EP0187730B1 - Dispositif à lit fluidisé pour la séparation continue de deux phases solides mélangées - Google Patents

Dispositif à lit fluidisé pour la séparation continue de deux phases solides mélangées Download PDF

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Publication number
EP0187730B1
EP0187730B1 EP86420003A EP86420003A EP0187730B1 EP 0187730 B1 EP0187730 B1 EP 0187730B1 EP 86420003 A EP86420003 A EP 86420003A EP 86420003 A EP86420003 A EP 86420003A EP 0187730 B1 EP0187730 B1 EP 0187730B1
Authority
EP
European Patent Office
Prior art keywords
vibration
fluidisation
alumina
fluidized
porous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86420003A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0187730A2 (fr
EP0187730A3 (en
Inventor
Jean-Pascal Hanrot
Jacky Volpeliere
André Pitour
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rio Tinto France SAS
Original Assignee
Aluminium Pechiney SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Aluminium Pechiney SA filed Critical Aluminium Pechiney SA
Publication of EP0187730A2 publication Critical patent/EP0187730A2/fr
Publication of EP0187730A3 publication Critical patent/EP0187730A3/fr
Application granted granted Critical
Publication of EP0187730B1 publication Critical patent/EP0187730B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B4/00—Separating by pneumatic tables or by pneumatic jigs
    • B03B4/02—Separating by pneumatic tables or by pneumatic jigs using swinging or shaking tables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/06—Feeding or discharging arrangements
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/14—Devices for feeding or crust breaking

