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Phosphate Industry And The Radon Problem, Fathi Habashi
Phosphate Industry And The Radon Problem, Fathi Habashi
Fathi Habashi
The problem of radon generated during the treatment of phosphate rock by sulfuric acid to produce fertilizers can be solved by using nitric acid. In this case radium, which is the source of radon, goes into solution and can be precipitated by a controlled method and safely disposed of. A variety of options are discussed. Text in Farsi with English translation.
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.