REMOVE OF COLOUR AND ORGANIC MATTERS IN INDUSTRIAL PHOSPHORIC ACID BY OZONE, EFFECT ON ACTIVATED CARBON TREATMENT

摘要

Industrial phosphoric acid at 42-45% P_2O_5 and containing organic matters (OM) in the range of 220 ppm to 300 ppm is treated by combined ozonation and activated carbon. Ozonation alone removes initial dark colour of acid and eliminates organic contents. Adsorption on activated carbon alone can reduce OM by 80% for more than 25 g/kg P_2O_5. We find that a previous ozonation enhance noticeably activated carbon efficiency and reduces its specific consumption. Isoconversion curves are plotted in specific ozone and activated carbon ratio space.