CH205831A - Process for the production of metallic barium by thermal reduction of starting materials containing barium oxide. - Google Patents
Process for the production of metallic barium by thermal reduction of starting materials containing barium oxide.Info
- Publication number
- CH205831A CH205831A CH205831DA CH205831A CH 205831 A CH205831 A CH 205831A CH 205831D A CH205831D A CH 205831DA CH 205831 A CH205831 A CH 205831A
- Authority
- CH
- Switzerland
- Prior art keywords
- barium
- starting materials
- production
- materials containing
- thermal reduction
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/20—Obtaining alkaline earth metals or magnesium
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Description
Verfahren zur Herstellung von metallischem Barium durch thermische ]Reduktion von bariumogydhaltigen Ausgangsstoffen. Als Reduktionsmittel für die thermische Gewinnung von Barium im Laboratoriums massstab aus Dariumoxyd enthaltenden Roh stoffen sind vor allem Aluminium oder Si lizium in Vorschlag gebracht worden, wäh rend sich Kohle wegen der Reoxydations- gefahr des gebildeten Bariums durch das ent standene Kohlenoxyd nicht bewährt hat.
Im Hauptpatent ist nun ein Verfahren beschrieben, nach welchem bei der ther mischen Reduktion von bariumoxydhaltigen Ausgangsstoffen mit Hilfe von Aluminium Ausgangsgemische verwendet werden, in denen das Molverhältnis Bariumoxyd: Alu minium etwa 4 : 2 beträgt.
Auch die Reduktion mit Silizium ver läuft nicht, wie zunächst vermutet werden könnte, gemäss der Gleichung 2]a0 -f- Si = @Si02 + 2Ba, sondern geht, wie gefunden wurde, etwa nach folgender Gleichung vor sich:
4]a0 + Si = 2]a0 . Si0z -I- 2Ba. Aus diesem Grunde ist es für eine voll ständige Ausnutzung des Reduktionsmittels notwendig, das Bariumoxyd in einem Über schuss über die dem Reduktionsmittel äqui valente und bisher als ausreichend angenom mene Menge anzuwenden. Es wird daher ge mäss der letztgenannten Gleichung die Zu sammensetzung der Reaktionsgemische so gewählt, dass bei Anwendung von Silizium das Molverhältnis des Bariumoxyds zum Si lizium etwa 4 : 1 beträgt.
Die Reaktionsgeschwindigkeit der Ge mische kann durch Zusatz von Alkali- oder Erdalkalifluoriden, insbesondere Barium- fluorid, in Mengen zwischen 0,5 und 5 Ge- wichts-Prozent vorzuLysweise 2 Gewichtspro- zerrt, zum Reaktionsgemisch erheblich gestei gert werden.
Beispiel: Ein gepresstes Gemisch von 640 Gewichts teilen Bariumoxyd (96%ig), 30 Gewichts teilen Ferrosilizium <B>(93%</B> Si enthaltend) und 10 Gewichtsteilen Bariumfluorid wurde in einen Röhrenofen eingesetzt und im Va kuum bei<B>1300'</B> während zwei Stunden der Reaktion überlassen. Das flüssig konden sierte Bariummetall wurde anschliessend un ter Überleiten eines Wasserstoffstromes aus dem Ofen entfernt.
Process for the production of metallic barium by thermal] reduction of starting materials containing barium oxide. As reducing agents for the thermal extraction of barium on a laboratory scale from raw materials containing darium oxide, aluminum or silicon in particular have been suggested, while coal has not proven itself due to the risk of reoxidation of the barium formed by the carbon oxide formed.
In the main patent, a method is now described, according to which in the thermal reduction of barium oxide-containing starting materials with the help of aluminum starting mixtures are used in which the molar ratio of barium oxide: aluminum is about 4: 2.
Even the reduction with silicon does not proceed, as might initially be assumed, according to equation 2] a0 -f- Si = @ Si02 + 2Ba, but, as was found, proceeds roughly according to the following equation:
4] a0 + Si = 2] a0. Si0z -I- 2Ba. For this reason, it is necessary for full utilization of the reducing agent to apply the barium oxide in an excess over the amount equivalent to the reducing agent and previously assumed to be sufficient. According to the last-mentioned equation, the composition of the reaction mixtures is therefore chosen so that when silicon is used, the molar ratio of barium oxide to silicon is about 4: 1.
The reaction rate of the mixtures can be increased considerably by adding alkali or alkaline earth fluorides, in particular barium fluoride, in amounts between 0.5 and 5 percent by weight, preferably 2 percent by weight, to the reaction mixture.
Example: A pressed mixture of 640 parts by weight of barium oxide (96%), 30 parts by weight of ferrosilicon (containing 93% Si) and 10 parts by weight of barium fluoride was placed in a tube furnace and in a vacuum at <B> 1300 'left to react for two hours. The liquid-condensed barium metal was then removed from the furnace by passing a stream of hydrogen over it.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE205831X | 1937-01-09 | ||
CH202909T | 1937-12-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH205831A true CH205831A (en) | 1939-06-30 |
Family
ID=25723872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH205831D CH205831A (en) | 1937-01-09 | 1937-12-28 | Process for the production of metallic barium by thermal reduction of starting materials containing barium oxide. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH205831A (en) |
-
1937
- 1937-12-28 CH CH205831D patent/CH205831A/en unknown
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