抄録
The aim of this work is reducing the iron content in crude phosphoric acid produced from dissolution of Abu-Tartur phosphate in sulphuric acid to an acceptable limit without a large reduction of P2O5 percentage. Several methods were used to reduce the iron content, but this work was focused on the precipitation method because the technique of this method is more suitable for Abu-Tartur project. Na2CO3(NaCO2)2, NaOH, KOH and K4[Fe(CN)6].3H2O were used as a precipitating agent. The percentage of P2O5 and Fe in the filtrate were determined spectrophote-metrically and the precipitate was exposed to X-ray diffraction analysis. It is found that the most suitable materials are Na2CO3, NaOH and KOH, while sodium oxalate is a poor precipatating agent. Potassium ferrocyanide is a good one but it is not prefer because it is poisonous.
