X-ray powder diffraction, scanning electron microscopy, energy dispersive spectroscopy, thermogravimetry, differential scanning calorimetry, and mass spectrometry have been used to study the products of nickel-containing pyrrhotite tailings oxidation by oxygen in the air. The kinetic triplets of oxidation, namely, activation energy (E_a), pre-exponential factor (A), and reaction model (f(α)) being a function of the conversion degree (α), were adjusted by regression analysis. In case of a two-stage process representation, the first step proceeds under autocatalysis control and ends at α = 0.42. The kinetic triplet in the first step is E_a = 262.2 kJ/mol, lg A = 14.53 s⁻¹, and f(α) = (1 − α)^4.11(1 + 1.51 × 10⁻⁴α). For the second step, the process is controlled by the two-dimensional diffusion of the reactants in the layer of oxidation products. The kinetic triplet in the second step is E_a = 215.0 kJ/mol, lg A = 10.28 s⁻¹, and f(α) = (−ln(1 − α))⁻¹. The obtained empirical formulae for the rate of pyrrhotite tailings oxidation reliably describe the macro-mechanism of the process and can be used to design automatization systems for roasting these materials.

X射线粉末衍射、扫描电子显微镜、能量色散谱、热重法、差示扫描量热法和质谱法已被用于研究空气中氧气氧化含镍磁黄铁矿尾矿的产物。氧化的动力学三元组，即活化能 ( E _a )、指前因子 ( A ) 和反应模型 ( f ( α )) 作为转化度 ( α )的函数，通过回归分析进行调整。在两阶段过程表示的情况下，第一步在自催化控制下进行，并在α = 0.42处结束。第一步中的动力学三元组是E _a= 262.2 kJ/mol，lg A = 14.53 s ^-1，并且f ( α ) = (1 − α ) ^4.11 (1 + 1.51 × 10 ^-4 α )。对于第二步，该过程由反应物在氧化产物层中的二维扩散控制。第二步中的动力学三元组为E _a = 215.0 kJ/mol，lg A = 10.28 s ^-1和f ( α ) = (-ln(1 - α )) ^-1. 获得的磁黄铁矿尾矿氧化率经验公式可靠地描述了该过程的宏观机制，可用于设计焙烧这些材料的自动化系统。