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首页> 外文期刊>ISIJ international >Comparison between Reducibilities of Columnar Silico-ferrite of Calcium and Aluminum (SFCA) Covered with Slag and Acicular SFCA with Fine Pores
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Comparison between Reducibilities of Columnar Silico-ferrite of Calcium and Aluminum (SFCA) Covered with Slag and Acicular SFCA with Fine Pores

机译：细孔覆盖的渣和针状SFCA覆盖的钙铝柱状硅铁氧体（SFCA）的还原性比较

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摘要

Reducibilities of silico-ferrite of calcium and aluminum (SFCA) have been examined using high temperature X-ray diffraction (XRD) analysis including the effect of hydrogen. Two types of sample were prepared: columnar SFCA covered with slag and acicular SFCA with fine pores, denoted by ‘Columnar SFCA’ and ‘Acicular SFCA’, respectively. These samples were synthesized using chemical reagents and iron ore powders. XRD analysis was applied to the samples heated in a condition simulating a blast furnace. Oxygen partial pressure was controlled by gas mixtures of CO–CO_(2)–He, and there were some cases where 3.9 vol% of hydrogen gas was added to the mixture. The microstructures of the samples before and after heating were observed by electron probe microanalysis (EPMA). XRD profiles indicated: (i) both SFCA samples were reduced to Fe via calcio-wüstite (CW), (ii) the reduction from ‘Acicular SFCA’ to CW took place at lower temperatures than that of ‘Columnar SFCA’ during the heating cycle up to 1000°C, and (iii) CW produced from ‘Acicular SFCA’ was reduced to Fe earlier than CW from ‘Columnar SFCA’ at 1000°C. These results suggest that SFCA and CW phases in ‘Acicular SFCA’ have higher reducibility than those in ‘Columnar SFCA’. This would be because ‘Acicular SFCA’ consists of smaller SFCA particles with fine pores. BSE images have revealed that such microstructures still remained even after the reduction to CW. Additions of hydrogen promoted reduction of ‘Columnar SFCA’ more effectively, and this effect was observed more remarkably in the reduction from CW to Fe than from SFCA to CW.
机译：钙和铝的硅铁氧体（SFCA）的还原性已使用包括氢效应在内的高温X射线衍射（XRD）分析进行了检查。制备了两种类型的样品：被渣覆盖的柱状SFCA和具有细孔的针状SFCA，分别以“柱状SFCA”和“针状SFCA”表示。这些样品是使用化学试剂和铁矿石粉末合成的。 XRD分析应用于在模拟高炉条件下加热的样品。氧气分压由CO–CO_（2）–He的气体混合物控制，在某些情况下会向混合物中添加3.9 vol％的氢气。通过电子探针显微分析（EPMA）观察样品在加热前后的微观结构。 XRD谱表明：（i）两种SFCA样品都通过钙钛矿（CW）还原为Fe（ii）从“针状SFCA”还原为CW的温度低于“柱状SFCA”。加热至1000°C的循环，以及（iii）在1000°C下，“针状SFCA”产生的CW较“柱状SFCA”产生的CW提前还原为Fe。这些结果表明，“针状SFCA”中的SFCA和CW相具有比“柱状SFCA”中更高的还原性。这是因为“针状SFCA”由具有细孔的较小SFCA颗粒组成。 BSE图像显示，即使还原为CW，这种微结构仍然保留。氢的添加更有效地促进了“柱状SFCA”的还原，与从SFCA到CW的还原相比，从连续波到铁的还原更明显地观察到了这种效果。

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