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The Removal Of Fluorine From Wet Process Phosphoric Acid, Fathi Habashi
The Removal Of Fluorine From Wet Process Phosphoric Acid, Fathi Habashi
Fathi Habashi
Fluorine (and silicon) can be removed from technical phosphoric acid (30% P205) and recovered quantitatively as a by-product by adding a sodium or a potassium salt preferably the carbonate and boiling for a few minutes. The corresponding fluorosilicate precipitate, e.g. 2Na+ + SiF6- → Na2SiF6 can be separated by filtration. If this procedure is followed, no precipitation will take place in the evaporators during concentration of acid to 40% P2O5.