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Why must the temperature stay below 650 °C when molybdenite is roasted?
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During the roasting of molybdenite concentrate, the temperature must be kept below 650 °C (1,200 °F) to prevent the sublimation of molybdenum trioxide (MoO₃). At this temperature threshold, the compound begins to vaporize directly from the solid state, which would result in material loss during the conversion process.1