DE394199C - Process for the production of precipitated phosphate - Google Patents

Process for the production of precipitated phosphate

Info

Publication number
DE394199C
DE394199C DEB107863D DEB0107863D DE394199C DE 394199 C DE394199 C DE 394199C DE B107863 D DEB107863 D DE B107863D DE B0107863 D DEB0107863 D DE B0107863D DE 394199 C DE394199 C DE 394199C
Authority
DE
Germany
Prior art keywords
production
phosphate
precipitated
fluorine
precipitated phosphate
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
DEB107863D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Priority to DEB107863D priority Critical patent/DE394199C/en
Application granted granted Critical
Publication of DE394199C publication Critical patent/DE394199C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B11/00—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes
    • C05B11/04—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Fertilizers (AREA)

Description

Verfahren zur Herstellung von gefälltem Phosphat. Die Herstellung von Dikalziumphosphat geschieht gewöhnlich in der Weise, daß die Rohphosphate in einer Säure, z. B. Salzsäure, gelöst «-erden und die schwachsaure Monophosphatlösung mit Ätzkalk, Thomasmehl, Kalkstein, Soda oder anderen basischen Mitteln gefällt wird. Hierzu verwendet man meist fluorfreie Rohphosphate oder solche mit sehr geringem Fluorgehalt, wie Knochenasche, oder minderwertige, sehr kalkreiche Rohphosphate, wobei man ohne Schwierigkeiten ein gutes Düngemittel erhält.Process for the production of precipitated phosphate. The production of dicalcium phosphate is usually done in such a way that the rock phosphates in an acid, e.g. B. hydrochloric acid, dissolved «-erden and the weakly acidic monophosphate solution with quick lime, Thomas flour, limestone, soda or other alkaline agents will. For this purpose, fluorine-free rock phosphates or those with a very low level are usually used Fluorine content, such as bone ash, or inferior, very lime-rich rock phosphates, a good fertilizer can be obtained without difficulty.

Bei Verwendung von hochwertigen Rohphosphaten mit mehr oder weniger großem Fluorgebalt entsteht aber beim Vermischen der schwach salzsauren Monophosphatlösung mit basischen Mitteln eine Phosphatfällung, welche zum großen Teil zitrat- und zitronensäureunlöslich ist. Es hat sich nun gezeigt, daß diese Tatsache durch die mitgelösten Fluorverbindungen bedingt ist, und claß ein völlig zitrat-und zitronensäurelöslicher Niederschlag erhalten wird, wenn vor der Ausfällung des Kalziumphosphates die Fluorverbindungen entfernt werden. Zu diesem Zweck kann man beispielsweise die saure, Fluoride oder Fluorwasserstoffsäure enthaltende Monopfiosphatlösung zunächst mit wenig Ätzkalk, Kalziumkarbonat oder anderen basischen Mitteln, z.B. den Salzenstark elektropositiver Metalle, mit schwachen Säuren vermischen, wobei sich das in neutraler Lösung schwerlösliche Kalziumfluorid mit etwas Kalziumphosphat abscheidet. Die von dem Niederschlag getrennte Monophosphatlösung wird alsdann in üblicher Weise mit der zur Ausfällung der Hauptmenge der Phosphorsäure erforderlichen Menge Ätzkalk, Thomasmehl o. dgl. versetzt. Das ausgefällte, phosphathaltige Kalziumfluorid kann natürlich zur Verwertung des Phosphorsäuregehaltes, gegebenenfalls auch des Fluorgehaltes, in geeigneter Weise, z. B. mittels Schwefelsäure, aufgearbeitet werden.When using high quality rock phosphates with more or less However, a large amount of fluorine is formed when the weakly hydrochloric acid monophosphate solution is mixed Phosphate precipitation with alkaline agents, which is largely insoluble in citrate and citric acid is. It has now been shown that this fact through the co-dissolved fluorine compounds is conditional, and a precipitate which is completely soluble in citrate and citric acid is obtained if the fluorine compounds before the precipitation of the calcium phosphate removed. For this purpose, one can, for example, the acidic, fluoride or Hydrofluoric acid-containing monophosphate solution initially with a little quicklime, Calcium carbonate or other basic agents, e.g. the salts are strongly electropositive Metals, mix with weak acids, whereby the poorly soluble in neutral solution Calcium fluoride is deposited with a little calcium phosphate. The separated from the precipitate The monophosphate solution is then mixed in the usual way with that for the precipitation of the main amount the phosphoric acid required amount of quick lime, Thomas flour or the like. Added. That precipitated, phosphate-containing calcium fluoride can of course be used to utilize the phosphoric acid content, optionally also the fluorine content, in a suitable manner, for. B. by means of sulfuric acid, be worked up.

Claims (1)

PATrNT-AN SPRUCH: Verfahren zur Herstellung von gefälltem Phosphat aus Lösungen fluorhaltiger Rohphosphate, dadurch gekennzeichnet, daß vor der Ausfällung des Phosphats die Fluorverbindungen entfernt werden.PATRNT-AN SPRUCH: Process for the production of precipitated phosphate from solutions of fluorine-containing rock phosphates, characterized in that the fluorine compounds are removed before the phosphate is precipitated.
DEB107863D 1923-01-03 1923-01-03 Process for the production of precipitated phosphate Expired DE394199C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEB107863D DE394199C (en) 1923-01-03 1923-01-03 Process for the production of precipitated phosphate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB107863D DE394199C (en) 1923-01-03 1923-01-03 Process for the production of precipitated phosphate

Publications (1)

Publication Number Publication Date
DE394199C true DE394199C (en) 1924-04-15

Family

ID=6992027

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB107863D Expired DE394199C (en) 1923-01-03 1923-01-03 Process for the production of precipitated phosphate

Country Status (1)

Country Link
DE (1) DE394199C (en)

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