Patent US1378579A successfully refreshed from Google Patents.
US3764007A
Expired / Lapsed
US
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Separation process for solid particles of differing shape
Assignee: Lonza AG
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Filing: 1971-06-07
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Granted: 1973-10-09
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Expires: 1991-06-07
Abstract
Abstract The present invention is concerned with a process for the separation of solid particles of different shape but of similar weight, wherein the particles to be separated are suspended in a liquid. In the suspension there is produced, with the exclusion of turbulence, a flow velocity profile by imparting to a 2 - 20 mm. thick layer of the suspension, a rotary movement by the use of two discs, at least one of which is rotating, which discs bound the layer of suspension above and below, there being a difference of rotational speed between the two discs. Those particles which, due to their form, are not carried by the suspending liquid throughout the flow thereof, separate out from the suspension. The separated particles are withdrawn from the suspension at a separation zone.
Inventors
- 👤 E Schmid
- 👤 R Egli
- 👤 B Bruttel
- 👤 R Nascher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:31
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/24; B01D21/26; B01D21/262
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
174 words
A process for the separation of a first type of solid particles from a second type of solid particles, said first and second types of solid particles being of a different shape but of a similar weight, said process comprising: suspensing said first and second types of particles in a liquid; passing the thus formed suspension without forming turbulence therein, into a space between two vertically spaced apart discs at a point intermediate the periphery and the center of said discs and forming a 2 - 20 mm. thick layer of said suspension between said discs; creating a difference in rotational speed between said two discs, and thus creating a velocity profile of the flow of said suspension between said discs; whereby one of said types of particles, due to the shape thereof, is not carried by said suspending liquid throughout said flow velocity profile, and separates from said suspension; and withdrawing one of said types of particles centrally of said discs and the other of said types of particles peripherally of said discs.
Claim 2
Dependent Claim
174 words
A process for the separation of a first type of solid particles from a second type of solid particles, said first and second types of solid particles being of a different shape but of a similar weight, said process comprising: suspensing said first and second types of particles in a liquid; passing the thus formed suspension without forming turbulence therein, into a space between two vertically spaced apart discs at a point intermediate the periphery and the center of said discs and forming a 2 - 20 mm. thick layer of said suspension between said discs; creating a difference in rotational speed between said two discs, and thus creating a velocity profile of the flow of said suspension between said discs; whereby one of said types of particles, due to the shape thereof, is not carried by said suspending liquid throughout said flow velocity profile, and separates from said suspension; and withdrawing one of said types of particles centrally of said discs and the other of said types of particles peripherally of said discs.
Claim 3
Dependent Claim
14 words
Process according to claim 1, wherein only the upper of said discs is rotated.
Claim 4
Dependent Claim
13 words
Process according to claim 1, wherein said suspending liquid comprises water and/or acetone.
Claim 5
Dependent Claim
45 words
Process according to claim 3, wherein said suspending liquid is water, the layer thickness is 4 - 6 mm; and the distance of the upper rotating of said discs from the bottom of the lower of said discs is thereby also 4 - 6 mm.
Claim 6
Dependent Claim
19 words
Process according to claim 3, wherein said suspending liquid is water and the layer thickness is approximately 5 mm.
Claim 7
Dependent Claim
28 words
Process according to claim 1, wherein the product of the diameter and the frequency difference of said discs gives a constant value of between 300 and 1,000 cm./min.
Claim 8
Dependent Claim
28 words
Process according to claim 6, wherein the product of the diameter and the frequency difference of said discs gives a constant value of between 500 and 900 cm./min.
Claim 9
Dependent Claim
41 words
Process according to claim 1, wherein said suspension is supplied through an inlet in the bottom of a separation vessel formed by the lower of said discs, said inlet lying between a central and a peripheral outlet of said separation vessel.
Claim 10
Dependent Claim
21 words
Process according to claim 8, wherein said inlet is at a point about half-way along the radius of said lower disc.
Claim 11
Dependent Claim
50 words
Process according to claim 1, wherein a part of said suspension is withdrawn through a central, circular opening in the bottom of a separation vessel formed by the lower of said discs, the diameter of said opening being between 10 - 20 percent of the diameter of said lower disc.
Claim 12
Dependent Claim
22 words
Process according to claim 10, wherein the diameter of said opening is approximately 15 percent of the diameter of said lower disc.
Claim 13
Dependent Claim
22 words
Process according to claim 1, wherein a part of said suspension is withdrawn through a tangentially arranged outlet constructed as an overflow.
Claim 14
Dependent Claim
22 words
Process according to claim 1, wherein the solids content of said suspension is 5 - 100 mg. per litre of suspension liquid.
Claim 15
Dependent Claim
22 words
Process according to claim 13, wherein the solids content of said suspension is 20 - 50 mg. per litre of suspension liquid.
Claim 16
Independent Claim
155 words
A device for the separation of a first type of solid particles from a second type of solid particles, said first and second types of solid particles being of a different shape but of a similar weight, wherein said particles are suspended in a suspending liquid, said device comprising: a separation vessel having a cylindrical peripheral wall and a disc-shaped bottom, said bottom having a central flowout opening therein, said bottom further having at least one suspension inlet situated between said central opening and said peripheral wall, said peripheral wall having at least one suspension outlet in the form of a tangential overflow; a freely vertically movable rotating disc positioned above said bottom to rotate on the top of a layer of said suspension, said rotating disc having a diameter slightly smaller than the inner diameter of said peripheral wall; and means attached to said rotating disc to rotate the same at a predetermined speed.
Claim 17
Independent Claim
155 words
A device for the separation of a first type of solid particles from a second type of solid particles, said first and second types of solid particles being of a different shape but of a similar weight, wherein said particles are suspended in a suspending liquid, said device comprising: a separation vessel having a cylindrical peripheral wall and a disc-shaped bottom, said bottom having a central flowout opening therein, said bottom further having at least one suspension inlet situated between said central opening and said peripheral wall, said peripheral wall having at least one suspension outlet in the form of a tangential overflow; a freely vertically movable rotating disc positioned above said bottom to rotate on the top of a layer of said suspension, said rotating disc having a diameter slightly smaller than the inner diameter of said peripheral wall; and means attached to said rotating disc to rotate the same at a predetermined speed.
Claim 18
Dependent Claim
19 words
Device according to claim 15, comprising a storage vessel for said suspension to be fed to said separation vessel.
Claim 19
Dependent Claim
36 words
Device according to claim 15, further comprising an open storage vessel which, for the continuous operation of said device, is adapted to be filled at intervals, and which has a pump attached to an outlet thereof.
Claim 20
Dependent Claim
38 words
Device according to claim 15, further comprising a dilution and homogenizing device provided with an inlet, a stopcock and a flowmeter for dilution liquid, said dilution and homogenizing device being connected to the inlet of said separation vessel.
Claim 21
Dependent Claim
53 words
Device according to claim 15, wherein between the rotating disc and said means to rotate, there is provided a ball-and-socket joint, said rotating disc being constructed as a floating body, the distance between said rotating disc and said bottom being constant over the entire cross-sectional area of said bottom and said rotating disc.
Claim 22
Dependent Claim
23 words
Device according to claim 15, further comprising a settling vessel connected to said central opening, and a pump connected to said settling vessel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |