高爐爐缸凝鐵層物相分析

焦克新; 張建良; 劉征建; 劉彥祥; 梁利生; 賈國棟

doi:10.13374/j.issn2095-9389.2017.06.004

高爐爐缸凝鐵層物相分析

doi: 10.13374/j.issn2095-9389.2017.06.004

1) 北京科技大學冶金與生態工程學院, 北京 100083
2) 寶鋼股份煉鐵廠, 上海 200941
3) 滄州中鐵裝備制造材料有限公司, 滄州 061000

基金項目:

國家青年自然科學基金資助項目(51304014)

詳細信息

中圖分類號: TF533.2
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出版歷程
- 收稿日期: 2016-08-10

Analysis of the phase of the solid iron layer in blast furnace hearth

1) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2) Ironmaking Plant, Baoshan Iron and Steel Co., Ltd., Shanghai 200941, China
3) Cangzhou Zhongtie Manufacture, Equipment and Material Co., Ltd., Cangzhou 061000, China

摘要

摘要: 在高爐爐缸破損調研的基礎上對高爐爐缸耐火材料熱面凝鐵層進行取樣,利用掃描電子顯微鏡、物相分析等分析手段揭示了凝鐵層的物相組成,并運用Thermol-calc熱力學計算軟件結合TCFE8數據庫對鐵水中石墨碳的析出溫度及析出相分數進行了計算,最后揭示了爐缸凝鐵層物相的形成機理.結果表明,高爐爐缸凝鐵層主要由Fe相和石墨碳相交替分布組成,鐵水成分對石墨碳析出溫度影響較大,石墨碳析出溫度遠高于鐵水凝固溫度,鐵水中C、Si元素含量對石墨碳析出相分數影響較大,而石墨碳析出相可增大鐵水黏度11.9%.凝鐵層中石墨碳的析出主要是由于Fe-耐火材料界面溫度低于石墨碳析出溫度,使得鐵水中C不斷向耐火材料熱面遷移,進而形成Fe-C交替的分層結構.
- 高爐 /
- 爐缸 /
- 凝鐵層 /
- 石墨碳 /
- 析出相
Abstract: The solidified iron layer in blast furnace (BF) hearth was estimated based on the blast furnace damage. The phase compositions of the solidified iron layer were studied using scanning electron microscope and energy dispersive spectrometer. The temperature and proportions of graphite precipitation were calculated by using the Thermol-calc software and the TCFE8 database. Finally, the formation of the solidified iron layer was examined. The results suggest that the solidified iron comprises iron and graphite. The temperature of the graphite precipitation is affected by the composition of the hot metal, and it is much higher than the solidification temperature of the hot metal. The proportions of precipitated graphite are affected by the C and Si in the hot metal, whereas the precipitated graphite increases the viscosity of the hot metal by 11.9%. The graphite precipitates at the interface with the Fe-refractory at lower temperature than that of the graphite saturation, which allows the C migration from the hot metal to the refractory interface.
- blast furnace /
- hearth /
- iron solidified layer /
- graphite /
- phase precipitation

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