磷在多相脱磷转炉渣中的分布

doi:10.13228/j.boyuan.issn0449-749x.20190107

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摘要为了研究碱度、TFe含量对炉渣物相以及磷在不同物相中分布的影响,对3种不同成分脱磷转炉渣的微观结构进行形貌和成分分析对比。当炉渣中FeO含量较高、碱度中等时,炉渣在冶炼过程高温状态下处于液态,在取样空冷条件下析出FeO含量高的枝状晶体结构和CaO-SiO₂-(FeO)基体相,基体相中P₂O₅质量分数约为6.5%。当炉渣中FeO含量较低、碱度较低时,炉渣在冶炼过程高温状态下处于液态,在取样空冷条件下析出相和炉渣总成分相差不大。当炉渣的碱度中等、TFe含量控制合适的情况下,炉渣在冶炼过程高温状态下处于固液共存区域,形成液相和2CaO·SiO₂-3CaO·P₂O₅固溶体,固溶体中P₂O₅质量分数为30%～40%。当炉渣处于C₂S和液相渣的共存区域时,2CaO·SiO₂-3CaO·P₂O₅固溶体的析出使得炉渣液相中P₂O₅活度降低,使得铁水中磷向液相渣中传递,脱磷反应程度更高,脱磷效果较好。

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	董文亮
	潘宏伟
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	李海波
	田志红

关键词 ：脱磷转炉渣, 富磷相, 多相渣, 磷分配比

Abstract：The morphology and composition of three different dephosphorization converter slags were compared and the effect of basicity and TFe on the phosphorous distribution in slag different phases was discussed. For the slag with a high FeO content and low basicity, the slag existed as a liquid state in the oxygen blowing process, then the high FeO structure of which the P₂O₅ mass percent was about 6.5% and the CaO-SiO₂-(FeO) phase were formed under the air cooling condition. For the slag with a medium FeO content and low basicity, the slag existed as a liquid state during the high temperature and the precipitation phases were not much different under the sampling air cooling condition. When the basicity of the slag is moderate and the TFe content is suitable, the slag is in a solid-liquid coexisting zone at the high temperature, 2CaO·SiO₂-3CaO·P₂O₅ solid solution was formed and the mass percent of P₂O₅ in the solid solution was as high as 30%-40%. In the process of dephosphorization, the proportion of 2CaO·SiO₂ in the dephosphorization slag should be increased, and 2CaO·SiO₂-3CaO·P₂O₅ was formed to reduce the activity of P₂O₅ in the liquid phase slag, which made a contribution to the dephosphorization efficiency.

Key words： dephosphorization slag phosphorous condensed phase multi phase flux phosphorous distribution

收稿日期: 2019-03-19

引用本文:

董文亮, 潘宏伟, 罗磊, 季晨曦, 李海波, 田志红. 磷在多相脱磷转炉渣中的分布[J]. 钢铁, 2020, 55(2): 75-81. DONG Wen-liang, PAN Hong-wei, LUO Lei, JI Chen-xi, LI Hai-bo, TIAN Zhi-hong. Phosphorous distribution in dephosphorization slag. Iron and Steel, 2020, 55(2): 75-81.

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