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

The possibility of preparing ammonium chloroplatinate powders by precipitat ion stripping from Pt-loaded Alamine 336 or TBP was investigated experiment ally. A similar examination was done for the precipitation stripping of Pd( II). Furthermore, the possible separation of Pt(TV) from Alamine 336, loade d with both Pt(IV) and Pd(II), was studied. Precipitation stripping of (NH4 )(2)PtCl6 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 fo und 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)(2)PtCl6 from Pt(IV) -loaded TBP was almost completely achieved using an aqueous NH3 solution co ncentrated above 2 kmol m(-3). Pt(IV) can be efficiently separated as (NH4) (2)PtCl6 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.