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首页> 外文期刊>ISIJ international >Direct Reduction Behaviors of Composite Binder Magnetite Pellets in Coal-based Grate-rotary Kiln Process
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Direct Reduction Behaviors of Composite Binder Magnetite Pellets in Coal-based Grate-rotary Kiln Process

机译：煤基炉排回转窑中复合粘结剂磁铁矿颗粒的直接还原行为

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摘要

Directly reduced iron is an imperative burden for EAF (electric arc furnace) to make good quality and special steel.As an alternative of direct reduction processes, an innovative coal-based direct reduction of composite binder magnetite pellets in grate-rotary kiln has been developed at Central South University and put into operation.A study of the direct reduction behaviors of composite binder magnetite pellets was carried out in a simulating coal-based grate-rotary kiln process in this paper.Preheated pellets made of magnetite concentrate and composite binder and fired oxide pellets containing bentonite as binder were directly reduced using non-coking coal as reductant in a tube furnace, and their reduction behaviors have been demonstrated by measuring reducibility, variations of compress strength, porosity, phases changes and micro structure under XRD, SEM and optical microscopy.It is shown that preheated pellets possess much better reducibility than fired oxide pellets.Superior reducibility of preheated pellets should be ascribed to their higher effective diffusivity due to higher porosity.The compressive strength of preheated pellets climbs quickly after reducing for 30 min and achieve a high value at the end of reduction, leading to smooth and intact metallized pellets whereas the compressive strength of metalized pellets from reducing of fired pellets is much lower, more cracks and fractures being formed.The preheated pellets possess self-curing function because of the multiple functions of composite binder, eliminate cracks and fractures and keep pellets intact during reducing, depressing reduction degradation and preventing accretion in rotary kiln.
机译：直接还原铁是电弧炉（EAF）生产优质钢和特殊钢的当务之急。作为直接还原工艺的替代方法，开发了一种新颖的基于煤的炉排回转窑复合粘结剂磁铁矿球团直接还原方法。本文在模拟煤基炉排回转窑的过程中，研究了复合粘结剂磁铁矿球团的直接还原性能。以非焦煤为还原剂，在管式炉中直接还原以膨润土为基料的氧化物球团，并通过在XRD，SEM和光学条件下测量还原性，压缩强度，孔隙率，相变和微观结构的变化来证明其还原行为。显微镜显示，预热的颗粒比烧成的氧化物颗粒具有更好的还原性。预热颗粒的孔隙率较高，应归因于其较高的有效扩散率。预热颗粒的抗压强度在还原30分钟后会迅速攀升，并在还原结束时达到较高的值，从而使金属化颗粒光滑而完整。烧结后的球团的还原导致金属化球团的抗压强度低得多，形成更多的裂纹和裂缝。预热的球团由于复合粘合剂的多种功能而具有自固化功能，消除了裂纹和裂缝并在还原，压制过程中保持球团的完整性减少回转窑的降解并防止其积聚。

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  • 来源
    《ISIJ international》 |2011年第2期|p.214-219|共6页
  • 作者

    Deqing ZHU; Vinicius MENDES; Tiejun CHUN; Jian PAN; Qihou LI; Jian; Guanzhou QIU;

  • 作者单位

    School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.;

    School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.,Vale, Rio de Janeiro 20030, Brazil.;

    School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.;

    School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.;

    School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.;

    Research Institute of Baosteel, Shanghai, 200050, China.;

    School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.;

  • 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

    magnetite concentrate direct reduction preheated pellets fired oxide pellets coal-based grate-rotary kiln;

    机译：磁铁矿精矿直接还原预热颗粒燃烧氧化物颗粒煤基g回转窑;

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