US4705624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and process for separating solid particles from a liquid suspension and/or for the purification or leaching of solid particles
Assignee: Niro Process Technology BV
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Filing: 1986-02-14
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Granted: 1987-11-10
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Expires: 2006-02-14
Abstract
Abstract Apparatus for separating solid particles from a liquid suspension and/or purification or leaching of solid particles, consisting of a cylindrical column which near one end is provided with a rotatable scraper for the disintegration of a washed compacted bed, an inlet for wash liquid and an outlet for the disintegrated particles, and contains near the opposite end of the column, means for supplying liquid suspension, a non movable screening device, which screening device is only permeable for the suspension liquid and an outlet for the liquid.
Inventors
- 👤 Henricus A. C. Thijssen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:36
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/004; B01D9/0045; B01D9/0004; B01D9/0009
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
213 words
A combination for separating solid particles from a liquid suspension and/or purification or leaching of solid particles, consisting of a cylindrical column closed at both ends by a fixed wall or a lid, provided near one end with a rotating scraper for the disintegration of a washed compacted bed, means for supplying wash liquid and means for removing suspended solid particles, and near the opposite end of the column provided with a non movable screening device for supplying pressurized liquid suspension, the withdrawal of liquid from the suspension out of the column and the transport of the compacted bed of solids, which screening device consists of two parallel circular plates mounted perpendicular to the axis of the column and having diameters equal to the inner diameter of the column of which part of the plate facing the scraper is permeable for liquid and not permeable for the suspended solids, where the other part of said plate contains channels which extend into the other parallel plate which channels are the inlet ducts supplying suspension, which channels have no open connections to the space enclosed by the two parallel plates and which channels have a diameter which is at least one order larger than the diameter of the perforations in the plate facing the scraper.
Claim 2
Dependent Claim
213 words
A combination for separating solid particles from a liquid suspension and/or purification or leaching of solid particles, consisting of a cylindrical column closed at both ends by a fixed wall or a lid, provided near one end with a rotating scraper for the disintegration of a washed compacted bed, means for supplying wash liquid and means for removing suspended solid particles, and near the opposite end of the column provided with a non movable screening device for supplying pressurized liquid suspension, the withdrawal of liquid from the suspension out of the column and the transport of the compacted bed of solids, which screening device consists of two parallel circular plates mounted perpendicular to the axis of the column and having diameters equal to the inner diameter of the column of which part of the plate facing the scraper is permeable for liquid and not permeable for the suspended solids, where the other part of said plate contains channels which extend into the other parallel plate which channels are the inlet ducts supplying suspension, which channels have no open connections to the space enclosed by the two parallel plates and which channels have a diameter which is at least one order larger than the diameter of the perforations in the plate facing the scraper.
Claim 3
Dependent Claim
30 words
A column according to claim 1, characterized in that the other parallel plate of the screening device not facing the scraper, is identical with the fixed wall closing the cylinder.
Claim 4
Dependent Claim
24 words
A column according to claim 2, characterized in that the supply of liquid suspension takes place through channels emanating from a central feed pipe.
Claim 5
Dependent Claim
69 words
A column according to claim 1, characterized in that the other parallel plate of the screening device not facing the scraper, is not identical with the fixed wall closing the cylinder, and the channels connect the spaces at both sides exterior to the parallel plates and the space between the other parallel plate and the wall closing that end of the cylinder comprises means for supplying the liquid suspension.
Claim 6
Dependent Claim
34 words
A column according to claim 4, characterized in that part of the other parallel plate of the screening device not facing the scraper is permeable for liquid and not permeable for the suspension solids.
Claim 7
Dependent Claim
35 words
A column according to claim 5, characterized in that the perforations in the plate at the side not facing the scraper have a substantially smaller diameter than the perforations of the plate facing the scraper.
Claim 8
Dependent Claim
38 words
A column according to claim 5, characterized in that the surface fraction of the perforations of the plate not facing the scraper is substantially smaller than the surface fraction of the perforations of the plate facing the scraper.
Claim 9
Dependent Claim
40 words
A column according to claim 4, characterized in that the plate of the screening device not facing the scraper is, except for the channels, not permeable for liquid and consists in whole or in part of a flexible membrane (106).
Claim 10
Dependent Claim
39 words
A column according to claim 4, characterized in that the plate (105) of the screening device not facing the scraper is, except for the channels, not permeable for liquid and is movable in the direction of the opposite plate.
Claim 11
Dependent Claim
35 words
A column according to claim 4, characterized in that a stirrer (5) is mounted in the space between the screening device and the fixed wall closing the cylindrical column where the liquid suspension is supplied.
Claim 12
Dependent Claim
33 words
A column according to claim 1, characterized in that the channels in the screening device, extending into the two parallel plates of the screening device, have a diameter between 0.2 and 10 cm.
Claim 13
Dependent Claim
33 words
A column according to claim 11, characterized in that the channels in the screening device, extending into the two parallel plates of the screening device, have a diameter between 0.5 and 3 cm.
Claim 14
Dependent Claim
26 words
A column according to claim 1, characterized in that the scraper rotates along the axis of the cylindrical column in a plane perpendicular to that axis.
Claim 15
Dependent Claim
39 words
A column according to claim 13, characterized in that the scraper is movable in the direction of the axis of the cylindrical column and practices a pressure on the washed compacted bed sufficient to disintegrate the washed compacted bed.
Claim 16
Dependent Claim
34 words
A screening device according to claim 13, charecterized in that one plate (105) is, except for the channels, not permeable for liquid and consists in whole or in part of a flexible membrane (106).
Claim 17
Dependent Claim
32 words
A screening device according to claim 13, characterized in that one plate (105) is, except for the channels, not permeable for liquid and is movable in the direction of the opposite plate.
Claim 18
Dependent Claim
119 words
A combination for separating solid particles from a liquid suspension and/or purification or leaching of solid particles comprising a column accoridng to claim 1, a pump (13) connected with the feed line to the column, a closed expansion vessel (14) which is partly filled with gas an expansion vessel (24), which is partly filled with gas, connected to the recirculation line after the heat exchanger (19) at least one sensor indicating the concentration difference that exists between the liquid solution and the wash liquid means for partly recirculating the wash liquid to the column valves (10), (11) controlling the supply of the liquid suspension and the withdrawal of liquid phase permeated through the plates of the screening device, respectively.
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) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |