Extraction of Sm from Sm–Fe alloys by the glass slag method

Extraction of Sm from Sm–Fe–N magnets by the glass slag method

“…We have reported that Sm-Co alloys can be separated into Sm-containing boron trioxide and a Co-B alloy and that Sm-Fe alloys can be separated into Sm-containing boron trioxide and an Fe-B alloy by the glass slag method [9,10]. Unlike the Sm-Fe alloys, Sm-Fe-N alloy was separated into Sm-containing boron trioxide and an Fe metal by the glass slag method.…”

“…Several attempts have been made to recycle rare-earth permanent magnet materials [3][4][5][6][7]. We have been studying for a dry recycling process, the so-called glass slag method, and have succeeded in the recovery of Nd from Nd-Fe-B alloys and Sm from Sm-Co and Sm-Fe alloys by this method [8][9][10].…”

Challenges and opportunities for sustainable valorization of rare earth metals from anthropogenic waste

“…From the Nd bearing slag, recovery of Nd through sequential sulfuric acid leaching followed by precipitation using sodium sulfate has been proposed (Saito et al 2003 , 2006 ) . The same author also reported Sm recovery from Sm–Co magnets through glass slag formation with 99% efficacy (Tetsuji Saito et al 2003 ; Saito et al 2005 ). Takeda et al have reported a scrap-to-scrap integration recovery process where Nd was recovered from NdFeB magnet through alloying with Mg at high temperature followed by hydrothermal treatment (Takeda et al 2006 ) .…”

High Temperature Phase Relations of the Nd₂O₃-Na₂B₄O₇ Pseudo Binary System and Their Application to Recycling of Neodymium Magnets

“…Ag などの溶融金属を溶媒として用いて希土類元素を抽出す る方法 [26][27][28][29][30] などが報告されている．また，磁石中の希土類元 素を溶融酸化物 (スラグ) として回収する方法として，希土類 酸化物のフラックスとして B 2 O 3 を用いる方法 [31][32][33][34][35][36][37][38] や，CaO-…”