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铁水预脱磷温度对脱磷渣结构及行为的分析与探讨

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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1 340~1 420℃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1 380℃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·SiO2结晶区,富磷相由2CaO·SiO2-3CaO·P2O5 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Q1(Si)、Q2(Si)和Q3(Si)的含量增加.当温度升至1 380℃时,Si—O—Si键断裂,Q0(Si)增大.低聚合度的硅酸盐结构促进磷的迁移和聚集,以Q1(P)形式存在的磷逐渐增加.当温度为1 380~1 420℃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FeO6八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Q0(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.
Analysis and discussion of molten iron pre-dephosphorization temperature on structure and behavior of dephosphorization slag
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 1 340℃to 1 420℃.The effect of different conditions on the dephos-phorization 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 1 380℃,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 phospho-rus is mainly enriched in the 2CaO·SiO2 crystallization region,and the phosphorus-rich phase is composed of 2CaO·SiO2-3CaO·P2O5 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 Q1(Si),Q2(Si)and Q3(Si)in slag increase.When the tem-perature rises to 1 380℃,the Si—O—Si bond is broken and Q0(Si)increases.The silicate structure with low polymerization degree promotes the migration and aggregation of phosphorus,and the phosphorus in the form of Q1(P)gradually increases.When the temperature is between 1 380℃and 1 420℃,the higher molten iron tempera-ture inhibits the migration of phosphorus,and the silicon entering the slag tends to exist in the form of high polymer-ization degree,and the polymerization degree of slag gradually increases with the desilication reaction.In addition,due to the remarkable increase of FeO6 octahedron and the improvement of silicate polymerization degree,the migra-tion of phosphorus into the silicon-oxygen network structure was inhibited,and the phosphorus in the form of Q0(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 con-trol a reasonable pre-dephosphorization temperature.

predephosphorizationhot metal temperatureiron oxide scaleinfrared spectrumRaman spectrumslag structure

周朝刚、陈庆功、闫占辉、赵长亮、刘道正、王连全、单庆林、王书桓

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华北理工大学冶金与能源学院,河北 唐山 063210

首钢京唐钢铁联合有限责任公司轧钢作业部,河北 唐山 063200

首钢京唐钢铁联合有限责任公司炼钢部,河北 唐山 063200

首钢股份公司迁安钢铁公司,河北 迁安 064404

天津铁厂有限公司炼钢厂,河北 邯郸 056400

唐山钢铁集团有限责任公司技术中心,河北 唐山 063000

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预脱磷 铁水温度 氧化铁皮 红外光谱 拉曼光谱 熔渣结构

河北省自然科学基金资助项目河北省高等学校基本科研业务费资助项目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河北省省属高等学校基本科研业务费研究资助项目国家自然科学基金资助项目

H2022209089JYG2022001FMRUlab23-03JQN202300850274128

2024

钢铁
中国金属学会钢铁研究总院

钢铁

CSTPCD北大核心
影响因子:1.204
ISSN:0449-749X
年,卷(期):2024.59(8)