Patent US2967757A successfully refreshed from Google Patents.
US2967757A
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Acid process for the recovery of rhenium values from minerals containing same
Assignee: Kennecott Corp
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Filing: 1958-10-31
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Granted: 1961-01-10
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Expires: 1978-10-31
Abstract
No abstract record available.
Inventors
- 👤 Stuart R Zimmerley
- 👤 Emil E Malouf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:27
CPC Classifications
C; C22; C22B; C22B61/00; C01; C01G; C01G47/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
112 words
AN ACID PROCESS FOR THE RECOVERY OF ABOUT 90 TO 95% OF THE RHENIUM CONTAINED BY A MOLYBDENUM SULFIDE METALLURGICAL CONCENTRATE COMPRISING THOROUGHLY WETTING SUCH A CONCENTRATE WITH ABOUT TWICE ITS WEIGHT OF SULFURIC ACID TO MAKE A SLURRY; AS A FIRST STAGE, HEATING SAID SLURRY TO APPROXIMATELY 300*C. FOR APPROXIMATELY THREE HOURS TO OXIDIZE THE RHENIUM CONTENT THEREOF; THEREAFTER, AND AS A SECOND STAGE, INCREASING THE HEAT TO APPROXIMATELY 400*C. AND MAINTAINING IT AT ABOUT THAT TEMPERATURE FOR A PERIOD OF APPROXIMATELY FIVE HOURS, WHILE VIGOROUSLY AGITATING THE SLURRY, TO VOLATILIZE ANY UNREACTED ACID AND THE RHENIUM OXIDE WHICH FORMED; AND TREATING THE RESULTING VAPORS FOR THE RECOVERY OF RHENIUM OXIDE.
Claim 2
Dependent Claim
112 words
AN ACID PROCESS FOR THE RECOVERY OF ABOUT 90 TO 95% OF THE RHENIUM CONTAINED BY A MOLYBDENUM SULFIDE METALLURGICAL CONCENTRATE COMPRISING THOROUGHLY WETTING SUCH A CONCENTRATE WITH ABOUT TWICE ITS WEIGHT OF SULFURIC ACID TO MAKE A SLURRY; AS A FIRST STAGE, HEATING SAID SLURRY TO APPROXIMATELY 300*C. FOR APPROXIMATELY THREE HOURS TO OXIDIZE THE RHENIUM CONTENT THEREOF; THEREAFTER, AND AS A SECOND STAGE, INCREASING THE HEAT TO APPROXIMATELY 400*C. AND MAINTAINING IT AT ABOUT THAT TEMPERATURE FOR A PERIOD OF APPROXIMATELY FIVE HOURS, WHILE VIGOROUSLY AGITATING THE SLURRY, TO VOLATILIZE ANY UNREACTED ACID AND THE RHENIUM OXIDE WHICH FORMED; AND TREATING THE RESULTING VAPORS FOR THE RECOVERY OF RHENIUM OXIDE.
Claim 3
Dependent Claim
51 words
THE PROCESS OF CLAIM 1, WHEREIN THE MINERAL MATERIAL CONTAINS SULFUR IN EXCESS OF WHAT MAY BE COMBINED WITH THE RHENIUM AND IS FIRST SUBJECTED TO A ROASTING OPERATION AT APPROXIMATELY 600*C. FOR APPROXIMATELY TWO HOURS FOR OXIDIZING A CONSIDERABLE QUANTITY OF SULFUR THEREFROM WITHOUT VOLATILIZING ANY SIGNIFICANT QUANTITY OF RHENIUM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-10 | 1964-07-11 | 1965-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-10 | 1968-07-11 | 1969-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-10 | 1972-07-11 | 1973-01-10 | $7700.00 | Window Closed / Lapsed |