Effects of MnO on slag viscosity and wetting behaviour between slag and refractory
Effects of MnO on slag viscosity and wetting behaviour between slag and refractory
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DOI：
10.1179/1743281215y.0000000048
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发表时间：
2016-01
影响因子：
2.1
通讯作者：
H. Zuo;C. Wang;Chuanshan Xu;J. Zhang;T. Zhang
中科院分区：
文献类型：
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作者：
H. Zuo;C. Wang;Chuanshan Xu;J. Zhang;T. Zhang
随着含锰铁矿石用量的增加，为降低钢铁成本和解决炉缸积灰问题，高炉渣型变化和炉缸耐火材料侵蚀现象日益严重。为了解决这些问题，迫切需要弄清MnO对炼铁生产的影响。本文首次测定了不同MnO含量炉渣的粘度，并利用红外光谱分析了MnO的影响机理。研究了不同MnO含量的炉渣与铝炭耐火材料的润湿行为。结果表明，随着MnO含量从0增加到2.0wt-%，熔体的熔融温度和粘度同时降低。红外光谱分析也证明Mn+、Ca 2+和Mg 2+的存在使Si-O键峰向高频移动，Si-O键的不对称性增加，导致粘度降低。此外，随着MnO含量从0增加到3 wt-%（碱度= 1.18），润湿反应的特征温度增加了约40°C。随着炉渣碱度从1.0增加到1.3（MnO = 1 wt-%），特征温度降低了近50°C。因此，炉渣中MnO含量的增加加速了炉缸炉衬的侵蚀速度，从而降低了高炉的寿命。
As more and more Mn bearing iron ores are used to decrease steel cost and deal with the problem of hearth deposition, slag regime change and hearth refractory erosion in blast furnace become more often. To address these problems, it is urgent to clarify the effects of MnO upon the ironmaking production. Herein, the viscosities of slags with different MnO contents were measured for the first time, and the influence mechanism of MnO was analysed by infrared spectrum. The wetting behaviours between slags with different MnO contents and alumina–carbon refractory were investigated. The results showed that meltability temperature and viscosity decrease simultaneously with the increasing MnO content from 0 to 2.0 wt-%. Infrared spectrum analysis also proved that the existence of Mn+, Ca2+ and Mg2+ makes the Si–O bonds peak moving towards high frequency and the asymmetry of Si–O bond increasing, leading to the decrease in viscosity decreasing. In addition, the characteristic temperatures for wetting reaction increased by ∼40°C with the increasing MnO content from 0 to 3 wt-% (basicity = 1.18). The characteristic temperatures decreased by nearly 50°C with the basicity of slag increasing from 1.0 to 1.3 (MnO = 1 wt-%). Therefore, the increasing MnO content in slag accelerates the erosion rate of BF hearth lining and then decreases the campaign life of blast furnace.