DEV0006489MA - - Google Patents
Info
- Publication number
- DEV0006489MA DEV0006489MA DEV0006489MA DE V0006489M A DEV0006489M A DE V0006489MA DE V0006489M A DEV0006489M A DE V0006489MA
- Authority
- DE
- Germany
- Prior art keywords
- cryolite
- liquor
- fluorine
- added
- fluorine ions
- 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.)
- Active
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- REHXRBDMVPYGJX-UHFFFAOYSA-H Sodium hexafluoroaluminate Chemical compound [Na+].[Na+].[Na+].F[Al-3](F)(F)(F)(F)F REHXRBDMVPYGJX-UHFFFAOYSA-H 0.000 claims description 12
- 229910001610 cryolite Inorganic materials 0.000 claims description 12
- 229910052731 fluorine Inorganic materials 0.000 claims description 10
- 239000011737 fluorine Substances 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- -1 fluorine ions Chemical class 0.000 claims description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-N Carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- 238000005201 scrubbing Methods 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000005868 electrolysis reaction Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 230000036536 Cave Effects 0.000 claims 1
- 238000001914 filtration Methods 0.000 claims 1
- 230000001376 precipitating Effects 0.000 claims 1
- 238000011084 recovery Methods 0.000 claims 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- UIIMBOGNXHQVGW-UHFFFAOYSA-M NaHCO3 Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- PPQREHKVAOVYBT-UHFFFAOYSA-H dialuminum;tricarbonate Chemical class [Al+3].[Al+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O PPQREHKVAOVYBT-UHFFFAOYSA-H 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
BUNDESREPUBLIK DEUTSCHLANDFEDERAL REPUBLIC OF GERMANY
Tag der Anmeldung: 10. November 1953 Bekanntgemacht am 13. September 1956Registration date: November 10, 1953. Advertised on September 13, 1956
DEUTSCHES PATENTAMTGERMAN PATENT OFFICE
Es ist bekannt, das aus den Elektrolyseöfen, ausgiebrochene, kohlenstoff- und kryolithnaltige Wanneinfutter auf Kryolith dadurch aufzuarbeiten, daß das Kohiefutter in Gegenwart von Wasser fein vermählen, wird, worauf der nassen, Mischung ein ätzalkalischer Stoff zugegeben wird Diese Mischung wird auf ihren Siedepunkt, vorzugsweise auf ioo°, erhitzt und die bei dieser Behandlung anfallende Laugeflüssigkeit filtriert, wobei . die Kohle und andere unilösliche Bestandteile zurückbleiben. Der in Lösung gegangene Kryolith wird bei einer Temperatur von. 6o bis ioo° durch Einleiten von Kohlensäure odler mittels Alkailibicarbona,t gefällt.It is known that from the electrolytic furnaces, broken, carbon and cryolite Prepare tub feed on cryolite by fine-tuning the coal feed in the presence of water is ground, whereupon an alkaline substance is added to the wet mixture. This mixture is heated to its boiling point, preferably to 100 °, and that during this treatment accruing caustic liquid filtered, whereby. the carbon and other insoluble components remain. The dissolved cryolite is at a temperature of. 6o to 100 ° by introducing it of carbonic acid or by means of alkali bicarbonate, t like.
Bei Durchführung dieses Verfahrens hat sich aber gezeigt, daß die aus der Laugung dies KoMefutters der Elektrolyseöfen gewonnenen Laugen, mehr Aluminium enthalten, als das darin, vorhandene Fluor zur Kryolithbiikking erfordert. Werden nun derartige Laugen mit KohlensäureWhen this process was carried out, however, it has been shown that this KoMefutters from the leaching The lyes obtained in the electrolytic furnaces contain more aluminum than what is in them Requires fluorine for cryolite biikking. Are now such alkalis with carbonic acid
609 618/464609 618/464
V 6489 IVa/ 12ίV 6489 IVa / 12ί
oder Natriumb'icarboniait behandelt, so erhält man ein Produkt, das neben Kryolith noch basische Alumiiiiiumcarbonata enthält. Dieses Fällungsprodukt ist nun abier nach seiner Trocknung wegen seines hohen Hydratgehaltes für den direkten. Einsatz in diie Aluminiumelektrolyse nicht geeignet.or sodium bicarbonate treated, one obtains a product which, in addition to cryolite, also contains basic aluminum carbonates. This precipitation product is now abier after its drying because of its high hydrate content for the direct. mission not suitable for aluminum electrolysis.
Um daher das in den Laugen vorhandene Aluminium restlos als Kryolith auszufällen, ist es erforderlich,, der Lauge Fluorionen zuzusetzen:.In order to completely precipitate the aluminum present in the lyes as cryolite, it is necessary necessary to add fluorine ions to the lye :.
ίο Es hat sich nun als vorteilhaft erwiesen, diese Fluoirionen, in Form von bei der Reinigung des Ofenabgases anfallender Waschlauge zuzusetzen. Dabei hat sich herausgestellt, daß zum Ausfällen des Kryoliths mit einem hohen Anteil an, Fluor in der zur Fällung gelangenden. Lauge etwa 30 °/o mehr Fluor vorhanden sein muß, als dem stöchiometrischen Verhältnis Alumimium zu Fluor entspricht.ίο It has now been shown to be beneficial to this Fluorine ions, in the form of when cleaning the Add washing liquor produced by the furnace exhaust gas. It turned out that to failure of the cryolite with a high proportion of fluorine in the precipitate. Lye about 30% more fluorine must be present than corresponds to the stoichiometric ratio of aluminum to fluorine.
Während die nach dem Ausfällen, des Kryoliths,While the after precipitation, the cryolite,
erhaltene Endlauge wieder in dlie Gaswaschanlage zurückgeleitet und als Fluonionenträger neuerlich der durch die Laugung der Bodenkohle erhaltenen Lauge zugesetzt werden kann, wird die abfiltrieirte, gewaschene und getrockniete Bodemkohle zur Herstellung der Ofenböden verwendet. Sie wird, aber vorteilhaft auch als Brennstoff, und; zwar staubförmig oder brikettiert, verwendet. The final liquor obtained is fed back into the gas scrubbing system and again as a fluon ion carrier can be added to the lye obtained by leaching the ground coal, the filtered off, washed and dry-riveted coal for production the oven floors are used. It becomes, but beneficial also as fuel, and; used in powder form or in briquettes.
Trotz der Notwendigkeit, einen etwa 30°/oigen. Fluorüberschuß in der Restlauge aufrechtzuerhalten, tritt kein Verlust an Fluorionen ein, da diese;, wie oben dargelegt, neuerlich der Gaswaschanlage zugeführt werden.Despite the need to have an approximately 30%. To maintain excess fluorine in the residual liquor, there is no loss of fluorine ions, as these; as explained above, again in the gas scrubbing system are fed.
Claims (3)
Family
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