碱度对钒钛磁铁矿球团抗压强度和氧化硬化机理的影响研究

IF 1.9 3区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Song Zhang, Yanbing Zong, Yun Huang, Xiangyou Gui, Dian Lei, Jianliang Zhang, Xian Gan, Zhenyang Wang, Shushi Zhang, Peiyuan Lu
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引用次数: 0

摘要

目前,高炉冶炼钒钛磁铁矿(VTM)的典型炉料结构是加入酸性球团矿、高碱度烧结矿和块矿。为了提高进入高炉的球团比例,有必要将碱性负担转移到球团上。本研究探讨了碱性对 VTM 球团相变和氧化硬化机理的影响。结果表明,当预热温度为 950 ℃、预热时间为 15 分钟、焙烧温度为 1260 ℃、焙烧时间为 15 分钟时,随着碱度(CaO/SiO2)从 0.08 增加到 1.3,球团的抗压强度呈现出 "先增大后减小 "的趋势,碱度为 0.5 时最高值达到 3159 N pellet-1。随着碱度的增加,液相中的 CaO 除与 Fe2O3 生成硅酸盐与 SiO2 外,还可生成铁酸钙,使液相量增加。随着碱性的增加,氧化物结合的压痕逐渐减弱,而熔渣结合的压痕逐渐增强。适量的液相可以起到粘结和填充的作用,从而提高抗压强度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation of Basicity on Compressive Strength and Oxidation Induration Mechanism of Vanadium–Titanium Magnetite Pellets

Currently, the typical charge structure for blast furnace smelting of vanadium–titanium magnetite (VTM) is the addition of acidic pellets, high-basicity sinters, and lumps. To increase the percentage of pellets entering the blast furnace, it is necessary to transfer the basicity burden to the pellets. In this study, the effect of basicity on the phase transition and oxidation hardening mechanism of VTM pellets is investigated. In the results, it is indicated that when the preheating temperature is 950 °C, the preheating time is 15 min, the roasting temperature is 1260 °C, and the roasting time is 15 min, with the basicity (CaO/SiO2) increasing from 0.08 to 1.3, the compressive strength of pellets shows a trend of “increasing first and then decreasing,” with the highest value reaching 3159 N pellet−1 at basicity of 0.5. As the basicity increases, calcium ferrate can be generated by CaO in the liquid phase with Fe2O3 in addition to silicate with SiO2, which will increase the amount of the liquid phase. With the increase of basicity, the oxide-bonded induration is gradually weakened, and the slag-bonded induration is gradually enhanced. A moderate amount of liquid phase can play the role of bonding and filling, thereby improving compressive strength.

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来源期刊
steel research international
steel research international 工程技术-冶金工程
CiteScore
3.30
自引率
18.20%
发文量
319
审稿时长
1.9 months
期刊介绍: steel research international is a journal providing a forum for the publication of high-quality manuscripts in areas ranging from process metallurgy and metal forming to materials engineering as well as process control and testing. The emphasis is on steel and on materials involved in steelmaking and the processing of steel, such as refractories and slags. steel research international welcomes manuscripts describing basic scientific research as well as industrial research. The journal received a further increased, record-high Impact Factor of 1.522 (2018 Journal Impact Factor, Journal Citation Reports (Clarivate Analytics, 2019)). The journal was formerly well known as "Archiv für das Eisenhüttenwesen" and "steel research"; with effect from January 1, 2006, the former "Scandinavian Journal of Metallurgy" merged with Steel Research International. Hot Topics: -Steels for Automotive Applications -High-strength Steels -Sustainable steelmaking -Interstitially Alloyed Steels -Electromagnetic Processing of Metals -High Speed Forming
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