Solvent extraction of tungsten by alkylamines hydrochloric acid and alkylamines-sulphuric acid systems
1991; Elsevier BV; Volume: 26; Issue: 2 Linguagem: Inglês
10.1016/0304-386x(91)90027-j
ISSN1879-1158
AutoresR.A. Guedes de Carvalho, M. N. Martins Sampaio,
Tópico(s)Inorganic and Organometallic Chemistry
ResumoThe extraction of W (VI) from 0.01 M aqueous solutions in hydrochloric and sulphuric media with various concentrations of Cl− (1 and 5 M), SO42− (1.36 M) and CO32− (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: NH4Cl, NaCl, NaOH, Na2CO3, (NH4)2CO3, equimolar NaOH + NaCl and NH4Cl+NH4 solutions with variable concentrations. The relative efficiency of the different extractants and stripping agents was compared.
Referência(s)