Patent US3664935A successfully refreshed from Google Patents.
US3664935A
Expired / Lapsed
US
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Effluent filtering process and apparatus for aluminum reduction cell
Assignee: Individual
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Filing: 1971-01-21
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Granted: 1972-05-23
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Expires: 1991-01-21
Abstract
Abstract The process and apparatus for filtering effluent issuing from a metallurgical furnace by passing the effluent through a sorbent. The furnace may be an aluminum reduction cell with the sorbent being alumina which is being fed to the cell. With an aluminum reduction cell, the effluent is first fed through a bed of alumina which is kept in a fluidized state by the effluent passing therethrough. The effluent from the fluidized bed is then passed through a non-fluidized wall of alumina which further filters the effluent and captures the alumina dust escaping from the fluidized bed. During this filtering, the alumina in the nonfluidized wall with the effluent contained therein is fed to the fluidized bed of alumina. In turn, the alumina in the fluidized bed together with the effluent contained therein is fed back to the cell from which the effluent originally issued.
Inventors
- 👤 Arthur F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:53
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/22
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
35 words
The method according to claim 1 including the steps of: a. feeding the fluidized bed along a predetermined path; and b. passing the effluent from the cell in a counter-current direction through the fluidized bed.
Claim 2
Dependent Claim
28 words
a horizontally disposed pervious second support member disposed between the lower end of said receptacle and said first support member for supporting a bed of fluidized alumina, and
Claim 3
Dependent Claim
19 words
regulating means at the outlet of said receptacle for feeding alumina received from said overflow conduit to said cell.
Claim 4
Dependent Claim
50 words
passage means connecting said supply of alumina with said bed of fluidized alumina; c. filter means for holding a layer of alumina in a non-fluidized state; and d. feed means for feeding effluent from said cell through the fluidized bed of alumina and then through the layer of non-fluidized alumina.
Claim 5
Dependent Claim
73 words
The method according to claim 1 including the steps of: a. providing a predetermined path for feeding of alumina from one elevation to a lower elevation; b. passing the effluent from the cell along said said predetermined path from said lower elevation to the higher elevation at a rate sufficient to fluidize said alumina, with the sloPe of said predetermined path being sufficient to feed said bed counter-current to the flow of effluent.
Claim 6
Dependent Claim
46 words
The method according to claim 1 including the steps of: a. feeding the non-fluidized layer of alumina with contained effluent to the fluidized bed; and b. feeding the alumina in the fluidized bed with the effluent contained therein into the fusion of the aluminum reduction cell.
Claim 7
Dependent Claim
25 words
The method according to claim 4 including the step of: a. passing the effluent from the cell through said fluidized bed under a reduced pressure.
Claim 8
Dependent Claim
34 words
The method according to claim 1 further comprising the step of: a. supplying additional alumina from a source separate from said fluidized bed of alumina to said non-fluidized layer as said layer is depleated.
Claim 9
Dependent Claim
33 words
The method according to claim 1 further comprising the steps of: a. providing a plurality of spaced non-fluidized layers of alumina; and b. confining the non-fluidized layers of alumina in a vertical orientation.
Claim 10
Dependent Claim
31 words
The method according to claim 1 including the step of: a. passing the effluent from the cell upwardly through a bed of alumina at a rate sufficient to fluidize the bed.
Claim 11
Dependent Claim
155 words
The combination with a cell for the electrolytic reduction of aluminum from fluoride fusions which comprises: a. a hood enclosing the upper part of the cell for collecting effluent from the cell; b. support means for carrying a bed of alumina in a fluidized state, said support means including a duct disposed at an angle to the horizontal for feeding alumina in a fluidized state downwardly therethrough and into said cell; c. filter means for holding a layer of alumina in a non-fluidized state; and d. feed means for feeding effluent from said cell through the fluidized bed of alumina and then through the layer of non-fluidized alumina, said feed means including suction means for feeding effluent from said cell upwardly through said duct at a rate sufficient to fluidize the alumina therein, said duct being sloped at an angle sufficient to permit the fluidized alumina therein to flow by gravity countercurrent to the effluent.
Claim 12
Dependent Claim
46 words
The combination according to claim 9 wherein said filter means includes: a. a structure at the upper end of said duct having supported therein a plurality of upright filters, each filter consisting of two walls providing a space therebetween for confining a layer of pulverulent alumina.
Claim 13
Dependent Claim
51 words
The combination according to claim 10 further comprising: a. a receptacle above the filters for holding a supply of alumina which feeds into and maintains the filters filled with alumina; and b. regulating means for feeding alumina from the bottom of the filters and into the upper end of said chute.
