钼精矿氧化焙烧工艺在工业应用中具有显著的优势.然而,低品位钼精矿因其比标准钼精矿复杂得多而在应用过程中存在许多问题.通过热力学计算、焙烧实验、热重分析和物相分析等,研究粉状含铼低品位钼精矿的氧化行为.结果表明,MoS2从450℃氧化,当温度达到600℃时,MoO3与金属氧化物反应并形成钼酸盐.最终,由于不可溶的钼酸盐生成,约80％的MoO3溶解氨水中.由于Re2O7、MoS2和SO2之间互相反应生成低价铼氧化物ReO2和ReO3,铼的挥发速度远落后于钼的氧化速度.当MoS2氧化完全后,铼的挥发加强,最终铼挥发率接近70％.查明了低品位钼精矿在焙烧过程中钼、铼氧化效率低的主要原因,为后续强化钼、铼的提取奠定了基础.%The oxidation roasting process of molybdenum concentrate has significant advantages in industrial applications. However, utilization of low-grade mineral has many problems because it is more complex than the standard concentrate. In this study, the oxidation behaviors of powdery rhenium-bearing low-grade molybdenum concentrate were investigated through thermodynamic calculation, roasting experiments, thermogravimetric analysis, and phase analysis. The results obtained show that oxidation of MoS2 begins at 450 ℃, and MoO3 reacts with metal-oxide forming molybdate at 600 ℃. Finally, MoO3 can be dissolved in ammonia with a maximum content of approximately 80％. The volatile speed of Re was considerably slower than the oxidation speed of MoS2 because the nonvolatile products ReO2 and ReO3 were generated in reactions among MoS2, SO2, and Re2O7. The final volatilization rate of Re was almost 70％. This study determined the problems related to the roasting of low-grade molybdenum concentrate, which lays the scientific foundations for subsequent enhancement of molybdenum and rhenium extraction.
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