杨聪聪(通讯作者), 夏光辉, 朱德庆, 潘建, 郭正启, 李思唯. 铁矿氧化球团低温还原粉化性能的影响因素评述[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2024.01.04.002
引用本文: 杨聪聪(通讯作者), 夏光辉, 朱德庆, 潘建, 郭正启, 李思唯. 铁矿氧化球团低温还原粉化性能的影响因素评述[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2024.01.04.002
Review on the influencing factors of reduction disintegration performance of iron ore oxidized pellets[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2024.01.04.002
Citation: Review on the influencing factors of reduction disintegration performance of iron ore oxidized pellets[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2024.01.04.002

铁矿氧化球团低温还原粉化性能的影响因素评述

Review on the influencing factors of reduction disintegration performance of iron ore oxidized pellets

  • 摘要: 在高炉和气基竖炉工艺中,为使炉况良好,应保证上升还原气能快速且均匀地穿过料柱,而含铁炉料的低温还原粉化和还原膨胀是恶化料柱透气性的两大主要原因。本文主要综述了影响铁矿氧化球团低温还原粉化性能的因素,并在此基础上讨论了改善球团矿低温还原粉化性能的主要措施。影响球团矿低温还原粉化性能的主要因素包括:球团矿的化学成分(碱度、SiO2、MgO、Al2O3含量等)、物相组成和微观结构等。在实际生产中,可以通过优化球团矿成分(适当提高碱度或MgO含量等)和物相组成(发展液相固结)、调控球团矿孔隙结构(喷洒或涂层降低球团孔隙率)和提高球团矿机械强度来降低还原速率,减少还原过程产生的内应力,从而改善球团矿的低温还原粉化性能。

     

    Abstract: In blast furnace and gas-based shaft furnace processes, to guarantee good furnace conditions, it is necessary to ensure that the rising reducing gas can quickly and evenly pass through the burden. The low-temperature reduction disintegration and reduction swelling of iron ore pellets are the two main reasons for deteriorating the permeability of the burden. This paper mainly reviews the factors affecting the low-temperature reduction disintegration performance of iron ore oxidized pellets and discusses the main measures to improve the low-temperature reduction disintegration performance of pellets on this basis. The main factors affecting the low-temperature reduction disintegration performance of pellets include the chemical composition of pellets (basicity, SiO2, MgO, Al2O3 content, etc.), phase composition and microstructure, etc. In actual production, the low-temperature reduction disintegration performance of pellets can be improved by optimizing the composition (appropriately increasing the basicity or MgO content, etc.) and phase composition (developing liquid phase consolidation) of pellets, regulating the pore structure of pellets (spraying or coating to reduce the porosity of pellets) and improving the mechanical strength of pellets, thereby reducing the reduction rate, reducing the internal stress generated during the reduction process, and improving the low-temperature reduction disintegration performance of pellets.

     

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