Extraction of Yttrium from Ferruginous Sandstone, Southwestern Sinai, Egypt
Abstract
The Ferruginous sandstone ore was obtained from Ramlet Hemeyir area, Southwestern Sinai, Egypt, which contains 10 % (REE) rare earth elements. A representative sample has been subjected to acid agitation leaching using H2SO4 where 93% of the REE content was released by mixing the ground sample to (-100 mesh) with concentrated H2SO4 at solid/liquid (S/L) ratio of 1/2 for 5h at a temperature ranged from (250 - 300oC). The REE was precipitated in the oxalate form from the prepared sulfate leach liquor. Next selective extraction of 98% Y was achieved by contacting Y was extracted by di-(2-ethylhexyl) phosphoric acid (D2EHPA) with the aqueous solution of nitric acid leaching of the REE cake. Stripping was done by hot H2O (80 oC). Finally, a precipitation with oxalic acid was done followed by ignition at 950 oC. A yield of 95% Y oxide was produced.
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