Thermodynamics for reduction of molybdenum oxides by aluminum and silicon were calculated, and the results show that reduction reaction is feasible at a certain temperature region. Compared to the presence of CaO or CaCO_3, reduction products of molybdenum trioxide with aluminum and silicon at various temperatures were detected by X-ray diffraction(XRD). Results show that molybdenum trioxide is reduced by aluminum or silicon step by step, and the intermediate product is MoO_2. At 1000 ℃, molybdenum trioxide could be reduced to metal Mo by aluminum, and in the presence of CaO, metal Mo as the reduction product appears even at 800 ℃. In contrast,silicon could barely reduce molybdenum trioxide to metal Mo even at 1200 ℃. In the presence of CaO or CaCO_3, reducibility of silicon increases significantly, and the reduction products are metal Mo and MoSi_2. Altogether, CaO or CaCO_3 performs two major roles in reduction process: restraining sublimation of MoO_3 and decreasing the temperature of reducing MoO_3 to metal Mo.
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机译:江西金溪熊家山钼矿床微量元素地球化学特征及成矿机理The Trace Elements Geochemical Characteristics and Formation Mechanism of Xiongjiashan Molybdenum Deposit, Jinxi, Jiangxi Province