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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.
高级
2 days
说明
1
1
Mix with graphite and pelletise
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.
此步骤所需材料：
氧化钕78 parts
石墨粉22 parts所需工具：
等臂天平
压丸机2
2
Reduce in vacuum to the carbide
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.
所需工具：
感应炉
真空泵
石墨坩埚3
3
Purge at 1600 °C
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.
所需工具：
感应炉真空泵石墨坩埚4
4
Distil the metal at 1900 °C onto tantalum
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.
所需工具：
感应炉真空泵石墨坩埚
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