US3627129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for the separating out of coarse and/or heavy particles from a variable particle size and/or variable particle weight mixture of granular solids maintained in a fluidized state
Assignee: GEA Group AG
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Filing: 1969-01-21
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Granted: 1971-12-14
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Expires: 1989-01-21
Abstract
Abstract Elutriation apparatus and process using apparatus comprising an upper and a lower member separated by a restricted intermediate cross section member wherein the lower member has a lesser cross section than the upper member. The process is carried out by operating the lower member as a dispersed suspension (known per se) elutriation apparatus and by operating the upper member as a dense fluidized bed (known per se) elutriation apparatus with the intermediate member causing an increase in the velocity, of at least 1.2 times, of the elutriant passing therethrough from the lower to the upper members.
Inventors
- 👤 Rainer Hartmann
- 👤 Oskar Dorschner
- 👤 Hans-Werner Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:41
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/44; B01J8/0015; B01J8/003; B01J8/005; B01J8/0055; B01J8/26; B01J8/28; C; C08; C08F; C08F10/00; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00168; B01J2208/00256; B01J2208/00265; B01J2208/00274
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
23 words
Elutriation apparatus as claimed in claim 1 wherein said lower chamber and said upper chamber having cross-sectional ratio of about 1:3 to 1:10.
Claim 2
Dependent Claim
25 words
Elutriation apparatus as claimed in claim 1 wherein said intermediate member includes a pair of spaced perforated plates with pipes interconnecting the respective perforations thereof.
Claim 3
Dependent Claim
36 words
Elutriation apparatus as claimed in claim 3 including elutriant supply means connected to the space between said perforated plates of said intermediate member and communicating with said upper chamber through bores provided in said upper plate.
Claim 4
Dependent Claim
31 words
Elutriation apparatus as claimed in claim 1 wherein said intermediate member includes an insert element radially spaced from the juncture of said upper and lower chambers to form an annular gap.
Claim 5
Dependent Claim
56 words
Elutriation apparatus as claimed in claim 5 wherein said insert element consists at least partially of a conical member having an axis substantially coincident with the axis of said upper and lower chambers and having a maximum diameter which is no greater than the inside diameter of said lower member, which conical member is axially displaceable.
Claim 6
Dependent Claim
27 words
Elutriation apparatus as claimed in claim 1 including elutriant fluid discharge means disposed below said intermediate member and elutriant fluid introduction means disposed above said intermediate member.
Claim 7
Dependent Claim
128 words
Process of continuously elutriating a particulate material of varying grain size which comprises feeding a fluid to and through a first zone; establishing and maintaining a dispersed suspension in said first zone; feeding said fluid from said first zone through an intermediate zone whose cross section is a smaller cross section with respect to said dispersed suspension zone up to about 0.85 thereof, increasing the velocity thereof to more than 1.2 times the velocity thereof in said first zone; feeding said fluid from said intermediate zone to a second zone having a cross-sectional ratio of about 2:1 to 15:1 with respect to said first zone; establishing and maintaining a dense fluidized bed in said second zone; recovering coarser grain particles from the base of said dispersed suspension zone.
Claim 8
Dependent Claim
51 words
The process as claimed in claim 8 including providing said intermediate zone as a perforated plate and sizing the apertures of said perforations such that the diameters thereof are about 5 to 20 times the particle size of the coarser grain particles recovered from the base of said dispersed suspension zone.
Claim 9
Dependent Claim
46 words
Process as claimed in claim 8 including providing said intermediate zone as an annulus between a jacket means and an insert element which annulus has a gap which is about 2 to 10 times the diameter of said coarser grain particles withdrawn from said lower zone.
Claim 10
Dependent Claim
19 words
Process as claimed in claim 8 including tapping a portion of said elutriant fluid upstream of said intermediate zone.
Claim 11
Dependent Claim
20 words
Process as claimed in claim 11 including reintroducing said tapped elutriant fluid to said process downstream of said intermediate zone.
Claim 12
Dependent Claim
28 words
Process as claimed in claim 12 including admixing said tapped elutriant fluid with fresh elutriant fluid and feeding said admixture To said process downstream of said intermediate zone.
Claim 13
Dependent Claim
12 words
Process as claimed in claim 8 with said elutriant fluid is gas.
Claim 14
Dependent Claim
11 words
Process as claimed in claim 8 carried out at elevated pressure.
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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |