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采用热分析法研究了黄铁矿的氧化反应历程,得出升温速率分别为5℃/min、10℃/min和15℃/min条件下的TG-DTG曲线和表征参数;通过耦合Popescu法、Coats-Redfem法及Flynn-Wall-Ozawa法确定了黄铁矿氧化反应机理的模式函数为Avrami-Erofeev方程(n=3/2),符合随机成核和随后生长机理,3种升温速率下的活化能分别为230.2 k J/mol、198.8 k J/mol和187.4 k J/mol,指前因子分别为2.06×1010s-1、1.28×108s-1和1.43×107s-1;根据活化络合物理论,活化能和指前因子之间存在补偿效应,其动力学补偿方程为ln A=0.16729E-14.72689。
The pyrolysis reaction of pyrite was studied by thermal analysis. The TG-DTG curves and characterization parameters were obtained at 5 ℃ / min, 10 ℃ / min and 15 ℃ / min respectively. Through the coupled Popescu method, Coats-Redfem method and Flynn-Wall-Ozawa method were used to determine the model function of the oxidation reaction mechanism of pyrite as Avrami-Erofeev equation (n = 3/2), which accords with the mechanism of random nucleation and subsequent growth. The activation energies were 230.2 kJ / mol, 198.8 kJ / mol and 187.4 kJ / mol, and the pre-exponential factors were 2.06 × 1010s-1, 1.28 × 108s-1 and 1.43 × 107s- The theoretical, activation energy and pre-extinction factor exist between the compensation effect, the kinetic compensation equation ln A = 0.16729E-14.72689.