GB876597A - Calcination of alumina - Google Patents
Calcination of aluminaInfo
- 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
Links
- 238000001354 calcination Methods 0.000 title abstract 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title abstract 2
- 238000001816 cooling Methods 0.000 abstract 3
- 230000001419 dependent effect Effects 0.000 abstract 1
- 230000000994 depressogenic effect Effects 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
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)
- Geology (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (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.
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)
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)
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 |
-
1955
- 1955-02-16 GB GB4657/55A patent/GB781994A/en not_active Expired
-
1958
- 1958-03-18 GB GB8614/58A patent/GB876597A/en not_active Expired
- 1958-03-24 FR FR1203661D patent/FR1203661A/en not_active Expired
Cited By (1)
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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