Kinetics of thermal decomposition reaction of pyrite roasted by microwave
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摘要: 黄铁矿在常规焙烧方式下热分解机理属于未反应缩合模型，利用实验室微波发生设备，在微波辐射下，对粒度为-0.074 mm的黄铁矿进行温度分别为600 ℃、650 ℃、700 ℃的恒温焙烧试验，研究了氩气焙烧气氛中黄铁矿纯矿物热分解的动力学机理，采用未反应缩核模型和均相反应模型对试验结果进行模拟。模拟结果表明微波辐射下黄铁矿热分解反应机理属于均相反应动力学模型，其机理函数方程为dx/dt=k(1-x)，与常规焙烧方式相比，微波焙烧黄铁矿热分解反应的活化能降低了148.65 kJ/mol，有利于黄铁矿热分解反应的进行。Abstract: The mechanism of the pyrite thermal decomposition toasted in conventional ways fitted to the unreacted core model.In this paper, the pure pyrite (-0.074 mm) was roasted respectively at the temperature of 600 ℃, 650 ℃ and 700 ℃ in the argon atmosphere in microwave oven.And the purpose of this paper is to make a research on the kinetics of thermal decomposition reaction of pyrite roasted by microwave.The test results were simulated by the unreacted core model and the homogeneous reaction model.The results indicate that the thermal decomposition of pyrite in microwave follows the homogeneous reaction model, and the mechanism function of this reaction is dx/t=k(1-x).Compared with conventional calcinations, microwave could reduce the activation energy of the reaction by 148.65 kJ/mol.
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Keywords:
- pyrite /
- microwave roasting /
- thermal decomposition /
- kinetics
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