Purification of lanthanum and cerium by plasma arc zone melting

Mimura, Kouji; Sato, Takanori; Isshiki, Minoru

doi:10.1007/s10853-008-2449-9

Cited by 15 publications

(5 citation statements)

References 10 publications

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“…GDMS is an excellent analytical method to determine the very low concentrations of most impurities contained in high-purity metals. [17,[33][34][35] III. RESULTS AND DISCUSSION…”

Section: E Analysis and Elimination Ratiomentioning

confidence: 99%

“…Among the many purification methods for rare earth elements, [15][16][17][18] extraction chromatography using solvent impregnated resins has been used as a separation method of rare earth elements as to new types of ion selective exchangers based on the solvent extraction. [19][20][21][22][23][24] In extraction chromatography, an organic extractant is supported on a suitable porous substrate.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Evaluation of High-Purity La2O3

Lee

Uchikoshi

Mimura

et al. 2010

Metall Mater Trans B

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A separation procedure based on extraction chromatography using the di(2-ethylhexyl) phosphoric acid (D2EHPA) impregnated resin, anion exchange with DIAION SA 10 resin, and oxalate precipitation has been developed for the preparation of high-purity La 2 O 3 in hydrochloric acid media at a high La concentration. The metallic impurities Ce, Pr, Nd, Sm, K, Mg, Ca, Zn, Cu, Co, Mn, Pb, Al, In, and Fe, but not Bi, were removed efficiently from La by extraction chromatography using a D2EHPA impregnated resin. The Bi was separated from the La by anion exchange (DIAION SA 10) separation. Thus, a high-purity LaCl 3 solution was obtained by anion exchange separation and extraction chromatography. La 2 O 3 was prepared from the purified LaCl 3 solution by oxalate precipitation. Glow discharge mass spectrometry was applied for purity evaluation of the prepared La 2 O 3 . The purity of the prepared La 2 O 3 was more than 99.9998 pct total rare earth oxide.

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“…GDMS is an excellent analytical method to determine the very low concentrations of most impurities contained in high-purity metals. [17,[33][34][35] III. RESULTS AND DISCUSSION…”

Section: E Analysis and Elimination Ratiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and Evaluation of High-Purity La2O3

Lee

Uchikoshi

Mimura

et al. 2010

Metall Mater Trans B

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“…In order to achieve excellent purification effect, nearly 20 times of repeated melting of rare earth metals are needed. Moreover, the purification efficiency of zone melting is low, and the single furnace output of rare earth metals is only about 30 g. Therefore, zone melting is only used as the final method to purify small batches of high purity rare earth metals [73,74].…”

Section: Zone Meltingmentioning

confidence: 99%

Research Progress in Preparation and Purification of Rare Earth Metals

Liu

Zhang

Luan

et al. 2020

Metals

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The purity of rare earth metals is one of the most important factors to research and develop high technique materials. However, high purity rare earth metals are not easily achieved. This review summarizes the preparation and purification methods of rare earth metals. First, the preparation principle and process of molten salt electrolysis and metal thermal reduction are introduced. The main sources of metallic impurities and interstitial impurities in rare earth metals as well as the action mechanism of reducing the concentration of different impurities are analyzed and summarized. Then, the purification principle and process of vacuum distillation, arc melting, zone melting, and solid state electromigration are also discussed. Furthermore, the removal effect and function rule of metallic impurities and interstitial impurities in rare earth metals are outlined. Finally, the crucial issues in the development of high purity rare earth metals are put forward, and the development direction of high purity rare earth metals in future are pointed out on this basis.

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“…Commercial pure Gd metal is generally prepared by fusion electrolysis of its fluorides, with further refinement by Electron Beam Melting (EBM) in an inert atmosphere or by distillation in vacuum to obtain the cast metal. Upon distillation, the metallic impurities can be easily removed by evaporation, and their concentrations can be reduced to several mass ppm [6,7]. However, it is of great difficulty to remove the non-metallic impurities, especially oxygen and nitrogen [8,9], because of their strong affinity with Gd.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen in-situ refining method for preparing high purity gadolinium

et al. 2015

Journal of Alloys and Compounds

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Purification of lanthanum and cerium by plasma arc zone melting

Cited by 15 publications

References 10 publications

Preparation and Evaluation of High-Purity La2O3

Preparation and Evaluation of High-Purity La2O3

Research Progress in Preparation and Purification of Rare Earth Metals

Hydrogen in-situ refining method for preparing high purity gadolinium

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