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Kinetics of carbothermic reduction of synthetic chromite

机译:合成铬铁矿碳热还原的动力学

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In order to optimize the current reduction process of chromite, a good knowledge of reduction mechanism involved is required. The basic component in chromite ore is FeCr2O4, thus, kinetic investigation of synthetic FeCr2O4 with different amount of carbon were carried out in the temperature range of 1473K to 1673K under both isothermal and non-isothermal mode. The iron can be easily reduced compared with chromium. And higher reduction degree of chromite can be achieved by increasing temperature and carbon content. With the supporting of X-ray Diffraction and Scanning Electron Microscope methods, the formation of metallic products followed the sequence: Fe-C alloy, (Fe,Cr)7C3and Fe-Cr-C alloy. Kinetics analysis showed that the first stage was controlled by nucleation with an apparent activation energy of 120kJ/mol, while the chromium reduction was controlled by crystallochemical transformation with an apparent activation energy of 288kJ/mol.
机译:为了优化当前的铬铁矿还原工艺,需要对还原机理有充分的了解。亚铁矿石中的基本成分是FeCr2O4,因此,在等温和非等温模式下,在1473K至1673K的温度范围内,对碳含量不同的合成FeCr2O4进行了动力学研究。与铬相比,铁很容易还原。通过提高温度和碳含量可以实现更高的亚铬酸盐还原度。在X射线衍射和扫描电子显微镜方法的支持下,金属产品的形成遵循以下顺序:Fe-C合金,(Fe,Cr)7C3和Fe-Cr-C合金。动力学分析表明,第一阶段是通过成核控制的,表观活化能为120kJ / mol,而铬的还原是通过结晶化学转化控制的,表观活化能为288kJ / mol。

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