US2783140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of fertilizer from highalumina phosphate ores
Assignee: Tennessee Valley Authority
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Filing: 1955-03-14
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Granted: 1957-02-26
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Expires: 1975-03-14
Abstract
No abstract record available.
Inventors
- 👤 Travis P Hignett
- 👤 Milton R Siegel
- 👤 Robert S Meline
- 👤 Thurman M Kelso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:12
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
A PROCESS FOR THE PRODUCTION OF FERTILIZER WHICH COMPRISES COMPLETELY CALCINING A HIGH-ALUMINA PHOSPHATE ORE AT TEMPERATURE IN THE RANGE FROM ABOUT 800* TO 1200*C.; CRUSHING THE CALCINED ORE AT LEAST FINE ENOUGH TO PASS THROUGH A SCREEN HAVING 1/2-INCH OPENINGS; EXTRACTING THE CRUSHED ORE WITH AN AQUEOUS SOLUTION OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF NITRIC ACID SULFURIC ACID, AND MIXTURES THEREOF, IN QUANTITY SUFFICIENT TO SUPPLY FROM 2.0 TO 10.0 MOLES OF ACID PER MOLE OF P2O5 AND SUFFICIENT TO GIVE 5 PERCENT TO 75 PERCEN SOLID MATTER IN THE RESULTING SLURRY; MAINTAINING THE TEMPERATURE OF THE SLURRY IN THE RANGE FROM ABOUT 80* TO 100* C. DURING EXTRACTION; REDUCING THE TEMPERATURE TO ABOUT 50* TO 70*C.; SEPARATING THE LIQUID PHASE OF SAID SLURRY FROM SOLID MATERIALS CONTAINED THEREIN; AMMONIATING THE SEPARATED LIQUID PHSE TO A PH IN THE RANGE FROM 3.0 TO 9.0 GRANULATING AND DRYING THE RESULTING MATERIAL; AND WITHDRAWING A HOMOGENEOUS, GRANULAR, NONCAKING FERTILIZER PRODUCT HAVING A HIGH PROPORTION OF ITS PHOSPHATE CONTENT IN CITRATE-SOLUBLE FORM.
Claim 2
Dependent Claim
173 words
A PROCESS FOR THE PRODUCTION OF FERTILIZER WHICH COMPRISES COMPLETELY CALCINING A HIGH-ALUMINA PHOSPHATE ORE AT TEMPERATURE IN THE RANGE FROM ABOUT 800* TO 1200*C.; CRUSHING THE CALCINED ORE AT LEAST FINE ENOUGH TO PASS THROUGH A SCREEN HAVING 1/2-INCH OPENINGS; EXTRACTING THE CRUSHED ORE WITH AN AQUEOUS SOLUTION OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF NITRIC ACID SULFURIC ACID, AND MIXTURES THEREOF, IN QUANTITY SUFFICIENT TO SUPPLY FROM 2.0 TO 10.0 MOLES OF ACID PER MOLE OF P2O5 AND SUFFICIENT TO GIVE 5 PERCENT TO 75 PERCEN SOLID MATTER IN THE RESULTING SLURRY; MAINTAINING THE TEMPERATURE OF THE SLURRY IN THE RANGE FROM ABOUT 80* TO 100* C. DURING EXTRACTION; REDUCING THE TEMPERATURE TO ABOUT 50* TO 70*C.; SEPARATING THE LIQUID PHASE OF SAID SLURRY FROM SOLID MATERIALS CONTAINED THEREIN; AMMONIATING THE SEPARATED LIQUID PHSE TO A PH IN THE RANGE FROM 3.0 TO 9.0 GRANULATING AND DRYING THE RESULTING MATERIAL; AND WITHDRAWING A HOMOGENEOUS, GRANULAR, NONCAKING FERTILIZER PRODUCT HAVING A HIGH PROPORTION OF ITS PHOSPHATE CONTENT IN CITRATE-SOLUBLE FORM.
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) | 1960-02-26 | 1960-08-27 | 1961-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-26 | 1964-08-27 | 1965-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-26 | 1968-08-27 | 1969-02-26 | $7700.00 | Window Closed / Lapsed |