-09
自贡市江阳磁材有限责任公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this process: (1) The grinding material is directly recycled, and the mechanical strength of the product is significantly reduced. (2) In the further grinding stage, detergent is added. The detergent often contains some ingredients that are harmful to the performance of permanent magnet ferrite products. In order to remove the excess water in the filter slurry, the method of natural water filtration is adopted, which may easily cause some harmful impurities to enter the product. Cutting material, coarse p

Method used

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  • A kind of method of recycling permanent magnet ferrite waste
  • A kind of method of recycling permanent magnet ferrite waste
  • A kind of method of recycling permanent magnet ferrite waste

Examples

Experimental program
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Example

[0057] Examples 1 to 5

[0058] Prepare some pre-sintered materials for Y30H-2, and use jaw crusher, tubular crusher or vibrating crusher to further finely smash the waste magnetic tiles of Y30H-2 to an average particle size similar to the pre-sintered material. , that is, after 2 to 5 μm, it will be used later, and the grinding material falling off during rough grinding of the Y30H-2 product will be used after magnetic separation and impurity removal treatment.

[0059] The addition amount of the main and auxiliary materials is carried out according to Table 5, and 0.5% of sorbitol is added as a dispersant according to the mass fraction. When the material is 0.8μm±0.01μm, the material is discharged. After the material is discharged, the moisture content of the slurry is controlled at 40%, and it is formed by wet magnetic field pressing with Yibin Dazheng Electron 100T automatic press. The forming pressure is 4.5MPa, and the pressure holding time is 6 seconds. The magnetizing...

Example Embodiment

[0072] The load-bearing test curve of the product obtained in Example 1 is as follows figure 2 shown.

[0073] The ultimate bearing load of the product obtained in Example 1 is 286kgf.

Example

[0074] Comparative Examples 1 to 4

[0075] Prepare some rough grinding materials that are not removed and set aside for use. In addition, the main and auxiliary materials are implemented according to Table 5, and the rest are implemented according to Implementation 1. The obtained products, the typical data of parameters such as qualified rate, product magnetic properties, porosity and load bearing limit are shown in Table 6.

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Abstract

A method for recycling permanent magnet ferrite waste, which is characterized in that it includes the following steps: placing waste magnetic tiles in grades according to different grades, first coarsely crushing them, and then further finely crushing them until the waste magnetic tiles with an average particle size of 2-5 μm are obtained. The magnetic tile materials are recycled according to different grades; the pre-fired materials are mixed with the waste magnetic tile materials, and enter the fine crushing stage; Recycling after magnetic separation and impurity removal treatment, adding additives in the fine crushing stage; and then preparing permanent magnet ferrite according to the conventional permanent magnet ferrite preparation process. The invention can obtain the permanent magnet ferrite with lower cost, higher qualified rate of products, good consistency of magnetic properties and excellent mechanical strength of products.

Description

technical field [0001] The invention relates to a method for manufacturing permanent ferrite, in particular to a method for recycling permanent ferrite waste. Background technique [0002] Permanent magnet ferrite is made of ferric oxide as the main raw material through ceramic technology. It has the characteristics of strong anti-demagnetization ability, high residual magnetic induction intensity and good chemical stability. It is a kind of high cost performance and application The permanent magnet material with the widest range and the largest demand. It is widely used in automobiles, household appliances, industrial automation and other industries. Known hexagonal M-type (magnetoplumbite type) Sr ferrite or Ba ferrite, its traditional production process includes pre-calcination, coarse crushing, fine crushing, molding, sintering, grinding, cleaning, testing , packaging and other production links. The sintering process often leads to the appearance of waste magnetic til...

Claims

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Application Information

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IPC IPC(8): H01F1/10C04B35/26C04B35/622
Inventor 王自敏邓志刚刘力朱泽贤
Owner 自贡市江阳磁材有限责任公司
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