Method for recycling permanent ultrafine powder and molding waste of magnet material, and product thereof

A technology of permanent magnet materials and ultrafine powders, which is applied in the fields of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., and can solve problems such as long cycle times, low recovery rates, and potential safety hazards

Inactive Publication Date: 2020-09-11
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is in order to overcome existing RE-FE-B series permanent magnet material such as the superfine powder recycling method that produces in the production process of rare earth neodymium-iron-boron and molding waste (being RE-FE-B series The recycling method of permanent magnet materials such as rare earth NdFeB molding waste has relatively large safety hazards, low recovery rate, large environmental pollution, long cycle, serious loss of rare earth value of NdFeB ultrafine powder, and is not conducive to large-scale production. Due to defects such as large-scale production and excessively high recycling costs, a method for recycling ultrafine powder and molding waste of RE-FE-B series permanent magnet materials (such as rare earth NdFeB) and the recycling method made according to the recycling method are provided. obtained product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1 Recycling method of rare earth NdFeB superfine powder and molding waste

[0048] 1. Rare earth NdFeB superfine powder (composition is 40-50% PrNd, 1-1.5% Dy, 0.3-0.5% Al, 0.2-0.4% Cu, 1-2% Co, 0.1-0.3% Ga, 0.7 -0.9% B, the rest is Fe) in an airtight qualified container, filled with inert gas argon protection, add 0.4wt% alkylphenol polyoxyethylene ether, diethyl malonate and gasoline mixture (based on Common anti-oxidant formula in the field), mixing for 120 minutes.

[0049] The composition is 30.5%-31% PrNd, 0.2-0.4% Al, 0.2-0.3% Cu, 0.5-1% Co, 0.1-0.15% Ga, 0.92-0.97% B, and the rest is Fe molding waste, the percentage Both are mass percentages, under the protection environment of inert gas argon, after crushing and sieving, the molding waste powder with large particle size is obtained; then the rare earth neodymium iron boron ultrafine powder is added to the molding waste.

[0050] 2. The above-mentioned molding waste added with rare earth NdFeB ultr...

Embodiment 2

[0054] The preparation of embodiment 2 sintered NdFeB (ie rare earth NdFeB)

[0055] 1. Add the rare earth NdFeB alloy powder obtained in Example 1 to the formula components 25% PrNd, 2-2.5% Dy, 0.5% Ho, 3% Gd, 0.3-0.4% Al, 0.25 -0.3% Cu, 1.5-2% Co, 0.15% Ga, 0.93-0.99% B, and the rest is Fe, the percentages are all by mass, and the mixture is 240min;

[0056] 2. Press the mixed powder obtained above through an orientation molding press, and the intensity of the orientation magnetic field is > 1.6T;

[0057] 3. The compact obtained above is subjected to isostatic pressing and sintering to form a blank. The sintering process is 1060°C*3h, the second-stage aging is 920°C*3h, and the second-stage aging is 480°C*4h;

[0058] 4. The magnetic properties are detected by PFM pulsed magnetic field magnetometer, Br=12.3KGs, Hcj=25.3KOe, Hk / Hcj=98.3%. The magnetic properties meet the requirements of use.

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Abstract

The invention discloses a method for recycling ultrafine powder and / or molding waste of a Re-Fe-B series permanent magnet material. The method comprises the steps of pressing and sintering the fully mixed ultrafine powder and molding waste, and the ratio of the ultrafine powder to the total mass of the ultrafine powder and the molding waste is less than 50 wt%. The invention further discloses a product prepared through the recycling method, and application of the product. According to the method, the process of recycling the RE-FE-B series permanent magnet material such as ultrafine powder ofrare earth neodymium iron boron and molding waste is integrated, the rare earth value in the ultrafine powder and the molding waste can be well reserved, the ultrafine powder does not need to be combusted and oxidized, potential safety hazards do not exist, the treatment amount of the ultrafine powder and the molding waste is large, the recovery rate is high, no pollution is caused to the environment, the treatment process period is short, the cost is low, and industrial large-scale production is facilitated. When the prepared product is applied to preparation of rare earth neodymium iron boron and other products, good magnetic performance indexes can be kept.

Description

technical field [0001] The invention relates to a recycling method and product of superfine powder of permanent magnet material and molding waste. Background technique [0002] RE-FE-B series permanent magnet material ultrafine powder (such as rare earth NdFeB ultrafine powder) is an ultrafine powder with a particle size D50 of about 1 μm produced during the NdFeB powder metallurgy powder making process, and rare earth NdFeB ultrafine powder The total content of rare earth is about 50%, the activity is very high, and it is easy to be oxidized; these characteristics make the storage and use of ultrafine powder have certain dangers and difficulties. At present, except for a few low-grade products, the ultrafine powder of NdFeB enterprises will be added to the normal powder in a small amount, and in most cases, it will be burned and poured into sludge. In order to save resources and improve the utilization rate of waste resources, it is of great practical significance to recyc...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02C22C38/06C22C38/16C22C38/10B22F3/04B22F9/04B22F3/24
CPCB22F3/04B22F3/24B22F9/04B22F2003/248C22C38/002C22C38/005C22C38/06C22C38/10C22C38/16H01F1/0577H01F41/0266
Inventor兰文辉刘灿岑孔维峰李智翔
OwnerFUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD