Chemistry: electrical and wave energy – Processes and products
Patent
1988-09-12
1990-05-08
Tung, T.
Chemistry: electrical and wave energy
Processes and products
203 51, 423 73, 423 76, 423492, 75617, 75618, C25C 326
Patent
active
049235770
ABSTRACT:
This is a method of reducing zirconium chloride to a metal product by introducing zirconium chloride into a molten salt bath containing at least one alkali metal chloride and at least one alkaline earth metal chloride; and electrochemically reducing alkaline earth metal chloride to a metallic alkaline earth metal in the molten salt bath, with the reduced alkaline earth metal reacting with the zirconium chloride to produce zirconium metal. By using this electrochemical-metallothermic reduction, zirconium metal is produced and insoluble subchlorides of zirconium in the metal product are generally avoided.
Preferably, the molten salt in the molten salt bath consists essentially of a mixture of lithium chloride, potassium chloride, magnesium chloride and zirconium or hafnium chloride. The method is especially useful as part of a distillation system for separating hafnium from zirconium, possibly after the zirconium chloride is removed from the distillation system, but especially where the distillation system has an alkali metal chloride and alkaline earth metal chloride recirculating solvent and the electrochemical-metallothermic reduction is used to strip the solvent of zirconium chloride.
This process can also be used for hafnium and titanium, especially when a powder metal product is desired.
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McLaughlin David F.
Talko Francis
Ryser David G.
Stoltz R. A.
Tung T.
Westinghouse Electric Corp.
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