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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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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 particles, the grinding material falling off after the product is finely ground, its particles are fine, the invention patent also mentions that the dispersion of the grinding material particle size is relatively large, usually 0.8-3.8μm, therefore, for this patent The mentioned mixed use process of coarse grinding material and fine grinding material, the practice shows that even if an appropriate amount of dispersant is added, it is difficult to overcome the inhomogeneity of the particle size distribution of the molding slurry

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
Comparison scheme
Effect test

Embodiment 1～5

[0058] Prepare a number of pre-burned materials for Y30H-2 brand, and use jaw crusher for coarse crushing, tube crusher or vibration crushing to further finely crush the waste magnetic tiles of Y30H-2 brand to an average particle size similar to that of pre-fired materials , that is, after 2-5μm, it will be used after the rough grinding of the Y30H-2 brand product.

[0059] The addition amount of main and auxiliary materials is carried out according to Table 5. In addition, according to the mass fraction, 0.5% sorbitol is added as a dispersant. When the WLP-208 Fisher particle size analyzer produced by Dandong Huayu Instrument Co., Ltd. is used to measure the average particle size of the slurry When the material is 0.8μm±0.01μm, the water content of the slurry is controlled at 40% after the material is discharged, and it is molded with a 100T automatic press from Yibin Dazheng Electronics under wet pressure and magnetic field. The molding pressure is 4.5MPa, and the holding tim...

Embodiment 1

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

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

Embodiment 6～9

[0081] Except that the addition amount of the corresponding main and auxiliary materials is carried out according to Table 7, the calculation method of the final auxiliary material addition amount and the rest of the auxiliary materials and process conditions are all carried out according to Example 1, and the obtained relevant data are shown in Table 8.

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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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