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首页> 外文期刊>ISIJ international >'Continuous Cooling Transformation (CCT)' Concept for Iron Ore Sintering Using In Situ Quick X-ray Diffraction and Confocal Laser Microscope
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'Continuous Cooling Transformation (CCT)' Concept for Iron Ore Sintering Using In Situ Quick X-ray Diffraction and Confocal Laser Microscope

机译：使用原位快速X射线衍射和共焦激光显微镜进行铁矿石烧结的“连续冷却转变（CCT）”概念

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摘要

In this study, the formation of calcium ferrites during heating and cooling was investigated by in situ and real-time observation using a newly developed system, i.e., "quick X-ray diffraction (Q-XRD)," and an in situ laser microscope. In the new Q-XRD, a specimen was heated up to 1 773 K, and X-ray diffraction patterns were measured using a pixel-array area detector with an interval as short as a few seconds, In situ observation both of crystal structure and microstructure successfully revealed the effects of heating and cooling rates on the sintering reaction in the CaO-Fe_2O_3 system with special attention to overheating and overcooling phenomena. The first continuous cooling transformation (CCT) concept for iron ore sintering was proposed to understand overcooling phenomena when the molten oxide cooled down to room temperature and magnetite (Fe_3O_4), hematite (Fe_2O_3), and various types of calcium ferrite were formed. The CCT diagram for sintering provides crucial and fundamental information on the sintering accompanying solidification, precipitation, and formation of calcium ferrites from the molten oxide, and can be used as a guideline for controlling sintering processes.
机译：在这项研究中，通过使用新开发的系统（即“快速X射线衍射（Q-XRD）”和原位激光显微镜）进行原位和实时观察，研究了加热和冷却过程中铁酸钙的形成。 。在新的Q-XRD中，将样品加热到1 773 K，并使用间隔短至几秒钟的像素阵列面积检测器测量X射线衍射图，同时就地观察晶体结构和晶体结构。显微组织成功地揭示了加热和冷却速率对CaO-Fe_2O_3系统中烧结反应的影响，并特别注意了过热和过冷现象。提出了用于铁矿石烧结的第一个连续冷却转变（CCT）概念，以了解熔融氧化物冷却至室温并形成磁铁矿（Fe_3O_4），赤铁矿（Fe_2O_3）和各种类型的铁酸钙时的过冷现象。烧结的CCT图提供了与烧结相关的关键和基本信息，伴随着凝固，沉淀和由熔融氧化物形成铁酸钙，并可作为控制烧结过程的指南。

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  • 来源
    《ISIJ international》 |2013年第12期|2047-2055|共9页
  • 作者

    Masao KIMURA; Reiko MURAO;

  • 作者单位

    Formerly Advanced Technology Research Laboratories, Nippon Steel & Sumitomo Metal Corp. Now at Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki, 305-0801 Japan;

    Advanced Technology Research Laboratories, Nippon Steel & Sumitomo Metal Corp., 20-1 Shintomi, Futtsu, Chiba, 293-8511 Japan;

  • 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

    sinter; structure analysis; X-ray diffraction; calcium-ferrite; synchrotron radiation; in situ; continuous cooling transformation (CCT);

    机译：烧结结构分析;X射线衍射;铁酸钙同步辐射原位连续冷却转变（CCT）;

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