CH202909A - 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
- CH202909A CH202909A CH202909DA CH202909A CH 202909 A CH202909 A CH 202909A CH 202909D A CH202909D A CH 202909DA CH 202909 A CH202909 A CH 202909A
- Authority
- CH
- Switzerland
- Prior art keywords
- sep
- barium
- production
- materials containing
- metallic
- 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)
- Manufacture And Refinement Of Metals (AREA)
Description
Verfahren zur Herstellung von metallischem Barium durch thermische Reduktion von bariumoxydhaltigen Ausgangsstoffen. Als Reduktionsmittel für die thermische Gewinnung von Barium im Laboratoriums massstab aus Bariumoxyd enthaltenden Roh stoffen sind vor allem Aluminium oder Sili zium in Vorschlag gebracht worden, während sich Kohle wegen der Reoxydationsgefahr des gebildeten Bariums durch .das entstandene Kohlenoxyd nicht bewährt hat.
Die Reduktion mit Aluminium verläuft nicht, wie zunächst vermutet werden könnte, gemäss der Gleichung 3Ba0 -I- 2 Al = A10, -f- 3Ba sondern geht, wie gefunden wurde, etwa nach folgender Gleichung vor sich:
4Ba0 + 2 Al = Ba0. A1203 -I- 3Ba. Aus diesem Grunde ist es für eine voll ständige Ausnutzung des Reduktionsmittels notwendig, das Bariumoxyd in einem Tlber- 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 ge wählt, dass bei Anwendung von Aluminium das Molverhältnis des Bariumoxydes zu letz terem etwa 4 : 2 beträgt.
Die Reaktionsgeschwindigkeit der Ge mische kann durch Zusatz von Alkali- oder Erdalkalifluoriden, insbesondere Barium- fluorid, in Mengen zwischen 0,5 und 5 Ge wichtsprozent, vorzugsweise 2 Gewichtspro zent, zum Reaktionsgemisch erheblich ge steigert werden.
<I>Beispiel:</I> Ein Gemisch von 640 Gewichtsteilen Ba riumoxyd .(96%ig) und 54 Gewichtsteilen Aluminiumgries wurde in einen Röhrenofen eingesetzt und im Vakuum bei<B>1300'</B> wäh rend zwei Stunden der Reaktion überlassen. Das flüssig kondensierte und ausserhalb der Ileizzone in einen nichtbeheizten Behälter ab gegossene Bariummetall wurde unter Luft zutritt aus dem Ofen entfernt.
Process for the production of metallic barium by thermal reduction of starting materials containing barium oxide. As a reducing agent for the thermal extraction of barium on a laboratory scale from raw materials containing barium oxide, aluminum or silicon in particular have been proposed, while coal has not proven itself due to the risk of reoxidation of the barium formed by the carbon oxide formed.
The reduction with aluminum does not proceed, as might initially be assumed, according to the equation 3Ba0 -I- 2 Al = A10, -f- 3Ba but, as was found, proceeds roughly according to the following equation:
4Ba0 + 2 Al = Ba0. A1203 -I- 3Ba. For this reason, in order to fully utilize the reducing agent, it is necessary to apply the barium oxide in excess of 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 aluminum is used, the molar ratio of the barium oxide to the latter is about 4: 2.
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.
<I> Example: </I> A mixture of 640 parts by weight of barium oxide (96%) and 54 parts by weight of aluminum grit was placed in a tube furnace and in a vacuum at <B> 1300 '</B> for two hours of the reaction left. The barium metal, which was condensed in liquid form and poured into a non-heated container outside the ileizzone, was removed from the furnace with access to air.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202909X | 1937-01-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH202909A true CH202909A (en) | 1939-02-15 |
Family
ID=5773811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH202909D CH202909A (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) | CH202909A (en) |
-
1937
- 1937-12-28 CH CH202909D patent/CH202909A/en unknown
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CH202909A (en) | Process for the production of metallic barium by thermal reduction of starting materials containing barium oxide. | |
DE1567447A1 (en) | Process for the production of pure, crystalline tetrametaphosphates of polyvalent cations | |
DE875512C (en) | Process for the cleavage of unsaturated ketones | |
DE714780C (en) | Process for extracting metallic barium by thermal reduction of starting materials containing barium oxide | |
US2413050A (en) | Alkyl silicon chlorides and their preparation | |
CH205831A (en) | Process for the production of metallic barium by thermal reduction of starting materials containing barium oxide. | |
DE523116C (en) | Process for the production of urea | |
AT156577B (en) | Process for the thermal extraction of the alkaline earth metals calcium, strontium and barium. | |
DE913769C (en) | Process for the production of orthosilicic acid esters | |
DE1188055B (en) | Process for the production of polyphosphates with a low bulk weight | |
DE881502C (en) | Process for the production of ª ‡, ª ‰ -Dichloropropionaldehyde or its homologues | |
DE584775C (en) | Process for the treatment of gas mixtures that are relatively poor in saturated hydrocarbons | |
SU518924A1 (en) | Method of producing aluminium fluoride | |
DE682559C (en) | Process for the thermal extraction of calcium, strontium and barium by reducing raw materials containing alkaline earth metal oxide with the aid of silicon and aluminum or both | |
AT224652B (en) | Process for the production of vinyl phosphonic acid | |
DE569918C (en) | Process for the production of lead dust | |
DE536360C (en) | Production of lining plates or stones from silicon alloy putty | |
DE766603C (en) | Process for the reduction of oxides of the alkaline earth metals | |
DE907886C (en) | Process for the production of a large, fissile synthetic mica, especially suitable for the production of inorganic insulating materials | |
DE860636C (en) | Process for the production of acrylic azide | |
DE714314C (en) | Process for the preparation of cyclohexenones | |
DE687968C (en) | Process for the production of sublimed aluminum chloride | |
DE611781C (en) | Process for the separation of carbonic acid from carbonic acid-containing gases | |
DE454646C (en) | Process for the production of chemically pure aluminum | |
Rosenblum | Communication to the Editor: The Formation of Benzene in the Radiochemical Polymerization of Acetylene |