Chemistry: electrical and wave energy – Processes and products
Patent
1990-05-11
1991-03-19
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
204 64R, C25C 334, C25C 336
Patent
active
050008293
ABSTRACT:
A process for the preparation of a praseodymium-iron alloy or a praseodymium-neodymium-iron alloy, which comprises using praseodymium fluoride (PrF.sub.3) or a mixture of praseodymium fluoride and neodymium fluoride (NdF.sub.3) as the starting material and carrying out the electrolysis in a fused salt bath having a composition comprising substantially 5 to 34% by weight of PrF.sub.3 or a mixture of PrF.sub.3 and NdF.sub.3 and 95 to 66% by weight of lithium fluoride (LiF) by using an iron cathode, and a process for the preparation of praseodymium metal or a praseodymium-neodymium alloy which comprises using praseodymium fluoride (PrF.sub.3) or a mixture of praseodymium fluoride and neodymium fluodide (NdF.sub.3) as the starting material and carrying out the electrolysis in a fused salt bath having a comprising substantially 5 to 75% by weight of PfF.sub.3 or the mixture of PrF.sub.3 and NdF.sub.3 and 95 to 25% by weight of lithium fluoride (LiF) by using a cathode of carbon or an infusible metal.
REFERENCES:
R. E. Thoma, Progress in Science and Technology of the Rare Earths, vol. 2, p. 110, Pergamon Press, New York, 1966.
E. Morrice et al, Bur. Mine Rep. Invest. No. 6957, 1967.
E. Morrice et al. Bur. Mine Rep Invest. No. 7146, 1968.
Kaplan G. L.
Showa Denko Kabushiki Kaisha
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