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
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.