GB732746A - Process for recovering cryolite from aluminium furnace waste and the like - Google Patents
Process for recovering cryolite from aluminium furnace waste and the likeInfo
- Publication number
- GB732746A GB732746A GB29566/53A GB2956653A GB732746A GB 732746 A GB732746 A GB 732746A GB 29566/53 A GB29566/53 A GB 29566/53A GB 2956653 A GB2956653 A GB 2956653A GB 732746 A GB732746 A GB 732746A
- Authority
- GB
- United Kingdom
- Prior art keywords
- aluminium
- cryolite
- fluorine
- soda lye
- hydrofluoric acid
- 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
- C01F7/48—Halides, with or without other cations besides aluminium
- C01F7/50—Fluorides
- C01F7/54—Double compounds containing both aluminium and alkali metals or alkaline-earth metals
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
In a process for recovering cryolite from materials containing aluminium and fluorine compounds, e.g. from waste material in electrolytic furnaces, the material is lixiviated with soda lye and the dissolved compounds containing fluorine and aluminium are precipitated with hydrofluoric acid. The material, which has been previously stored in a damp atmosphere to hydrate the alumina it contains is warmed with soda lye and most of the aluminium and fluorine removed. The remaining material can be treated with hydrofluoric acid, which is then added to the soda lye to produce cryolite. Proportions of sodium and total fluorine contents are adjusted as necessary for cryolite formation. If the original materials are poor in aluminium this is increased by adding alumina or aluminium fluoride.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE732746X | 1952-10-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB732746A true GB732746A (en) | 1955-06-29 |
Family
ID=6639818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29566/53A Expired GB732746A (en) | 1952-10-25 | 1953-10-26 | Process for recovering cryolite from aluminium furnace waste and the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB732746A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2943914A (en) * | 1957-04-01 | 1960-07-05 | Aluminium Ind Ag | Method of recovering fluorine from waste gases |
-
1953
- 1953-10-26 GB GB29566/53A patent/GB732746A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2943914A (en) * | 1957-04-01 | 1960-07-05 | Aluminium Ind Ag | Method of recovering fluorine from waste gases |
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