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首页> 外文期刊>ISIJ international >Reduction behavior of hematite to magnetite under fluidized bed conditions
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Reduction behavior of hematite to magnetite under fluidized bed conditions

机译：流化床条件下赤铁矿还原为磁铁矿的行为

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摘要

Reduction kinetic tests of Mt. Newman hematite ore from Western Australia were carried out in a laboratory-scale fluidized bed reactor at temperatures from 623 to 873 K and an absolute pressure of 10 bar. The reducing gas mixture was thermodynamically in equilibrium with magnetite and consisted of a mixture of H_2, H_2O, CO, CO_2 and CH_4. The effect of temperature and residence time was studied. The original ore and its mineralogical and petrographical changes with increasing reduction time were analyzed. A reflected-light microscope technique with CCD-camera was used to determine the progress and the mechanism of reduction. According to the mineralogy and texture the ore could be classified in four types (coarse hematite, mi-croplaty hematite, limonite and martite) with different reduction characteristics. Limonite and martite showed better reducibility than coarse and fine hematite. At all ore types the growth of dense magnetite rims was observed. The thickness of these layers was found to be linear proportional to reduction time. After analyzing the single steps of the reduction process the phase interface reaction turned out to be rate controlling between 673 and 773 K. Its activation energy is 91 kJ/mol.
机译：Mt的还原动力学试验。来自西澳大利亚州的纽曼赤铁矿矿石是在实验室规模的流化床反应器中于623至873 K的温度和10 bar的绝对压力下进行的。还原性气体混合物与磁铁矿在热力学上处于平衡状态，由H_2，H_2O，CO，CO_2和CH_4的混合物组成。研究了温度和停留时间的影响。分析了原始矿石及其随还原时间增加的矿物学和岩石学变化。用CCD相机的反射光显微镜技术确定了还原过程和还原机理。根据矿物学和质地，可将矿石分为具有不同还原特性的四种类型（粗赤铁矿，微型克拉普赤铁矿，褐铁矿和马氏体）。与褐铁矿和细赤铁矿相比，褐铁矿和martite的还原性更好。在所有矿石类型中，都观察到致密磁铁矿边缘的生长。发现这些层的厚度与还原时间成线性比例。在分析了还原过程的单个步骤之后，事实证明相界面反应的速率控制在673和773 K之间。其活化能为91 kJ / mol。

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