Patent US4829027A successfully refreshed from Google Patents.
Patent US2706557A successfully refreshed from Google Patents.
US2706557A
Expired / Lapsed
US
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Concentration of phosphate ores
Assignee: Minerals & Chemicals Corp
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Filing: 1953-12-07
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Granted: 1955-04-19
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Expires: 1973-12-07
Abstract
No abstract record available.
Inventors
- 👤 Wesley M Houston
- 👤 Jr Harvie W Breathitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:50
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
156 words
A METHOD OF CONCENTRATING PHOSPHATE MINERALS FROM THEIR ORES WHICH INCLUDES THE FOLLOWING STEPS: (1) SUBJECTING THE ORE IN AN AQUEOUS PULP TO A FROTH-FLOTATION TREATMENT WITH NEGATIVE-ION REAGENTS, THEREBY PRODUCING A FROTH-PRODUCT WHICH IS A ROUGHER CONCENTRATE OF THE PHOSPHATE VALUES MIXED WITH SOME SILICIOUS GANGUE, AND A TAILING CONSISTING CHIEFLY OF SILICIOUS MATERIAL WHICH IS DISCARDED; (2) SUBJECTING SAID ROUGHER CONCENTRATE TO RETARDED FROTH-FLOTATION TREATMENT IN WHICH THE NORMAL FLOATABILITY OF THE PHOSPHATE IS RESTRAINED BY ADDING ACID TO THE PULP, THEREBY PRODUCING A FROTH-PRODUCT WHICH IS A PHOSPHATE CONCENTRATE HAVING A LOW INSOLUBLE CONTENT, AND A MACHINE-DISCHARGE WHICH IS A PHOSPHATE-RICH MIDDLING; AND (3) REFLOATING SAID PHOSPHATE-RICH MIDDLING IN A PULP HAVING A HIGHER PH THAN THAT OF SAID MIDDLING. THEREBY PRODUCING A FROTH-PRODUCT WHICH IS A CONCENTRATE OF PHOSPHATE VALUES WHICH CAN BE COMBINED WITH THE CONCENTRATE FROM STEP (2), AND A TAILING CONSISTING CHIEFLY FO SILICIOUS MATERIAL WHICH CAN BE DISCARDED.
Claim 2
Independent Claim
156 words
A METHOD OF CONCENTRATING PHOSPHATE MINERALS FROM THEIR ORES WHICH INCLUDES THE FOLLOWING STEPS: (1) SUBJECTING THE ORE IN AN AQUEOUS PULP TO A FROTH-FLOTATION TREATMENT WITH NEGATIVE-ION REAGENTS, THEREBY PRODUCING A FROTH-PRODUCT WHICH IS A ROUGHER CONCENTRATE OF THE PHOSPHATE VALUES MIXED WITH SOME SILICIOUS GANGUE, AND A TAILING CONSISTING CHIEFLY OF SILICIOUS MATERIAL WHICH IS DISCARDED; (2) SUBJECTING SAID ROUGHER CONCENTRATE TO RETARDED FROTH-FLOTATION TREATMENT IN WHICH THE NORMAL FLOATABILITY OF THE PHOSPHATE IS RESTRAINED BY ADDING ACID TO THE PULP, THEREBY PRODUCING A FROTH-PRODUCT WHICH IS A PHOSPHATE CONCENTRATE HAVING A LOW INSOLUBLE CONTENT, AND A MACHINE-DISCHARGE WHICH IS A PHOSPHATE-RICH MIDDLING; AND (3) REFLOATING SAID PHOSPHATE-RICH MIDDLING IN A PULP HAVING A HIGHER PH THAN THAT OF SAID MIDDLING. THEREBY PRODUCING A FROTH-PRODUCT WHICH IS A CONCENTRATE OF PHOSPHATE VALUES WHICH CAN BE COMBINED WITH THE CONCENTRATE FROM STEP (2), AND A TAILING CONSISTING CHIEFLY FO SILICIOUS MATERIAL WHICH CAN BE DISCARDED.
References Cited (Backward Citations)
US2682337A
Cited
US2676705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-18 | 1958-10-18 | 1959-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-18 | 1962-10-18 | 1963-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-18 | 1966-10-18 | 1967-04-19 | $7700.00 | Window Closed / Lapsed |