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In the present study, adsorption of uranium from sulphate solutions was performed using Duolite ES-467 aminophosphonic acid chelating resin. Batch adsorption experiments were applied to assess the optimum parameters at pH3, 0.1 g resin dose, and 200 mg/L initial U(VI) concentration, for 90 min contact time at room temperature. The maximum sorption capacity was 75 mg/g at 25°C.From kinetic parameters, it was found that U(VI) adsorption followed pseudo-first-order kinetics. Besides, the equilibrium data fitted well with the Langmuir isotherm model. The values of thermodynamic parameters ( ΔH, ΔS , and  ΔG ) indicated that the uranium adsorption processes could be considered endothermic, randomness, and spontaneous using Duolite ES-467 resin. U(VI) waswholly eluted from the loaded Duolite ES-467 resin using 0.5 M HNO 3 . Finally, the optimised factors were applied for U(VI) recovery from G. Gattar for leach liquor to produce a uranium concentrate (Na 2 U 2 O 7 ) with 70.45% U(VI) content.

Potentiality of uranium recovery from G.Gattar leach liquor using Duolite ES-467 chelating resin: Kinetic, thermodynamic and isotherm features