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研究550-950°C下微波加热配碳还原焙烧分解铁酸锌生成ZnO和Fe3O4/FeO的工艺及机理。利用HSC热力学软件对铁酸锌分解的热力学温度进行计算,并利用碳气化控制、化学控制及扩散控制模型研究样品中铁酸锌分解的动力学行为。分析微波功率、反应温度、配碳比和时间对铁酸锌分解率的影响。结果表明:在微波加热温度750°C,C/ZnFe2O4质量比为1:3,粒径74~89μm,微波功率1.2 kW的条件下,被还原的铁酸锌样品经过浸出后,Zn的回收率可以高达97.93%。通过采用不同的动力学模型对分解动力学进行测试。结果表明:碳气化控制机制是良好的机制。碳气化反应的活化能为38.21 kJ/mol。
The process and mechanism of ZnO and Fe3O4 / FeO decomposition by microwave heating with carbon reduction roasting and decomposition of zinc ferrite at 550-950 ° C were studied. HSC thermodynamic software is used to calculate the thermodynamic temperature of zinc ferrite decomposition, and the kinetic behavior of zinc ferrite decomposition in the sample is studied by carbon vaporization control, chemical control and diffusion control model. The effects of microwave power, reaction temperature, carbon ratio and time on the decomposition rate of zinc ferrite were analyzed. The results showed that the recovery rate of Zn after the reduced zinc ferrite samples were leached by microwave heating at 750 ° C, mass ratio of C / ZnFe2O4 of 1: 3, particle size of 74 ~ 89μm and microwave power of 1.2 kW Up to 97.93%. Decomposition kinetics were tested by using different kinetic models. The results show that the mechanism of carbon gasification control is a good mechanism. The activation energy of the carbonization reaction is 38.21 kJ / mol.