Process for the Recovery of Molybdenum From Roasted Molybdenum Concentrates
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- Category: Molybdenum knowledge
- Published on 28 October 2014
- Written by luya
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A process for recovering molybdenum, either as a compound or as the elemental metal, from roasted molybdenum concentrates, e.g. resulting from the roasting of molybdenum sulfide compositions, comprises digesting the concentrate in aqueous nitric acid containing ammonium nitrate, separating the solid phase from the liquid phase, and treating the solid phase with alkali, preferably ammonium hydroxide, to produce ammonium molybdate. The latter may be converted into metallic molybdenum.
A method of recovering roasted molybdenum concentrate containing molybdenum in the presence of impurities, said method comprising the steps of:
a. digesting the roasted concentrate in an aqueous nitric acid solution containing ammonium nitrate at an elevated temperature;
b. separating the digested concentrate from the nitric acid solution to yield a solid product; and
c. washing said solid product with hot water, said concentrate being digested in step (a) for a period of about two hours, said solution contains about 2.0 to 2.3 moles/liter of free nitric acid and about 1.5 to 2.0 moles/liter of ammonium nitrate, and said temperature is substantially 75C to 80C, said concentrate is a roasted molybdenum sulfide ore containing impurities selected from the group which consists of copper, lead, zinc, bismuth and alkali metals.
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