Patent US4362615A successfully refreshed from Google Patents.
US4362615A
Expired / Lapsed
US
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Froth flotation of rutile
Assignee: United States Department of the Interior
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Filing: 1981-10-15
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Granted: 1982-12-07
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Expires: 2001-10-15
Abstract
Abstract Rutile is recovered from copper ore tailings by means of a froth flotation process comprising: (a) flotation of sulfides and carbonates at a pH of about 9 to 10, using sodium isopropyl xanthate and sodium oleate as collectors, and detrine as rutile depressant, and (b) flotation of rutile from the resulting tailings at a pH of about 2 to 3, using hydrofluoric acid as a rutile selectivity-assisting agent and water-soluble petroleum sulfonate as rutile collector.
Inventors
- 👤 Thomas O. Llewellyn
- 👤 Gerald V. Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:53
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/06; B03D1/001; B03D1/004; B03D1/012; B03D1/016; B03D2201/00; B03D2201/02; B03D2201/06; B03D2203/00; B03D2203/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
75 words
A froth flotation process for recovery of rutile from copper ore tailings comprising: (a) flotation of sulfides and carbonates at a pH of about 9 to 10, using sodium isopropyl xanthate and sodium oleate as collectors, and dextrin as rutile depressant, and (b) flotation of rutile from the tailings of step (a) at a pH of about 2 to 3, using hydrofluoric acid as a rutile selectivity-assisting agent and water-soluble petroleum sulfonate as rutile collector.
Claim 2
Dependent Claim
75 words
A froth flotation process for recovery of rutile from copper ore tailings comprising: (a) flotation of sulfides and carbonates at a pH of about 9 to 10, using sodium isopropyl xanthate and sodium oleate as collectors, and dextrin as rutile depressant, and (b) flotation of rutile from the tailings of step (a) at a pH of about 2 to 3, using hydrofluoric acid as a rutile selectivity-assisting agent and water-soluble petroleum sulfonate as rutile collector.
Claim 3
Dependent Claim
23 words
The process of claim 1 in which the copper ore tailings are tailings from removal of copper from porphyry copper ores by flotation.
Claim 4
Dependent Claim
22 words
The process of claim 1 in which the copper ore tailings are initially ground to a particle size of about minus 200-mesh.
Claim 5
Dependent Claim
16 words
The process of claim 1 in which the copper ore tailings are deslimed prior to flotation.
Claim 6
Dependent Claim
37 words
The process of claim 1 in which water is added to the copper ore tailings in an amount to provide a slurry of about 20 percent by weight of solids prior to flotation of sulfides and carbonates.
Claim 7
Dependent Claim
27 words
The process of claim 1 in which the tailings from step (a) are adjusted to about 40 percent by weight of solids prior to flotation of rutile.
Claim 8
Dependent Claim
23 words
The process of claim 1 in which sulfuric acid is used to adjust the pH to about 2 to 3 in step (b).
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) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |