AT233522B - Process for the production of permanently neutral chalk - Google Patents

Process for the production of permanently neutral chalk

Info

Publication number
AT233522B
AT233522B AT219662A AT219662A AT233522B AT 233522 B AT233522 B AT 233522B AT 219662 A AT219662 A AT 219662A AT 219662 A AT219662 A AT 219662A AT 233522 B AT233522 B AT 233522B
Authority
AT
Austria
Prior art keywords
chalk
neutral
permanently
production
suspension
Prior art date
Application number
AT219662A
Other languages
German (de)
Original Assignee
Leo Werke G M B H
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 Leo Werke G M B H filed Critical Leo Werke G M B H
Priority to AT219662A priority Critical patent/AT233522B/en
Application granted granted Critical
Publication of AT233522B publication Critical patent/AT233522B/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D13/00—Pencil-leads; Crayon compositions; Chalk compositions

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Herstellung von dauernd neutraler Kreide 
 EMI1.1 
 

 <Desc/Clms Page number 2> 

 
B.Kreide wieder alkalisch geworden, so dass 11   cms     n/10-Salzsäure   erforderlich sind, um die Kreide wieder auf den Neutralwert zu bringen. 



     Beispiel 2 : 100   Teile Kreide werden mit 1000 Teilen Wasser angeschlämmt. Unter gutem Rühren gibt man sodann 0, 1 Teil Dicalciumphosphat hinzu, wodurch die Neutralisierung schlagartig erfolgt, und trennt danach in bekannter Weise die Kreide ab. Technisch wird so verfahren, dass man das   Dicalcium-   phosphat gleich nach beendeter Fällung der Kreide zusetzt.



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  Process for the production of permanently neutral chalk
 EMI1.1
 

 <Desc / Clms Page number 2>

 
B. Chalk has become alkaline again, so that 11 cms of n / 10 hydrochloric acid are required to bring the chalk back to the neutral value.



     Example 2: 100 parts of chalk are slurried with 1000 parts of water. 0.1 part of dicalcium phosphate is then added with thorough stirring, as a result of which the neutralization takes place suddenly, and then the chalk is separated off in a known manner. Technically, the procedure is that the dicalcium phosphate is added to the chalk immediately after the precipitation has ended.

Claims (1)

PATENTANSPRUCH : Verfahren zur Herstellung von dauernd neutraler Kreide, dadurch gekennzeichnet, dass man feinverteilte Kreide in wässeriger Aufschlämmung mit 0, 03 - 0, 31ljo Dicalciumphosphat, berechnet auf das Gewicht der trockenen Kreide, vermischt und gegebenenfalls das Wasser in gewünschtem Ausmass aus der Aufschlämmung entfernt. PATENT CLAIM: Process for the production of permanently neutral chalk, characterized in that finely divided chalk in aqueous suspension is mixed with 0.33-0.31jo dicalcium phosphate, calculated on the weight of the dry chalk, and the water is optionally removed from the suspension to the desired extent.
AT219662A 1962-03-16 1962-03-16 Process for the production of permanently neutral chalk AT233522B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT219662A AT233522B (en) 1962-03-16 1962-03-16 Process for the production of permanently neutral chalk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT219662A AT233522B (en) 1962-03-16 1962-03-16 Process for the production of permanently neutral chalk

Publications (1)

Publication Number Publication Date
AT233522B true AT233522B (en) 1964-05-11

Family

ID=3529765

Family Applications (1)

Application Number Title Priority Date Filing Date
AT219662A AT233522B (en) 1962-03-16 1962-03-16 Process for the production of permanently neutral chalk

Country Status (1)

Country Link
AT (1) AT233522B (en)

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