In the present study, nano-calcium carbonate (NCC) was prepared from phosphogypsum (PG) as waste material from phosphate industry using Na2CO3 and Al(HCO3)3 as carbonates precursors. The physicochemical characteristics of the prepared nano-calcite CaCO3 were studied using various methods, including X-ray diffraction (XRD), scanning electron microscope (SEM), chemical analysis, plasma spectrometry with inductive coupling (ICP), as well as the Bernard calcimeter. The size of the pure nanocalcite particles produced differs according to the nature of the carbonate precursor; they are 51 nm and 68 with the use of sodium carbonate and aluminum hydrogen carbonate, respectively.

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Pyrrhotite ash is a solid waste widely generated from phosphate industry has been used in the present research as a based material for α-Fe2O3 nanoparticles synthesis. The iron extraction conditions from Pyrrhotite ash using hydrochloric acid were carried out under the optimized conditions. The obtained FeCl3 was deployed in the elaboration of hematite (α-Fe2O3) nanoparticles using co-precitation method where green tea extract was deployed as a reducing and capping agent. The prepared α-Fe2O3 nanoparticles were characterized by XRD, SEM, FTIR and BET technics. The prepared sample consists of cubical or spherical microporous nanoparticles with size ranging 56 to 116 nm and an average pore size of 0.78 nm. The elaborated nanoparticles are of high purity having a crystalline size at rage of 18.33-24.55 nm. The optical properties were investigated using UV–visible spectroscopy, the maximum visible light absorbance was observed at 350 nm while the corresponding gap band was determined as 2.11 eV. Furthermore, the Vibrating-sample magnetometer was used in order to examine the magnetic properties of the nanoparticles that appropriate a ferromagnetic behavior with high Ms, Mr, and Hc values of 14.59 emu/g and 4.72 emu/g -769.35 Oe.

In the present study, phosphogypsum waste (PG) was utilized to synthesize fluorapatite (FAP) via a simple precipitation method. The FAP was prepared using a novel mixing technique with anhydrite obtained from PG and phosphoric acid solution in the presence of pure fluoride ammonium in a Teflon reactor. The characteristics of the prepared FAP were investigated with various methods including Scanning Electron Microscopy (SEM) coupled with Energy-Dispersive Spectroscopy (EDS), X-Ray Diffraction (XRD), and Fourier Transform Infrared Spectroscopy (FTIR). The FAP derived from PG exhibited a hexagonal structure with a particle size ranging from 1.5 to 9 μm along with a high purity. FAP also showed an excellent Ca/P ratio equals to 1.67. These results proved that the FAP was successfully synthesized from phosphogypsum waste.