A procedure for purifying phosphoric acid with respect to iron impurities. (Machine-translation by Google Translate, not legally binding)

摘要

A process for purifying phosphoric acid with respect to iron impurities comprising reducing trivalent iron impurities contained in said phosphoric acid to the divalent oxidation state and contacting said phosphoric acid containing said reduced iron impurities with a water-insoluble amine extractant in sufficient amounts to extract said phosphoric acid and form a water-insoluble extractant phase comprising said amine and said phosphoric acid. (Machine-translation by Google Translate, not legally binding)