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

Saito, Tetsuji; Sato, Hiroo; Motegi, Tetsuichi; Kobayashi, Kurima

doi:10.1016/j.jallcom.2005.05.029

Cited by 12 publications

(2 citation statements)

References 12 publications

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“…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-…”

Section: A D V a N C E V I E Wunclassified

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

Wada

Arai

Ogawa

et al. 2021

J. Japan Inst. Metals and Materials

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A high temperature recycling process of neodymium magnets using B 2 O 3 flux has been reported. However, the B 2 O 3 flux shows a poor fluidity of the slag. For this purpose of solving the problem, present work considers the use of Na 2 B 4 O 7 with lower viscosity than the B 2 O 3 flux.The phase equilibria for the Nd 2 O 3 -Na 2 B 4 O 7 pseudo binary system was investigated in the temperature range from 1460 K to 1780 K. We found that this pseudo-binary system forms the homogeneous melt in the concentration range of from 16 mass％Na 2 B 4 O 7 to 20 mass％Na 2 B 4 O 7 and over 55 mass％ Na 2 B 4 O 7 at 1673 K. Based on the determined this diagram, the feasibility study of the recycling process of the neodymium magnets using Na 2 B 4 O 7 flux was carried out 20 kg and 100 kg high frequency induction furnace. When neodymium magnets and an EV rotor were melted with Na 2 B 4 O 7 in a carbon crucible, the rare earth elements of Nd, Pr, Dy and Tb in the magnets and rotor were enriched to the Na 2 B 4 O 7 slag phase and the iron in the magnets and the rotor were contributed to the Fe-C alloy phase. The oxalate precipitation method was used for the recovered Nd 2 O 3 -Na 2 B 4 O 7 slag, more 99 mass％ purity ratio of RE x O y was recovered.

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Section: A D V a N C E V I E Wunclassified

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

Wada

Arai

Ogawa

et al. 2021

J. Japan Inst. Metals and Materials

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“…[16,17] Mixed rare earth compounds were converted into halides, and then separated according to the differences in the vapor pressure of species with different oxidation states. Other proposed processes involve rare earth oxidation by molten slag phase, [18][19][20][21][22] molten salt electrolysis, [23][24][25] and selective chlorination. [26,27] Some of these techniques are feasible for ''in-process'' (or ''in-house'') magnet scrap, or scrap supplied by a certain production route with a defined composition.…”

Section: Selective Chlorinationmentioning

confidence: 99%

Selective Extraction and Recovery of Nd and Dy from Nd-Fe-B Magnet Scrap by Utilizing Molten MgCl2

Shirayama

Okabe

2018

Metall Mater Trans B

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SAKAE SHIRAYAMA and TORU H. OKABE Fundamental experiments are conducted with the aim of developing an efficient recycling process for rare earth elements (REEs) from neodymium-iron-boron (Nd-Fe-B) permanent magnet scrap. Molten magnesium dichloride (MgCl 2) was chosen as an extraction medium, which can selectively chlorinate and extract REEs in magnet alloys. Dysprosium-containing Nd-Fe-B magnet alloy was immersed in molten MgCl 2 at 1273 K (1000°C) for 3 to 12 hours. The results of the experiments clearly show that the REEs in the magnetic alloy were successfully extracted into the molten salt, while the Fe-B alloy remained in a solid form. The extraction ratios of Nd and Dy were at most 87 and 78 mass pct, respectively. After the extraction experiment, excess MgCl 2 and Mg were removed by vacuum distillation and the rare earth chlorides were recovered. Thus, the feasibility of this method for efficient recovery of rare earths using molten MgCl 2 is demonstrated.

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Selective Chlorination of Rare Earth Elements from a Nd-Fe-B Magnet Using Zinc Chloride

Lim

Choi

Moon³

et al. 2021

J. Sustain. Metall.

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

Cited by 12 publications

References 12 publications

High Temperature Phase Relations of the Nd<sub>2</sub>O<sub>3</sub>-Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub> Pseudo Binary System and Their Application to Recycling of Neodymium Magnets

High Temperature Phase Relations of the Nd<sub>2</sub>O<sub>3</sub>-Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub> Pseudo Binary System and Their Application to Recycling of Neodymium Magnets

Selective Extraction and Recovery of Nd and Dy from Nd-Fe-B Magnet Scrap by Utilizing Molten MgCl2

Selective Chlorination of Rare Earth Elements from a Nd-Fe-B Magnet Using Zinc Chloride

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