AT89946B - Process for digesting mineral phosphates. - Google Patents

Process for digesting mineral phosphates.

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Publication number
AT89946B
AT89946B AT89946DA AT89946B AT 89946 B AT89946 B AT 89946B AT 89946D A AT89946D A AT 89946DA AT 89946 B AT89946 B AT 89946B
Authority
AT
Austria
Prior art keywords
lime
carbonate
digesting
mineral phosphates
phosphates
Prior art date
Application number
Other languages
German (de)
Inventor
Ermenegilde Dr Stoppani
Vittorio Volpato
Original Assignee
Ermenegilde Dr Stoppani
Vittorio Volpato
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 Ermenegilde Dr Stoppani, Vittorio Volpato filed Critical Ermenegilde Dr Stoppani
Application granted granted Critical
Publication of AT89946B publication Critical patent/AT89946B/en

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Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zum   Aufschliessen   von mineralischen Phosphaten. 



   Vorliegende Erfindung betrifft die Herstellung eines assimilierbaren Phosphatdiingers durch   Aufschliessen   von mineralischen Phosphaten ohne Anwendung von Schwefelsäure. 



   Man hat schon vorgeschlagen, Gemische von mineralischen Phosphaten, insonderheit geringwertigen Sorten mit kohlensaurem Kalk, dessen Menge so bemessen wird, dass auf ein Molekel Phosphorsäure (P2O5) mindestens vier Molekeln Kalkkommen, bis zum Sintern zuglühen und dann gegebenen- 
 EMI1.1 
 flüssige Gemisch gegebenenfalls durch Berührung mit kaltem Wasser abschreckt. 



   Bei diesem Verfahren ist die Anwendung hoher Temperaturen (Sinter- und Schmelztemperaturen) vorgesehen, und findet auch die Anwendung verhältnismässig grosser Mengen von Zusatzstoffen statt, wodurch notwendigerweise der   Phosphorsäuregehalt des Produktes nieht'unerheblich herabgedrückt   wird. 



   Versuche, welche zu vorliegender Erfindung führten, haben gezeigt, dass es möglich ist, brauchbare Phosphorsäuredüngemittel in einfacher Weise darzustellen, wenn man mineralische Phosphate (bevorzugt sind hochwertige Phosphate) mit verhältnismässig geringen Mengen von kohlensaurem Kalk bei höchstens   600      C   glüht und die Masse mit Wasser zwecks Hydratisierung behandelt. Man erzielt hiedurch ohne Anwendung hoher zum Schmelzen des Guts erforderlicher Temperaturen und 
 EMI1.2 
 



   Die vorliegende Erfindung ist für Phosphate von einem weniger als 18% betragenden Kalkgehalt bestimmt ; u. zw. wird dem Phosphat soviel kohlensaurer Kalk zugesetzt, dass der Gesamtkalkgehalt des Gemenges   18  o beträgt,   es werden also bei einem   120   Ca   CO.,   enthaltenden Rohphosphat 6%   Ca. CO., zugesetzt.   

**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.



   <Desc / Clms Page number 1>
 



  Process for the digestion of mineral phosphates.



   The present invention relates to the production of an assimilable phosphate additive by digesting mineral phosphates without the use of sulfuric acid.



   It has already been proposed that mixtures of mineral phosphates, especially low-value types, with carbonate of lime, the amount of which is measured so that at least four molecules of lime per molecule of phosphoric acid (P2O5) are added, to sintering and then given-
 EMI1.1
 If necessary, quench the liquid mixture by contacting it with cold water.



   In this process, the use of high temperatures (sintering and melting temperatures) is provided, and the use of relatively large amounts of additives also takes place, which inevitably means that the phosphoric acid content of the product is not reduced significantly.



   Experiments that led to the present invention have shown that it is possible to produce useful phosphoric acid fertilizers in a simple manner if mineral phosphates (high-quality phosphates are preferred) with relatively small amounts of carbonate of lime at a maximum of 600 C and the mass with water treated for hydration. This is achieved without the use of high temperatures and temperatures required for melting the material
 EMI1.2
 



   The present invention is intended for phosphates of less than 18% lime content; u. between so much carbonate of lime is added to the phosphate that the total lime content of the mixture is 18 o, so for a rock phosphate containing 120 Ca CO., 6% Ca. CO., Added.

** WARNING ** End of DESC field may overlap beginning of CLMS **.

Claims (1)

PATENT-ANSPRUCH : Verfahren zum Aufschliessen von mineralischen Phosphaten deren (jenalt an kohlensauren Kalk weniger als zu beträgt, durch Glühen mit kohlensaurem Kalk, dadurch gekennzeichnet, dass man dem Phosphat soviel kohlensauren Kalk zumis-lit, dass der Gesamtkalkgehalt des Gemisches 18% beträgt und das Glühen hei höchstem etwa 600 C durchführt und die Masse nach dem Glühen mit Wasser behandelt. **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: Process for the digestion of mineral phosphates whose (the age of carbonate of lime is less than too) by calcining with carbonate of lime, characterized in that the phosphate is added so much carbonate of lime that the total lime content of the mixture is 18% and the annealing is at the highest about 600 C and the mass is treated with water after annealing. ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT89946D 1915-01-26 1920-07-13 Process for digesting mineral phosphates. AT89946B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT89946X 1915-01-26

Publications (1)

Publication Number Publication Date
AT89946B true AT89946B (en) 1922-11-10

Family

ID=11127630

Family Applications (1)

Application Number Title Priority Date Filing Date
AT89946D AT89946B (en) 1915-01-26 1920-07-13 Process for digesting mineral phosphates.

Country Status (1)

Country Link
AT (1) AT89946B (en)

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