w（MgO）和w（Al2O3）对混合炉料软熔性能的影响

doi:DOI：10.13228/j.boyuan.issn0449-749x.20180275

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摘要改善高w（Al2O3）矿石冶炼的常用方法是增加烧结矿w（MgO），则高碱度烧结矿中w（MgO）和w（Al2O3）均升高且w（MgO）/w（Al2O3）改变。为降低冶炼成本，需合理调控高炉综合炉料的w（MgO）和w（Al2O3）。以现场烧结矿和天然块矿为试验原料，考察了烧结矿中w（MgO）和w（Al2O3）均增加的条件下混合炉料软熔性能的变化规律，结合相图和X射线衍射分析w（MgO）和w（Al2O3）的影响机制。结果表明，随着烧结矿中w（MgO）和w（Al2O3）增加，混合炉料软化特征温度降低；渣相熔化温度和黏度下降引起混合炉料的熔化特征温度降低，添加MgO能改善高Al2O3炉料的软熔性能，达到适宜的 w（MgO）/w（Al2O3）即可。

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关键词 ： w（MgO）, w（Al2O3）, 高碱度烧结矿, 混合炉料, 软熔性能

Abstract：The popular measure to improve the smelting of high w（Al2O3） ore in BF is adding w（MgO）into the sinter， and then both the w（MgO） and the w（Al2O3） in the sinter increase and the w（MgO）/w（Al2O3） ratio changes. To reach low smelting cost， it is of need to adjust w（MgO） and w（Al2O3） in burden reasonablely. Based on the actual production of sinters and the lump， the variation trends of softening-melting properties of mixed burdens under the conditions that both the w（MgO） and the w（Al2O3） were increased in the sinter. Combined with phase diagrams and X-ray diffractions， influencing mechanisms of the w（MgO） and the w（Al2O3） were analyzed. The results showed that， with the increasing of the w（MgO）and the w（Al2O3） in the sinter， the softening characteristic temperatures of mixed burdens tended to decrease； the reduction of the melting temperature and the viscosity of the slag phase caused the reduction of the melting characteristic temperatures of mixed burdens； adding w（MgO）to reach a proper w（MgO）/w（Al2O3） could improve the softening-melting properties of the high w（Al2O3） burden.

Key words： w（MgO） w（Al2O3） high basicity sinter mixed burden softening-melting property

收稿日期: 2018-07-05 出版日期: 2019-02-15

引用本文:

李廷乐，孙长余，汪琦. w（MgO）和w（Al2O3）对混合炉料软熔性能的影响[J]. 钢铁, 2019, 54(4): 12-18. LI Ting-le1，2， SUN Chang-yu1，2， WANG Qi1，2. Effects of w（MgO） and w（Al2O3） on softening-melting properties of mixed burden. Iron and Steel, 2019, 54(4): 12-18.

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