US2726953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective nucleated precipitation from acidic solutions
Assignee: Chemical Construction Corp
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Filing: 1954-06-21
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Granted: 1955-12-13
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Expires: 1974-06-21
Abstract
No abstract record available.
Inventors
- 👤 Roy Tuhin Kumar
- 👤 Schaufelberger Felix Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:39
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0453; C22B23/0461; C22B3/00; C22B3/20; C22B3/44; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
IN THE HYDROMETALLURGICAL PRODUCTION OF NON-FERROUS METALS, WHEREIN AN AQUEOUS ACID LIQUOR CONTAINING (A) AT LEAST ONE DISSOLVED METAL VALUE OF INTEREST SELECTED FROM THE GROUP CONSISTING OF COBALT, COPPER, NICKEL AND ZINC, AND (B) AT LEAST ONE DISSOLVED CONTAMINANT METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM, ALUMINUM, MAGNESIUM, MANGANESE AND IRON, IS TREATED WITH HYDROGEN SULFIDE TO CHEMICALLY PRECIPATE SAID METAL CONTENT OF INTEREST, THE IMPROVED METHOD OF SELECTIVELY CONCENTRATING THE CONTENT OF SAID METAL-VALUE-OF-INTEREST AND SEPARATING THE SAME FROM THE CONTENT OF SAID DISSOLVED CONTAMINANT METAL WHICH COMPRISES THE STEPS OF: ADJUSTING THE FREE ACID CONTENT OF THE LIQUOR TO LESS THAN THAT AT ABOUT 3% BUT MORE THAN THAT EQUIVALENT TO A PH OF ABOUT 3.5; ADDING AS THE NUCLEATING AGENT, FROM ABOUT 0.1 TO ABOUT FIVE GRAMS PER LITER OF ADDED MINUS 60 MESH POWDERED NON-METALLIC SOID MATERIAL; PRODUCING IN RESULTANT SLURRY A TEMPERATURE OF FROM ABOUT 90* TO ABOUT 150* C.; SUBJECTING SAID HOT SLURRY TO AN OVER-PRESSURE OF AT LEAST 25 P.S.I.G. OF HYDROGEN SULFIDE AND CONTINUING TREATMENT WITH AGITATION UNTIL SULFIDE PRECIPATION SUBSTANTIALLY CEASES.
Claim 2
Dependent Claim
182 words
IN THE HYDROMETALLURGICAL PRODUCTION OF NON-FERROUS METALS, WHEREIN AN AQUEOUS ACID LIQUOR CONTAINING (A) AT LEAST ONE DISSOLVED METAL VALUE OF INTEREST SELECTED FROM THE GROUP CONSISTING OF COBALT, COPPER, NICKEL AND ZINC, AND (B) AT LEAST ONE DISSOLVED CONTAMINANT METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM, ALUMINUM, MAGNESIUM, MANGANESE AND IRON, IS TREATED WITH HYDROGEN SULFIDE TO CHEMICALLY PRECIPATE SAID METAL CONTENT OF INTEREST, THE IMPROVED METHOD OF SELECTIVELY CONCENTRATING THE CONTENT OF SAID METAL-VALUE-OF-INTEREST AND SEPARATING THE SAME FROM THE CONTENT OF SAID DISSOLVED CONTAMINANT METAL WHICH COMPRISES THE STEPS OF: ADJUSTING THE FREE ACID CONTENT OF THE LIQUOR TO LESS THAN THAT AT ABOUT 3% BUT MORE THAN THAT EQUIVALENT TO A PH OF ABOUT 3.5; ADDING AS THE NUCLEATING AGENT, FROM ABOUT 0.1 TO ABOUT FIVE GRAMS PER LITER OF ADDED MINUS 60 MESH POWDERED NON-METALLIC SOID MATERIAL; PRODUCING IN RESULTANT SLURRY A TEMPERATURE OF FROM ABOUT 90* TO ABOUT 150* C.; SUBJECTING SAID HOT SLURRY TO AN OVER-PRESSURE OF AT LEAST 25 P.S.I.G. OF HYDROGEN SULFIDE AND CONTINUING TREATMENT WITH AGITATION UNTIL SULFIDE PRECIPATION SUBSTANTIALLY CEASES.
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) | 1958-12-12 | 1959-06-13 | 1959-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-12 | 1963-06-13 | 1963-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-12 | 1967-06-13 | 1967-12-13 | $7700.00 | Window Closed / Lapsed |