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Method for regenerating scrap magnets

A technology of magnets and sintered magnets, applied in the direction of magnetic objects, permanent magnet manufacturing, magnetic materials, etc., can solve the problems of low productivity and high cost, and achieve the effects of increasing productivity, reducing costs, and reducing production equipment

Inactive Publication Date: 2011-01-19
ULVAC INC
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Problems solved by technology

[0009] However, as mentioned above, any existing technology regenerates spent magnets through multiple treatment processes such as solvent extraction, so productivity is low, and there is a problem of high cost due to the use of several solvents such as hydrogen fluoride

Method used

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  • Method for regenerating scrap magnets
  • Method for regenerating scrap magnets
  • Method for regenerating scrap magnets

Examples

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Embodiment 1

[0057] In Example 1, waste magnets used in hybrid vehicles were recovered to produce regenerated magnets. The scrap magnet is made from industrial pure iron, metal neodymium, low-carbon iron boron and metal cobalt according to the proportion (% by weight) of 23Nd-6Dy-1Co-0.1Cu-0.1B-remainder Fe. In addition, since the recovered waste magnets are subjected to surface treatment such as Ni plating, the surface treatment layer (protective film) is peeled off using a known release agent and washed. Then, the waste product is pulverized into about 5 mm to obtain recycled raw materials.

[0058] In addition, with industrial pure iron, metal neodymium, and low-carbon iron-boron as the main raw materials, according to the proportion of 24(Nd+Pr)-6Dy-1Co-0.1Cu-0.1Hf-0.1Ga-0.98B-remainder Fe ( % by weight), vacuum induction melting was carried out, and a flaky ingot (melting raw material) with a thickness of about 0.4 mm was obtained by strip casting.

[0059] Next, the recovered raw m...

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Abstract

In an example of a conventional method, the regeneration of sintered magnets is achieved by means of a number of processes involving solvent extraction etc. As a result, productivity is poor and, since a number of solvents such as hydrofluoric acid and the like are used, the cost is high. The present method includes the following steps: a step in which scrap iron - boron - rare earth sintered magnets are recovered and pulverized and recovered raw material powder is obtained; a step in which a sintered compact is obtained from said recovered raw material powder using a powder metallurgical method and a step in which said sintered compact is arranged in a treatment chamber and heated, and a material for metal vaporization purposes containing at least one of Dy and Tb which is arranged in the same or another treatment chamber is vaporized, and vaporized metal atoms are deposited on the sintered magnet surface while the amount of said atoms which are being supplied is controlled, and the deposited metal atoms are diffused into the crystal grain boundaries and / or crystal grain boundary phase of the sintered compact.

Description

technical field [0001] The present invention relates to a method for regenerating waste magnets, in particular to a method for recovering used or waste sintered magnets in the manufacturing process, and regenerating sintered magnets with high magnetic characteristics without dissolving and extracting specific elements from the sintered magnets. A method for regenerating waste magnets of magnets (permanent magnets). Background technique [0002] Because the sintered magnets of the Nd-Fe-B system (so-called neodymium magnets) are composed of iron and cheap, abundant resources and stable supply of Nd and B elements, they can be manufactured at low cost and have high magnetic properties. characteristics (the maximum energy product is about 10 times that of ferrite magnets), so it is used in various products such as electronic equipment, and it is adopted in motors and generators for hybrid vehicles, and its usage is increasing. [0003] The above-mentioned sintered magnets are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02B22F3/24B22F8/00B22F9/04C22C33/02C22C38/00H01F41/00
CPCH01F1/0577B22F2003/241B22F8/00C23C10/06H01F41/026C23C14/16B22F9/04C23C14/5806B22F2998/10B22F3/24H01F41/0293C22C2202/02B22F2003/248C22C33/0278Y02W30/50B22F3/10Y02P10/20
Inventor 永田浩新垣良宪
Owner ULVAC INC
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