Patent US3105756A successfully refreshed from Google Patents.
US3105756A
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Method of lowering the iron content of chromite ores or concentrates without appreciable lowering of the contained cr2o3
Assignee: Haalmer Corp
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Filing: 1959-06-18
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Granted: 1963-10-01
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Expires: 1979-06-18
Abstract
No abstract record available.
Inventors
- 👤 George E Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:12
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/02; C22B34/00; C22B34/30; C22B34/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A PROCESS OF UPGRADING CHRMITE ORE HAVING AN INITIAL CR:FE RATIO OF LESS THAN 3:1 TO A METALLURICAL GRADE CHRMITE ORE HAVING A FINAL CR:FE RATIO OF MORE THAN 3:1 WHEREIN FEO AND CR2O3 ARE MOLECULARLY GRADE ORE IN BOTH THE INTITIAL ORE AND IN THE METALLURGICAL RADE ORE COMPRISING THE STEPS OF COMMINUTING THE ORE, HEATING THE COMMINUTED ORE AT A PREFERRED TEMPERATURE RANGE OF ABOUT 700* TO 750* CENTIGRADE UNDER OXIDIZING CONDITIONS WHILE CONRLLING THE DEGREE OF COMMUNITION, THE HEATING THEMPERATURE AND THE OXIDIZING CONDITIONS SO AS TO OXIDIZE AT LEAST A PORTION OF THE FEO.CR2O3 THEREIN TO FE2O3ECR2O3, REDUCING AT LEAST A PORTION OF SAID FE2O32CRO3 AT A TEMPERATURE RANGE OF ABOUT 1200* TO 1370* CENTIGRADE TO FEO.2CREO3 AND UNCOMBINED FE3O4 WHILE LEAVING THE CR2O3 SUBSTANTIALLY UNCHANGED, AND EXTRACTING SAID UNOMBINED FE2O4 WITH A CHEMICAL REAGENT REACTIVE THEREWITH, WHEREBY THE RATIO OF CR TO FE IS INCREASED.
Claim 2
Dependent Claim
150 words
A PROCESS OF UPGRADING CHRMITE ORE HAVING AN INITIAL CR:FE RATIO OF LESS THAN 3:1 TO A METALLURICAL GRADE CHRMITE ORE HAVING A FINAL CR:FE RATIO OF MORE THAN 3:1 WHEREIN FEO AND CR2O3 ARE MOLECULARLY GRADE ORE IN BOTH THE INTITIAL ORE AND IN THE METALLURGICAL RADE ORE COMPRISING THE STEPS OF COMMINUTING THE ORE, HEATING THE COMMINUTED ORE AT A PREFERRED TEMPERATURE RANGE OF ABOUT 700* TO 750* CENTIGRADE UNDER OXIDIZING CONDITIONS WHILE CONRLLING THE DEGREE OF COMMUNITION, THE HEATING THEMPERATURE AND THE OXIDIZING CONDITIONS SO AS TO OXIDIZE AT LEAST A PORTION OF THE FEO.CR2O3 THEREIN TO FE2O3ECR2O3, REDUCING AT LEAST A PORTION OF SAID FE2O32CRO3 AT A TEMPERATURE RANGE OF ABOUT 1200* TO 1370* CENTIGRADE TO FEO.2CREO3 AND UNCOMBINED FE3O4 WHILE LEAVING THE CR2O3 SUBSTANTIALLY UNCHANGED, AND EXTRACTING SAID UNOMBINED FE2O4 WITH A CHEMICAL REAGENT REACTIVE THEREWITH, WHEREBY THE RATIO OF CR TO FE IS INCREASED.
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) | 1966-09-30 | 1967-04-01 | 1967-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-30 | 1971-04-01 | 1971-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-30 | 1975-04-01 | 1975-10-01 | $7700.00 | Window Closed / Lapsed |