Solvent extraction kinetics of rare earth elements

Jinzhang Gao, Bo Peng, Haiyan Fan, Jingwan Kang

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The kinetics of solid liquid extraction of rare earth elements (RE) (La, Ce, Sm, Dy and Yb) were studied with 1-(2-pyridylazo)-2-naphthol (PAN) at 60°C using paraffin wax as a diluent. The rate of extraction is first order with respect to metal ion and hydrogen ion in the aqueous phase and second order with respect to the extractant in the organic phase. The rate- determining step is the formation of an [RE(PAN)2]+ complex between RE3+ and PAN in the aqueous phase. The rate constant for the extraction was found to be about 1011 1 mol-1 s-1. The temperature dependence of extraction rate was determined and the activation parameters were calculated.

Original languageEnglish
Pages (from-to)1721-1725
Number of pages5
Issue number10
Publication statusPublished - Oct 1996


  • 1-(2-Pyridylazo)-2-naphthol
  • Kinetics
  • Rare Earths
  • Solid liquid extraction

ASJC Scopus subject areas

  • Analytical Chemistry

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