US3727831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for classifying fine particle materials
Assignee: Georgia Kaolin Co
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Filing: 1970-08-31
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Granted: 1973-04-17
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Expires: 1990-08-31
Abstract
Abstract Methods and apparatus are provided for classifying fine particles by the steps of feeding a slurry or slip to be classified into a rotating bowl centrifuge divided into two pool areas, one pool providing a relatively high speed helical path for said slip wherein coarse particles are thrown to the periphery of the bowl and carried outwardly and a second pool providing a relatively low speed path over a ribbon type conveyor wherein intermediate size particles are thrown into the ribbon conveyor and returned along the bowl periphery to the first pool where they are intermingled with the coarse particles there thrown out of suspension and discharged and an effluent port for the remaining slurry.
Inventors
- 👤 S Lyons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:56
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/20; B04B2001/2041; B04B2001/2058
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
121 words
A method for classifying fine particle materials from a fluid slip comprising the steps of feeding a fluid slip containing coarse, intermediate, and fine particles into a rotary bowl centrifuge, dividing the slip within said bowl into two pools, passing the slip in one pool along a helical path at comparatively high speed to discharge coarse particles onto the bowl wall, then passing the slip through the second pool at slow speed across a rotating ribbon conveyor adjacent the bowl periphery to discharge intermediate size particles into the ribbon conveyor, discharging the remaining slip, conveying the intermediate particles into the first pool on the bowl periphery and intermingling them with the coarse particles and discharging the intermingled coarse and intermediate particles.
Claim 2
Independent Claim
121 words
A method for classifying fine particle materials from a fluid slip comprising the steps of feeding a fluid slip containing coarse, intermediate, and fine particles into a rotary bowl centrifuge, dividing the slip within said bowl into two pools, passing the slip in one pool along a helical path at comparatively high speed to discharge coarse particles onto the bowl wall, then passing the slip through the second pool at slow speed across a rotating ribbon conveyor adjacent the bowl periphery to discharge intermediate size particles into the ribbon conveyor, discharging the remaining slip, conveying the intermediate particles into the first pool on the bowl periphery and intermingling them with the coarse particles and discharging the intermingled coarse and intermediate particles.
Claim 3
Dependent Claim
37 words
A method as claimed in claim 1 wherein the helical path is created by relatively rotating the centrifuge bowl and a helical conveyor which extends to the periphery of the bowl forming therewith a continuous helical path.
Claim 4
Dependent Claim
43 words
A method as claimed in claim 2 wherein the slip is divided into two pools by a circular baffle intermediate the bowl ends and spaced from the bowl periphery to provide a passageway along the bowl periphery from one pool to the other.
Claim 5
Independent Claim
142 words
The method of classifying fine particle materials from a liquid slip comprising the steps of a. feeding a liquid suspension to be classified having coarse, intermediate and fine particles into a rotating bowl centrifuge adjacent one end, b. subjecting said slip in one portion of said bowl to a conical helical flow path against the bowl interior whereby coarse particles are thrown onto the bowl wall, c. transferring the slip to an annular slower moving pool in a second portion of said bowl wherein intermediate particles are thrown onto the bowl wall, d. carrying the intermediate size particles counter to the slip flow to the said one portion where the coarse particles are thrown onto them, e. discharging the mixed coarse and intermediate particles from the said one end and, f. discharging the slip and suspended fine particles from the other end.
Claim 6
Independent Claim
142 words
The method of classifying fine particle materials from a liquid slip comprising the steps of a. feeding a liquid suspension to be classified having coarse, intermediate and fine particles into a rotating bowl centrifuge adjacent one end, b. subjecting said slip in one portion of said bowl to a conical helical flow path against the bowl interior whereby coarse particles are thrown onto the bowl wall, c. transferring the slip to an annular slower moving pool in a second portion of said bowl wherein intermediate particles are thrown onto the bowl wall, d. carrying the intermediate size particles counter to the slip flow to the said one portion where the coarse particles are thrown onto them, e. discharging the mixed coarse and intermediate particles from the said one end and, f. discharging the slip and suspended fine particles from the other end.
Claim 7
Dependent Claim
20 words
A method as claimed in claim 4 wherein the slip is fed at the axis of the helical flow path.
Claim 8
Dependent Claim
28 words
A method as claimed in claim 4 wherein the conical helical flow path is formed by relatively rotating a helical conveyor within one end of the rotatiNg bowl.
Claim 9
Dependent Claim
40 words
A method as claimed in claim 4 wherein the bowl interior is divided into two portions by a rotating circular baffle intermediate the bowl ends and spaced from the periphery of the bowl to form a passage for said slip.
Claim 10
Dependent Claim
168 words
A centrifuge for classifying fluid suspensions having coarse, intermediate and fine particles comprising a rotatable cylindrical bowl, a rotatable shaft on which said bowl is rotated, means for independently rotating each of said bowl and shaft at appropriate differential speeds, a circular baffle on said shaft within said bowl intermediate the ends of said bowl defining two separate pools, a helical conveyor on said shaft on one side of said baffle, said conveyor extending to a point adjacent the periphery of the bowl, a ribbon conveyor means on said shaft whose outer periphery closely approaches the inner periphery of the bowl at the end opposite the helical conveyor and on the side of the baffle opposite the helical conveyor, an input port delivering slip to be centrifuged to the helical conveyor at one end of the bowl, a particle reject port at the same end of the bowl as the input port and a slip discharge port at the opposite end of said bowl spaced from its periphery.
Claim 11
Dependent Claim
168 words
A centrifuge for classifying fluid suspensions having coarse, intermediate and fine particles comprising a rotatable cylindrical bowl, a rotatable shaft on which said bowl is rotated, means for independently rotating each of said bowl and shaft at appropriate differential speeds, a circular baffle on said shaft within said bowl intermediate the ends of said bowl defining two separate pools, a helical conveyor on said shaft on one side of said baffle, said conveyor extending to a point adjacent the periphery of the bowl, a ribbon conveyor means on said shaft whose outer periphery closely approaches the inner periphery of the bowl at the end opposite the helical conveyor and on the side of the baffle opposite the helical conveyor, an input port delivering slip to be centrifuged to the helical conveyor at one end of the bowl, a particle reject port at the same end of the bowl as the input port and a slip discharge port at the opposite end of said bowl spaced from its periphery.
Claim 12
Dependent Claim
19 words
A centrifuge as claimed in claim 8 wherein the input port is located at the axis of the bowl.
Claim 13
Dependent Claim
19 words
A centrifuge as claimed in claim 8 wherein the input end of the bowl is frusto conical in shape.
References Cited (Backward Citations)
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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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |