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US 4,127,235 AGranted
Process for producing pulverous selenium from raw selenium
AssigneeOutokumpu Oy
InventorsBorje E. W. Klaile, Jussi J. Kayhko, Eino A. Rosenberg
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Abstract
A process for producing pulverous selenium from dried raw selenium by distillation, granulating the molten distillate, dripping it into water, grinding the granules, and drying the powder, in which the drying of the raw selenium before the distillation is by spray drying, the selenium granules being ground while in the form of an aqueous slurry, and the final drying of the ground selenium slurry being again effected by spray drying.
Claims6
A process for producing pulverous selenium from raw selenium, comprising:
- spray drying the raw selenium;
- distilling the dried raw selenium;
- granulating the molten distillate by dripping it into water;
- grinding an aqueous slurry of the selenium granules;
- and finally spray drying the ground selenium slurry to produce pulverous selenium.
2 more elements
Dependencies are inferred from the claim text.