The separation of palladium and platinum by ion flotation |
| |
Authors: | Eugene W Berg Daniel M Downey |
| |
Institution: | Chemistry Department, Louisiana State University, Baton Rouge, LA 70803 U.S.A.;Chemistry Department, West Virginia University, Morgantown, WV 26506 U.S.A. |
| |
Abstract: | Differences in the ion flotation properties of palladium(II) and platinum(IV) chloro complexes in aqueous solutions are used to achieve separations of these metals. The anionic chloro complex PtCl2-6 is floated selectively with cationic surfactants of the type, RNR'3Br, from solutions of PdCl2-4 and various concentrations of hydrochloric acid. The palladium(II) does not float from solutions of ? 3.0 M HCl and the platinum(IV) floated from these solutions can be recovered free of palladium. However, the separation is incomplete as much of the platinum(IV) is also unfloated from these solutions. Quantitative separations are obtained by conversion of the palladium(II) to the cationic ammine, Pd(NH3)42+ with aqueous ammonia prior to flotation. The anionic chloro complex of platinum(IV) is unaffected by the presence of ammonia and is floated quantitatively with the surfactant n-hexadecyltri-n-propylammonium bromide from 0.01 M ammonia solutions. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|