AT314474B - Process for the production of aluminum fluoride and cryolite - Google Patents
Process for the production of aluminum fluoride and cryoliteInfo
- Publication number
- AT314474B AT314474B AT810871A AT810871A AT314474B AT 314474 B AT314474 B AT 314474B AT 810871 A AT810871 A AT 810871A AT 810871 A AT810871 A AT 810871A AT 314474 B AT314474 B AT 314474B
- Authority
- AT
- Austria
- Prior art keywords
- cryolite
- aluminum
- aluminum fluoride
- production
- hydroxide
- Prior art date
Links
- 229910001610 cryolite Inorganic materials 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims description 7
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 title description 6
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 title description 6
- 238000004519 manufacturing process Methods 0.000 title description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims 1
- 239000011541 reaction mixture Substances 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 12
- 239000012452 mother liquor Substances 0.000 description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- -1 aluminum ammonium fluoride Chemical compound 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- TXBSWQWDLFJQMU-UHFFFAOYSA-N 4-(chloromethyl)-1,2-diethoxybenzene Chemical compound CCOC1=CC=C(CCl)C=C1OCC TXBSWQWDLFJQMU-UHFFFAOYSA-N 0.000 description 1
- VIFFFMXDCOQHKO-UHFFFAOYSA-N F.[AlH3] Chemical compound F.[AlH3] VIFFFMXDCOQHKO-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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
-
- 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
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
<Desc/Clms Page number 1>
EMI1.1
zurückgewonnenen Kieselfluorwasserstoffsäure.die entsprechend der folgenden Reaktion ablaufen :
EMI1.2
Zur Durchführung dieser Verfahren wird 8 bis 25% ige Kieselfluorwasserstoffsäure verwendet, wobei das Mengenverhältnis zwischen Kieselfluorwasserstoffsäure und Aluminiumhydroxyd das 0, 95-bis 1, 05fache des stöchiometrischen Verhältnisses betragen kann und die Temperaturen bei 60 bis über 1000C liegen. Unter die- sen Arbeitsbedingungen wird ein gut filtrierbares sis, erhalten, das Aluminiumhydroxyd gut ausgenutzt und eine hohe Kristallisationsgeschwindigkeit des Aluminiumfluorid-Trihydrats erzielt.
Um das Aluminiumfluorid-
EMI1.3
miniumfluorid enthält, kann entweder zum Absorbieren des Siliciumtetrafluorids oder zur Herstellung von Kryolith verwendet werden, wobei man zuerst schwerlösliches Aluminiumammoniumfluorid fällt, das nachher zum Aluminiumnatriumfluorid umgesetzt wird.
EMI1.4
<Desc/Clms Page number 2>
:stem oder gelöstem Natriumcarbonat oder Natriumhydroxyd bis zu einem pH-Wert von 3 bis 6, 5, Filtrieren und
Waschen zu einem Kryolith mit veränderlichem Kryolith-Modul verarbeitet, der vom Mengenverhältnis zwi- schen dem in der Mutterlauge vorhandenen Aluminiumfluorid und der in der Mutterlauge enthaltenen Alumi- niumfluorwasserstoffsäure abhängig ist.
Das erfindungsgemässe Verfahren weist folgende Vorteile auf : bessere Verwertung des Fluors und damit hö- here Ausbeuten an Aluminiumfluorid und Kryolith ; es kann Kieselfluorwasserstoffsäure niedrigerer Konzentra- tion verwendet werden, was sowohl die Güte der Endprodukte als auch die Absorptionsausbeute der in der Phos- phatdüngerindustrie anfallenden fluorhaltigen Gase gilnstigbeeinflusst ; es erlaubt im Vergleich zu den bekann- ten Verfahren eine wesentliche Vereinfachung der Erzeugungsanlagen für Kryolith und es beseitigt das Problem der Abwasserreinigung.
PATENTANSPRÜCHE :
1. Verfahren zur Herstellung von Aluminiumfluorid und von Kryolith durch Umsetzung von Kieselfluor- wasserstoffsäure mit Aluminiumoxyd bzw.-hydroxyd in Gegenwart eines Überschusses an Kieselfluorwasserstoffsäure und anschliessendes Ausfällen des Kryoliths aus der Mutterlauge, dadurch gekennzeichnet, dass zwecks Erzielung einer weitgehenden Verwertung der Kieselfluorwassertoffsäure und des Aluminiumoxyds bzw.
