Back to results
US 4,053,561 AGranted
Removal of fluorine from phosphatic solutions
AssigneeStauffer Chemical Company
InventorMazin R. Irani
Life of this patent
Estimating the term…
Abstract
A method for removing fluoride ions from phosphoric acid by neutralizing said acid to a pH between about 5 and about 9, contacting the neutral salt solution thereby formed with an insoluble alkaline earth metal phosphate salt, and lowering the pH to convert the solution back to a purified acid.
Claims16
A method for removing fluoride ions from phosphoric acid comprising the steps of neutralizing said acid to a pH between about 5 and about 9, separating precipitated impurities, contacting the neutral salt solution thereby formed with an insoluble alkaline earth metal phosphate salt, and separating the neutral salt solution.
Dependencies are inferred from the claim text.