铝镇静钢钢液对MgO质耐火材料侵蚀的研究
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- 英文论文题名：Erosion of the Molten Al-killed Steel on MgO-based Refractory Materials
- 论文作者：盛力 ; 张立峰 ; 李亚琼 ; 侯新梅
- 英文论文作者：Li Sheng ; Lifeng Zhang ; Yaqiong Li ; Xinmei Hou ; School of Metallurgical and Ecological Engineering ; University of Science and Technology Beijing
- 年：2016
- 作者机构：北京科技大学冶金与生态工程学院;
- 论文关键词：中间包内衬耐火材料 ; 铝镇静钢 ; 压力 ; 孔隙度 ; 侵蚀 ; 镁铝尖晶石
- 英文论文关键词：Tundish lining refractory ; Al-killed steel ; Pressure ; Porosity ; Erosion ; MgO·Al_2O_3 spinel
- 会议召开时间：2016-05-19
- 会议录名称：第十九届（2016年）全国炼钢学术会议大会报告及论文摘要集
- 语种：中文
- 分类号：TF76
- 学会代码：ZGJS
- 会议名称：第十九届（2016年）全国炼钢学术会议
- 会议地点：中国湖南长沙
- 主办单位：中国金属学会炼钢分会
- 学会名称：中国金属学会
- 页数：1
- 文件大小：86k
- 原文格式：O
- 会议级别：全国
摘要
作为直接与钢液接触的中间包工作层,中间包内衬镁质耐火材料会被铝镇静钢侵蚀,生成镁铝尖晶石夹杂物。这不仅会影响耐火材料的使用寿命,也会污染钢液,降低钢水洁净度。本文选用中间包内衬镁质耐火材料压制的耐材棒为研究对象,考察压力对其密度、孔隙率的影响:同时采用感应炉熔炼铝镇静钢并将耐材棒插入熔体中,考察不同压力、侵蚀时间下钢液对耐材棒的侵蚀影响规律。结合自动扫描电镜(ASPEX)的研究,其结果表明,铝镇静钢会对镁质耐材棒造成侵蚀,生成厚度不均的镁铝尖晶石层。随着压制压力从1 MPa增加到4 MPa,耐材棒密度提高、孔隙度降低,导致耐材棒致密进而降低了钢液-耐材反应通道,界面处镁铝尖晶石层厚度降低:随着侵蚀时间从30min延长到90min,镁铝尖晶石层厚度增加,侵蚀严重。
As a tundish working layer contact with steel directly,the tundish lining MgO-based refractory can be eroded by Al-killed steel with the formation of MgO·Al_2O_3.It will not only affect the service life of refractory,but also pollute molten steel and reduce the cleanliness of steel.In this article,the refractory rod prepared by pressing tundish lining MgO-based refractory powders was used as raw materials.Under various pressure conditions,the structure of the refractory rod was exanimated firstly by its density and porosity.And the effect of pressure and erosion time on the refractory/steel reaction was investigated by inserting the refractory rod into the Al-killed molten steel using an induction furnace.With the help of SEM(ASPEX),the results indicated that a MgO·Al_2O_3spinel layer of non-uniform thickness was formed due to the Al-killed steel erosion.With the increase of pressure from 1 MPa to 4MPa,the density of the refractory material rod increased,but the porosity decreased.which lead to a compact structure of the refractory rod,and reduced the reaction channel of refractory/steel reaction.The thickness of the MgO·Al_2O_3 spinel layer therefore become decreased.As the erosion time extension from 30 min to 90 min,the MgO-Al_2O_3 spinel layer thickness increased.
As a tundish working layer contact with steel directly,the tundish lining MgO-based refractory can be eroded by Al-killed steel with the formation of MgO·Al_2O_3.It will not only affect the service life of refractory,but also pollute molten steel and reduce the cleanliness of steel.In this article,the refractory rod prepared by pressing tundish lining MgO-based refractory powders was used as raw materials.Under various pressure conditions,the structure of the refractory rod was exanimated firstly by its density and porosity.And the effect of pressure and erosion time on the refractory/steel reaction was investigated by inserting the refractory rod into the Al-killed molten steel using an induction furnace.With the help of SEM(ASPEX),the results indicated that a MgO·Al_2O_3spinel layer of non-uniform thickness was formed due to the Al-killed steel erosion.With the increase of pressure from 1 MPa to 4MPa,the density of the refractory material rod increased,but the porosity decreased.which lead to a compact structure of the refractory rod,and reduced the reaction channel of refractory/steel reaction.The thickness of the MgO·Al_2O_3 spinel layer therefore become decreased.As the erosion time extension from 30 min to 90 min,the MgO-Al_2O_3 spinel layer thickness increased.
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