PURIFICATION OF THE ACTIVE DEPOSIT OF OLD RADIOEMANATION AMPOULES (in Portuguese)
Journal Article
·
· Faculty of Sciences in Lisbon
OSTI ID:4358793
If crude ZrCl/sub 4/, containing HfCl/sub 4/, is heated with Zr powder in vacuo at 400 to 450 deg C, most of the ZrCl/sub 4/ is reduced to the comparatively involatile trichloride. The HfCl/sub 4/ is not reduced and, together with any unreduced ZrCl/sub 4/, can be recovered by sublimation as a Hf concentrate with a Hf/Zrratio higher than 10%. The residual ZrCl/sub 3/ in which the original Hf/Zr ratio of the crude chloride has been reduced from 2% to less than 0.05%, can be disproportionated at 550 deg C to give ZrCl/sub 4/ with a correspondingly low Hf content. Factors controlling the reduction process are discussed, and a separation technique is outlined. (auth)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-12-000157
- OSTI ID:
- 4358793
- Journal Information:
- Faculty of Sciences in Lisbon, Journal Name: Faculty of Sciences in Lisbon Vol. Vol: B3
- Country of Publication:
- Country unknown/Code not available
- Language:
- Portuguese
Similar Records
FUSION DIAGRAM OF BINARY SYSTEMS CONSISTING OF A ZIRCONIUM AND HAFNIUM HALIDE
Vapor pressure of ZrCl{sub 4} and HfCl{sub 4} over melt systems KCl + AlCl{sub 3} (1:1.04 mol) + ZrCl{sub 4} and KCl + AlCl{sub 3} (1:1.04 mol) + HfCl{sub 4}
A STUDY OF THE STABILITY OF ZIRCONIUM AND HAFNIUM TETRAHALIDES ON HITTING A HOT SURFACE IN VACUUM
Journal Article
·
Wed Feb 28 23:00:00 EST 1962
· Zhur. Neorg. Khim.
·
OSTI ID:4841735
Vapor pressure of ZrCl{sub 4} and HfCl{sub 4} over melt systems KCl + AlCl{sub 3} (1:1.04 mol) + ZrCl{sub 4} and KCl + AlCl{sub 3} (1:1.04 mol) + HfCl{sub 4}
Journal Article
·
Sat Jul 01 00:00:00 EDT 1995
· Journal of Chemical and Engineering Data
·
OSTI ID:94341
A STUDY OF THE STABILITY OF ZIRCONIUM AND HAFNIUM TETRAHALIDES ON HITTING A HOT SURFACE IN VACUUM
Journal Article
·
Sat Sep 01 00:00:00 EDT 1962
· Doklady Akademii Nauk SSSR (U.S.S.R.) English translation currently published in a number of subject-oriented journals
·
OSTI ID:4797121