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碱度对石钢烧结矿矿相结构及冶金性能的影响

刘丽娜

刘丽娜. 碱度对石钢烧结矿矿相结构及冶金性能的影响[J]. 钢铁钒钛, 2021, 42(3): 125-129. doi: 10.7513/j.issn.1004-7638.2021.03.019
引用本文: 刘丽娜. 碱度对石钢烧结矿矿相结构及冶金性能的影响[J]. 钢铁钒钛, 2021, 42(3): 125-129. doi: 10.7513/j.issn.1004-7638.2021.03.019
Liu Lina. Influence of basicity on mineralogical microstructure and metallurgical property of sinter in shijiazhuang iron & steel[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(3): 125-129. doi: 10.7513/j.issn.1004-7638.2021.03.019
Citation: Liu Lina. Influence of basicity on mineralogical microstructure and metallurgical property of sinter in shijiazhuang iron & steel[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(3): 125-129. doi: 10.7513/j.issn.1004-7638.2021.03.019

碱度对石钢烧结矿矿相结构及冶金性能的影响

doi: 10.7513/j.issn.1004-7638.2021.03.019
基金项目: 国家自然科学基金资助项目(U1360106,51574105)
详细信息
    作者简介:

    刘丽娜(1978—),女,河北博野人,副教授,博士生,主要从事工艺矿物学研究,E-mail:43116039@qq.com

  • 中图分类号: TF046

Influence of basicity on mineralogical microstructure and metallurgical property of sinter in shijiazhuang iron & steel

  • 摘要: 采用偏光显微镜研究了石钢不同碱度烧结矿的矿物组成及显微结构特征,烧结矿矿相结构与冶金性能之间的关系。研究发现:随着碱度的升高,烧结矿矿物组成简单化,粘结相含量升高,其中铁酸钙含量增加明显;显微结构均匀化,由斑状-粒状结构过渡为交织熔蚀结构,气孔率升高,出现骸晶状及菱形定向排列的赤铁矿,铁酸钙由他形晶形态过渡为针状形态。相应的烧结矿强度、还原性能及低温还原粉化性能有所改善。
  • 图  1  烧结矿冶金性能

    Figure  1.  Metallurgical property of sinter

    图  2  不同碱度烧结矿显微结构照片

    Figure  2.  Microstructure of sinters with different basicity

    表  1  原料化学成分

    Table  1.   Chemical compositions of raw materials %

    原料TFeFeOSiO2CaOMgOAl2O3SP烧损
    精矿164.2327.954.60.821.110.810.3060.0161.14
    精矿262.4225.24.770.94.280.480.3050.00125.2
    麦克矿61.741.23.050.020.141.740.0470.0556.2
    杨迪矿57.870.54.960.050.131.350.0270.03510.06
    澳矿62.30.455.010.254.41.920.0370.0683.02
    巴西矿65.850.52.370.020.140.980.020.0261.87
    白灰6.2271.91.5512.2
    高镁粉7.511.8580.97.05
    煤粉灰分35.55.710.4220.5
    下载: 导出CSV

    表  2  烧结矿配矿方案

    Table  2.   Mixture of sinter kg

    样号精矿1精矿2麦克矿杨迪矿澳矿巴西矿白灰高镁粉煤粉灰分返矿
    R1.84.621.001.016.562.025.022.650.321.255.55
    R2.14.510.980.996.401.974.903.140.321.255.56
    R2.44.400.950.976.241.924.783.640.311.255.56
    下载: 导出CSV

    表  3  烧结矿矿物组成及体积百分含量

    Table  3.   Mineral compositions and their volume fraction of sinter %

    样号金 属 相粘 结 相
    磁铁矿赤铁矿富氏体铁酸钙硅酸二钙钙镁橄榄石钙铁橄榄石玻璃质黄长石硅灰石
    R1.840~4525~301~210~1212~152~3少量3~5少量少量
    R2.425~3030~3525~3010~12少量1~2
    下载: 导出CSV

    表  4  烧结矿中主要矿物的抗压强度及还原度[7]

    Table  4.   Compressive strength and reducibility of main minerals in sinter

    矿物名称 瞬时抗压强度/(kg·mm−2) 还原度/%
    赤铁矿 26.7 49.9
    磁铁矿 36.9 26.7
    玻璃质 4.6 3.1
    铁酸一钙 37.0 40.1
    铁酸二钙 14.2 28.5
    下载: 导出CSV
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  • 刊出日期:  2021-06-10

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