Definitions

  • the invention relates to a device for separating, in a fluidized bed, two mixed solid phases, one of which is formed of pulverizable fluidizable materials, while the other is made of non-fluidizable materials under the fluidization conditions of the first.
  • fluidizable materials are meant all the materials well known to those skilled in the art, being in powder form and of particle size and cohesion such that the speed of passage of the blown air causes, at low speed , the decohesion of the particles between them and the reduction of the internal friction forces.
  • materials are, for example, alumina intended for igneous electrolysis, cements, plasters, lime (quick or slaked), fly ash, calcium fluoride, fillers for rubber; starch, catalysts, coal dust, sodium sulphate, phosphates, pyrophosphates, plastic materials in the form of powder, food products such as milk powder, flours, etc.
  • This device which is proposed for transporting alumina from a storage area up to a consumption area first comprises a primary fluidized bed conveyor, provided with means for supplying and discharging the gas used to permanently fluidize the alumina and maintain said primary conveyor essentially full of fluidized materials, then comprises a plurality of secondary fluidized bed conveyors, provided with the same means for supplying and evacuating the fluidization gas, receiving and transporting pulverulent materials coming from the primary conveyor while maintaining them in the same state permanent fluidization than in the primary conveyor, finally comprises devices for discontinuous supply of pulverulent materials to each electrolysis tank.
  • the object of the invention is therefore a device for separating in a fluidized bed two mixed solid phases, one of the phases of which is formed of pulverizable fluidizable materials while the other phase consists of agglomerated materials which cannot be fluidized under the conditions of fluidization of the first.
  • the means for introducing the mixture of the two solid phases to be separated at regular rate can be placed at any point on the upper face of the device. However, it is desirable that this means is located on the side opposite to the evacuation of the fluidized solid phase.
  • the overflow allowing the fluidized solid phase to be discharged by overflow is provided with flexible means of connection to the fixed downstream transport circuit. It can be, for example, a corrugated rubber sleeve.
  • a periodic vibration is communicated to the porous fluidization wall.
  • This periodic vibration can be produced by any source known to a person skilled in the art, such as, for example, mechanical, pneumatic, electromagnetic, hydraulic, etc., controlled for example by a sequential and adjustable time delay means allowing the starting of the vibrating source at regular intervals and for a determined duration.
  • the operating time of the vibrating source is between 1 and 3 minutes at a rate of 2 to 4 times per hour.
  • this vibration must be oriented in the direction of evacuation of the decanted solid phase, that is to say in the opposite direction to that of the fluidized phase; it must also have a vertical component directed upwards therefore a result inclined with respect to the plane of the porous fluidization wall.
  • the axis of vibration preferably passes through the center of gravity of the device, and has an inclination ⁇ , relative to the vertical which can be fixed from 0 to 70 'without however that this value constitutes an absolute limit of the invention, values between 20 and 60 ° being chosen, in practice, with a preference for a value of ⁇ close to 45 °.
  • the non-fluidized phase, or decanted phase, under the effect of the periodic and oriented vibration progresses in the opposite direction to that of the fluidized phase, on the porous wall kept horizontal or substantially horizontal.
  • This horizontality is indeed necessary in order not to modify the homogeneous distribution of the decanted phase on the porous wall and consequently not to disturb the fluidization conditions.
  • a deviation of less than 3 degrees from the horizontal is acceptable.
  • the decanted phase even if it is small, cannot accumulate for a long time in the caisson at the end of its progression in the direction opposite to that of the fluidized phase. It must therefore be periodically removed from the box and recovered by means which do not significantly disturb the fluidization of the other phase, and which will be described a little later.
  • This storage capacity of the decanted solid phase which is, for example, constituted by a cylindrical or polyhedral column, can itself be provided with a fluidization means, the porous fluidization wall being horizontal or substantially horizontal.
  • the storage capacity of the decanted solid phase when it exists is also provided with a means of periodic extraction of said phase, making it possible to isolate said capacity, but also the fluidized bed of the separation device, while this device is in operating condition.
  • a means of periodic extraction of said phase can be, for example, an airlock, or any other equivalent means known to those skilled in the art.
  • the fluidized bed device for separating the two solid phases comprises a lower box (1) with gas circulation, an upper box (2) with circulation of fluidized pulverulent materials, a porous fluidization wall (3), a intake manifold (4) for the fluidization gas and an outlet manifold (5) for the fluidization gas from the upper casing.
  • the upper box (2) is also provided with means (not shown) for introducing the mixture of the two solid phases to be separated at a regular flow rate, by the tube (6), associated with a flexible cuff (8).
  • overflow (7) which makes it possible to conduct the fluidized material out of the separation device.
  • the overflow (7) is likewise provided with a flexible sleeve (8a) allowing the connection of the separation device to the fixed downstream transport circuit (not represented).
  • Oriented vibrating means, represented by the arrow (9), provides the porous fluidization wall with vibration oriented in the opposite direction to the movement of the fluidized material which is represented by the arrow (10). This vibration causes the decanted solid phase to migrate in the direction of the arrow (11).
  • a partition (12) comprising, at its base, at the porous wall (3), an opening (13) of length substantially equal to the width of the porous wall (3), and the height of which must be adapted to the size of the largest grains of the decanted phase.
  • This opening (13) may include a controlled closure means, symbolically represented by the needle (13A). This needle being open or absent, the decanted solid phase, inevitably accompanied by a certain quantity of pulverized fluidized material, comes to accumulate in the capacity (14).
  • the partition (12) further comprises, at its upper part, an opening (18) allowing the evacuation of the fluidizing air towards the upper box (2).
  • the capacity (14) is provided, in the case of the figure, an airlock (15) delimited by the valves (16) and (17), and a flexible flexible seal (8b).
  • the opening of the valve (16) makes it possible to place in the airlock (15) the decanted solid phase to be eliminated. Then, the closing of the valve (16) and the opening of the valve (17) ensure the evacuation of said solid phase, without the operation of the device for continuously separating the two solid phases being disturbed.
  • the capacity (14) is provided at its base with a fluidization means (not shown), it may be advantageous for the oblique face to be provided with an opening (18) allowing the circulating fluidization gas from bottom to top in the capacity (14) to escape through the upper box (2).
  • the decanted solid phase is discharged by the periodic opening of the orifice (13) under the action of the control means (13a), the solid phase then being collected in a container or any container.
  • the device according to the invention is suspended by the elastic means (19) thus making it subject to vibration (9).
  • alumina to igneous electrolysis tanks for the production of aluminum according to the Hall-Héroult process, comprising conveying the alumina in a fluidized bed from a storage zone to at least one consumption zone , using the device according to the invention, the separation in a fluidized bed of two mixed solid phases, one consisting of alumina, the other, of materials which cannot be fluidized under the fluidization conditions of the first , ie alumina agglomerates ("scrapes").
  • the device according to the invention has been installed upstream of the fluidized bed alumina conveyor so that only the fluidized solid phase is transferred by said conveyor to the electrolysis cells, while the other solid phase having decanted , was eliminated from the transport installation before it disturbed the proper functioning of the fluidized bed conveyors.
  • the device according to the invention had a length of 3 meters and a width of 60 cm.
  • the lower box (1) had a height of 10 cm while the upper box (2) for circulation of the pulverized fluidized materials had a height of 45 cm.
  • the porous fluidization wall (3) had a surface of 1.4 m2.
  • the pressure of the fluidizing gas in the box being 600 mm of CE (5880 Pa), while the cumulative flow of said gas was 2 Nm3 / min.
  • the device according to the invention was supplied with a mixture of solid phases (alumina and agglomerates) in a regular manner at the rate of 6 tonnes per hour.
  • the oriented vibration was produced by an unbalance vibrator, according to arrow (9).
  • the angle of the axis of emission of the vibration with the horizontal plane was 45 degrees.
  • the frequency of the vibration was 1500 cycles per minute and its amplitude 4 mm.
  • the emission of the vibration was practiced for 2 minutes, at the rate of 2 times per hour.
  • the installation operated continuously for 6 months. During this time, 26,000 tonnes of alumina were treated in the device according to the invention, of which was able to remove 5100 kg of the decanted solid phase through the opening (13), or approximately 0.2 kg of decanted solid phase on average and eliminated per tonne of alumina.
  • the fluidized device for supplying the alumina electrolysis tanks did not undergo any disturbance due to "grattons" and other undesirable agglomerates.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Credit Cards Or The Like (AREA)
  • Organic Insulating Materials (AREA)
EP86420003A 1985-01-08 1986-01-06 Dispositif à lit fluidisé pour la séparation continue de deux phases solides mélangées Expired - Lifetime EP0187730B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8500468 1985-01-08
FR8500468A FR2575680B1 (fr) 1985-01-08 1985-01-08 Dispositif a lit fluidise pour la separation continue de deux phases solides melangees

