NON-CONVENTIONAL APPROACH FOR IMPURITIES REDUCTION DURING AND AFTER MANUFACTURING OF PHOSPHORIC ACID

A non-conventional method to reduce the impurities in the wet process phosphoric acid (WPPA) was
applied which divided into two parts: The first part deals with a process which utilizes phosphate rock,
fluorosilicic acid, and sulfuric acid to produce phosphoric acid, calcium fluorosilicate, and calcium sulfate
slurry by wet method. The second part studied the influence of hydroxyl-apatite (HAP) added to the
produced acid for adsorption of uranium, fluorine, rare earth elements (ΣREE), organic matter, and other
undesirable components those affected the quality of phosphoric acid. The relevant conditions in the
production and absorption processes have been optimized. The results show that, the obtained acid contains
low values of suspended & organic matter (191.7 ppm), and fluorine (0.5%). The addition of HAP, in the
form of bone powder, produce phosphoric acid contains low concentration of uranium, fluorine, and rare
earth elements equals 85, 94.6 and 79% respectively.