US3013664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beneficiation of phosphate rock
Assignee: SMITH DOUGLASS CO Inc
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Filing: 1959-08-06
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Granted: 1961-12-19
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Expires: 1979-08-06
Abstract
No abstract record available.
Inventors
- 👤 Clinton A Hollingsworth
- 👤 Bobby L Sapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:48
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
THE METHOD OF BENEFICIATING PHOSPHATE ROCK HAVING A PARTICLE SIZE OF LESS THAN ABOUT 14 MESH WHICH COMPRISES SUBJECTING AN AQUEOUS PULP OF THE ROCK TO A FIRST FROTH FLOATATION OPERATION IWTH A CATIONIC FLOTATION REAGENT TO FLOAT FROM THE AQUEOUS PULP SUBSTANTIALLY ALL OF THE SILICA HAVING A PARTICLE SIZE OF ABOUT MINUS 35 MESH CONDITIONING THE ROUGHER PHOSPHATE CONCENTRATE UNDERFLOW FROM THE CATIONIC FLOTATION OPERATION WITH AN ANIONIC FLOTATION REAGENT, SUBJECTING THE CONDITIONED ROUGHER CONCENTRATE TO A SECOND FROTH FLOTATION OPERATION TO FLOAT A FINAL PHOSPHATE CONCENTRATE WHICH IS RECOVERED AS THE DESIRED PHOSPHATE PRODUCT, AND RECIRCULATING THE UNFLOATED TAILINGS FROM THE PHOSPHATE FLOTATION OPERATION SUCCESSIVELY THROUGH THE FIRST AND SECOND FLOTATION STEPS OF THE PROCESS, SAID RECIRCULATED TAILINGS FROM THE PHOSPHATE FLOTATION STEP CONTAINING ACTIVATED SILICA HAVING A PARTICLE SIZE OF BETWEEN ABOUT MINUS 14 MESH AND PLUS 35 MESH AND DIFFICULT TO FLOAT PHOSPHATE PARTICLES, SAID ACTIVATED SILICA PARTICLES AND DIFFICULT TO FLOAT PHOSPHATE PARTICLES BEING FLOATED DURING THE SUCCEEDING SILICA FLOTATION STEPS AND PHOSPHATE FLOTATION STEPS OF THE PROCESS.
Claim 2
Independent Claim
174 words
THE METHOD OF BENEFICIATING PHOSPHATE ROCK HAVING A PARTICLE SIZE OF LESS THAN ABOUT 14 MESH WHICH COMPRISES SUBJECTING AN AQUEOUS PULP OF THE ROCK TO A FIRST FROTH FLOATATION OPERATION IWTH A CATIONIC FLOTATION REAGENT TO FLOAT FROM THE AQUEOUS PULP SUBSTANTIALLY ALL OF THE SILICA HAVING A PARTICLE SIZE OF ABOUT MINUS 35 MESH CONDITIONING THE ROUGHER PHOSPHATE CONCENTRATE UNDERFLOW FROM THE CATIONIC FLOTATION OPERATION WITH AN ANIONIC FLOTATION REAGENT, SUBJECTING THE CONDITIONED ROUGHER CONCENTRATE TO A SECOND FROTH FLOTATION OPERATION TO FLOAT A FINAL PHOSPHATE CONCENTRATE WHICH IS RECOVERED AS THE DESIRED PHOSPHATE PRODUCT, AND RECIRCULATING THE UNFLOATED TAILINGS FROM THE PHOSPHATE FLOTATION OPERATION SUCCESSIVELY THROUGH THE FIRST AND SECOND FLOTATION STEPS OF THE PROCESS, SAID RECIRCULATED TAILINGS FROM THE PHOSPHATE FLOTATION STEP CONTAINING ACTIVATED SILICA HAVING A PARTICLE SIZE OF BETWEEN ABOUT MINUS 14 MESH AND PLUS 35 MESH AND DIFFICULT TO FLOAT PHOSPHATE PARTICLES, SAID ACTIVATED SILICA PARTICLES AND DIFFICULT TO FLOAT PHOSPHATE PARTICLES BEING FLOATED DURING THE SUCCEEDING SILICA FLOTATION STEPS AND PHOSPHATE FLOTATION STEPS OF THE PROCESS.
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) | 1964-12-18 | 1965-06-19 | 1965-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-18 | 1969-06-19 | 1969-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-18 | 1973-06-19 | 1973-12-19 | $7700.00 | Window Closed / Lapsed |