典型炼钢含氟渣系挥发行为分析

炼钢 ›› 2020, Vol. 36 ›› Issue (5): 75-78.

典型炼钢含氟渣系挥发行为分析

赵忠宇，赵俊学，王泽，谭泽馨，屈波樵，崔雅茹

（西安建筑科技大学冶金工程学院，陕西西安 710055）

出版日期:2020-10-05 发布日期:2020-10-13

Volatilization behavior of typical steelmaking fluorine-containing slag system

Online:2020-10-05 Published:2020-10-13

摘要/Abstract

摘要：

以电渣重熔用含氟渣、连铸含氟保护渣，以及传统CaF₂-CaO精炼渣作为典型炼钢渣系，通过热重（TG）和质谱（MS）检测对各渣系挥发行为做出分析。结果表明：电渣重熔用含氟渣在1300℃以上剧烈挥发，挥发分主要为CaF₂、MgF₂以及少量SiF₄、AlF₃。连铸含氟保护渣挥发过程分为两个阶段，第一阶段（750~1200℃）主要为CaF₂与Na₂O、SiO₂反应生成NaF和SiF₄气体，同时伴随少量Na₂O的蒸发；第二阶段（大于1300℃）挥发过程为CaF₂的蒸发。对于CaF₂-CaO基精炼渣，在共晶点（84%CaF₂-16%CaO）处，CaF₂的蒸发现象最为剧烈。该项研究对炼钢过程炉渣成分、性能控制以及冶金环保具有指导意义。

关键词: font-size:9pt, ">炼钢, 含氟渣, 挥发, 热分析

Abstract:

Remelting electroslag，continuous casting mold flux and secondary refining slag were taken as typical steelmaking slag systems. And the volatilization behaviors of each slag system were analyzed by thermogravimetric (TG) and mass spectrometry (MS). The results showed that the remelting electroslag volatilized violently above 1300℃，and the volatiles were mainly CaF₂，MgF₂ with a small amount of SiF₄ and AlF₃. The continuous casting mold flux volatilization was divided into two stages，in the first stage (750—1200℃) CaF₂ reacts with Na₂O and SiO₂ to form NaF and SiF₄, accompanied by the evaporation of a small amount of Na₂O. The second stage (>1300℃) was mainly the CaF₂ evaporation. For CaF₂-CaO based refining slag，the evaporation of CaF₂ was the most intense at the eutectic point (84%CaF₂-16%CaO). This research has guiding significance for the composition and performance control of fluorine-containing slag and metallurgical environmental protection in the steelmaking process.

Key words: Times New Roman", ,", serif", font-size:10.5pt, ">steelmakingfont-size:10.5pt, ">, Times New Roman", ,", serif", font-size:10.5pt, ">fluorine-containing slagfont-size:10.5pt, ">, Times New Roman", ,", serif", font-size:10.5pt, ">volatilizationfont-size:10.5pt, ">, Times New Roman", ,", serif", font-size:10.5pt, ">thermal analysis

赵忠宇, 赵俊学, 王泽, 谭泽馨, 屈波樵, 崔雅茹. 典型炼钢含氟渣系挥发行为分析[J]. 炼钢, 2020, 36(5): 75-78.

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