Patent US4486301A successfully refreshed from Google Patents.
US4486301A
Expired / Lapsed
US
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Method of beneficiating high carbonate phosphate ore
Assignee: TENNESSEE VALLEY AUTHORAITY
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Filing: 1984-01-16
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Granted: 1984-12-04
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Expires: 2004-01-16
Abstract
Abstract A phosphate ore flotation process subjecting a phosphate ore containing carbonate mineral impurities to froth flotation in the presence of modifying agents, said modifying agents being alkyl phosphonic acids and hydrofluoric acid, and a collector, said collector being fatty acids; collecting the phosphate and carbonate minerals as rougher concentrate from the overflow; subjecting the phosphate and carbonate mineral concentrate to a differential desorption with an acid to remove the fatty acid from the surface of the phosphate mineral; removing the separated carbonate minerals from the overflow; and recovering the phosphate values in the underflow.
Inventors
- 👤 Shuang-shii Hsieh
- 👤 James R. Lehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:37
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/018; B03D1/004; B03D1/008; B03D1/02; B03D1/021; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
An ore flotation process which comprises the steps of (1) subjecting a phosphate ore containing carbonate mineral impurities to froth flotation in the presence of modifying agents, said modifying agents being alkyl phosphonic acid and hydrofluoric acid, and a collector, said collector being a fatty acid; (2) collecting the phosphate and carbonate minerals as rougher concentrate from the overflow; (3) subjecting the phosphate and carbonate mineral concentrate to a differential desorption with an acid to remove fatty acid from the surface of phosphate mineral; (4) removing the separated carbonate minerals from the overflow; and (5) recovering the phosphate values in the underflow.
Claim 2
Dependent Claim
102 words
An ore flotation process which comprises the steps of (1) subjecting a phosphate ore containing carbonate mineral impurities to froth flotation in the presence of modifying agents, said modifying agents being alkyl phosphonic acid and hydrofluoric acid, and a collector, said collector being a fatty acid; (2) collecting the phosphate and carbonate minerals as rougher concentrate from the overflow; (3) subjecting the phosphate and carbonate mineral concentrate to a differential desorption with an acid to remove fatty acid from the surface of phosphate mineral; (4) removing the separated carbonate minerals from the overflow; and (5) recovering the phosphate values in the underflow.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said alkyl phosphonic acids are alkyl diphosphonic acids.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein said alkyl phosphonic acid is hydroxylethylidene disphosphonic acid.
Claim 5
Dependent Claim
18 words
The process of claim 1 in which said fatty acids are employed as acid or as soap derivatives.
Claim 6
Dependent Claim
20 words
The process of claim 1 in which said fatty acids are employed in conjunction with fuel oil as an extender.
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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |