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WO1996036563A1 - Procede et appareil de fabrication de l'alumine de haute qualite a partir de fines d'oxyde d'aluminium de qualite inferieure - Google Patents

Procede et appareil de fabrication de l'alumine de haute qualite a partir de fines d'oxyde d'aluminium de qualite inferieure Download PDF

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Publication number
WO1996036563A1
WO1996036563A1 PCT/US1996/007172 US9607172W WO9636563A1 WO 1996036563 A1 WO1996036563 A1 WO 1996036563A1 US 9607172 W US9607172 W US 9607172W WO 9636563 A1 WO9636563 A1 WO 9636563A1
Authority
WO
WIPO (PCT)
Prior art keywords
fines
alumina
grade
treatment chamber
plasma
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.)
Ceased
Application number
PCT/US1996/007172
Other languages
English (en)
Other versions
WO1996036563B1 (fr
Inventor
Ronald Paul Zapletal
Ronald Lee Bell
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.)
ALUCHEM Inc
Original Assignee
ALUCHEM Inc
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
Application filed by ALUCHEM Inc filed Critical ALUCHEM Inc
Priority to AU60227/96A priority Critical patent/AU6022796A/en
Publication of WO1996036563A1 publication Critical patent/WO1996036563A1/fr
Publication of WO1996036563B1 publication Critical patent/WO1996036563B1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
    • F27B7/38—Arrangements of cooling devices
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
    • C01F7/441—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
    • C01F7/441—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination
    • C01F7/444—Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/12—Surface area
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
    • F27B7/32—Arrangement of devices for charging
    • F27B7/3205—Charging
    • F27B2007/3211—Charging at the open end of the drum
    • F27B2007/3217—Charging at the open end of the drum axially, optionally at some distance in the kiln
    • F27B2007/3241—Charging at the open end of the drum axially, optionally at some distance in the kiln in the flame of the burner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0006—Electric heating elements or system
    • F27D2099/0031—Plasma-torch heating

