The role of the sulfide ion in the solvent extraction of molybdenum from alkaline solution containing tungsten

Citation
R. Mirvaliev et K. Inoue, The role of the sulfide ion in the solvent extraction of molybdenum from alkaline solution containing tungsten, SOL EX R D, 8, 2001, pp. 9-20
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry,"Chemical Engineering
Journal title
SOLVENT EXTRACTION RESEARCH AND DEVELOPMENT-JAPAN
ISSN journal
1341-7215 → ACNP
Volume
8
Year of publication
2001
Pages
9 - 20
Database
ISI
SICI code
1341-7215(2001)8:<9:TROTSI>2.0.ZU;2-7
Abstract
Trioctylmethylammonium chloride (TOMAC) diluted with p-xylene was employed as the extracting agent for the recovery of molybdenum from alkaline soluti on containing an excess of sodium tungstate. The separation was found to be effective only when sulfide ions were added and sulfidization provided com plete and selective conversion of molybdate ion to thiomolybdate. Optimizat ion of the sulfidization process was carried out resulting in preferential molybdenum extraction at pH 8.5 - 9. To enhance the separation efficiency, the conditions of a novel selective stripping method with sodium nitrite so lution have also been briefly discussed.