Patent US4273532A successfully refreshed from Google Patents.
Patent US4287053A successfully refreshed from Google Patents.
US4287053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beneficiation of high carbonate phosphate ores
Assignee: Tennessee Valley Authority
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Filing: 1980-12-22
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Granted: 1981-09-01
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Expires: 2000-12-22
Abstract
Abstract A phosphate ore flotation process subjecting a phosphate ore containing carbonate mineral impurities to froth flotation in the presence of phosphate depressants, said depressants are alkyl phosphonic acids, and a carbonate collector, said collector is fatty acids, removing the separated carbonate minerals from the overflow, and recovering the phosphate value in the underflow. The process of the present invention can be performed either prior to or after the separation of siliceous matter from phosphate minerals by methods known in the art.
Inventors
- 👤 James R. Lehr
- 👤 Shuang-shii Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:03
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/06; B03D1/001; B03D1/004; B03D1/006; B03D1/008; B03D1/014; B03D1/021; B03D2201/00; B03D2201/02; B03D2201/06; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 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 a phosphate depressant, said depressant being selected from the group consisting of alkyl phosphonic acids, and a carbonate collector, said collector being a fatty acid; (2) removing the separated carbonate minerals from the overflow; and (3) recovering the phosphate values in the underflow.
Claim 2
Dependent Claim
68 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 a phosphate depressant, said depressant being selected from the group consisting of alkyl phosphonic acids, and a carbonate collector, said collector being a fatty acid; (2) removing the separated carbonate minerals from the overflow; and (3) recovering the phosphate values in the underflow.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said alkyl phosphonic acids are monoalkyl phosphonic acids.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein said alkyl phosphonic acids are dialkyl phosphonic acids.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein said alkyl phosphonic acid is hydroxylethylidene diphosphonic acid.
Claim 6
Dependent Claim
18 words
The process of claim 1 in which said fatty acids are employed as acid or as soap derivatives.
Claim 7
Dependent Claim
17 words
The process of claim 1 in which said fatty acids are employed in conjunction with fuel oil.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |