US2721796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leaching of oxidized nickel ores by pressurized ammonium sulfate
Assignee: Chemical Construction Corp
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Filing: 1950-04-12
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Granted: 1955-10-25
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Expires: 1970-04-12
Abstract
No abstract record available.
Inventors
- 👤 Patrick J Mcgauley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:55
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0407
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN THE LEACHING OF UNROASTED ORES OF HYDRATED NICKELIFEROUS SILICATES, THE IMPROVED PROCEDURE WHICH COMPRISES: PREPARING A LEACH LIQUOR COMPRISING AN AQUEOUS SOLUTION OF AMMONIUM SULFATE HAVING DISSOLVED THEREIN SUFFICIENT H2SO4 TO PROVIDE A PH LESS THAN ABOUT 6.5 , THE AMMONIUM SULFATE CONTENT THEREOF NOT EXCEEDING ABOUT 70% THAT REQUIRED FOR COMPLETE SATURATION; ADMIXING THE NICKEL-BEARING ORE WITH SUFFICIENT LEACH LIQUOR TO PROVIDE AT LEAST ONE MOL EQUIVALENT OF H2SO4 AND ONE MOL EQUIVALENT OF AMMONIUM SULFATE FOR EACH MOL OF NICKEL IN THE ORE; HEATING THE SLURRY TO A TEMPERATURE ABOVE ABOUT 175* C. UNDER AN INCREASED TOTAL PRESSURE NOT LESS THAN THE CRITICAL PRESSURE AT THE OPERATING TEMPERATURE; CONTINUING THIS TREATMENT FOR SUFFICIENT TIME TO DISSOLVE SUBSTANTIALLY ALL THE SOLUBLE NICKEL; DISCHARGING A SLURRY OF LEACHED ORE AND SPENT LIQUOR AND REMOVING THE RESIDUAL SOLIDS THEREFROM.
Claim 2
Dependent Claim
139 words
IN THE LEACHING OF UNROASTED ORES OF HYDRATED NICKELIFEROUS SILICATES, THE IMPROVED PROCEDURE WHICH COMPRISES: PREPARING A LEACH LIQUOR COMPRISING AN AQUEOUS SOLUTION OF AMMONIUM SULFATE HAVING DISSOLVED THEREIN SUFFICIENT H2SO4 TO PROVIDE A PH LESS THAN ABOUT 6.5 , THE AMMONIUM SULFATE CONTENT THEREOF NOT EXCEEDING ABOUT 70% THAT REQUIRED FOR COMPLETE SATURATION; ADMIXING THE NICKEL-BEARING ORE WITH SUFFICIENT LEACH LIQUOR TO PROVIDE AT LEAST ONE MOL EQUIVALENT OF H2SO4 AND ONE MOL EQUIVALENT OF AMMONIUM SULFATE FOR EACH MOL OF NICKEL IN THE ORE; HEATING THE SLURRY TO A TEMPERATURE ABOVE ABOUT 175* C. UNDER AN INCREASED TOTAL PRESSURE NOT LESS THAN THE CRITICAL PRESSURE AT THE OPERATING TEMPERATURE; CONTINUING THIS TREATMENT FOR SUFFICIENT TIME TO DISSOLVE SUBSTANTIALLY ALL THE SOLUBLE NICKEL; DISCHARGING A SLURRY OF LEACHED ORE AND SPENT LIQUOR AND REMOVING THE RESIDUAL SOLIDS THEREFROM.
References Cited (Backward Citations)
US2520958A
Cited
US2576314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |