Abstract：At present, the molybdenum oxide is firstly dissolved during the phase analysis of molybdenum ore in China. Then the molybdenum phase in residue is considered as molybdenum sulfide. For the complex molybdenum ore, however, partial insoluble colloidal molybdenum oxide would be calculated as molybdenum sulfide, leading to inaccurate measurement results and misdirection for the beneficiation process. Hence, how to accurately separate molybdenum sulfide and molybdenum in this part of insoluble ore has become an urgent issue in chemical phase analysis of molybdenum ore and beneficiation process. One molybdenum ore sample from a certain deposit containes colloidal molybdenum oxide which has a very complex contact relationship with rutile, and it cannot be leached using the traditional chemical phase analysis method. The molybdenum ore from this area was selected as the research object. The aqua regia was used as the leaching reagent for the separation of molybdenum sulfide and this part of colloidal molybdenum oxide. Consequently, the accurate quantitative analysis of molybdenum sulfide was achieved. The results showed that molybdenum sulfide could be well separated under the following leaching conditions: 45% (V∶V) aqua regia, reaction in water bath at 80℃ for 2.0h. The precision tests of determination results of various phases in molybdenum ore were conducted. The relative standard deviation (RSD) of molybdenum sulfide phase was 0.13%, while the RSD of molybdenum in insoluble residue was 1.84%. The sum of phases was consistent with the determination result of total molybdenum. Moreover, the distribution rate of molybdenum sulfide (69.56%) was in agreement with the result from mineral liberation analysis (MLA), i.e., 70%. The proposed method could correctly guide the mineral processing process.
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