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Method for production of high-purity samarium metal.

Authors
Henrie-TA; Morrice-E Jr.; Murphy-JE
Source
U S Pat 3 524 800 1970 Aug; :
Link
NIOSHTIC No.
10011819
Abstract
Pure sm is deposited from a fused salt electrolyte of smf3 with lif or an alkaline-earth metal fluoride, in which sm2o3 is dissolved, at a temperature between the melting point of the fluoride bath and that of a fe, ni, or CO cathode, and the sm deposit diffuses into the cathode to form a fluid alloy that drips into a collecting vessel or remains as nodules in the salt bath. The cold alloy, or metal nodules separated from solid barren electrolyte can be heated in a 10-6-10-7 torr vacuum at 800 deg-900 deg c for a fe alloy, or a 1,100 deg-1,200 deg c for a CO or ni alloy, to sublime the sm as vapor that can be solidified on a cooled ta, w, or mo surface from which the sm coating can be peeled. The electrolyte preferably contains 40-90 wt pct smf3 and the alloys generally contain 12-20 pct fe or 20-30 pct CO or ni. In a 1.5 H electrolysis with carbon anodes and a fe cathode in an a.C. Heated bath containing 81 pct smf3 and the balance lif, to which sm2o3 was added, at 960 deg c in a graphite crucible having a 580 deg c bottom temperature and an inert atmosphere, 0.5 A/cm2 was used. The current efficiency was 41 pct. Sm was sublimed by vacuum heating of the nodules as described, with 60 pct recovery as a coating on a cold w cover; and the peeled- off sm metal product contained 10 ppm fe, <100 ppm o, <10 ppm c, and no la or other rare earth.
Publication Date
19700801
Fiscal Year
1970
NTIS Accession No.
NTIS Price
Identifying No.
PAT 3,524,800
NIOSH Division
RERC
Source Name
U.S. Pat. 3,524,800; Aug. 18, 1970; Chem. Abstr. 73:126,483K
State
NV
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