Claim 14
Dependent Claim
132 words
The combination with a cell for the electrolytic reduction of aluminum from fluoride fusions which comprises: a. a hood enclosing the upper part of the cell for collecting effluent from the cell; b. support means for carrying a bed of alumina in a fluidized state, said support means including a horizontally disposed pervious member for holding a bed of alumina; c. filter means for holding a layer of alumina in a non-fluidized state; and d. feed means for feeding effluent from said cell through the fluidized bed of alumina and then through the layer of non-fluidized alumina, said feeding means including means for creating a pressure differential on vertically opposite sides of said bed for feeding effluent upwardly through said bed at a rate sufficient to fluidize the alumina in the bed.
Claim 15
Dependent Claim
34 words
The combination according to claim 12 wherein: a. said filter means includes means for holding a plurality of vertically spaced layers of non-fluidized alumina for filtering the effluent from the fluidized bed of alumina.
Claim 16
Dependent Claim
82 words
The combination according to claim 13 further comprising: a. A heat exchanger for cooling effluent from the fluidized bed; b. first duct means for directing a first portion of the cooled efFluent into the area above the cell enclosed by said hood for recycling through said fluidized bed of alumina; c. second duct means for directing a second portion of the cooled effluent to said filter mean; and d. suction producing means for drawing effluent through the fluidized bed and heat exchanger.
Claim 17
Dependent Claim
37 words
The combination according to claim 14 further comprising: a. means for feeding alumina from said filter means to said fluidized bed of alumina; and b. means for feeding alumina from said fluidized bed and into said cell.
Claim 18
Dependent Claim
75 words
The combination with a cell for the electrolytic reduction of aluminum from fluoride fusions which comprises: a. a hood enclosing the upper part of the cell for collecting effluent from the cell; b. support means for carrying a bed of alumina in a fluidized state, said support means including a storage receptacle disposed above said hood with an outlet at its lower end in communication with the area enclosed by said hood, said receptacle including:
Claim 19
Dependent Claim
71 words
The combination according to claim 16 further comprising: a. an exhaust duct disposed above said bed and below said first support member for directing effluent from above said bed, out of said receptacle and toward said filter means; and b. first feed means for feeding alumina from said fluidized bed and into said cell; and c. second feed means for feeding alumina from said filter means to said supply of alumina.
Claim 20
Dependent Claim
73 words
The combination according to claim 17 further comprising a. a heat exchanged disposed in said exhaust duct for cooling effluent from said fluidized bed; b. a return duct for directing a first portion of the cooled effluent into the area above the cell enclosed by said hood for recycling through said fluidized bed of alumina; and c. an additional duct for directing a second portion of the cooled effluent to said filter means.
Claim 21
Dependent Claim
41 words
The combination according to claim 18 wherein: a. said passage means connecting said supply of alumina with said fluidized bed includes openings in the first support member along two opposite side walls of said receptacle; b. said first feed means includes:
Claim 22
Independent Claim
55 words
The method of treating effluent from an aluminum reduction cell during the electrolytic reduction of aluminum comprising the steps of: a. collecting the effluent from the cell; b. passing the effluent from the cell through a fluidized bed of alumina; and c. passing the effluent from the fluidized bed through a non-fluidized layer of alumina.
Claim 23
Dependent Claim
26 words
The method according to claim 20 including the step of: a. feeding the non-fluidized layer of alumina with the effluent contained therein to the fluidized bed.
Claim 24
Dependent Claim
82 words
The combination with a cell for the electrolytic reduction of aluminum from fluoride fusions which comprises: a. a hood enclosing the upper part of the cell for collecting effluent from the cell; b. support means for carrying a bed o alumina in a fluidized state; c. filter means for holding a layer of alumina in a non-fluidized state; and d. feed means fOr feeding effluent from said cell through the fluidized bed of alumina and then through the layer of non-fluidized alumina.
Claim 25
Independent Claim
134 words
The method of treating effluent from an aluminum reduction cell during the electrolytic reduction of aluminum comprising the steps of: a. collecting the effluent from the cell; b. passing the effluent from the cell through a fluidized bed of alumina, said effluent being passed upwardly through a bed of alumina at a rate sufficient to fluidize it; c. passing the effluent from the fluidized bed through a non-fluidized layer of alumina; d. feeding the alumina of both the non-fluidized layer and the fluidized bed with the effluent contained therein into the fusion of the aluminum reduction cell; e. cooling the effluent from the fluidized bed; f. recycling a first portion of the cooled effluent through the fluidized bed; and g. passing a second portion of the cooled effluent through said non-fluidized layer of alumina.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |