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US 4,655,827 AGranted
Process for the reduction of fluorides of silicon, titanium, zirconium or uranium
OwnerAngel Sanjurjo, Kenneth M. Sancierinventors
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Abstract
A process is disclosed for producing silicon, titanium, zirconium or uranium by reduction of a fluoro compound with sodium followed by leaching with an aqueous alkaline earth metal chloride and recovery of the sodium metal through electrolytic reduction.
Claims11
A process for the production of silicon, titanium, zirconium or uranium which comprises:
- (a) reacting silicon tetrafluoride, titanium tetrafluoride, zirconium tetrafluoride, uranium tetrafluoride or uranium hexafluoride with elemental sodium to obtain a mixture of silicon titanium, zirconium or uranium and sodium fluoride;
- (b) adding an aqueous solution of an alkaline earth metal chloride;
- (c) allowing the sodium fluoride to react with the alkaline earth metal chloride to form a slurry comprising an insoluble alkaline earth metal fluoride and silicon, titanium, zirconium or uranium in a solution of sodium chloride;
- (d) separating the silicon, titanium, zirconium or uranium from said slurry;
- (e) separating the alkaline earth metal fluoride from said slurry;
- and
- (f) electrolytically reducing the sodium chloride to obtain pure sodium metal.
4 more elements
A process for the production of silicon which comprises:
- (a) reacting silicon tetrafluoride with elemental sodium to produce a mixture of silicon and sodium fluoride;
- (b) adding an aqueous solution of calcium chloride;
- (c) allowing the sodium fluoride to react with the calcium chloride to form a slurry of calcium fluoride and silicon in aqueous sodium chloride;
- (d) separating the silicon from said slurry;
- (e) separating the calcium fluoride from said slurry;
- (f) drying the sodium chloride;
- and
- (g) electrolytically reducing the sodium chloride to obtain sodium metal.
5 more elements
Dependencies are inferred from the claim text.