In this paper, a new process of roasting molybdenum concentrates with the addition of molybdenum trioxide (MoO₃) was proposed. Using molybdenum disulfide (MoS₂) to represent molybdenum concentrates and based on theoretical studies and experimental investigations, the roasting behavior and reaction routes were identified by thermodynamic calculations, thermogravimetric analysis, and characterization of the reaction process and reaction products. The effects of the MoO₃/MoS₂ ratio, reaction time, and temperature as well as the forming pressure of pellets on the solid–solid reaction of MoO₃ and MoS₂ were investigated, and the products were characterized using X-ray diffraction, scanning electron microscopy, and carbon–sulfur analysis. The optimum MoO₃/MoS₂ ratio was determined as 6.5, and the optimum reaction conditions were a temperature of 650 °C and a holding time of 60 min. The particle size of MoO₂ increased gradually with the extension of the holding time, and finally, MoO₂ particles with a particle size of 1.1 μm could be obtained. The sulfur content of the product MoO₂ decreased significantly with the increase in the MoO₃/MoS₂ ratio or reaction temperature, and after this desulfuration process, the minimum sulfur content of the products was 98 ppm. Comparing powder samples with molded samples formed at 50 MPa revealed that a certain pressure promoted the reaction with an efficiency increase of about 14.6%.

中文翻译：

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三氧化钼和钼精矿混合物的焙烧行为研究

本文提出了一种添加三氧化钼(MoO _{3 )焙烧钼精矿的新工艺。}以二硫化钼(MoS ₂ )为代表的钼精矿，在理论研究和实验研究的基础上，通过热力学计算、热重分析、反应过程和反应产物的表征，确定了焙烧行为和反应路线。_{MoO 3} /MoS ₂比、反应时间、温度以及球团成型压力对MoO ₃和MoS ₂固-固反应的影响进行了研究，并使用 X 射线衍射、扫描电子显微镜和碳硫分析对产物进行了表征。确定最佳MoO ₃ /MoS _{2比为6.5，最佳反应条件为温度650 ℃，保温时间60 min。随着保温时间的延长，MoO 2}的粒径逐渐增大，最终得到粒径为1.1 μm的MoO _2颗粒。随着MoO ₃ /MoS ₂的增加，产物MoO _{2的硫含量显着降低}比例或反应温度，并且在该脱硫过程之后，产品的最低硫含量为98ppm。将粉末样品与在 50 MPa 下形成的成型样品进行比较表明，一定的压力促进了反应，效率提高了约 14.6%。