Selective separation of uranium from xenotime-bearing ferruginous sandstone of Southwestern Sinai, by using carbonate leaching

摘要

Besides being a xenotime-bearing, the ferruginous sandstone of Southwestern Sinai and which belongs to the Adediya Formation of the Cambrian age has also been proven to be relatively uraniferous. A technological sample of this ore material has been collected from Wadi El Sahu area and was found to assay up to 15.43% RE2O3 and 0.071% U. The latter involves alkali agitation leaching of the ore material and where the studied optimum conditions includes 90 g/1 Na2CO3 concentration, 30 g/l NaHCO3 concentration at a S/L ratio of 1/2 for 4 hrs agitation time at room temperature and using an ore grain size ground to -200 mesh. Under these conditions, a uranium leaching efficiency of 97.2 % has been obtained. From the obtained leach liquor, U was separated through two techniques; namely direct precipitation and a prior application of anion exchange resin.