Publications (3)

Publication Number Publication Date
EP0187730A2 EP0187730A2 (fr) 1986-07-16
EP0187730A3 EP0187730A3 (en) 1989-05-03
EP0187730B1 true EP0187730B1 (fr) 1991-11-27

Family

ID=9315254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86420003A Expired - Lifetime EP0187730B1 (fr) 1985-01-08 1986-01-06 Dispositif à lit fluidisé pour la séparation continue de deux phases solides mélangées

Country Status (19)

Country Link
US (1) US4741443A (xx)
EP (1) EP0187730B1 (xx)
JP (1) JPH0611432B2 (xx)
CN (1) CN1005460B (xx)
AU (1) AU576043B2 (xx)
BR (1) BR8600027A (xx)
CA (1) CA1291968C (xx)
DE (1) DE3682594D1 (xx)
EG (1) EG17836A (xx)
ES (1) ES8705256A1 (xx)
FR (1) FR2575680B1 (xx)
GR (1) GR860026B (xx)
HU (1) HU196918B (xx)
IE (1) IE58687B1 (xx)
MX (1) MX166710B (xx)
NO (1) NO167263C (xx)
NZ (1) NZ214719A (xx)
YU (1) YU44020B (xx)
ZA (1) ZA86107B (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008021346A1 (de) 2008-03-26 2009-10-01 Akw Apparate + Verfahren Gmbh Vorrichtung und Verfahren zur trennscharfen, trockenen Dichtesortierung von fluidisierbaren Materialien

