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Preparation of ammonium chloroplatinate by a precipitation stripping of Pt(IV)-loaded alamine 336 or TBP


The possibility of preparing ammonium chloroplatinate powders by precipitation stripping from Pt-loaded Alamine 336 or TBP was investigated experimentally. A similar examination was done for the precipitation stripping of Pd(II). Furthermore, the possible separation of Pt(IV) from Alamine 336, loaded with both Pt(IV) and Pd(II), was studied. Precipitation stripping of (NH4)2PtCl6 from Pt(IV)-loaded Alamine 336 was possible using an aqueous NH3 solution and aqueous mixed solutions of NH3-NH4Cl or NH4Cl-HClO4. It was found that the use of 0.2 kmol m−3 HClO4-2 kmol m−3 NH4Cl as a stripping solution was most effective. The precipitation of (NH4)2PtCl6 from Pt(IV)-loaded TBP was almost completely achieved using an aqueous NH3 solution concentrated above 2 kmol m−3. Pt(IV) can be efficiently separated as (NH4)2PtCl6 precipitates from both Pt(IV) and Pd(II)-loaded Alamine 336, using 0.2 kmol m−3 HClO4-4 k mol m−3 NH4Cl, with soluble Pd(II) remaining in both the aqueous and organic phases.

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Sanuki, S., Matsumoto, Y. & Majima, H. Preparation of ammonium chloroplatinate by a precipitation stripping of Pt(IV)-loaded alamine 336 or TBP. Metall Mater Trans B 30, 197–203 (1999).

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  • Material Transaction
  • Organic Phase
  • Aqueous Mixed Solution
  • Percent Precipitation
  • Precipitation Stripping