摘要
为探究不同铁水温度下脱磷熔渣结构演变对脱磷效果及磷迁移富集行为的影响,在铁水温度为1340~1420℃条件下进行了实验室试验,利用XRD、SEM-EDS、FTIR和Raman光谱对试验后脱磷终渣的结构进行了表征。热力学理论分析表明,随着温度的升高,磷的分配比逐渐降低。铁水脱磷试验表明,当铁水温度为1380℃时,铁水脱磷效率最高,温度过高或过低均不利于脱磷,且铁水硅质量分数随着温度的升高逐渐降低。XRD和SEM-EDS分析结果表明,磷主要富集在2CaO·SiO_(2)结晶区,富磷相由2CaO·SiO_(2)-3CaO·P_(2)O_(5)固溶体组成,温度的升高会降低富磷相的比例。拉曼和红外分析结果表明,Si—O—Si键受温度升高的影响较小。当温度较低时,炉渣中Q^(1)(Si)、Q^(2)(Si)和Q^(3)(Si)的含量增加。当温度升至1380℃时,Si—O—Si键断裂,Q^(0)(Si)增大。低聚合度的硅酸盐结构促进磷的迁移和聚集,以Q^(1)(P)形式存在的磷逐渐增加。当温度为1380~1420℃时,较高的铁水温度抑制了磷的迁移,进入渣中的硅往往以高聚合度的形式存在,随着脱硅反应的进行,渣的聚合度逐渐增加。此外,由于FeO_(6)八面体的显著增加和硅酸盐聚合度的提高,磷向硅氧网络结构中的迁移受到抑制,以Q^(0)(P)形式存在的磷逐渐增加,磷在炉渣中的扩散程度增加。可以为钢铁企业解决铁水磷质量分数超标问题和控制合理的预脱磷温度提供理论指导和参考。
In order to explore the influence of dephosphorization slag structure evolution on dephosphorization effect and phosphorus migration and enrichment behavior at different molten iron temperatures,laboratory experiments were carried out at molten iron temperatures of 1340℃to 1420℃.The effect of different conditions on the dephosphorization efficiency,and the structural characterization of the dephosphorization final slag after the experiment was carried out by using XRD,SEM-EDS,FTIR and Raman spectroscopy.Thermodynamic theoretical analysis shows that with the increase of temperature,the phosphorus distribution ration decreases gradually.The experiment of hot metal dephosphorization shows that when the temperature of hot metal is 1380℃,the dephosphorization efficiency of hot metal is the highest,too high or too low temperature is not conducive to dephosphorization,and the silicon content of hot metal decreases gradually with the increase of temperature.And with the increase of temperature,the silicon content of molten iron gradually decreases.The results of XRD and SEM-EDS analysis show that phosphorus is mainly enriched in the 2CaO·SiO_(2)crystallization region,and the phosphorus-rich phase is composed of 2CaO·SiO_(2)-3CaO·P_(2)O_(5)solid solution.The increase in temperature will reduce the proportion of phosphorus-rich phase.Raman and infrared analysis results show that the Si—O—Si bond is less affected by the temperature increase.When the temperature is low,the contents of Q^(1)(Si),Q^(2)(Si)and Q^(3)(Si)in slag increase.When the temperature rises to 1380℃,the Si—O—Si bond is broken and Q^(0)(Si)increases.The silicate structure with low polymerization degree promotes the migration and aggregation of phosphorus,and the phosphorus in the form of Q^(1)(P)gradually increases.When the temperature is between 1380℃and 1420℃,the higher molten iron temperature inhibits the migration of phosphorus,and the silicon entering the slag tends to exist in the form of high polymerization degree,and the polymerization degree of slag gradually increases with the desilication reaction.In addition,due to the remarkable increase of FeO_(6)octahedron and the improvement of silicate polymerization degree,the migration of phosphorus into the silicon-oxygen network structure was inhibited,and the phosphorus in the form of Q^(0)(P)gradually increased and the diffusion degree of phosphorus in slag increased.It can provide theoretical guidance and reference for iron and steel enterprises to solve the problem of excessive phosphorus content in molten iron and control a reasonable pre-dephosphorization temperature.
作者
周朝刚
陈庆功
闫占辉
赵长亮
刘道正
王连全
单庆林
王书桓
ZHOU Chaogang;CHEN Qinggong;YAN Zhanhui;ZHAO Changliang;LIU Daozheng;WANG Lianquan;SHAN Qinglin;WANG Shuhuan(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China;Steel Rolling Operation Department,Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063200,Hebei,China;Steelmaking Department,Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063200,Hebei,China;Qian'an Iron and Steel Company,Shougang Stock Company,Qian'an 064404,Hebei,China;Steelmaking Department,Tianjin Iron Works Company,Handan 056400,Hebei,China;Technical Center,Tangshan Iron and Steel Group Co.,Ltd.,Tangshan 063000,Hebei,China)
出处
《钢铁》
CAS
CSCD
北大核心
2024年第8期27-39,共13页
Iron and Steel
基金
河北省自然科学基金资助项目(H2022209089)
河北省高等学校基本科研业务费资助项目(JYG2022001)
钢铁冶金及资源利用省部共建教育部重点实验室开放基金资助项目(FMRUlab23-03)
河北省省属高等学校基本科研业务费研究资助项目(JQN2023008)
国家自然科学基金资助项目(50274128)。
关键词
预脱磷
铁水温度
氧化铁皮
红外光谱
拉曼光谱
熔渣结构
predephosphorization
hot metal temperature
iron oxide scale
infrared spectrum
Raman spectrum
slag structure
