GB996661A - Formation of alkali metal aluminates - Google Patents
Formation of alkali metal aluminatesInfo
- Publication number
- GB996661A GB996661A GB38668/63A GB3866863A GB996661A GB 996661 A GB996661 A GB 996661A GB 38668/63 A GB38668/63 A GB 38668/63A GB 3866863 A GB3866863 A GB 3866863A GB 996661 A GB996661 A GB 996661A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alkali metal
- alkaline earth
- earth metal
- fluoride
- mix
- 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
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
Alkali metal aluminate, together with hydrogen fluoride, is formed by heating a solid mixture which includes an alkaline earth metal fluoride, a source of an alkali metal monoxide and free and/or combined silica and alumina to a temperature of at least 1000 DEG C. in the presence of water vapour. The mix should contain sufficient alkaline earth metal fluoride to eliminate all silica as alkaline earth metal silicate. Preferably, the molar proportions of alkaline earth metal fluoride, alkali metal monoxide, silica and alumina are 2: 1: 1: 1, and the mix is heated to a temperature of from 1000 DEG C. to 1300 DEG C. for from 15 to 120 minutes. Highly siliceous materials containing alumina, for example bauxites, aluminous clays, kaolin and red mud waste from the Bayer process in bauxite reducing plants, and alkaline earth metal fluorides, for example fluorspars and by-product calcium fluoride from the defluorination of phosphate rock, may be used. To obtain the preferred molar proportions, siliceous material and a source of alkali metal monoxide, for example soda ash, may be added as required to the mix. From the resulting sinter, alkali metal aluminate may be leached out by known methods, and the aluminate solution may then react with the hydrogen fluoride, which may be recovered from the effluent combustion gases, to form cryolite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB38668/63A GB996661A (en) | 1963-10-01 | 1963-10-01 | Formation of alkali metal aluminates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB38668/63A GB996661A (en) | 1963-10-01 | 1963-10-01 | Formation of alkali metal aluminates |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB996661A true GB996661A (en) | 1965-06-30 |
Family
ID=10404929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB38668/63A Expired GB996661A (en) | 1963-10-01 | 1963-10-01 | Formation of alkali metal aluminates |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB996661A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020174372A1 (en) * | 2019-02-25 | 2020-09-03 | Rio Tinto Alcan International Ltd. | Use of calcium fluoride in the bayer process |
-
1963
- 1963-10-01 GB GB38668/63A patent/GB996661A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020174372A1 (en) * | 2019-02-25 | 2020-09-03 | Rio Tinto Alcan International Ltd. | Use of calcium fluoride in the bayer process |
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