Title:
MANUFACTURE OF SUPERHIGH PURITY HEAVY METAL FLUORIDE, SUPERHIGH PURITY SODIUM FLUORIDE AND OPTICAL PART
Document Type and Number:
Japanese Patent JPS58140306
Kind Code:
A
Abstract:
The specification discloses a process for the preparation of ultrapure thorium fluoride (ThF4) having minimized water content and consequent maximized optical transmission of 10.6 micrometer radiation. First, thorium oxide is reacted with aqueous hydrofluoric acid to form a solid reaction product, which is then dried under controlled heating to form a hydrated thorium fluoride with a predetermined amount of hydration, namely ThF4.xH2O where x is equal to 0.39. The hydrated thorium fluoride is exposed to a reactive atmosphere of hydrofluoric acid vapor and a selected fluoride compound in the gas phase at elevated temperature for a predetermined period of time. The reactive atmosphere removes substantially all of the water and water-derived impurities from the hydrated thorium fluoride to produce ultrapure thorium fluoride which is highly transmissive to 10.6 micrometer radiation.
Inventors:
RIKARUDO SHII PASUTAA
REMEDEIOSU KEE CHIYUU
REMEDEIOSU KEE CHIYUU
Application Number:
JP1157483A
Publication Date:
August 20, 1983
Filing Date:
January 28, 1983
Export Citation:
Assignee:
HUGHES AIRCRAFT CO
International Classes:
C01B9/08; C01F15/00; C01F17/00; C01G21/16; C03C13/04; (IPC1-7): C01B9/08; C01F15/00; C01F17/00; C01G21/16; C03C25/02
Domestic Patent References:
| JP44008007A |
Attorney, Agent or Firm:
Takehiko Suzue