US3225923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beneficiation of phosphate ores
Assignee: International Minerals and Chemical Corp
•
Filing: 1961-09-22
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Granted: 1965-12-28
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Expires: 1981-09-22
Abstract
No abstract record available.
Inventors
- 👤 James E Lawver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:41
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/021; Y; Y10; Y10S; Y10S209/00; Y10S209/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A PROCESS FOR BENEFICIATING A SUBSTANTIALLY DESLIMED, -4+200 MESH FLORIDA PEBBLE KPHOSPHATE ORE FRACTION COMPRISING COARSE AND FINE PHOSPHATE PARTICLES AND COARSE AND FINE SILICA PARTICLES, SILICA BEING A MAJOR GANGUE CONSTITUENT OF SAID ORE FRACTION WHICH COMPRISES REMOVING A SUBSTANTIAL AMOUNT OF THE RELATIVELY SMALLER SIZE SILICA PARTICLES FROM SAID ORE FRACTION AS A FLOAT PRODUCT IN A CATIONIC FROTH FLOTATION OPERATION TO PRODUCE AN INTERMEDIATE PHOSPHATE ORE FRACTION CONTAINING A SUBSTANTIALLY LOWER CONCENTRATION OF RELATIVELY SMALLER SIZE SILICA PARTICLES AS COMPARED TO THE PEBBLE PHOSPHATE ORE FRACTION FEED, HEATING SAID INTERMEDIATE PHOSPHATE ORE FRACTION TO A TEMPERATURE OF AT LEAST 70*F. TO DRY SAID FRACTION, DIFFERENTIALLY CHARGING SAID DRIED FRACTION, PASSING THE DIFFERENTIALLY CHARGED FRACTION THROUGH AN ELECTROSTATIC FIELD AT A TEMPERATURE NOT GREATER THAN ABOUT 500*F., AND RECOVERING A PHOSPHATE CONCENTRATE.
Claim 2
Dependent Claim
134 words
A PROCESS FOR BENEFICIATING A SUBSTANTIALLY DESLIMED, -4+200 MESH FLORIDA PEBBLE KPHOSPHATE ORE FRACTION COMPRISING COARSE AND FINE PHOSPHATE PARTICLES AND COARSE AND FINE SILICA PARTICLES, SILICA BEING A MAJOR GANGUE CONSTITUENT OF SAID ORE FRACTION WHICH COMPRISES REMOVING A SUBSTANTIAL AMOUNT OF THE RELATIVELY SMALLER SIZE SILICA PARTICLES FROM SAID ORE FRACTION AS A FLOAT PRODUCT IN A CATIONIC FROTH FLOTATION OPERATION TO PRODUCE AN INTERMEDIATE PHOSPHATE ORE FRACTION CONTAINING A SUBSTANTIALLY LOWER CONCENTRATION OF RELATIVELY SMALLER SIZE SILICA PARTICLES AS COMPARED TO THE PEBBLE PHOSPHATE ORE FRACTION FEED, HEATING SAID INTERMEDIATE PHOSPHATE ORE FRACTION TO A TEMPERATURE OF AT LEAST 70*F. TO DRY SAID FRACTION, DIFFERENTIALLY CHARGING SAID DRIED FRACTION, PASSING THE DIFFERENTIALLY CHARGED FRACTION THROUGH AN ELECTROSTATIC FIELD AT A TEMPERATURE NOT GREATER THAN ABOUT 500*F., AND RECOVERING A PHOSPHATE CONCENTRATE.
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) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |