S. Sanuki et al., Preparation of ammonium chloroplatinate by a precipitation stripping of Pt(IV)-loaded Alamine 336 or TBP, MET MAT T B, 30(2), 1999, pp. 197-203
Citations number
10
Categorie Soggetti
Metallurgy
Journal title
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
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.