Process for the separate recovery of molybdenum and vanadium

摘要

The invention relates to a process for recovering and purifying the molybdenum from a solution containing more molybdenum than vanadium. The process of the invention comprises the step of contacting the solution which contains molybdenum and vanadium, originally at a pH at least equal to 11 with an excess of an ammonium salt sufficient to precipitate the greatest part of vanadium in the form of solid ammonium vanadate, this excess being yet hot higher than a value such that after precipitation of vanadium, the quantity of ammonium having not reacted with the vanadate would be over a concentration which would account for risks of precipitating also molybdenum which is contained in the liquid phase of the supernatant. The molybdenum which is obtained is of industrial grade.