METHOD OF SEPARATING PLATINUM (II, IV) AND PALLADIUM (II) FROM SILVER (I), IRON (III) AND COPPER (II) IN HYDROCHLORIC ACID SOLUTIONS Russian patent published in 2019 - IPC C22B11/00 C22B3/24 

FIELD: chemical or physical processes.

SUBSTANCE: invention relates to separation and concentration and can be used for separation of platinum metals from silver, iron and copper in hydrochloric acid solutions by sorption method. Pt (II, IV) and Pd (II) are separated from Ag (I), Fe (III) and Cu (II) by sorption from freshly prepared hydrochloric acid solutions using Purolite S985 anionite as a sorbent in chloride form and subsequent desorption of platinum metals with thiourea solution at temperature of 18 °C. Sorption and desorption are carried out under dynamic conditions. Corbtion is carried out in the concentration range: HCl 0.01–4.0 mol/l, Cu (II) – 3.125 mmol/l, Ag (I) – 0.95 mmol/l, Pt (II, IV) – 0.25 mmol/l, Pd ( II) – 0.25 mmol/l, Fe (III) – 0.25 mmol/l. Desorption is carried out by successively passing corresponding solutions of eluents through a layer of anionite, saturated with metal ions, wherein copper is desorbed first with 2.0 M HNO₃ solution and initial concentration of Cu (II) 3.125 mmol/l, then iron and silver solution of 10.0 % ammonia with initial concentrations of Fe (III) and Ag (I) 0.25 mmol/l and 0.95 mmol/l respectively. Desorption of platinum and palladium is carried out at initial concentration of Pt (II, IV) and Pd (II) 0.25 mmol/l.

EFFECT: method increases degree of extraction and desorption of metal ions while simplifying the process.

1 cl, 1 dwg, 3 tbl, 1 ex