Corresponding author: GUO Pei-min (1975-), male, Doctor, Professor; E-mail:guopm@pku.org.cn heating after oxidation roasting of molybdenite, whose purity is usually 99.8%. This method has a very high demand for raw materials, especially low melting point and volatile nonferrous metal elements. The traditional oxidation roasting of molybdenite is to oxidize MoS2 at low temperature, and produces wrought molybdenum concentrate. Due to low reaction temperature, the nonferrous metal elements such as Pb, Zn, As, Sb, etc. in ore remain in the molybdenum oxide ore after oxidation roasting. Parts of the nonferrous metal elements are hard to remove by chemical methods, and the particle size of MoO3 is a few microns- dozens microns of nanometers in size. MoO3 becomes gas by sublimation, and parts of the nonferrous metal elements also become gas and enter into gaseous MoO3.Therefore, the above two processes need oxidizing roasting of molybdenite, but SO2 releasing during oxidizing roasting seriously pollutes the atmospheric environment. Although SO2 in tail gas can also be processed without public hazards, there are many problems in it, for example, complicated technology, high cost and low purity etc.
