Phosphoric Acid → Dicalcium phosphate-dihydrate

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Reaction Steps

A process for producing crystalline platelets of anhydrous dicalcium phosphate which comprises adding an aqueous solution of phosphoric acid to an aqueous slurry of lime particles in proportions to provide a final pH below 5 and a calcium to PO4 ratio of about 1:1 and at a rate sufficient to enable a substantially complete reaction of said acid and lime particles while maintaining the temperature sufficiently low to form a slurry of dicalcium phosphate dihydrate particles and then heating said latter slurry at a temperature and for a period of time sufficient to convert said dihydrate particles to crystalline platelets of anhydrous dicalcium phosphate having a mass medium diameter of about 12 to 18 microns.

Provenance & Evidence