GB876597A - Calcination of alumina - Google Patents

Calcination of alumina

Info

Publication number
GB876597A
GB876597A GB8614/58A GB861458A GB876597A GB 876597 A GB876597 A GB 876597A GB 8614/58 A GB8614/58 A GB 8614/58A GB 861458 A GB861458 A GB 861458A GB 876597 A GB876597 A GB 876597A
Authority
GB
United Kingdom
Prior art keywords
bed
valve
returned
fines
cyclone
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
Application number
GB8614/58A
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.)
Dorr Oliver Inc
Original Assignee
Dorr Oliver 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
Priority claimed from US648154A external-priority patent/US2867429A/en
Application filed by Dorr Oliver Inc filed Critical Dorr Oliver Inc
Publication of GB876597A publication Critical patent/GB876597A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting processes
    • C22B1/10—Roasting processes in fluidised form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
    • B01J6/001—Calcining
    • B01J6/004—Calcining using hot gas streams in which the material is moved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
    • B01J8/26—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with two or more fluidised beds, e.g. reactor and regeneration installations
    • B01J8/28—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with two or more fluidised beds, e.g. reactor and regeneration installations the one above the other
    • 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
    • C01F7/445—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination making use of a fluidised bed

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Materials Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Combustion & Propulsion (AREA)
  • Inorganic Chemistry (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

<PICT:0876597/III/1> In the fluidised calcination of alumina hydrate, the finely divided solid is fed successively into at least one preheating bed (19, 23) a calcining bed (26 maintained at about 1800 DEG F.) and a cooling bed (29) whilst fluidising gas passes in counter-flow, and entrained fines are separated from the final effluent gas (e.g. in a cyclone 61) and returned in part to the cooling bed (via conduit 64) and the remainder to the calcining bed (via conduit 66), the amount of fines returned to the cooling bed being such that the temperature is not depressed below 800 DEG F. The numerals relate to the Figure in which the operation is generally similar to that described in Specification 781,994 and in which the amount of fines returned to beds 26 and 29 is automatically controlled respectively by means of controllers 69 and 68, motors 80 and 79, and slide valves 67 and 65. The aperture of valve 65 is thus increased in accordance with the extent to which a thermocouple 78 indicates a temperature above 800 DEG F. in bed 20 and with the pressure differential between pressure taps 76 and 77; should the latter fall to below that which is sufficient to provide a gas seal between the fluidised bed 29 and the cyclone 61, the valve is shut off. Valve 67 is similarly dependent upon the pressure differential between pressure taps 75 and 76.
GB8614/58A 1954-02-17 1958-03-18 Calcination of alumina Expired GB876597A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US781994XA 1954-02-17 1954-02-17
US648154A US2867429A (en) 1957-03-25 1957-03-25 Calcination of alumina

Publications (1)

Publication Number Publication Date
GB876597A true GB876597A (en) 1961-09-06

Family

ID=26760223

Family Applications (2)

Application Number Title Priority Date Filing Date
GB4657/55A Expired GB781994A (en) 1954-02-17 1955-02-16 Calcination of alumina hydrate
GB8614/58A Expired GB876597A (en) 1954-02-17 1958-03-18 Calcination of alumina

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB4657/55A Expired GB781994A (en) 1954-02-17 1955-02-16 Calcination of alumina hydrate

Country Status (2)

Country Link
FR (1) FR1203661A (en)
GB (2) GB781994A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2215714A (en) * 1988-03-18 1989-09-27 Vaw Ver Aluminium Werke Ag Tubular reactor for the high-temperature decomposition of bauxite

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1248038A (en) * 1959-10-28 1960-12-09 Electrochimie Electrometallurg Anhydrous aluminas manufacturing process
FR2436953A1 (en) * 1978-09-21 1980-04-18 Saint Gobain THERMAL EXCHANGE DEVICE BETWEEN SOLID PARTICLES AND A GAS STREAM
US4423558A (en) 1978-09-21 1984-01-03 St. Gobain Vitrage Device for heat exchange between solid particles and a gas current
DE19750475C1 (en) * 1997-11-14 1999-04-08 Treibacher Schleifmittel Ag High temperature treatment of very small particles
CN114574712A (en) * 2022-03-14 2022-06-03 沈阳铝镁设计研究院有限公司 Roasting system and roasting process for reducing roasting temperature by adopting fluidized bed

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2215714A (en) * 1988-03-18 1989-09-27 Vaw Ver Aluminium Werke Ag Tubular reactor for the high-temperature decomposition of bauxite

Also Published As

Publication number Publication date
FR1203661A (en) 1960-01-20
GB781994A (en) 1957-08-28

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