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首页> 外文期刊>ISIJ international >Induration Process of Pellets Prepared from Mixed Magnetite–35% Hematite Concentrates
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Induration Process of Pellets Prepared from Mixed Magnetite–35% Hematite Concentrates

机译：混合磁铁矿– 35％赤铁矿精矿制粒的硬化过程

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To explore the possibility of successfully processing iron ore pellets with a high content of hematite, thermogravimetric tests were performed to study the induration process of pellets composed of a mixture of iron ore concentrates (magnetite and 35% wt of hematite). Thermogravimetric tests were performed nonisothermally from 25°C to 1400°C using two heating rates, 5 and 50°C/min. To identify the reactions involved and to follow the microstructural evolution throughout the induration process, selected tests were arrested at predetermined temperatures, and samples were rapidly cooled to room temperature for later characterization using X-ray diffraction (XRD) and scanning electron microscopy (SEM) along with energy dispersive spectroscopy (EDS). It was found that the formation of phases such as calcium ferrite (CF), magnesium ferrite (MF), silico-ferrites of calcium (SCF) and silico-ferrites of calcium and aluminum (SCFA) are influenced by the heating rate. The microstructure of the fired pellet processed at 50°C/min showed compact small grains of the sintered phase of the secondary hematite (SH), partially surrounded by a slag phase. In contrast, the fired pellet processed at 5°C/min exhibited a microstructure consisting of the SH phase with a faceted morphology surrounded by a relatively large amount of the slag phase. The results suggest that the pellet processed at 50°C/min had a more satisfactory response to the induration process.
机译：为了探索成功处理高赤铁矿含量的铁矿石球团的可能性，进行了热重测试，以研究由铁矿精矿（磁铁矿和35％wt的赤铁矿）混合物组成的球团的硬结过程。使用5和50°C / min的两种加热速率在25°C至1400°C的温度下进行非等温热重测试。为了确定涉及的反应并跟踪整个硬结过程中的微观结构演变，将选定的测试在预定温度下进行，然后将样品迅速冷却至室温，以便稍后使用X射线衍射（XRD）和扫描电子显微镜（SEM）进行表征以及能量色散光谱（EDS）。已经发现，诸如铁酸钙（CF），铁酸镁（MF），钙的硅铁素体（SCF）以及钙和铝的硅铁素体（SCFA）的相的形成受加热速率的影响。以50°C / min的速度处理的烧结颗粒的微观结构显示出次生赤铁矿（SH）烧结相的致密小晶粒，部分被炉渣相包围。相反，以5℃/ min的速度处理的烧结颗粒显示出由SH相组成的微结构，所述SH相具有被相对大量的炉渣相包围的多面形态。结果表明，以50℃/ min处理的颗粒对硬结过程具有更令人满意的响应。

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