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Self-sintering of BOS Filter Cake for Improved Recyclability

机译：BOS滤饼的自烧结可提高可回收性

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摘要

The self-sintering of BOS filter cake has been investigated by studying its oxidation in air between 100 to 1 000℃. The aim of the study was to gain an understanding of the self-sintering of the BOS filter cake in stockpiles, in terms of what reactions occurred, and how strength was developed in the filter cake during self-sintering. Upon heating, the BOS filter cake underwent a sequence of drying, oxidation and calcination events. The self-sintering process was driven by the oxidation of very fine (200-300 nm) particles of metallic iron and wustite at low temperatures. Reactions in self-sintering were found to be the oxidation of metallic iron and wustite to hematite and zinc ferrite, beginning at approximately 120℃ and largely complete by 500-600℃. Phase analysis, thermodynamic modelling and enthalpy measurements were used to propose a probable reaction path consistent with the observed reaction products. These exothermic oxidation reactions at low temperatures provided the energy required to heat the stockpiles to drive self-sintering. Bonding within the reacted filter cake was from a network of particle-particle bonds formed between the very fine iron oxide particles in the matrix during oxidation at elevated temperatures. Exposure of the BOS filter cake to temperatures above 600℃ under oxidising conditions is likely sufficient to form adequately strong material for transport and recycling in the BOS. Fluxes played little role in the development of the bonding within the filter cake.
机译：通过研究BOS滤饼在100至1000℃之间的空气中的氧化作用，研究了BOS滤饼的自烧结。该研究的目的是从发生的反应以及自烧结过程中滤饼的强度如何发展方面，了解堆中BOS滤饼的自烧结。加热后，BOS滤饼经历了一系列干燥，氧化和煅烧过程。这种自烧结过程是由低温下非常细的（200-300 nm）金属铁和钙铁矿颗粒的氧化驱动的。发现自烧结的反应是金属铁和铁矿氧化为赤铁矿和铁酸锌，始于约120℃，并在500-600℃基本完成。相分析，热力学建模和焓测量被用于提出与观察到的反应产物一致的可能的反应路径。低温下的这些放热氧化反应提供了加热库存以驱动自烧结所需的能量。反应的滤饼内的结合来自在高温下氧化过程中在基质中非常细的氧化铁颗粒之间形成的颗粒-颗粒结合网络。 BOS滤饼在氧化条件下暴露于600℃以上的温度很可能足以形成足够坚固的材料，以便在BOS中运输和回收。助焊剂在滤饼内的粘合发展中起着很小的作用。

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  • 来源
    《ISIJ international》 |2019年第3期|432-441|共10页
  • 作者

    Raymond James LONGBOTTOM; Brian Joseph MONAGHAN; Guangqing ZHANG; David John PINSON; Sheng Jason CHEW;

  • 作者单位

    School of Mechanical, Materials, Mechatronic and Biomedical Engineering and ARC Research Hub for Australian Steel Manufacturing, University of Wollongong, Wollongong, NSW 2522 Australia;

    School of Mechanical, Materials, Mechatronic and Biomedical Engineering and ARC Research Hub for Australian Steel Manufacturing, University of Wollongong, Wollongong, NSW 2522 Australia;

    School of Mechanical, Materials, Mechatronic and Biomedical Engineering and ARC Research Hub for Australian Steel Manufacturing, University of Wollongong, Wollongong, NSW 2522 Australia;

    BlueScope Coke and Ironmaking Technology, Port Kembla, NSW 2505 Australia;

    BlueScope Coke and Ironmaking Technology, Port Kembla, NSW 2505 Australia;

  • 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

    BOS dust; recycling; by-products; self-sintering; characterisation;

    机译：BOS粉尘;回收;副产品;自烧结表征;

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