GB781994A - Calcination of alumina hydrate - Google Patents
Calcination of alumina hydrateInfo
- Publication number
- GB781994A GB781994A GB4657/55A GB465755A GB781994A GB 781994 A GB781994 A GB 781994A GB 4657/55 A GB4657/55 A GB 4657/55A GB 465755 A GB465755 A GB 465755A GB 781994 A GB781994 A GB 781994A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bed
- cooling
- cooling bed
- fuel
- gas
- 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 3
- 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 6
- 239000000446 fuel Substances 0.000 abstract 3
- 239000007787 solid Substances 0.000 abstract 3
- 230000032683 aging Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000002156 mixing Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
Abstract
<PICT:0781994/III/1> <PICT:0781994/III/2> In a process for the fluidized calcination of finely divided alumina hydrate, said material is successively treated in at least three stages including at least one preheating bed A, B, a calcining bed C maintained e.g. at 1600 DEG to 1800 DEG F. by the combustion of fuel therein and a cooling bed D e.g. at 800 DEG to 1000 DEG F. through which a fluidizing gas also passes successively in the opposite direction and at least a part of the solids entrained in the gas discharging from the, or the initial, preheating bed is separated from said gas and transferred directly (via line 63) to the cooling bed. In Fig. 1, to which the above letters and numeral relate, heat is initially supplied to the reactor by means of torch 70 having fuel and air lines 71 and 72, but afterwards it is necessary only to supply fuel through one or several conduits 73 to the reaction zone. In the preferred embodiment (Fig. 2) the separated solids are returned to a portion 29a of the cooling bed (e.g. at a temperature of 1000-1300 DEG F.) confined by a baffle 75 having an opening 76 therein for passage of the solid to the remainder of the bed, where a temperature of 700 DEG to 1000 DEG F. may obtain, before cooling and discharge. Examples are given: in the first, temperatures of about 330 DEG , 690 DEG , 1700 DEG and 900 DEG F. obtain respectively in beds A, B, C and D and the product had a loss on ignition of 0.6 per cent and absorbs on ageing in a moist atmosphere, 2.4 per cent by weight of water; in the second example the temperatures were about 420 DEG , 800 DEG and 1800 DEG F. in beds A, B and C respectively and in a cooling bed having an area divided in the ratio 1:5, the smaller, mixing zone was at about 1300 DEG F. and the cooling bed proper at about 825 DEG F.
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 |
|---|---|
| GB781994A true GB781994A (en) | 1957-08-28 |
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 After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8614/58A Expired GB876597A (en) | 1954-02-17 | 1958-03-18 | Calcination of alumina |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR1203661A (en) |
| GB (2) | GB781994A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1184744B (en) * | 1959-10-28 | 1965-01-07 | Electro Chimie Metal | Process for the production of alpha-aluminum oxide from aluminum oxide hydrates |
| EP0009456A1 (en) * | 1978-09-21 | 1980-04-02 | Saint-Gobain Industries | Apparatus for the heat exchange between solid particles and a gas current |
| US4423558A (en) | 1978-09-21 | 1984-01-03 | St. Gobain Vitrage | Device for heat exchange between solid particles and a gas current |
| WO1999025884A1 (en) * | 1997-11-14 | 1999-05-27 | Treibacher Schleifmittel Ag | Method and unit for heat-treating fine-grained materials in a coarse-grained fluidized bed |
| 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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8803700U1 (en) * | 1988-03-18 | 1989-07-13 | Vereinigte Aluminium-Werke Ag, 1000 Berlin Und 5300 Bonn, De |
-
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 (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1184744B (en) * | 1959-10-28 | 1965-01-07 | Electro Chimie Metal | Process for the production of alpha-aluminum oxide from aluminum oxide hydrates |
| EP0009456A1 (en) * | 1978-09-21 | 1980-04-02 | Saint-Gobain Industries | Apparatus for the heat exchange between solid particles and a gas current |
| US4423558A (en) | 1978-09-21 | 1984-01-03 | St. Gobain Vitrage | Device for heat exchange between solid particles and a gas current |
| WO1999025884A1 (en) * | 1997-11-14 | 1999-05-27 | Treibacher Schleifmittel Ag | Method and unit for heat-treating fine-grained materials in a coarse-grained fluidized bed |
| US6811765B1 (en) * | 1997-11-14 | 2004-11-02 | Epion Corporation | Thermal treatment of fine grain materials in a coarse-grain fluidized bed |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| GB876597A (en) | 1961-09-06 |
| FR1203661A (en) | 1960-01-20 |
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