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首页> 外文期刊>ISIJ international >DRI from Recycled Iron Bearing Wastes for Lower Carbon in the Blast Furnace
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DRI from Recycled Iron Bearing Wastes for Lower Carbon in the Blast Furnace

机译：高炉中含铁量较低的可回收含铁废物中的直接还原铁

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摘要

Reduction of Fe-bearing FINEX process waste and carbon composite pellets from 1 373 K to 1 573 K to produce DRI (direct reduced iron) for use in the blast furnace was investigated using a modified thermo-gravimetric analyzer. Reduction from the initial Fe_2O_3 was not uniform throughout the composite pellet. Oxygen removal from the Fe_2O_3 rich composite pellets over 84% was only observed at 1 573 K. Lower temperatures resulted in significantly un-reduced FeO_t due to the premature consumption of the carbon. A peripheral boundary of FeO_t·Al_2O_3 and 2FeO·SiO_2 phases surrounding the reducible FeO_t was observed in some of the partially reduced cross-sectional SEM (scanning electron microscope) images that could hinder reduction. From the apparent activation energy, interfacial reaction seems to affect the kinetics of the Fe-bearing process waste composite pellets. Bursting of pre-dried composite pellets containing less than 2 mass% moisture was simulated in a RHF hearth simulator. From direct observation of pellets charged between 1 173 K to 1 573 K, medium-sized pellets between 9.4 to 12.4 mm diameter showed less bursting of the pellet, when charged below 1 273 K. In addition, modification of the physical strength of the hard bedrock formed from pellet bursting could be softened with additions of SiO_2.
机译：使用改进的热重分析仪，研究了将含Fe的FINEX工艺废料和碳复合颗粒从1 373 K减少到1 573 K以生产用于高炉的DRI（直接还原铁）的方法。在整个复合颗粒中，从初始Fe_2O_3的还原不均匀。仅在1 573 K时才观察到从富含Fe_2O_3的复合材料球团中去除氧气的比例超过84％。较低的温度会导致碳的过早消耗，从而导致FeO_t显着降低。在部分会减小截面的SEM（扫描电子显微镜）图像中观察到FeO_t·Al_2O_3和2FeO·SiO_2相围绕可还原FeO_t的外围边界。从表观活化能来看，界面反应似乎会影响含铁工艺废料复合颗粒的动力学。在RHF炉膛模拟器中模拟了水分含量低于2质量％的预干燥复合颗粒的破裂。从直接观察带电的1 173 K到1 573 K之间的球团来看，当直径小于9.4到12.4 mm的中型球团，当装入低于1 273 K时，球团的爆裂更少。球团爆裂形成的基岩可以通过添加SiO_2来软化。

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  • 来源
    《ISIJ international》 |2015年第6期|1157-1164|共8页
  • 作者

    Sung Hoon CHUNG; Ki Hyun KIM; Il SOHN;

  • 作者单位

    Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749 Korea;

    Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749 Korea;

    Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749 Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fe-bearing process waste; RHF; blast furnace DRI; bursting; lower carbon in BF;

    机译：含铁工艺废料;RHF;高炉DRI;爆裂高炉中的低碳;

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