Comprehensive geochemical analysis of phosphate rocks in Abu Tarture Plateau: implications for fertilizer potential and agricultural applications

Abstract

The present study mainly focuses on the geochemical analysis techniques of high (HPR), medium (MPR), and low (LPR) oxidized phosphate rocks, employing various techniques to uncover significant alterations in their chemical composition and mineralogical, morphological, and geometrical properties. The comprehensive analysis involves the measurement of major oxides and mineral phases using complete and XRD analyses, while optical microscopy is utilized to verify the minerals present. Additionally, the zeta sizer technique is employed to ascertain the size of representative samples. Within the Duwi Formation, it could be subdivided vertically into three remarkable informal lithostratigraphic units. Notably, HPR and MPR exhibit elevated P₂O₅ content (30.20 wt.% and 24.80 wt.%, respectively), contrasting with the decreased content in LPR (6.5 wt.%). These findings position HPR and MPR as promising high-reactive P fertilizers suitable for direct agricultural application and as valuable P fertilizer sources following nutrient balancing.