In this study, a modified fluidized bed reactor was used to roast pyrite concentrate (PC). To analyze the pyrite conversion and fluid flow in the bed, a 2D model incorporating the Euler–Euler method and the conservation equation of chemical species was employed. In addition, the reactant and product samples were characterized through X-ray diffraction (XRD), X-ray fluorescence (XRF), particle size distribution, and thermogravimetric analyses (TGA). The kinetic parameters of the pyrite decomposition were also determined. The isoconversional method was used to determine the activation energy, pre-exponential factor of the specific reaction-rate equation, and reaction mechanism from thermogravimetry results. This rate law was then applied in the model to account for the depletion of pyrite in the modified fluidized bed. The main crystallographic phase in the formed product was hematite. XRF and TGA result indicate that the PC had high purity and roasting occurred at a conversion of 80 %. The pyrite decomposition kinetics showed activation energy varies from 33.2 to 281.4 kJ∙mol⁻¹ depending on the stage. The kinetic analysis of roasting and its implementation in the model demonstrated that the simulation achieved 72 % PC conversion into the products. These results validate the experimental conversion, illustrating the compatibility of the model with the experimental data. Specifically, the coupling of the rate law from TGA with the dispersed-phase velocity vector encourages to new research possibilities in this field of chemical engineering.

在这项研究中，改进的流化床反应器用于焙烧黄铁矿精矿 (PC)。为了分析黄铁矿转化率和床中的流体流动，采用了结合欧拉-欧拉方法和化学物种守恒方程的二维模型。此外，通过 X 射线衍射 (XRD)、X 射线荧光 (XRF)、粒度分布和热重分析 (TGA) 对反应物和产物样品进行了表征。还确定了黄铁矿分解的动力学参数。采用等转化法从热重分析结果确定活化能、特定反应速率方程的指前因子和反应机理。然后在模型中应用该速率定律来解释改性流化床中黄铁矿的消耗。形成的产品中的主要结晶相是赤铁矿。XRF 和 TGA 结果表明 PC 具有高纯度，并且在 80 % 的转化率下发生了焙烧。黄铁矿分解动力学显示活化能从 33.2 变化到 281.4 kJ∙mol^-1取决于阶段。焙烧的动力学分析及其在模型中的实施表明，模拟实现了 72% 的 PC 转化为产品。这些结果验证了实验转换，说明了模型与实验数据的兼容性。具体来说，来自 TGA 的速率定律与分散相速度矢量的耦合鼓励了该化学工程领域的新研究可能性。