US3872002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for extracting phosphate from solutions
Assignee: GeoResources Inc
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Filing: 1973-03-29
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Granted: 1975-03-18
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Expires: 1993-03-29
Abstract
Abstract Preparation of insoluble salts of humic acid under controlled conditions; use of humates to extract phosphate contaminants from solutions, such as wastewaters, generally in the naturallyoccurring pH range, and removal of the resulting humate/phosphate component from the solution; and regenerating the humate in said humate/phosphate component under aqueous alkaline conditions.
Inventors
- 👤 Ralph E Musgrove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:39
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/286
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
73 words
A METHOD OF EXTRACTING WATER-SOLUBLE PHOSPHATE CONTAMINANTS FROM A SOLUTION WHICH COMPRISES INTIMATELY BLENDING A WATER-INSOLUBLE HUMIC ACID SALT SELECTED FROM THE GROUP CONSISTING OF IRON HUMATE, ALUMINUM HUMATE AND MIXTURES THEREOF WITH THE SOLUTION CONTAINING SAID WATER-SOLUBLE PHOSPHATE CONTAMINANTS, SUBSQUENTLY REMOVING THE RESULTING WATERINSOLUBLE HUMATE/PHOSPHATE SOLIDS COMPONENT FROM THE SOLUTION, LEACHING SAID HUMATE/PHOSPHATE SOLIDS COMPONENT WITH AN ALKALI SOLUTION AND SEPARATING THE RESULTING REGENERATED HUMATE SEPARATED AS SOLIDS FROM THE LEACH SOLUTION.
Claim 2
Independent Claim
73 words
A METHOD OF EXTRACTING WATER-SOLUBLE PHOSPHATE CONTAMINANTS FROM A SOLUTION WHICH COMPRISES INTIMATELY BLENDING A WATER-INSOLUBLE HUMIC ACID SALT SELECTED FROM THE GROUP CONSISTING OF IRON HUMATE, ALUMINUM HUMATE AND MIXTURES THEREOF WITH THE SOLUTION CONTAINING SAID WATER-SOLUBLE PHOSPHATE CONTAMINANTS, SUBSQUENTLY REMOVING THE RESULTING WATERINSOLUBLE HUMATE/PHOSPHATE SOLIDS COMPONENT FROM THE SOLUTION, LEACHING SAID HUMATE/PHOSPHATE SOLIDS COMPONENT WITH AN ALKALI SOLUTION AND SEPARATING THE RESULTING REGENERATED HUMATE SEPARATED AS SOLIDS FROM THE LEACH SOLUTION.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the water-insoluble humic acid salt is iron humate.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the water insoluble humic acid salt is aluminum humate.
Claim 5
Dependent Claim
62 words
The method of claim 1 wherein the humic acid salt is prepared by admixing a source of humic acid with water, adjusting the pH to a value greater than 7, adding to the humic acid mixture a soluble mineral acid salt of a metal selected from the group consisting of iron and aluminum, and separating the resultant humate precipitate from the liquid.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein the source of humic acid is leonardite.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein the source of humic acid is low rank coal.
Claim 8
Dependent Claim
13 words
The method of claim 1 wherein the source of humic acid is peat.
Claim 9
Dependent Claim
15 words
The method of claim 1 wherein the mineral acid salt is ferric or ferrous chloride.
Claim 10
Dependent Claim
14 words
The method of claim 1 wherein the mineral acid salt is an aluminum salt.
Claim 11
Dependent Claim
14 words
The method of claim 1 wherein the regenerated humate solids are washed and dried.
Claim 12
Dependent Claim
14 words
The method of claim 10 wherein the alkali solution is an ammonium hydroxide solution.
Claim 13
Dependent Claim
47 words
The method of claim 11 wherein the regenerated humate solids are blended with a solution containing phosphate contaminants, humate/phosphate solids are formed and removed, and the latter are again leached and regenerated prior to their further use in extracting phosphate contaminants from a solutIon containing the same.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |