Patent US3647370A successfully refreshed from Google Patents.
US3647370A
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Separation of potassium phosphate and alumina
Assignee: PPG Industries Inc
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Filing: 1969-03-14
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Granted: 1972-03-07
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Expires: 1989-03-14
Abstract
Abstract Aqueous ammonia is employed to separate the phosphate content of a potassium aluminum phosphate as a solid phase. Typically, temperatures below 15* C. and ammonia concentration above 30 percent are relied upon.
Inventors
- 👤 Robert A Kearley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:05
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/30; C01B25/305; C01B25/306; C01B25/38; C01B25/39; C01B25/395; C01F; C01F7/00; C01F7/02; C01F7/04; C01F7/06; C01F7/0673; C01F7/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
16 words
The method of claim 1 wherein the ammonia concentration is between 35 and 60 weight percent.
Claim 2
Dependent Claim
13 words
The method of claim 1 wherein the ammoniated solution is below 15* C.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the solid phase is separated from the liquid phase.
Claim 4
Independent Claim
46 words
The method of separating the alumina and phosphate values of an aqueous potassium aluminum phosphate solution which comprises precipitating from the solution phosphate values therein as a solid phosphate-rich phase lean in alumina by substantially saturating with ammonia the solution at a temperature below 15* C.
Claim 5
Dependent Claim
16 words
The method of claim 5 wherein the ammoniated solution contains 35 to 60 weight percent ammonia.
Claim 6
Dependent Claim
21 words
The method of claim 5 wherein the solid precipitate is separated and washed with ammonia at a temperature below 15* C.
Claim 7
Dependent Claim
21 words
The method of claim 7 wherein the liquor remaining after separation of the solid phase is hydrolyzed to provide aluminum hydroxide.
Claim 8
Dependent Claim
27 words
The method of claim 5 wherein the ammoniated solution is at 0* to 10* C. and phosphate in the solid precipitate is present as potassium phosphate heptahydrate.
Claim 9
Independent Claim
100 words
A method of obtaining phosphate and alumina values from aluminum phosphate ore which comprises digesting the ore in aqueous potassium hydroxide, separating a water soluble potassium aluminum phosphate solution which results from the digestion, ammoniating this solution to provide an ammonia concentration therein of at least 30 weight percent whereby to precipitate a solid phosphate-rich phase, separating the solid phase, stripping ammonia from the remaining liquid phase, recycling so stripped ammonia for the ammoniation of further potassium aluminum phosphate solution and hydrolyzing alumina in the liquid from which the ammonia has been stripped to form a separable solid aluminum hydroxide.
References Cited (Backward Citations)
US1873490A
Cited
US2871095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |