Abstract The thermal decomposition kinetics of arsenopyrite in arsenic-bearing refractory gold sulfide concentrates in a nitrogen atmosphere was studied, which using TG-DTG method at heating rates of 5, 10, 15, and 20 K/min. The reaction consistes of four steps, of which the second step involves arsenopyrite decomposition. In this study, we focus on the thermal decomposition kinetics of arsenopyrite. The apparent activation energy (E), pre-exponential factor (A), and reaction mechanism model were obtained by employing data comparison of Kissinger-Akahira-Sunose, Flynn-Wall-Ozawa, and Coats-Redfern methods. The kinetics mechanism was verified by scanning electron microscopy-backscattered electron imaging. The thermal decomposition of arsenopyrite was initiated at the surface and extended to the crystal nucleus, with the pyrrhotite in situ forming a porous structure. The reaction model was consistent with ‘Jander’s 3D diffusion equation model’. The equations for the thermodynamic activation parameters and the absolute temperature was established, and the parameter values were calculated at different characteristic temperatures.

中文翻译：

---

含砷难熔硫化金精矿中毒砂在氮气氛下的热分解动力学

摘要 采用TG-DTG法，在5、10、15、20 K/min的升温速率下，研究了含砷难熔硫化金精矿中砷黄铁矿在氮气氛下的热分解动力学。该反应由四步组成，其中第二步涉及毒砂分解。在这项研究中，我们关注毒砂的热分解动力学。采用 Kissinger-Akahira-Sunose、Flynn-Wall-Ozawa 和 Coats-Redfern 方法的数据比较，得到表观活化能 (E)、指前因子 (A) 和反应机理模型。通过扫描电子显微镜-背散射电子成像验证了动力学机制。毒砂的热分解从表面开始并扩展到晶核，磁黄铁矿原位形成多孔结构。反应模型与“Jander 的 3D 扩散方程模型”一致。建立了热力学活化参数和绝对温度的方程，计算了不同特征温度下的参数值。