Definitions

  • the present invention relates to method and apparatus for
  • Hydrated alumina also referred to as alumina trihydrate or
  • AI 2 O 3 -3H 2 is obtained by high-temperature digestion of host bauxite
  • the hydrated alumina for aluminum metal manufacture.
  • the hydrated alumina for aluminum metal manufacture.
  • alpha alumina ⁇ -AI 2 0 3
  • calcined alpha alumina may be further treated in traditional arc-type
  • alumina product, calcination systems are provided with dust collectors, such as electrostatic precipitators, high-efficiency bag houses or the
  • alumina is characterized by a particle size below 44 microns and the
  • the captured fines generally have a high soda content. Furthermore, the captured fines generally comprise a mixture of particles calcined to varying
  • This method may reduce the overall productivity of the Bayer
  • the aluminum oxide dust is washed to reduce its sodium oxide
  • the aluminum oxide dust is likely to be suspended in
  • the dust in the heated air stream will typically reduce the amount of
  • Low-grade aluminum oxide fines contain chemically combined water of
  • the present invention is directed to method
  • the low-grade aluminum oxide fines are produced as a
  • novel plasma-fired rotary kiln having a rotating treatment
  • torch directs heat within the treatment chamber to calcine and convert low-grade aluminum oxide fines into intermediate and high alpha phase alumina particles within the chamber.
  • the treatment chamber of the rotary kiln includes an inlet
  • chamber is preferably inclined from outlet end to inlet end with the
  • a fossil fuel heater may typically have a combustible
  • a plasma torch may have a similar ratio in a range between 0.10: 1 and
  • plasma torches provide "massless heat" compared to
  • plasma torches may operate in a range between 4,000°C
  • fossil fuel heaters may operate in the range between 1 ,500°C and 2,000°C.
  • the plasma-fired rotary kiln provides improved calcination of the aluminum oxide fines
  • alumina are preferably washed with an acidic aqueous medium selected
  • the washed fines are calcined during passage through the rotating
  • the treatment chamber rotates at a speed and the plasma torch
  • the high-grade alumina particles are ground to achieve a
  • a novel plasma-fired reactor having a fixed treatment
  • the plasma torch directs heat from a plasma arc flame within the treatment
  • the fines are mixed with a carrier gas
  • reactor of the present invention has essentially little or negligible heated
  • the plasma-fired reactor provides
  • the plasma torch is not adversely affected by
  • the plasma-fired reactor permits the ESP dust by-
  • Fig. 1 is a cross-sectional view of a plasma-fired rotary kiln in accordance with one embodiment of the present invention.
  • Fig. 2 is a cross-sectional view of a plasma-fired reactor
  • the present invention relates to method and apparatus for
  • electrostatic precipitator high-efficiency bag house, cyclone separator
  • low-grade aluminum oxide fines refers to fines
  • high-grade alumina refers to alumina comprising
  • Agglomerating refers to forming a coherent mass of alumina particles (loose or hard agglomerates) by heating the low-grade aluminum oxide
  • the rotating kiln 1 6 is provided with an inlet end 22 for
  • volumetric screw feeder 24 includes a feed-pipe 29 extending into the
  • volumetric screw feeder predetermined rate. It will be appreciated that volumetric screw feeder
  • the rotating kiln 1 6 includes a rotating treatment chamber
  • the rotating kiln 1 6 is inclined as shown in Fig. 1 to facilitate travel of the fines 1 2 through
  • the treatment chamber 30 and includes a nose ring dam 33 for
  • the rotating treatment chamber 30 includes a series of
  • inwardly directed vanes 34 (shown in phantom) for cascading the low-
  • vanes or similar devices may not be necessary.
  • a non-transferred plasma torch 36 is mounted on a sealed end 38a of the rotating kiln 1 6 for
  • chamber 30 is rotatably mounted within sealed end 38a through
  • the plasma torch 36 of the present invention is preferably
  • the treatment chamber 30 is rotated
  • the fines are
  • the aqueous solution preferably washed with an aqueous solution.
  • the aqueous solution preferably washed with an aqueous solution.
  • aqueous medium is acidic and is preferably selected from a group
  • the washed fines are then separated from the aqueous solution through filtration, cycloning, centrifuging or decanting, for example, whereby the sodium oxide content of the fines is preferably
  • the washed fines preferably have a
  • the washed fines are introduced into the inlet end 22 of
  • the fines reach a temperature in a range between about
  • the fines are maintained in the rolling bed 35 as the fines
  • the fines are cascaded at the
  • the treatment chamber 34 In accordance with the method, the
  • treatment chamber 30 is rotated at a speed and the plasma torch 36 is
  • plasma-fired rotary kiln 1 0 are further illustrated.
  • EXAMPLE I A plasma-fired rotary kiln comprising a rotating kiln having a length of 5'6" and an inner diameter of 30" was constructed with an 8" refractory (high alumina) lining as shown in the figure. A 150 kW
  • plasma torch manufactured by Plasma Energy Corporation was mounted at the outlet end of the rotating kiln to direct heat toward the inlet end of the kiln (counter-current flow).
  • the rotating kiln was inclined at about 3° from outlet to inlet end and supported on a variable-speed drive mechanism.
  • a variable-speed volumetric screw feeder was used to introduce unwashed ESP dust by-product, captured during calcination of hydrated alumina into metallurgical grade alumina, into the inlet end of the rotary kiln at about 0.5 lbs. /min. through a 2" feed ⁇ pipe.
  • the unwashed ESP dust had a sodium oxide content of about 0.8% by weight and a free moisture content of less than about
  • ESP dust 0.5% by weight.
  • About 99% by weight of the ESP dust was characterized by a particle size below 44 microns.
  • a mineralizing agent comprising about 0.1 % AIF 3 was added to the ESP dust before being introduced into the inlet end of the rotary kiln.
  • the kiln was rotated at about 3 RPM and the plasma torch was employed to achieve a material bed temperature at about 2,650°F while the ESP dust was introduced into the inlet end of the rotary kiln.
  • the ESP dust was calcined in a rolling bed within the rotary kiln at these operating parameters. It was observed that the alumina particles discharged at the outlet end of the kiln had a surface area between about 0.3 and about 0.7 m 2 /g and
  • a mineralizing agent comprising
  • the kiln was rotated at about 3 RPM and the plasma torch
  • the outlet end of the kiln had a surface area between about 0.3 and
  • oxide fines into high-grade alumina shown generally at 52.
  • the high-grade alumina 52 may
  • calcined alpha alumina particles comprise calcined alpha alumina particles, alumina agglomerates, or
  • fused alumina preferably chemical grade "white” fused alumina
  • Reactor 50 includes a cylindrical treatment chamber 54,
  • the treatment chamber 54 is provided with an inlet end
  • the treatment chamber 54 has an alumina "skull" or
  • refractory lining 66 of generally uniform thickness for maintaining
  • the plasma-fired reactor 50 is inclined from the outlet end 62 to
  • reactor 50 is arranged vertically with the outlet end 62 located beneath the inlet end 58.
  • a non-transferred plasma torch 68 is mounted on a plasma
  • torch head 70 arranged at one end of the reactor 50 for directing heat within the treatment chamber 54 from a plasma arc flame 72.
  • plasma arc gas 74 preferably comprising natural gas, is fed into the
  • the reactor 50 is vented at the inlet end 58 to allow a very small
  • the reactor 50 has a sealed
  • exhaust port 80 is provided to transfer the entrained fines in the
  • heated exhaust from the treatment chamber 54 is preferably treated
  • the discharge port 82 is provided to permit the converted high- grade alumina 52 to exit the treatment chamber 54 as calcined alpha
  • alumina particles alumina particles, alumina agglomerates, or fused alumina as will be
  • the high-grade alumina 52 may
  • aluminum oxide fines are injected into the plasma torch 68 from a feed line 92 extending from the volumetric screw feeder 60.
  • a carrier gas
  • the aspirated fines are introduced into the inlet end 58 of
  • the fines are introduced directly into the inlet end 58 of the treatment chamber
  • plasma-fired reactor 50 may be arranged at an incline from the outlet
  • inlet ends 62 and 58 may be arranged vertically
  • alumina i.e., calcined alpha alumina particles, alumina
  • agglomerates, orfused alumina can be selectively controlled by varying
  • the plasma torch 68 operates at a
  • Conversion of the fines within the plasma-fired reactor 50 comprises
  • the fines may be introduced directly into the inlet
  • the mixed or unmixed fines may be
  • the fines are preferably washed with an aqueous solution.
  • the aqueous medium is acidic and is preferably
  • washing includes spraying or percolating the fines with the aqueous
  • the washed fines are then separated from the aqueous
  • the sodium oxide content of the fines is preferably reduced to a range selected from a group consisting of between about
  • the washed fines preferably have a
  • the washed fines are introduced into the inlet end 58 of the treatment
  • fines preferably reach a temperature in a range between about 1 ,800°C
  • the low-grade aluminum oxide fines are introduced into the low-grade aluminum oxide fines.
  • the amount of crystallization is controlled by regulating, through air balance and temperature within the treatment chamber 54, the
  • present invention provides efficient and technically feasible method
  • the ESP dust is converted into calcined high-grade
  • alumina particles alumina particles, alumina agglomerates, or fused alumina within the
  • the present invention provides

