Chemistry: electrical and wave energy – Processes and products
Patent
1984-09-07
1986-12-09
Williams, Howard S.
Chemistry: electrical and wave energy
Processes and products
C25C 334
Patent
active
046278982
ABSTRACT:
Praseodymium oxide is electrolyzed, at temperatures at or above the melting point of praseodymium metal, in a molten electrolyte initially consisting essentially of lithium fluoride and praseodymium fluoride. Improved current efficiency is obtained when the weight ratio of lithium fluoride to praseodymium fluoride in the electrolyte is about 0.1 to about 0.4.
REFERENCES:
patent: 2961387 (1960-11-01), Slatin
Thoma, Progress in the Science & Technology of the Rare Earths, vol. 2, Pergamon Press, N.Y (1966), p. 110.
E. Morrice and T. A. Henrie, Electrowinning High-Purity Neodymium, Praseodymium and Didymium Metals from Their Oxides, U.S. Dept. of the Interior, Bureau of Mines Report of Investigations 6957, May, 1967.
E. Morrice, E. S. Shedd, and T. A. Henrie, Direct Electrolysis of Rare-Earth Oxides to Metals and Alloys in Fluoride Melts, U.S. Dept. of the Interior, Bureau of Mines Report of Investigations 7146, Jun. 1968.
E. Morrice and M. M. Wong, "Fused Salt Electrowinning and Electrorefining of Rare-Earth and Yttrium Metals," Minerals Science Engineering, vol. 11, Jul. 1979, (pp. 125-136).
Franks Robert A.
Sandford Dean
Union Oil Company of California
Williams Howard S.
Wirzbicki Gregory F.
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