Recovery and Then Individual Separation of Platinum, Palladium, and Rhodium from Spent Car Catalytic Converters Using Hydrometallurgical Technique followed by Successive Precipitation Methods

Table 2

Effect of the various variables examined during leaching process on the PGM leaching efficiencies.

Variables studied				Leaching efficiency (%)
Temp. (°C)	H2O2 (vol%)	[HCl] (M)	Time (hours)	Rh	Pt	Pd
60	0.2	11.92	3.0	48	53	67
60	0.3	11.88	3.0	61	67	78
60	0.4	11.84	3.0	71	76	87
60	0.5	11.80	3.0	80	89	93
60	0.8–2.4	11.68–11.36	3.0	88-89	96-97	100
60	0.8	1.00	3.0	20	30	60
60	0.8	2.00	3.0	38	47	69
60	0.8	3.00	3.0	52	63	77
60	0.8	5.00	3.0	64	76	85
60	0.8	6.00	3.0	73	83	90
60	0.8	7.00	3.0	80	90	95
60	0.8	9.00–11.68	3.0	86–88	96	98–100
20	0.8	9.00	3.0	40	70	75
30	0.8	9.00	3.0	54	79	83
40	0.8	9.00	3.0	66	86	89
50	0.8	9.00	3.0	77	92	94
60–80	0.8	9.00	3.0	86–90	96	98-99
60	0.8	9.00	0.5	35	50	60
60	0.8	9.00	1.0	60	73	76
60	0.8	9.00	1.5	75	90	93
60	0.8	9.00	2.0	80	95	98
60	0.8	9.00	2.5–3.0	86	96	98