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

L'invention concerne un procédé et un appareil de fabrication de l'alumine de haute qualité à partir des fines d'oxyde d'aluminium de qualité inférieure obtenues comme produit secondaire lors de la calcination de l'alumine hydratée visant à obtenir une alumine de qualité métallurgique ou une alumine spéciale. Une forme d'exécution concerne un four rotatif à plasma (10) ayant une chambre de traitement rotative (30) et une torche à plasma (36) disposée dans la chambre (30) pour convertir les fines d'oxyde d'aluminium de qualité inférieure (12) en particules d'alumine de haute qualité (14) dans la chambre de traitement (30). Une autre forme d'exécution concerne un réacteur à plasma (50) ayant une chambre de traitement (54) et une torche à plasma (68) disposée dans la chambre pour convertir les fines d'oxyde d'aluminium de qualité inférieure en alumine calcinée de haute qualité, sous la forme de particules d'alumine, d'alumine agglomérée ou d'alumine vitreuse. Le procédé consiste à introduire des fines d'oxyde d'aluminium de qualité inférieure dans le réacteur à plasma (50) et à traiter les fines par la chaleur produite par la torche à plasma (68) pour convertir les fines en alumine de haute qualité (52). L'invention concerne également un procédé de fabrication d'une alumine de haute qualité avec une teneur réduite en oxyde de sodium à partir de fines d'oxyde d'aluminium de qualité inférieure.
PCT/US1996/007172 1995-05-17 1996-05-17 Procede et appareil de fabrication de l'alumine de haute qualite a partir de fines d'oxyde d'aluminium de qualite inferieure Ceased WO1996036563A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU60227/96A AU6022796A (en) 1995-05-17 1996-05-17 Method and apparatus for making high-grade alumina from low- grade aluminum oxide fines

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US44360095A 1995-05-17 1995-05-17
US08/443,600 1995-05-17
US62284696A 1996-03-27 1996-03-27
US08/622,846 1996-03-27

Publications (2)

Publication Number Publication Date
WO1996036563A1 true WO1996036563A1 (fr) 1996-11-21
WO1996036563B1 WO1996036563B1 (fr) 1997-01-16

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Country Status (2)

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AU (1) AU6022796A (fr)
WO (1) WO1996036563A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005118480A1 (fr) * 2004-06-01 2005-12-15 Atraverda Limited Reactions chimiques a humidite reduite
WO2006106443A3 (fr) * 2005-04-06 2006-11-30 Ffe Minerals Denmark As Procede et installation de fabrication de l'alumine
RU2294896C1 (ru) * 2005-07-13 2007-03-10 Открытое акционерное общество "Проектно-конструкторское бюро металлургической теплотехники и энерготехнологии цветной металлургии" (ОАО "ПКБ "Энергоцветмет") Способ, реактор и установка для термообработки порошкообразного материала
WO2014186478A3 (fr) * 2013-05-16 2015-04-02 Scientific Design Company, Inc. Traitement du support pour améliorer la performance catalytique d'un catalyseur d'oxyde d'éthylène
CN113600101A (zh) * 2021-08-17 2021-11-05 任立民 一种焙烧反应生成器及纳米氧化铝生产方法
WO2022095264A1 (fr) * 2020-11-06 2022-05-12 太原理工大学 Méthode et dispositif d'élimination de matière organique de bauxite

