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AT9493B - Process for the production of alkali dichromate. - Google Patents

Process for the production of alkali dichromate.

Info

Publication number
AT9493B
AT9493B AT9493DA AT9493B AT 9493 B AT9493 B AT 9493B AT 9493D A AT9493D A AT 9493DA AT 9493 B AT9493 B AT 9493B
Authority
AT
Austria
Prior art keywords
sep
production
ammonia
alkali dichromate
treatment
Prior art date
Application number
Other languages
German (de)
Inventor
Francis Mudie Spence
David Dick Spence
Arthur Shearer
Thomas John Ireland Craig
Original Assignee
Francis Mudie Spence
David Dick Spence
Arthur Shearer
Thomas John Ireland Craig
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Francis Mudie Spence, David Dick Spence, Arthur Shearer, Thomas John Ireland Craig filed Critical Francis Mudie Spence
Application granted granted Critical
Publication of AT9493B publication Critical patent/AT9493B/en

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  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Description

  

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<tb> 
<tb> Natriumcarbonat <SEP> etwa <SEP> . <SEP> . <SEP> . <SEP> . <SEP> 32 <SEP> kg,
<tb> Ungelöschter <SEP> Kalk <SEP> etwa <SEP> . <SEP> . <SEP> . <SEP> . <SEP> 90 <SEP> kg,
<tb> Chromerz <SEP> etwa <SEP> . <SEP> . <SEP> . <SEP> . <SEP> 100 <SEP> kg.
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 Natrium- (oder Kalium-) Chromat und Ammoniumchromat enthält, wird wieder von dem niedergeschlagenen Calciumcarbonat getrennt. 



   Wenn wenig oder gar keine Magnesia in der Schmelze enthalten ist, so ist nur eine einmalige Behandlung mit Kohlensäure und Ammoniak nöthig. Diese Behandlung wird solange fortgesetzt, bis alle oder annähernd alle entziehbaro Chromsäure in Lösung übergegangen ist. Das in den Dämpfen, welche bei der Behandlung mit Kohlensäure und Ammoniak erzeugt werden, enthaltene Ammoniak kann durch allgemein bekannte Mittel wiedergewonnen worden, und es sind die üblichen   Vorsichtsmassregeln   zu beachten,   um   
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   Die klare Lösung, mag sie durch die einfache oder doppelte Behandlung erzielt worden sein, wird nun in einem geschlossenen Gefässe gekocht, um das Ammoniak auszutreiben, welches wiedergewonnen und nochmals benutzt wird. Ungelöste Substanzen, welche während dieser Verdampfung niedergeschlagen werden, werden abgesondert und können entweder mit anderen Materialien   zusammen   zur Herstellung der   Schmolzung   be- 
 EMI3.3 
 gemischt worden, zum Zwecke des   Niodorschlagcns   der Magnesia. 



   Wenn das   Ammoniak   aus der Lösung ausgetrieben ist, wird diese weiter der Verdämpfung und Concentration unterworfen, bis man das gewünschte Handelsproduct erhält. 



   Will man ein Product erhalten,   wctches, obwohl hauptsächlich Bichromat enthaltend,   
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 wendet man eine verhältnismässig geringe Menge Soda (oder Pottasche) an. 



   PATENT-ANSPRÜCHE : 
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 enthält, mit Kohlensäure und Ammoniak solange behandelt wird, bis alle durch den Process entziehbare Chromsäure in Lösung übergegangen und das Calcium als ('arhonat niedorgeschlagen ist, worauf die ungelösten und   niedergeschlagenen   Substanzen aus der Lösung 
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<tb> Sodium carbonate <SEP> about <SEP>. <SEP>. <SEP>. <SEP>. <SEP> 32 <SEP> kg,
<tb> Unquenched <SEP> lime <SEP> about <SEP>. <SEP>. <SEP>. <SEP>. <SEP> 90 <SEP> kg,
<tb> Chrome ore <SEP> about <SEP>. <SEP>. <SEP>. <SEP>. <SEP> 100 <SEP> kg.
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 Sodium (or potassium) chromate and ammonium chromate is separated again from the precipitated calcium carbonate.



   If there is little or no magnesia in the melt, only a single treatment with carbonic acid and ammonia is necessary. This treatment is continued until all or almost all of the removable chromic acid has passed into solution. The ammonia contained in the vapors produced by the carbonic acid and ammonia treatment can be recovered by well known means, and normal precautions should be observed in order to
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   The clear solution, whether it has been obtained by the single or double treatment, is now boiled in a closed vessel in order to drive off the ammonia which is recovered and used again. Undissolved substances, which are deposited during this evaporation, are separated and can either be mixed with other materials to produce the melt.
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 mixed, for the purpose of eliminating magnesia.



   Once the ammonia has been driven from the solution, it is further subjected to evaporation and concentration until the desired commercial product is obtained.



   If one wants to obtain a product, although it contains mainly bichromate,
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 if you use a relatively small amount of soda (or potash).



   PATENT CLAIMS:
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 contains, is treated with carbonic acid and ammonia until all the chromic acid which can be withdrawn by the process has passed into solution and the calcium has precipitated as a carbonate, whereupon the undissolved and precipitated substances are removed from the solution
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Claims (1)

von Magnesia in der Schmelze bedingt ist, dadurch gekennzeichnet, dass die Behandlung mit Kohlensäure und Ammoniak an dem Punkte eingestellt wird, wenn : Magnosia anfängt, in die Lösung überzugehen, worauf die nicht gelösten und niedergeschlagenen Substanzen EMI3.7 is caused by magnesia in the melt, characterized in that the treatment with carbonic acid and ammonia is stopped at the point when: Magnosia begins to dissolve, whereupon the undissolved and precipitated substances EMI3.7
AT9493D 1900-06-26 1900-06-26 Process for the production of alkali dichromate. AT9493B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT9493T 1900-06-26

Publications (1)

Publication Number Publication Date
AT9493B true AT9493B (en) 1902-10-25

Family

ID=3503532

Family Applications (1)

Application Number Title Priority Date Filing Date
AT9493D AT9493B (en) 1900-06-26 1900-06-26 Process for the production of alkali dichromate.

Country Status (1)

Country Link
AT (1) AT9493B (en)

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