GB799243A - Process for the production of alumina of high purity - Google Patents
Process for the production of alumina of high purityInfo
- Publication number
- GB799243A GB799243A GB29746/55A GB2974655A GB799243A GB 799243 A GB799243 A GB 799243A GB 29746/55 A GB29746/55 A GB 29746/55A GB 2974655 A GB2974655 A GB 2974655A GB 799243 A GB799243 A GB 799243A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alumina
- aluminium hydroxide
- hydroxide
- inoculant
- stage
- 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
- C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
- C01F7/47—Purification of aluminium oxide, aluminium hydroxide or aluminates of aluminates, e.g. removal of compounds of Si, Fe, Ga or of organic compounds from Bayer process liquors
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Pure aluminium hydroxide is obtained from sodium aluminate solutions containing suspended impurities such as iron, silicon and titanium oxides by precipitating a portion of aluminium hydroxide (which will contain the impurities), removing the precipitate, and precipitating the remainder of the aluminium as substantially pure hydroxide. The initial precipitation may be carried out by means of aluminium hydroxide as inoculant (the aluminium hydroxide being added or formed in situ with carbon dioxide) and inoculated mixture agitated or carbon dioxide added thereto, whereby 1-7 per cent of the alumina dissolved as aluminate may be precipitated. In the second stage, precipitation may be by inoculation and agitation or by the use of carbon dioxide. The impure aluminium hydroxide obtained in the first stage may be used as inoculant in the first stage of a further process. This procedure may be repeated until the efficiency decreases, and then the impure alumina is dissolved in sodium hydroxide and pure alumina recovered therefrom conventionally. An example is given in which the initial inoculant is equivalent to 20-25 per cent of the total precipitatable alumina.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB29746/55A GB799243A (en) | 1955-10-18 | 1955-10-18 | Process for the production of alumina of high purity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB29746/55A GB799243A (en) | 1955-10-18 | 1955-10-18 | Process for the production of alumina of high purity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB799243A true GB799243A (en) | 1958-08-06 |
Family
ID=10296500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29746/55A Expired GB799243A (en) | 1955-10-18 | 1955-10-18 | Process for the production of alumina of high purity |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB799243A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3607140A (en) * | 1968-11-19 | 1971-09-21 | Aluminum Co Of America | Preparation of alumina of improved purity by iron removal |
| US3832442A (en) * | 1970-10-20 | 1974-08-27 | Kaiser Aluminium Chem Corp | Method for producing alumina hydrates |
| FR2591581A1 (en) * | 1985-12-17 | 1987-06-19 | Pechiney Aluminium | PROCESS FOR THE PRODUCTION WITH HIGH PRODUCTIVITY OF ALUMINUM TRIHYDROXIDE, HIGH PURITY AND MEDIAN DIAMETER LESS THAN 4 MICROMETERS, RULES ON DEMAND |
-
1955
- 1955-10-18 GB GB29746/55A patent/GB799243A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3607140A (en) * | 1968-11-19 | 1971-09-21 | Aluminum Co Of America | Preparation of alumina of improved purity by iron removal |
| US3832442A (en) * | 1970-10-20 | 1974-08-27 | Kaiser Aluminium Chem Corp | Method for producing alumina hydrates |
| FR2591581A1 (en) * | 1985-12-17 | 1987-06-19 | Pechiney Aluminium | PROCESS FOR THE PRODUCTION WITH HIGH PRODUCTIVITY OF ALUMINUM TRIHYDROXIDE, HIGH PURITY AND MEDIAN DIAMETER LESS THAN 4 MICROMETERS, RULES ON DEMAND |
| EP0231715A1 (en) * | 1985-12-17 | 1987-08-12 | Aluminium Pechiney | High-output process, controlled as required, for the preparation of high purity aluminiumtrihydroxide having a mean diameter lower than 4 microns |
| US4732742A (en) * | 1985-12-17 | 1988-03-22 | Aluminum Pechiney | Process for the production at a high level of productivity of aluminum trihydroxide in a high state of purity and with a median diameter of less than 4 micrometers, which is regulated as required |
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