Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Method of Adding Refractory Metal Halides to Molten Salt Electrolytes.

Authors
Martinez-GM
Source
U S Pat 3 600 284 1971 Aug; :
Link
NIOSHTIC No.
10011849
Abstract
Refractory metals such as Zr, HF, Nb, Mo, and Ta can be purified as metals by first vacuum vaporizing the impure halide to form an integrated solid mass which, despite a sublimation temperature of 300 deg. C, can be plunged into a molten electrolyte of an alkali metal halide at 500 deg.-700 Deg. C, and can then be electrodeposited on a cathode as pure metal. Combinations of the chlorides of li, rb, k, cs, and na can be used as the electrolyte. Some 1,000 g of hfc is chlorinated in an evacuated flask by heating it to 250 deg.-300 Deg. C in a current of cl2. The hfcl4 was formed in a dense ball weighing 800 g with a density of 3 g/cm3. The ball was placed in a cell with a graphite anode and a ni cathode with 15 kg of molten electrolyte at 700 deg. C in an inert atmosphere. An initial cathode current density of 216 a/ft2 was used and cl2 was vented at the anode. With a current efficiency of 94 pct, the test was operated for 10 a-h. The cathode deposits were leached with dilute hcl, washed, filtered, and dried, and the coarser 95 pct component of the hf had an o content of <40 ppm.
Publication Date
19710801
Document Type
PA;
Fiscal Year
1971
NTIS Accession No.
NTIS Price
Identifying No.
PAT 3,600,284
NIOSH Division
RERC;
Source Name
U.S. Pat. 3,600,284; Aug. 17, 1971; Chem. Abstr. 75:157,663Q
TOP