US2718455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing basic iron sulfate
Assignee: NL Industries Inc
•
Filing: 1950-08-11
•
Granted: 1955-09-20
•
Expires: 1970-08-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Walter R Mccormick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:48
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
IN A PROCESS FOR THE TREATMENT OF METALLIC SULPHIDE ORE CONCENTRATE CONTAINING A PREPONDERANCE OF IRON SULPHIDE TOGETHER WITH METALLIC VALUES OF THE GROUP CONSISTING OF COPPER, NICKEL AND COBALT, THE STEPS WHICH COMPRISE ADMIXING THE CONCENTRATE WITH SUFFICIENT WATER TO FORM A SLURRY CONTAINING FROM 10% TO 40% SOLIDS, HEATING THE SLURRY WITH AGITATION AT A TEMPERATURE OF BETWEEN 400* F. AND 500* F. AT A PRESSURE OF MORE THAN 400 POUNDS PER SQUARE INCH IN THE PRESENCE OF AN OXYGEN-CONTAINING GAS FOR A PERIOD OF FROM 1 TO 3 HOURS TO OXIDIZE METALLIC SULPHIDES IN SAID SLURRY TO SULPHATES AND SIMULTANEOUSLY TO FORM THEREFROM A PRECIPITATE OF BASIC IRON SULPHATE CONTAINING A MAJOR PORTION OF THE IRON CONTENT OF SAID SLURRY AND A SOLUTION OF SULPHATES OF SAID METALLIC VALUES, AND SEPARATING SAID PRECIPITATE OF BASIC IRON SULPHATE FROM SAID SOLUTION.
Claim 2
Dependent Claim
143 words
IN A PROCESS FOR THE TREATMENT OF METALLIC SULPHIDE ORE CONCENTRATE CONTAINING A PREPONDERANCE OF IRON SULPHIDE TOGETHER WITH METALLIC VALUES OF THE GROUP CONSISTING OF COPPER, NICKEL AND COBALT, THE STEPS WHICH COMPRISE ADMIXING THE CONCENTRATE WITH SUFFICIENT WATER TO FORM A SLURRY CONTAINING FROM 10% TO 40% SOLIDS, HEATING THE SLURRY WITH AGITATION AT A TEMPERATURE OF BETWEEN 400* F. AND 500* F. AT A PRESSURE OF MORE THAN 400 POUNDS PER SQUARE INCH IN THE PRESENCE OF AN OXYGEN-CONTAINING GAS FOR A PERIOD OF FROM 1 TO 3 HOURS TO OXIDIZE METALLIC SULPHIDES IN SAID SLURRY TO SULPHATES AND SIMULTANEOUSLY TO FORM THEREFROM A PRECIPITATE OF BASIC IRON SULPHATE CONTAINING A MAJOR PORTION OF THE IRON CONTENT OF SAID SLURRY AND A SOLUTION OF SULPHATES OF SAID METALLIC VALUES, AND SEPARATING SAID PRECIPITATE OF BASIC IRON SULPHATE FROM SAID SOLUTION.
References Cited (Backward Citations)
US1384974A
Cited
US981451A
Cited
US1047826A
Cited
US1146071A
Cited
US1503229A
Cited
US1649152A
Cited
US2296423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-19 | 1959-03-21 | 1959-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-19 | 1963-03-21 | 1963-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-19 | 1967-03-21 | 1967-09-20 | $7700.00 | Window Closed / Lapsed |