Leachability of Lanthanides from their Bearing Rocks at Abu FuradArea, Central Eastern Desert, Egypt
2017
Leachability of lanthanides from the radioactive pegmatite pockets
found in Gabal Abu Furad area, southwest Safaga city, limited by latitudes
26°37′ and 26°43′ and longitudes 33°36′ and 33°43′ E. Central
Eastern Desert, Egypt. It was investigated using different acids at different
concentrations, liquid-to-solid ratios, contact times and temperatures in
order to determine the optimum recovery conditions. The best leaching
efficiency was obtained with 40 g/l HCl solution, 8 hours contact time,
90°C temperature and 1:5 (g/ml) solid:liquid ratio. Afterwards, lanthanide
stock solutions were prepared by applying the optimum leaching
conditions. Lanthanides were then precipitated by either 10% oxalic acid
or 20% sodium hydroxide solutions. Electron scanning microscope (ESM)
analysis was utilized to determine the qualitative percentage of the existed
lanthanides. It was found that thorium percentage was around 10.05%.
High percentages of light lanthanides were detected, e.g., La (11.16%),
cerium (39.97%), Pr (6.21%), Nd (13.99%), Sm (2.00%), and Gd (1.06%).
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