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DE3719288A1 (de) * 1987-06-10 1988-12-22 Foerder & Anlagentechnik Gmbh Verfahren und anordnung zum trennen von schuettguetern unterschiedlichen spezifischen gewichtes
JPS6480477A (en) * 1987-09-21 1989-03-27 Agency Ind Science Techn Method for separating unburned charcoal in coal ash
US4946044A (en) * 1988-05-18 1990-08-07 Kennedy Van Saup Corporation Aeration separator
US5071541A (en) * 1988-09-30 1991-12-10 The Boeing Company Method and apparatus for sorting a mixture of particles
US5118409A (en) * 1989-06-28 1992-06-02 Sddm, Inc. Apparatus and method for improving density uniformity of a fluidized bed medium, and/or for improving material fluidized bed sorting
US5048693A (en) * 1989-06-28 1991-09-17 World Agrosearch, Ltd. Method and apparatus for sorting articles with small density differences utilizing a flotation stream
FR2671061A1 (fr) * 1990-12-26 1992-07-03 Pechiney Aluminium Dispositif de separation d'une matiere en lit fluidise et de detection de colmatage.
NO174147C (no) * 1991-03-25 1994-03-23 Norsk Hydro As Anordning for automatisk nivåkontroll i en lukket renne eller beholder for transport og/eller fordeling av fluidiserbart materiale
US5299692A (en) * 1993-02-03 1994-04-05 Jtm Industries, Inc. Method and apparatus for reducing carbon content in particulate mixtures
CN1046102C (zh) * 1993-02-15 1999-11-03 中国矿业大学 振动流化床细粒煤干式分选方法及装置
NO177090C (no) * 1993-03-15 1995-07-19 Norsk Hydro As Separator for utskilling av fluidiserbare og ikke fluidiserbare materialer
US5669509A (en) * 1996-02-28 1997-09-23 Kerr-Mcgee Chemical Corporation Dry separation of fine powder from coarse contaminant in a vibrating fluid bed
AU3390197A (en) * 1996-05-29 1998-01-07 Kerr-Mcgee Chemical L.L.C. Dry separation of fine powder from coarse contaminant in a vibrating fluid bed
FR2778393B1 (fr) * 1998-05-11 2000-06-16 Pechiney Aluminium Procede pour le convoyage en lit hyperdense de materiaux pulverulents et dispositif a fluidisation potentielle destine a le mettre en oeuvre
FR2779136B1 (fr) 1998-06-02 2000-07-28 Pechiney Aluminium Procede de convoyage en phase hyperdense de materiaux pulverulents applicable au contournement d'obstacles
US6907996B1 (en) * 2000-07-20 2005-06-21 Arthur P. Fraas Application of complex-mode vibration-fluidized beds to the separation of granular materials of different density
NO20011231L (no) * 2001-03-09 2002-09-10 Norsk Hydro As Fremgangsmåte og anordning for separering av fraksjoner i en materialström
NO315037B1 (no) * 2001-03-21 2003-06-30 Norsk Hydro As Fremgangsmåte og system for distribusjon av fluidiserbare materialer
JP4261877B2 (ja) * 2002-11-11 2009-04-30 株式会社高見沢サイバネティックス 硬貨処理装置
CN102728555B (zh) * 2011-04-11 2015-09-30 王仲武 一种干选富集分离方法及用于干选富集分离方法的系统
US9500051B2 (en) * 2012-08-10 2016-11-22 Halliburton Energy Services, Inc. Method and apparatus for drilling and completion fluid separation
JP6733254B2 (ja) * 2016-03-28 2020-07-29 三菱マテリアル株式会社 フライアッシュの製造方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008021346A1 (de) 2008-03-26 2009-10-01 Akw Apparate + Verfahren Gmbh Vorrichtung und Verfahren zur trennscharfen, trockenen Dichtesortierung von fluidisierbaren Materialien

Also Published As

Publication number Publication date
NO855220L (no) 1986-07-09
CN1005460B (zh) 1989-10-18
JPS61164687A (ja) 1986-07-25
EG17836A (en) 1991-06-30
ES550700A0 (es) 1987-05-01
NO167263B (no) 1991-07-15
FR2575680A1 (fr) 1986-07-11
HUT43350A (en) 1987-10-28
HU196918B (en) 1989-02-28
JPH0611432B2 (ja) 1994-02-16
EP0187730A2 (fr) 1986-07-16
NZ214719A (en) 1988-04-29
AU576043B2 (en) 1988-08-11
CA1291968C (fr) 1991-11-12
EP0187730A3 (en) 1989-05-03
ZA86107B (en) 1986-10-29
US4741443A (en) 1988-05-03
AU5188586A (en) 1986-07-17
IE58687B1 (en) 1993-11-03
DE3682594D1 (de) 1992-01-09
GR860026B (en) 1986-06-24
YU44020B (en) 1990-02-28
IE860033L (en) 1986-07-08
ES8705256A1 (es) 1987-05-01
NO167263C (no) 1991-10-23
BR8600027A (pt) 1986-09-23
YU206685A (en) 1988-04-30
FR2575680B1 (fr) 1987-07-03
MX166710B (es) 1993-01-29
CN86100050A (zh) 1986-07-02

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