US3632329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of magnesium in fertilizer base solutions
Assignee: Freeport Mcmoran Resource Partners Ltd
•
Filing: 1970-03-16
•
Granted: 1972-01-04
•
Expires: 1990-03-16
Abstract
Abstract A process for removing magnesium from ammonium phosphate fertilizer solutions by seeding the solution with magnesium ammonium pyrophosphate crystals while the temperature and pH of the solution are about 100* F. and about 6.2, respectively, and agitating the solution concurrently with the seeding.
Inventors
- 👤 Richard M Tillman
- 👤 Donald L Whitfill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:15
CPC Classifications
C; C05; C05B; C05B7/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
The method defined in claim 1 wherein the pH of the solution is maintained at about 6.2 during seeding.
Claim 2
Dependent Claim
22 words
The method defined in claim 1 wherein the temperature of the solution is maintained at from about 100* to about 105* F.
Claim 3
Dependent Claim
25 words
The method defined in claim 1 wherein the solution is seeded with from about 2.0 weight percent to 10 weight percent ammonium pyrophosphate tetrahydrate crystals.
Claim 4
Independent Claim
98 words
The method of manufacturing a stable clarified liquid ammonium phosphate base fertilizer solution comprising: continuously passing liquid ammonium phosphate base fertilizer solution through a container; maintaining the solution in the container at a temperature of from about 100* to about 125* F., and at a pH of from about 6.2 to about 7; continuously agitating the solution in the container; continuously seeding the solution by adding an effective amount of crystals of a magnesium phosphate salt to the solution in said container to precipitate magnesium salts from the solution; and separating said precipitated magnesium salts from the solution.
Claim 5
Dependent Claim
30 words
The method defined in claim 5 wherein said solution is retained in said container for an average residence time of at least 3 days in the course of passing therethrough.
Claim 6
Dependent Claim
56 words
The method defined in claim 5 and further characTerized as including the steps of: quiescently preaging said solution for a period of from about 2 weeks to about 3 weeks before passing the solution through the container; and retaining the solution in the container during its passage therethrough for a period not exceeding about 7 hours.
Claim 7
Dependent Claim
58 words
The method defined in claim 5 and further characterized to include the steps of: continuously separating magnesium ammonium pyrophosphate salt from a mixture of base fertilizer solution and said salt leaving said container; and continuously recycling at least a portion of said magnesium ammonium pyrophosphate salt to said container to constitute said crystals continuously added to said solution.
Claim 8
Dependent Claim
25 words
The method defined in claim 8 wherein the solution in the container is maintained at a temperature of from about 100* to about 105* F.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |