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Neodymium Metal: Oxide Reduced by Graphite in Vacuum, Distilled at 1900 °C onto Tantalum (Downing, Union Carbide, US 3,104,970)
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Charlie

31. Oktoba 2026DE
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Neodymium Metal: Oxide Reduced by Graphite in Vacuum, Distilled at 1900 °C onto Tantalum (Downing, Union Carbide, US 3,104,970)

Carbon cannot pull neodymium out of its oxide in an ordinary furnace. In a hard vacuum it can: the oxide and graphite turn into neodymium carbide, and at 1900 °C the neodymium itself boils off and condenses as metal on a cool tantalum plate. Result: neodymium metal, 99.21 % Nd and 0.83 % carbon in Union Carbide's run. Source: Downing, Gorski and Koerner, US 3,104,970 (Union Carbide, 1963), Example II. That example starts from a samarium-neodymium mixture; using it for pure neodymium oxide is ours. Picture drawn by Youblob.
Juu
2 days

Maagizo

1

Mix with graphite and pelletise

Mix the oxide intimately with powdered graphite (Example II: 78 % oxides to 22 % graphite by weight, 1.8 % carbon over theory; the patent allows 1-15 %, prefers 5-10 %), particles under about 50 microns, and press into 0.75 in pellets.

Vifaa kwa hatua hii:

Oksidi ya neodimiamuOksidi ya neodimiamu78 parts
Unga wa GrafitiUnga wa Grafiti22 parts

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Mashine ya kubana vidongeMashine ya kubana vidonge
2

Reduce in vacuum to the carbide

Heat the pellets in a vacuum induction furnace at 0.15 micron for about 8 hours. The example's temperature is printed "1700-1700 °C"; claim 5 gives about 1920 °C for about 16 hours. Volatile matter goes to a graphite condenser; the neodymium stays behind as carbide.

Zana zinazohitajika:

Tanuru la uingizajiTanuru la uingizaji
Pampu ya utupuPampu ya utupu
Kalibu ya grafitiKalibu ya grafiti
3

Purge at 1600 °C

Reheat the carbide residue in a carbon crucible at 1600 °C and 0.05 micron for 1 hour (in the example this drove off the last samarium). The residue is substantially pure neodymium carbide.

Zana zinazohitajika:

Tanuru la uingizajiTanuru la uingizaji
Pampu ya utupuPampu ya utupu
Kalibu ya grafitiKalibu ya grafiti
4

Distil the metal at 1900 °C onto tantalum

Heat it in a graphite crucible to 1900 °C at 0.05 micron for 3 hours. Neodymium boils off and condenses on a tantalum plate, which barely alloys with it: 99.21 % neodymium, 0.83 % carbon.

Zana zinazohitajika:

Tanuru la uingizajiTanuru la uingizaji
Pampu ya utupuPampu ya utupu
Kalibu ya grafitiKalibu ya grafiti
Bamba la kipozaji la tantalamuBamba la kipozaji la tantalamu

Vifaa

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Zana Zinazohitajika

6

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Metali ya neodimiamu

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Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Neodymium Oxide: Rare Earths Separated into Coloured Bands on a Bleached Resin Column (Jaffe, US 2,897,050)
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Neodymium Oxide: Rare Earths Separated into Coloured Bands on a Bleached Resin Column (Jaffe, US 2,897,050)

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