【China Molybdenum Industry News Network】
The present invention relates to ore treatments, and more particularly to improved methods of producing molybdenum compounds from wulfenite ores by reacting these ores with sodium compounds.
An object of this invention is to produce substantially pure molybdenum compounds from wulfenite ore in a more economic and efficient manner.
Another object of the invention is to treat wulfenite ore with sodium compounds in such a manner that any undecomposed excess of the reagent used produces no insoluble or contaminating compound in the product obtained.
A further object of this invention is to extract molybdenum from wulfenite ore, with a high percentage yield of extraction, without requiring the high degree of comminution necessary heretofore.
Heretofore when treating molybdenum ores such as wulfenite (PbMoO4) with aqueous solutions of NaOH, Na2CO3, or Na2S, the lead contained in the ore was converted into an insoluble lead compound which formed an envelope on the surface of the wulfenite grains.
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