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有机磷(膦)酸对碱土金属的萃取

许新; 朱屯   

  1. Institute of Process Engineeringformerly Institute of Chemical Metallurgy, Chinese Academy
    of Sciences, Beijing 100080, China
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2002-02-28 发布日期:2002-02-28
  • 通讯作者: 许新

Solvent Extraction of Alkaline Earth Metals with Alkylphosphorus Acids

XU Xin; ZHU Tun   

  1. Institute of Process Engineeringformerly Institute of Chemical Metallurgy, Chinese Academy
    of Sciences, Beijing 100080, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2002-02-28 Published:2002-02-28
  • Contact: XU Xin

摘要: Solvent extraction equilibria of four main alkaline earth metals (magnesium, calcium,
strontium and barium) with di(2-ethylhexyl) phosphoric acid (DEHPA), 2-ethylhexyl
phosphonic acid mono-(2-ethylhexyl) ester,di(2,4,4-tri-methylpentyl) phosphinic acid and IR
spectra of the extracts have been studied. The selectivity order is dependent on the e/r
value and hydration energy of the metal ions. The minor shift of the P-O in IR absorption
of the alkaline earth metal extracts indicates that the interaction between the metal ions
and P-O is much weaker for alkaline earth metals than for transitional metals. The
distribution of the four alkaline earth elements between aqueous solutions and solutions of
DEHPA and neutral organophosphorus compounds, tri-n-butyl phosphate (TBP) or tri-octyl
phosphine oxide (TOPO) in kerosene have been determined at varying ratio of TBP or TOPO to
DEHPA and the positive synergism is observed. The synergic effect is explained by using IR
spectra of the loaded organic phase.

关键词: solvent extraction;alkaline earth metals;di(2-ethylhexyl) phosphoric acid (DEHPA)

Abstract: Solvent extraction equilibria of four main alkaline earth metals (magnesium, calcium,
strontium and barium) with di(2-ethylhexyl) phosphoric acid (DEHPA), 2-ethylhexyl
phosphonic acid mono-(2-ethylhexyl) ester,di(2,4,4-tri-methylpentyl) phosphinic acid and IR
spectra of the extracts have been studied. The selectivity order is dependent on the e/r
value and hydration energy of the metal ions. The minor shift of the P-O in IR absorption
of the alkaline earth metal extracts indicates that the interaction between the metal ions
and P-O is much weaker for alkaline earth metals than for transitional metals. The
distribution of the four alkaline earth elements between aqueous solutions and solutions of
DEHPA and neutral organophosphorus compounds, tri-n-butyl phosphate (TBP) or tri-octyl
phosphine oxide (TOPO) in kerosene have been determined at varying ratio of TBP or TOPO to
DEHPA and the positive synergism is observed. The synergic effect is explained by using IR
spectra of the loaded organic phase.

Key words: solvent extraction, alkaline earth metals, di(2-ethylhexyl) phosphoric acid (DEHPA)