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Tantalum: Fused Fluoride Bath with Tantalum Oxide Electrolysed at 700 °C (Driggs, US 1,815,054)
A melt of potassium and sodium fluorides with potassium tantalum fluoride carries dissolved tantalum oxide; a direct current of about 20 A deposits tantalum powder on the graphite crucible while oxygen leaves at the carbon anode. Feeding in more oxide keeps it running.
Result: crystalline tantalum powder, ready for pressing and sintering.
Source: F. H. Driggs (Westinghouse), US patent 1,815,054 (filed 1928), pp. 1-3. When the oxide runs out the voltage jumps and fluorine is set free: stop at once. Picture drawn by Youblob.
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