An Integrated Process for the Removal of Cd and U from Wet Phosphoric Acid
Articles > Article ยท 1999
Authors: Inmaculada Ortiz, Ana I. Alonso, Ana M. Urtiaga, Mustafa Demircioglu, Nilay Kocacik, Nalan Kabay
Industrial & Engineering Chemistry Research, International, WoS, 1999, vol 38, pp 2450-2459
DOI: 10.1021/ie980686s
Summary
In this work, an integrated process based on the application of two membrane technologies for the selective recovery of the U and the Cd contained in wet phosphoric acid is presented. The process is based on the removal of U by ion exchange using the Purolite S940 resin as ion-exchange resin followed by the selective removal of Cd by means of membrane-assisted solvent extraction with Aliquat 336 as the selective extractant. After sorption of U, the elution step was carried out with a 1 M solution of Na 2 CO 3 whereas the back extraction of Cd was efficiently achieved by simply using water in the back-extraction phase. Because of working with acidic solutions containing initially 200 mg/L of U and 50 mg/L of Cd, the viability of the process for reduction of the U and Cd concentration below 2 mg/L has been checked, obtaining the kinetic models and parameters of the removal steps, thus, establishing the basis for the process design and optimization.