Purification of Sulphate Leach Liquor of Spent Raneynickel Catalyst Containing Al and Ni by Solvent Extraction with Organophosphorus-Based Extractants

Table 2

Effect of phase ratio on Al stripping from loaded organic (L.O). Al in L.O = 6.47 g/L H₂SO₄; 1 M, time: 15 min.

Extractant	Phase ratio (O : A)	Al stripping efficiency (%)	Theoretical number of stages to get >99% efficiency
PC 88 A	1.0 : 1	99.6	1
	1.5 : 1	95.9	2
	2.0 : 1	80.0	3
	2.5 : 1	71.0	4
	3.0 : 1	61.3	5