【China Molybdenum Industry News Network】
The research are attained by treating the molybdenum ore with certain sodium compounds, preferably with sodium nir, trate or sodium hydroxide, for example, and heating the mixture to the temperature range which is necessary to promote the desired reaction. In the case of sodium nitrate this temperature is considerably above the melting point of 355 the salt. In this manner sodium molybdate is obtained which is then extracted and purified as described below.
The ore is first pulverized to 60 to 80 mesh, and then mixed with dry sodium compound, preferably Chile saltpeter (NaN03). I have found that a sufficient amount of the nitrate is about five times the weight of molybdenum present in the ore. When caustic soda is used, a suitable amount is about 2.5 times the weight of the molybdenum present in the ore. A preferred method of employing the latter reagent is to dissolve it in the least amount of water required to moisten the ore uniformly, when thoroughly mixed therewith.
The mixture obtained by either of the above methods is then heated at least to the temperature of reaction of the sodium compound, to produce sodium molybdate. I have found 7000 C. to be satisfactory in the case of NaNO3. This temperature is maintained until the formation of sodium molybdate is completed. The time required has been found to be about one hour. It is not necessary to stir or rabble the ore mixture during this step.
The sintered ore is then leached with water and filtered. It has been found to be unnecessary to remove the last traces of solid matter at this stage.
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