Method of purifying phosphoric acid

In the purification of wet process phosphoric acid by the solvent extraction of sulfuric acid acidulated phosphatic ores wherein there is formed an aqueous phase containing the major part of the impurities and a solvent phase containing purified phosphoric acid and separating both said phases, and recovering the phosphoric acid the improvement which comprises extracting the phosphoric acid with an organic, essentially water-insoluble liquid extractant consisting essentially of an organic phosphate selected from the group consisting of an alkyl phosphate, an aryl phosphate or an alkyl aryl phosphate diluted with an organic solvent selected from the class consisting of diisobutyl ketone, acetophenone, benzophenone, 3-octanone, 1-octanol and 1-decanol.