Abstract
The extraction of W (VI) from 0.01 M aqueous solutions in hydrochloric and sulphuric media with various concentrations of Cl − (1 and 5 M), SO 4 2− (1.36 M) and CO 3 2− (0.05, 0.1, 1, 5 and 25% (w/v) ions by chloride and sulphate salts of primary (Primene JM-T), secondary (Amberlite LA 2) and tertiary (Alamine 336) amines and a quaternary ammoniu m salt (Aliquat 336), was studied at three pH values (2, 7 and 12), using a 9:1 mixture of kerosene and isodecanol as solvent. The tungsten stripping from the resultant pregnant organic solutions at pH 2 was carried out using: NH 4Cl, NaCl, NaOH, Na 2CO 3, (NH 4) 2CO 3, equimolar NaOH + NaCl and NH 4Cl+NH 4 solutions with variable concentrations. The relative efficiency of the different extractants and stripping agents was compared.
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