Patent US2148773A successfully refreshed from Google Patents.
Patent US3872010A successfully refreshed from Google Patents.
US3872010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation machine
Assignee: Mitsui Kinzoku Co Ltd
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Filing: 1974-08-29
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Granted: 1975-03-18
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Expires: 1994-08-29
Abstract
Abstract A flotation machine comprising a flotation cell having therein an air inlet pipe for introducing air into the liquid being treated, a rotating body for agitating said liquid, and a dispersing unit having a plurality of guide vanes, characterized by the improvement that the outer end of the external periphery of each guide vane in the dispersing unit is positioned circumferentially forwardly of an imaginary straight line connecting the center of the dispersing unit to the inner end of the trailing side of the adjacent leading guide vane in the direction of rotation of the rotating body.
Inventors
- 👤 Tatsuya Nagahama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:40
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/1493; B03D1/16; B03D1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
345 words
A froth flotation machine comprising a flotation cell having an air inlet pipe for introducing air into the flotation liquid close to the bottom of the cell, froth removal means for removing froth from the upper end of the cell, a rotatable impeller disposed close to the bottom of the cell for mixing the flotation liquid with the air supplieD by the pipe and circulating the mixture along the bottom of the cell, an annular stationary dispersing unit mounted on the lower end of said air inlet pipe and adjacent to the bottom wall of the cell, said impeller being disposed within the central opening of said dispersing unit and said dispersing unit being coaxial with the axis of rotation of said impeller, said dispersing unit comprising two coaxial, vertically spaced, imperforate, annular supports, a series of substantially uniformly spaced guide vanes mounted on and extending between said supports and located in the path of flow of said mixture from said impeller and being forwardly curved in the direction of rotation of the impeller for directing the liquid in a direction substantially tangential to the side wall of the cell and substantially parallel to the bottom wall of the cell, with the radially outer edge of each guide vane being positioned forwardly of its radially inner edge in the direction of rotation of said impeller, each pair of adjacent guide vanes defining a discharge passage for said mixture, said discharge passage having an inlet at the radially inner end thereof and an outlet at the radially outer end thereof, said outer edge of each guide vane also being positioned circumferentially forwardly of said inner edge of the adjacent leading guide vane in the direction of rotation of said impeller, the entirety of the outlet of each discharge passage being disposed circumferentially forwardly of the entirety of the inlet of the same discharge passage in the direction of rotation of said impeller, and the radially outer edge of said upper annular support is located substantially at and directly above the outer edges of said guide vanes.
Claim 2
Dependent Claim
345 words
A froth flotation machine comprising a flotation cell having an air inlet pipe for introducing air into the flotation liquid close to the bottom of the cell, froth removal means for removing froth from the upper end of the cell, a rotatable impeller disposed close to the bottom of the cell for mixing the flotation liquid with the air supplieD by the pipe and circulating the mixture along the bottom of the cell, an annular stationary dispersing unit mounted on the lower end of said air inlet pipe and adjacent to the bottom wall of the cell, said impeller being disposed within the central opening of said dispersing unit and said dispersing unit being coaxial with the axis of rotation of said impeller, said dispersing unit comprising two coaxial, vertically spaced, imperforate, annular supports, a series of substantially uniformly spaced guide vanes mounted on and extending between said supports and located in the path of flow of said mixture from said impeller and being forwardly curved in the direction of rotation of the impeller for directing the liquid in a direction substantially tangential to the side wall of the cell and substantially parallel to the bottom wall of the cell, with the radially outer edge of each guide vane being positioned forwardly of its radially inner edge in the direction of rotation of said impeller, each pair of adjacent guide vanes defining a discharge passage for said mixture, said discharge passage having an inlet at the radially inner end thereof and an outlet at the radially outer end thereof, said outer edge of each guide vane also being positioned circumferentially forwardly of said inner edge of the adjacent leading guide vane in the direction of rotation of said impeller, the entirety of the outlet of each discharge passage being disposed circumferentially forwardly of the entirety of the inlet of the same discharge passage in the direction of rotation of said impeller, and the radially outer edge of said upper annular support is located substantially at and directly above the outer edges of said guide vanes.
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 |