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1081584A (fr) * 1952-07-24 1954-12-21 Godfrey L Cabot Procédé et dispositif pour le traitement de matières solides finement divisées
GB881485A (en) * 1959-06-13 1961-11-01 Camag Chemie Process for the regeneration of adsorptively active aluminium oxide
FR2124840A5 (en) * 1971-01-28 1972-09-22 Kloeckner Humboldt Deutz Ag Alumina calcining plant feed - employing a hot gas feed conveyor
DE3730947A1 (de) * 1987-07-17 1989-01-26 Espanola Alumina Sa Verfahren zum erzeugen eines speziellen aluminiumoxids aus dem beim kalzinieren von metallurgischem aluminiumoxid anfallenden, feinen pulver
DE4124581A1 (de) * 1991-07-24 1993-01-28 Lonza Ag Verfahren zur kalzination von tonerde mit geringem natriumoxid-gehalt

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1081584A (fr) * 1952-07-24 1954-12-21 Godfrey L Cabot Procédé et dispositif pour le traitement de matières solides finement divisées
GB881485A (en) * 1959-06-13 1961-11-01 Camag Chemie Process for the regeneration of adsorptively active aluminium oxide
FR2124840A5 (en) * 1971-01-28 1972-09-22 Kloeckner Humboldt Deutz Ag Alumina calcining plant feed - employing a hot gas feed conveyor
DE3730947A1 (de) * 1987-07-17 1989-01-26 Espanola Alumina Sa Verfahren zum erzeugen eines speziellen aluminiumoxids aus dem beim kalzinieren von metallurgischem aluminiumoxid anfallenden, feinen pulver
DE4124581A1 (de) * 1991-07-24 1993-01-28 Lonza Ag Verfahren zur kalzination von tonerde mit geringem natriumoxid-gehalt

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
R. PAROSA ET AL.: "Calcination of aluminium hydroxide in a random-expanded plasma reactor.", 4TH ANNUAL INT CONF PLASMA CHEM TECHNOL, 1987, 1989, TECHNOMIC PUBL, LANCASTER, pages 189 - 191, XP000603318 *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2375298C2 (ru) * 2004-06-01 2009-12-10 Атраверда Лимитед Химические реакции со сниженным содержанием влаги
GB2431636A (en) * 2004-06-01 2007-05-02 Atraverda Ltd Reduced Moisture Chemical Reactions
JP2008500939A (ja) * 2004-06-01 2008-01-17 アトラバーダ リミテッド 水分が低減された化学反応
US20120328507A1 (en) * 2004-06-01 2012-12-27 Andrew Hill Reduced moisture chemical reactions
WO2005118480A1 (fr) * 2004-06-01 2005-12-15 Atraverda Limited Reactions chimiques a humidite reduite
WO2006106443A3 (fr) * 2005-04-06 2006-11-30 Ffe Minerals Denmark As Procede et installation de fabrication de l'alumine
RU2294896C1 (ru) * 2005-07-13 2007-03-10 Открытое акционерное общество "Проектно-конструкторское бюро металлургической теплотехники и энерготехнологии цветной металлургии" (ОАО "ПКБ "Энергоцветмет") Способ, реактор и установка для термообработки порошкообразного материала
RU2294896C9 (ru) * 2005-07-13 2007-06-27 Открытое акционерное общество "Проектно-конструкторское бюро металлургической теплотехники и энерготехнологии цветной металлургии" (ОАО "ПКБ "Энергоцветмет") Способ, реактор и установка для термообработки порошкообразного материала
US9758498B2 (en) 2013-05-16 2017-09-12 Scientific Design Company, Inc. Carrier treatment to improve catalytic performance of an ethylene oxide catalyst
US9095843B2 (en) 2013-05-16 2015-08-04 Scientific Design Company, Inc. Carrier treatment to improve catalytic performance of an ethylene oxide catalyst
US10669247B2 (en) 2013-05-16 2020-06-02 Scientific Design Company, Inc. Carrier treatment to improve catalytic performance of an ethylene oxide catalyst
WO2014186478A3 (fr) * 2013-05-16 2015-04-02 Scientific Design Company, Inc. Traitement du support pour améliorer la performance catalytique d'un catalyseur d'oxyde d'éthylène
WO2022095264A1 (fr) * 2020-11-06 2022-05-12 太原理工大学 Méthode et dispositif d'élimination de matière organique de bauxite
CN113600101A (zh) * 2021-08-17 2021-11-05 任立民 一种焙烧反应生成器及纳米氧化铝生产方法

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Publication number Publication date
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