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 Ptloaded Alamine 336 or TBP was investigated experimentally. A similar examination was done for the precipitation stripping of Pd(ll). Furthermore, the possible separation of Pt(IV) from Alamine 336, loaded with both Pt(IV) and Pd(ll), was studied. Precipitation stripping of (NH4)2PtC(6) from Pt(IV)-loaded Alamine 336 was possible using an aqueous NH(3) solution and aqueous mixed solutions of NH(3)-NH(4)CI or NH(4)CI-HCIO(4). It was found that the use of 0.2 kmol m^-3 HCIO(4)-2 kmol m^-3 NH4CI as a stripping solution was most effective. The precipitation of (NH(4)2PtCI(6) from Pt(IV)loaded TBP was almost completely achieved using an aqueous NF^ solution concentrated above 2 kmol m^. Pt(IV) can be efficiently separated as (NH(4)2PtC(6) precipitates from both Pt(IV) and Pd(ll)loaded Alamine 336, using 0.2 kmol m^-3 HCIO(4) k mol m^-3 NH(4)CI, with soluble Pd(ll) remaining in both the aqueous and organic phases.