【China Molybdenum Industry News Network】
The research relates to ore treatments, and more particularly to improved methods of producing molybdenum compounds from wulfenite ores by reacting these ores with sodium compounds. It is to produce substantially pure molybdenum compounds from wulfenite ore in a more economic and efficient manner.
Another object of the iresearch 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 research 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. This envelope considerably retarded or entirely prevented the solution reaction. In order partly to overcome this, it was necessary to crush the ore to a grain size of about 200 mesh more or less. I have discovered that it is possible to obtain a 100% extraction of the molybdenum contained in wulfenite, without its being necessary to crush the ore to a fineness beyond 60 to 80 mesh (0.246 to 0.175 millimeter sieve opening), while at the R. same time the molybdate obtained is purer than that obtained by prior art methods.
This improved result may be due to the fact that there is no formation of an interfering lead compound during the first step in the process as practiced 04i by me. Such a water-insoluble lead compound is formed in the case of sulphide, sulphate and carbonate reagents used heretofore. However, this explanation of the reason why it is not necessary to crush the ore fine is merely a theory.
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