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An experimental study on the separation of lanthanides from phosphate ore by organic and inorganic acids

Citation

Nayl, A.; Abd-Elhamid, Ahmed; Arafa, Wael; Elkhashab, Reda (2021), An experimental study on the separation of lanthanides from phosphate ore by organic and inorganic acids, Dryad, Dataset, https://doi.org/10.5061/dryad.zkh18936p

Abstract

In this study, the separation of Lanthanides from phosphate ore using C2H2O4, C4H6O6, C3H6O3, H2SO4, and HCl was investigated. The ore was characterized before and after leaching processes by XRF, SEM, XRD, and IR. The different parameters affect the leaching rate such as leaching time, acid concentration, liquid/solid ratios, temperature, and leaching kinetics were studied. The optimal leaching conditions were determined as 0.4M H2C2O4, 2.5M C4H6O6, 1.8M C3H6O3, 2.0M H2SO4, and 3.0M HCl,  with a L/S ratio of 6/1 H2C2O4, 8/1 for both C4H6O6 and C3H6O3, 5/1 for both H2SO4 and HCl at 30 °C, agitation rate ≈ 350 rpm and particle size ≈ 144.8 μm. Under these optimum conditions, (%R) were 42.8% (for C2H2O4), 93.2% (for C4H6O6), 89.1% (for C3H6O3), 89.3% (for H2SO4), and 94.6% (for HCl). SEM and FTIR characterization for the residue was investigated. Experimental data reveals that, the leaching processes are fitted by chemical reaction models for C2H2O4 and C3H6O3, and by diffusion-reaction model for C4H6O6, H2SO4, and HCl. The activation energies for these models were estimated to be 43.3, 30.33, 45.8, 31.3, and 38.6 kJ/mol for C2H2O4, C4H6O6, C3H6O3, H2SO4 and HCl, respectively. All data were confirmed and explained by XRD, FTIR and SEM studies.

Methods

The mineralogical analysis of the phosphate sample and the residues was carried out by XRD-7000S High Resolution X-Ray Diffractometer Instrument.

Fourier transform infrared (FTIR) spectroscopy was performed Shimadzu IR Tracer and the scan was performed from 400 to 4000 cm-1.

Funding

Al Jouf University, Award: (623/39)