Process for selectively removing molybdenum from liquid mixtures containing it together with vanadium
AssigneesENI S.p.A., Snamprogetti S.p.A., Enitecnologie S.p.A.
InventorsEmilio Sentimenti, Nicoletta Panariti
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Abstract
Process for selectively removing molybdenum from liquid mixtures containing it, in a quantity greater than (200) mg/l, together with vanadium characterized in that it comprises the following steps: bringing the liquid mixture to a pH of less than (3); adding a solution of an alkaline xanthate to the solution so that the molar ratio molybdenum/alkaline xanthate ranges from (¼) to (⅛), maintaining the pH constant by means of the addition of an inorganic acid; stirring the mixture causing the precipitation of the molybdenum present in the mixture.
Claims10
A process for selectively removing molybdenum from a liquid mixture comprising molybdenum and vanadium,
- wherein the concentration of the molybdenum in the liquid mixture is greater than 200 mg/l,
- the process comprising
- bringing the liquid mixture to a pH of ≦2;
- adding a solution comprising an alkaline xanthate to the liquid mixture, so that the molar ratio of the molybdenum to the alkaline xanthate ranges from ¼ to ⅛ in the liquid mixture,
- maintaining constant pH of the liquid mixture by addition of an inorganic acid, as needed, to maintain constant pH, and
- stirring the liquid mixture, thereby selectively precipitating and removing the molybdenum from the vanadium in the mixture.
Dependencies are inferred from the claim text.