An integrated process for the removal of Cd and U from wet phosphoric acid


ORTİZ I., ALONSO A., URTİAGA A., Demircioglu M. , Kocacik N. , Kabay N.

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, cilt.38, ss.2450-2459, 1999 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 38 Konu: 6
  • Basım Tarihi: 1999
  • Doi Numarası: 10.1021/ie980686s
  • Dergi Adı: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
  • Sayfa Sayıları: ss.2450-2459

Özet

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 df membrane-assisted solvent extraction with Aliquat 336 as the selective extractant. After sorption of U, the elution step was carried out with al M solution of Na2CO3 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.