Document Type

Original Article

Subject Areas



Phosphoric acid; Glauconite; Acid-activated bentonite; Sodium montmorillonite; Organic matter removal


Wet-process phosphoric acid (WPPA) is considered the main source for the production of phosphate fertilizer around the world, it is produced by the reaction between sulfuric acid as a leaching agent and phosphate ore rocks. The produced acid contains various contaminants such as iron, magnesium, aluminum, cadmium, and organic matter. So the elimination of the organic matter very an essential stage for the production of purified phosphoric acid. Glauconite ore is present in the Abu-Tarture region nearly to the production site of phosphoric acid. For that no cost for the purification of the produced phosphoric acid and for the first time, glauconite is used in the purification of phosphoric acid. Treatment of phosphoric acid was studied at various parameters such as adsorbent type, adsorbent dose, temperature, and phosphoric acid concentration. The phosphoric acid can be measured before and after treatment by Spectrophotometer, volumetric titration methods, and atomic absorption Spectroscopy. The used glauconite is characterized by X-ray diffraction (XRD), elemental analysis by atomic absorption spectroscopy, and particle size analysis. The obtained results for organic carbon removal efficiency in the case of glauconite as adsorbent was 63.36% which may be an excellent adsorbent compared with acid-activated bentonite and sodium montmorillonite. This work aims to study the organic matter removal by glauconite as a novel adsorbent material in phosphoric acid purification and compare its results experimentally with the most industrial adsorbent materials such as acid-activated bentonite and sodium montmorillonite. The experimental data exhibited that glauconite promising for this purpose because it is a natural material and a reduction in expensive methods for the elimination of organic matter from phosphoric acid.