Science China Chemistry

, Volume 59, Issue 4, pp 497–504 | Cite as

Modeling for tungstic precipitation and extraction based on Pitzer equation

  • Xinyue Zhang
  • Pengge Ning
  • Weifeng Xu
  • Hongbin Cao
  • Yi Zhang
Articles

Abstract

This work presented the results of tungstic precipitation from Na2WO4-Na2SO4-H2O system at 293.15 K, with which the Pitzer parameters of \(\beta _{N{a_2}W{O_4}}^{\left( 0 \right)}\) and \(\beta _{N{a_2}W{O_4}}^{\left( 1 \right)}\) were determined from Pitzer equation by regression. Thus the mean ionic activity coefficients of sodium tungstate were calculated. The obtained \(\beta _{N{a_2}W{O_4}}^{\left( 0 \right)}\) and \(\beta _{N{a_2}W{O_4}}^{\left( 1 \right)}\) were substituted as fixed values in extraction modeling from Na2WO4-H2SO4-H2O system by primary amine (N1923) in toluene as diluent. Meanwhile the activity coefficient expressions in organic phase were varied based on Pitzer theory that the interaction term for the solvent should not be included. The Pitzer parameters for organic phase were re-regressed in order to make the model more accurate. The average absolute relative deviation (AARD) for calculated and experimental molality of WO42− in aqueous phase was 5.24%. The results showed that the model can not only correlate but also predict the liquid-liquid equilibrium (LLE) data.

Keywords

tungstic precipitation Pitzer parameter activity coefficient extraction 

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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Xinyue Zhang
    • 1
    • 2
    • 3
  • Pengge Ning
    • 2
  • Weifeng Xu
    • 2
  • Hongbin Cao
    • 2
  • Yi Zhang
    • 1
    • 2
    • 3
  1. 1.School of Chemical Engineering and Technology, National Engineering Research Center of Distillation TechnologyTianjin UniversityTianjinChina
  2. 2.Research Centre for Process Pollution Control, Institute of Process EngineeringChinese Academy of SciencesBeijingChina
  3. 3.Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)TianjinChina

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