- hydroxyds, die Zugabe des Aluminiumoxyds bzw.-hydroxyds zur Kieselfluorwasserstoffsäure in zwei Stufen bei verschiedenen Temperaturen durchgeführt wird, wobei man in der ersten Stufe 1/3 der zur Reaktion benötigten Menge an Aluminiumoxyd bzw.-hydroxyd und in der zweiten Stufe die restlichen 2/3 des benötigten Aluminiumoxyds-bzw.-hydroxyds zugibt, dann aus dem erhaltenen, Aluminiumfluorwasserstoffsäure und Aluminiumfluorid enthaltenden Gemisch, das letztere durch Kristallisieren abtrennt, und die Aluminiumfluorwasserstoffsäure in der Mutterlauge mit Alkali bis auf einen pH-Wert von 3 bis 6, 5 neutralisiert, womit der Kryolith ausgefällt wird.
<Desc / Clms Page number 1>
EMI1.1
recovered hydrofluoric acid, which proceed according to the following reaction:
EMI1.2
To carry out this process, 8 to 25% strength hydrofluoric acid is used, the quantitative ratio between hydrofluoric acid and aluminum hydroxide being 0.95 to 1.05 times the stoichiometric ratio and the temperatures being 60 to over 1000C. Under these working conditions a readily filterable sis is obtained, the aluminum hydroxide is well utilized and a high rate of crystallization of the aluminum fluoride trihydrate is achieved.
To get the aluminum fluoride
EMI1.3
Contains miniumfluorid, can be used either to absorb the silicon tetrafluoride or to produce cryolite, first falling of sparingly soluble aluminum ammonium fluoride, which is then converted to aluminum sodium fluoride.
EMI1.4
<Desc / Clms Page number 2>
: stem or dissolved sodium carbonate or sodium hydroxide to a pH of 3 to 6, 5, filtering and
Washing processed into a cryolite with a variable cryolite module, which is dependent on the quantitative ratio between the aluminum fluoride present in the mother liquor and the aluminum hydrofluoric acid contained in the mother liquor.
The method according to the invention has the following advantages: better utilization of the fluorine and thus higher yields of aluminum fluoride and cryolite; hydrofluoric acid of lower concentration can be used, which has a favorable effect on both the quality of the end products and the absorption yield of the fluorine-containing gases produced in the phosphate fertilizer industry; Compared to the known methods, it allows a significant simplification of the generation plants for cryolite and it eliminates the problem of wastewater treatment.
PATENT CLAIMS:
1. A process for the production of aluminum fluoride and of cryolite by reacting silicofluoric acid with aluminum oxide or hydroxide in the presence of an excess of silicofluoric acid and subsequent precipitation of the cryolite from the mother liquor, characterized in that in order to achieve extensive utilization of the silicofluoric acid and the Aluminum oxide or
- hydroxyds, the addition of the aluminum oxide or hydroxide to the silicofluoric acid is carried out in two stages at different temperatures, in the first stage 1/3 of the amount of aluminum oxide or aluminum hydroxide required for the reaction and in the second stage the remaining 2 / 3 of the required aluminum oxide or hydroxide is added, then from the resulting mixture containing hydrofluoric acid and aluminum fluoride, the latter is separated off by crystallization, and the hydrofluoric acid in the mother liquor is neutralized with alkali to a pH of 3 to 6.5 with which the cryolite is precipitated.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT810871A AT314474B (en) | 1971-09-17 | 1971-09-17 | Process for the production of aluminum fluoride and cryolite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT810871A AT314474B (en) | 1971-09-17 | 1971-09-17 | Process for the production of aluminum fluoride and cryolite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AT314474B true AT314474B (en) | 1974-04-10 |
Family
ID=3602602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT810871A AT314474B (en) | 1971-09-17 | 1971-09-17 | Process for the production of aluminum fluoride and cryolite |
Country Status (1)
| Country | Link |
|---|---|
| AT (1) | AT314474B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1983002444A1 (en) * | 1982-01-07 | 1983-07-21 | Berglund, Hans, Arne, Lennart | A method for recovering useful products from waste products obtained when manufacturing aluminium fluoride |
| US4557918A (en) * | 1982-10-13 | 1985-12-10 | Boliden Aktiebolag | Method for producing silica |
-
1971
- 1971-09-17 AT AT810871A patent/AT314474B/en not_active IP Right Cessation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1983002444A1 (en) * | 1982-01-07 | 1983-07-21 | Berglund, Hans, Arne, Lennart | A method for recovering useful products from waste products obtained when manufacturing aluminium fluoride |
| EP0085287A1 (en) * | 1982-01-07 | 1983-08-10 | Boliden Aktiebolag | A method for recovering useful products from waste products obtained when manufacturing aluminium fluoride |
| US4557918A (en) * | 1982-10-13 | 1985-12-10 | Boliden Aktiebolag | Method for producing silica |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ELJ | Ceased due to non-payment of the annual fee |