DE923366C - Process for the production of cryolite from sodium fluoride and aluminum fluoride - Google Patents
Process for the production of cryolite from sodium fluoride and aluminum fluorideInfo
- Publication number
- DE923366C DE923366C DEV5842A DEV0005842A DE923366C DE 923366 C DE923366 C DE 923366C DE V5842 A DEV5842 A DE V5842A DE V0005842 A DEV0005842 A DE V0005842A DE 923366 C DE923366 C DE 923366C
- Authority
- DE
- Germany
- Prior art keywords
- fluoride
- cryolite
- production
- aluminum fluoride
- aluminum
- 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)
Description
Verfahren zur Herstellung von Kryolith aus Natriumfluorid und Aluminiumfluorid Es ist bekannt, wäßrige Lösungen von Natriumfluorid mit Aluminiumfluoridhydrat zu Natriumalumin:iumfluorid (Kryolith) umzusetzen. Dabei wurde bisher ein Aluminiumfluoridhydrat mit etwa 32 bis 331/o H20 verwendet. Die Aktivität dieses Fluorids war sehr unterschiedlich und ließ beim längeren Lagern stark nach. Im günstigsten Falle wurde das Natriumfluorid bei 9o bis ioo° zu 8o bis 85% umgesetzt, bei längerem Lagern des Aluminiumfluorids ging diese Umsetzung auf 50°/o und weniger zurück und konnte auch durch Arbeiten bei höheren Temperaturen unter Druck nicht wesentlich gesteigert werden. Durch diese geringen Ausbeuten wurde die Herstellung sehr verteuert, außerdem wurde infolge der schlecht vorher bestimmbaren Umsetzung ein Kryolith erhalten, der wechselnde Mengen von nicht umgesetztem Aluminiumfluorid enthielt.Process for the production of cryolite from sodium fluoride and aluminum fluoride It is known to add aqueous solutions of sodium fluoride with aluminum fluoride hydrate Sodium aluminum: iumfluorid (cryolite) to implement. So far, an aluminum fluoride hydrate has been used used with about 32 to 331 / o H20. The activity of this fluoride varied widely and slacked off considerably during longer periods of storage. In the most favorable case, this would be sodium fluoride at 9o to 100 ° converted to 8o to 85%, with longer storage of the aluminum fluoride this conversion went back to 50 ° / o and less and could also work cannot be increased significantly at higher temperatures under pressure. Through this low yields, the production was very expensive, moreover, as a result the poorly pre-determinable implementation of a cryolite received, the changing Contained amounts of unreacted aluminum fluoride.
überraschenderweise wurde nun gefunden, daß wasserfreies Aluminiumfluorid, das sich bei Temperaturen bis ioo° ebenfalls sehr schlecht umsetzt, bei Temperaturen über ioo°, z. B. 17o°, und Drücken oberhalb des normalen, z. B. etwa 8 atü und darüber, Umsetzungen ergibt, die regelmäßig bei etwa 95 % oder mehr liegen.Surprisingly, it has now been found that anhydrous aluminum fluoride, which also reacts very poorly at temperatures up to 100 °, at temperatures above 100 °, e.g. B. 17o °, and pressures above normal, z. B. about 8 atm and above, results in conversions that are regularly about 95 % or more.
Infolge der Verwendung von wasserfreiem Aluminiumfluorid bei höheren Temperaturen kann durch die höhere Ausbeute trotz des etwas höheren Dampfverbrauchs eine Verbilligung des Herstellungsverfahrens und durch die sichere Ausbeute ein viel gleichmäßigeres Produkt erzielt werden. Außerdem wird ein Teil der Frachtkosten heim Bezuge des wasserfreien Aluminiumfluorids gegenüber dem Hydrat eingespart.As a result of the use of anhydrous aluminum fluoride at higher Temperatures can be reduced due to the higher yield despite the somewhat higher steam consumption a cheaper production process and a safe yield much more uniform product can be achieved. It also becomes part of the freight cost Heim references of the anhydrous Aluminum fluoride versus hydrate saved.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEV5842A DE923366C (en) | 1953-05-29 | 1953-05-29 | Process for the production of cryolite from sodium fluoride and aluminum fluoride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEV5842A DE923366C (en) | 1953-05-29 | 1953-05-29 | Process for the production of cryolite from sodium fluoride and aluminum fluoride |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE923366C true DE923366C (en) | 1955-02-10 |
Family
ID=7571377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEV5842A Expired DE923366C (en) | 1953-05-29 | 1953-05-29 | Process for the production of cryolite from sodium fluoride and aluminum fluoride |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE923366C (en) |
-
1953
- 1953-05-29 DE DEV5842A patent/DE923366C/en not_active Expired
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