GB1045216A - Improvements in or relating to the precipitation of alumina - Google Patents
Improvements in or relating to the precipitation of aluminaInfo
- Publication number
- GB1045216A GB1045216A GB15475/64A GB1547564A GB1045216A GB 1045216 A GB1045216 A GB 1045216A GB 15475/64 A GB15475/64 A GB 15475/64A GB 1547564 A GB1547564 A GB 1547564A GB 1045216 A GB1045216 A GB 1045216A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stage
- alumina hydrate
- seed
- alumina
- precipitation
- 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
Classifications
-
- 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
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
- C01F7/144—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by precipitation due to cooling, e.g. as part of the Bayer process
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/51—Particles with a specific particle size distribution
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Alumina hydrate is prepared from pregnant sodium aluminate solution by first treating with a relatively coarse seed alumina hydrate, of which at least 75% will not pass through a 325 mesh (Tyler) screen, to precipitate a major proportion of the precipitatable alumina hydrate. Afterwards a relatively fine seed alumina hydrate, of which at least 60% passes through a 325 mesh screen, is added to complete the precipitation. The process may be carried out in two stages where the coarse-grained alumina obtained in the first stage is separated and the liquor passes to a second stage to precipitate the finer alumina hydrate. The second stage may be initiated when at least 85% of the alumina has precipitated. The fine grained alumina hydrate obtained in the second stage may be divided into two parts; the first part being used as seed in a subsequent stage and the remainder removed and treated with fresh sodium aluminate to coarsen the particles. The coarsened particles obtained may then be used as seed in the first stage precipitation. The molten liquor from the coarsening stage may be forwarded to the second precipitation stage for treatment with fine seed alumina hydrate. In an alternate embodiment, the fine seed alumina hydrate may be added to the depleted aluminate liquor of the first stage before separation of the coarse grained alumina hydrate.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US27830563A | 1963-05-06 | 1963-05-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1045216A true GB1045216A (en) | 1966-10-12 |
Family
ID=23064486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB15475/64A Expired GB1045216A (en) | 1963-05-06 | 1964-04-14 | Improvements in or relating to the precipitation of alumina |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH441251A (en) |
| GB (1) | GB1045216A (en) |
| NL (1) | NL6404751A (en) |
| OA (1) | OA00071A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2446799A1 (en) * | 1979-01-18 | 1980-08-14 | Aluminum Co Of America | PROCESS FOR PRECIPITATION OF ALUMINUM HYDROXIDE IN DENSE PHASE FROM A MOTHER LIQUOR OBTAINED ACCORDING TO THE BAYER PROCESS |
| FR2573414A1 (en) * | 1984-11-22 | 1986-05-23 | Pechiney Aluminium | METHOD FOR IMPLEMENTING TWO-STAGE BEGINNING FOR OBTAINING LARGE GRAIN ALUMINA |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5456999A (en) * | 1977-10-17 | 1979-05-08 | Nippon Light Metal Co | Preparation of crude alumina particles |
| JPS57140316A (en) * | 1981-02-20 | 1982-08-30 | Sumitomo Alum Smelt Co Ltd | Manufacture of coarse granular aluminum hydroxide |
-
1964
- 1964-04-14 GB GB15475/64A patent/GB1045216A/en not_active Expired
- 1964-04-29 NL NL6404751A patent/NL6404751A/xx unknown
- 1964-05-05 OA OA50097A patent/OA00071A/en unknown
- 1964-05-06 CH CH590664A patent/CH441251A/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2446799A1 (en) * | 1979-01-18 | 1980-08-14 | Aluminum Co Of America | PROCESS FOR PRECIPITATION OF ALUMINUM HYDROXIDE IN DENSE PHASE FROM A MOTHER LIQUOR OBTAINED ACCORDING TO THE BAYER PROCESS |
| FR2573414A1 (en) * | 1984-11-22 | 1986-05-23 | Pechiney Aluminium | METHOD FOR IMPLEMENTING TWO-STAGE BEGINNING FOR OBTAINING LARGE GRAIN ALUMINA |
| EP0184526A1 (en) * | 1984-11-22 | 1986-06-11 | Aluminium Pechiney | Process for the application of a two-step seeding to produce coarse alumina |
Also Published As
| Publication number | Publication date |
|---|---|
| NL6404751A (en) | 1964-11-09 |
| OA00071A (en) | 1966-01-15 |
| CH441251A (en) | 1967-08-15 |
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