Rare earth permanent magnet material recycled from waste and preparation method thereof

A rare earth permanent magnet and permanent magnet material technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of insufficient material coercivity, and achieve the effects of improving magnetic properties, reducing costs, and high social value

Active Publication Date: 2018-12-11
XUZHOU NANFANG YONGCI MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coercive force of the material prepared by this method is not high enough.

Method used

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  • Rare earth permanent magnet material recycled from waste and preparation method thereof
  • Rare earth permanent magnet material recycled from waste and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of the waste recycling rare earth permanent magnet material of the present invention comprises the following steps:

[0037] 1) Waste disposal:

[0038] a) Put the phosphor waste material in a roasting furnace for pretreatment at 620°C for 2 hours, and then ball mill it to 20-80 microns to obtain roasted phosphor powder waste; mix the treated phosphor waste material with Na 2 O mixed, high temperature alkali fusion treatment at 700°C for 3 hours to obtain the alkali fusion reaction product, in which Na 2 The mass ratio of O to the roasted fluorescent powder waste is 4:1.5; add 8 mol / L (concentration can be 6-10 mol / L) hydrochloric acid to the obtained alkali fusion reaction product, the mass ratio of alkali fusion reaction product to hydrochloric acid The ratio is 1:1; put the prepared mixed solution into a constant temperature water bath at 65°C and heat it for 2 h, then filter to obtain a leachate containing rare earth elements; take 130g / L oxa...

Embodiment 2

[0049] The preparation method of the waste recycling rare earth permanent magnet material of the present invention comprises the following steps:

[0050] 1) Waste disposal:

[0051] a) Put phosphor powder waste in a roasting furnace for pretreatment at 550° C. for 1 hour, and then ball mill to 20-80 microns to obtain roasted phosphor waste; mix the treated phosphor waste with Na 2 O mixed, high temperature alkali fusion treatment at 690°C for 2 hours to obtain alkali fusion reaction product, in which Na 2 The mass ratio of O to the roasted fluorescent powder waste was 4:1; 6mol / L hydrochloric acid was added to the resulting alkali fusion reaction product, and the mass ratio of the alkali fusion reaction product to hydrochloric acid was 1:1; Put it in a 65°C constant temperature water bath and heat it for 2 hours, then filter to obtain a leach solution containing rare earth elements; mix 125g / L oxalic acid solution with the leach solution to precipitate compounds, and the amo...

Embodiment 3

[0062] In this example, the mixed rare earth permanent magnet material alloy ingot: according to the following mass percentage ingredients: Nd 20%, Y8%, Eu4%, Dy 4%, B4%, P 0.3%, Ag 0.175%, Ni 0.5%, Si 0.025%, Ti 0.5%, the rest is Fe. All the other conditions and preparation process are the same as in Example 1. The mass percent content of N in the treated material is 0.050%.

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Abstract

The invention provides a rare earth permanent magnet material utilizing recycled waste materials. An alloy material is high in coercivity. The preparation method is simple in process, low in production cost and suitable for industrial production. The permanent magnet material comprises the following components in percentage by mass: 18-22% of Nd, 7.2-8.8% of Y, 3.6-4.4% of Eu, 3.6-4.4% of Dy, 2-6% of B, 0.1-0.5% of P, 0.15-0.20% of Ag, 0.45-0.60% of Ni, 0.01-0.04% of Si, 0.45-0.60% of Ti and the balance of Fe; the mass ratio of Nd to Y to Eu to Dy in the permanent magnet material is 10:4:2:2; and the permanent magnet material also comprises 0.045-0.060% of N in percentage by mass.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a rare earth permanent magnet material recycled from scraps and a preparation method thereof. Background technique [0002] CN201410725480.8 application relates to a preparation method of rare earth permanent magnet material, the preparation method includes the following steps: respectively provide Re-Fe-B quenching powder and Ce-based quenching powder, wherein the Re-Fe-B quenching The rare earth Re in the powder is one or more of Nd, Pr, Dy, Tb, and the chemical formula of the Ce-based quenching powder is Ce x Fe (100-x-y-z) B y m z , M is selected from one or more of Ga, Co, Al, Zn, Cu, Nb and Zr, x, y and z are the mass percentages of the corresponding elements, and 28%≤x≤35%, 0.8% ≤y≤1.5%, 0%≤z≤2%; uniformly mix the Ce-based quenching powder with the Re-Fe-B quenching powder to obtain a mixed magnetic powder, wherein the Ce in the mixed magnetic powder The mass percentage o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/059C22C38/08C22C38/02C22C38/14
CPCC22C38/001C22C38/005C22C38/007C22C38/02C22C38/08C22C38/14C22C38/32H01F1/0575H01F1/059
Inventor 张作州
Owner XUZHOU NANFANG YONGCI MATERIAL
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