WO/2004/101202 is referenced by 5 patents.

(EN) A method for recycling a rare earth-transition metal based scrap comprised of at least one of a failed article or an unwanted residue not constituting a product generated on the way of the production of a rare earth magnet or a hydrogen occluding alloy and a waste recovered from an used product having a rare earth magnet or a hydrogen occluding alloy, characterized in that it comprises subjecting the scrap to a heat treatment in an oxygen-containing atmosphere, to thereby carry out a disproportionation reaction, wherein the scrap is decomposed and fine transition metal based magnetic particles having a transition metal content higher than that of a rare earth-transition metal based inter-metallic compound as the main component of the scrap and having an average particle diameter of 500 nm or less and rare earth oxide particles mainly containing the remaining rare earth metal and having an average particle diameter of 500 nm or less are formed separately, and regenerate the scrap as a magnetic powder for absorbing a radio wave comprising a composite of fine transition metal based magnetic particles and a rare earth oxide. The method allows a rare earth-transition metal based scrap generating associated with the production or disposal of a rare earth magnet or a hydrogen occluding alloy to be effectively recycled at a low cost over the framework of regeneration to the same type of material.(JA) 希土類磁石、水素吸蔵合金の製造途上にて生ずる不良品又は製品を構成しない不要残留物、及び希土類磁石又は水素吸蔵合金を装着した使用済み製品から回収される廃棄品の少なくともいずれかにて構成された希土類−遷移金属系スクラップを、酸素含有雰囲気中にて熱処理する。その酸化反応に基づいて、スクラップの主体をなす希土類−遷移金属系金属間化合物よりも遷移金属の含有率が高い平均粒径500nm以下の遷移金属系磁性微粒子と余剰となった希土類金属から主としてなる同様に平均粒径500nm以下の希土類酸化物粒子とを分解により遊離生成する不均化反応処理を行う。これにより、スクラップを遷移金属系金属微粒子と希土類酸化物との複合体からなる電波吸収用磁性体粉末として再生する。希土類磁石や水素吸蔵合金の製造ないし廃棄に伴い発生する希土類−遷移金属系スクラップを、同種材料への再生という枠を超えて安価にかつ有効にリサイクルすることができる。

Title
(Ja) 希土類-遷移金属系スクラップのリサイクル方法、電波吸収用磁性体粉末及びそれを用いた電波吸収体
(En) Method for recycling rare earth-transition metal based scrap, magnetic powder for absorbing radio wave and radio wave absorbing material using the same
Application Number
PCT/JP2004/007029
Publication Number
2004/101202
Application Date
May 18, 2004
Publication Date
November 25, 2004
Inventor
Itoh Masahiro
Machida Ken Ichi
Agent
SUGAWARA Masatsune
Assignee
Itoh Masahiro
Machida Ken Ichi
Santoku Corporation
IPC
H01F 41/02
H01F 01/09
H01F 01/33
C22B 07/00
C22B 59/00
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