Extraction and Separation of Platinum (IV), and Palladium (II) with CYANEX 923 in Chloride Media— A Possible Recovery from Spent Autocatalysts

834-837Extraction and separation of Pt(IV) and Pd(II) was carried out with Cyanex 923 in chloride media. Pt (IV) was quantitatively extracted from 3.0- 8.0 M HCI in the presence of 0.01 M SnCl2 while Pd (II) from 4.0-5.0 M HCI with 5×10-3 M Cyanex 923 in toluene. Pt (IV) was then quantitatively stripped from the organic phase with 5.0 M HNO3 while Pd (II) was quantitatively stripped with 1:1 HCI + HCIO4 in single step and also with 7.0 M HCIO4 in two steps. Pt (IV) was also extracted without using SnCI2 as a labilising agent with 0.1 M Cyanex 923 in toluene at 2.0-3.0 M HCI. Separation of Pt (IV) and Pd (II) was observed in various ratios. The methods developed were applied to the recovery of these metal ions from a synthetic solution of similar in composition to that of leaching of spent autocatalysis in 6.0 M HCI