Na_(2)O-TiO_(2)-SiO_(2)-CaO-Al_(2)O_(3)-V2O5-MnO-MgO-FeO渣系渣铁间硫分配比热力学模型  

Thermodynamic model for calculating sulfur distribution ratio between Na_(2)O-TiO_(2)-SiO_(2)-CaO-Al_(2)O_(3)-V2O5-MnO-MgO-FeO slags and hot metal

作　　者：尹学杰 陈德胜[1] 王丽娜[1] 赵宏欣[1] 甄玉兰 齐涛[1] 王猛 Xuejie YIN;Desheng CHEN;Lina WANG;Hongxin ZHAO;Yulan ZHEN;Tao QI;Meng WANG(National Engineering Research Center of Green Recycling for Strategic Metal Resources,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;School of Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Hebei Zhongke Tongchuang Vanadium&Titanium Technology Co.,Ltd.,Hengshui,Hebei 053000,China)

机构地区：[1]中国科学院过程工程研究所战略金属资源绿色循环利用国家工程研究中心,北京100190 [2]中国科学院大学化工学院,北京100049 [3]河北中科同创钒钛科技有限公司,河北衡水053000

出　　处：《过程工程学报》2023年第1期124-135,共12页The Chinese Journal of Process Engineering

基　　金：中国科学院战略性先导科技专项(C类)(编号:XDC04010100);国家重点研发计划项目(编号:2018YFC1900500);国家自然科学基金青年基金项目(编号21908231);河北省重大科技成果转化专项(编号:19044012Z);河北省重点研发计划项目(编号:20374105D)。

摘　　要：基于离子分子共存理论(IMCT)建立了Na_(2)O-TiO_(2)-SiO_(2)-CaO-Al_(2)O_(3)-V2O5-MnO-MgO-FeO九元渣系的结构单元作用浓度模型和渣铁间硫分配比热力学模型,并对模型进行实验验证。通过模型计算出1200℃下渣系主要结构单元组成和渣中Na_(2)O,CaO,MnO,MgO和FeO的活度,发现Na_(2)O的加入可促进渣中低熔点物质的生成,降低渣系熔化性温度,改善脱硫反应的动力学条件;同时随着Na_(2)O加入量的增加,渣中Na_(2)O和CaO的活度增加,进而降低渣中S2?离子活度,强化渣铁间脱硫反应。实验结果表明,增加碱矿比提高了渣铁间硫分配比,有利于铁水深度脱硫,铁水中硫含量可降至0.0005wt%以下,硫分配比的理论计算值与实验结果吻合极好。渣中各碱性氧化物的硫分配比随碱矿比RN/C增加逐渐增大,各碱性氧化物硫分配比大小为Na_(2)O>CaO>MnO>FeO>MgO。本研究将共存理论模型成功应用到九元复杂渣系渣铁间脱硫反应机理研究,为铁水深度脱硫过程的渣系优化提供了理论依据。A model for the action concentrations calculation of structural units in Na_(2)O-TiO2-SiO2-CaO-Al_(2)O_(3)-V2O5-MnO-MgO-FeO slags and a thermodynamic model of the sulfur distribution ratio between slag and hot metal have been developed based on the ion-molecule coexistence theory(IMCT),and the model was verified by sodium oxide smelting experiments.The theoretical calculation results showed the composition of the main structural units and the activities of Na_(2)O,CaO,MnO,MgO,and FeO in slag at 1200℃.The formation of compounds with a low melting point can be promoted by the addition of Na_(2)O,meanwhile,the content of substances with high melting points decreases,which led to a decrease in the melting temperature of slag and the improvement of dynamic conditions of desulfurization reaction.Besides,the activities of Na_(2)O and CaO increased with the increase of Na_(2)O,thereby the activity of S2?decreased,and the desulfurization reaction between slag and hot metal can also be enhanced.The experimental results revealed that the sulfur distribution ratio between slag and hot metal improved by the increase in RN/C,which was beneficial to the deep desulfurization process of hot metal,and the sulfur can be removed to less than 0.0005wt%.The theoretical calculation results of the sulfur distribution ratio were in good agreement with the experimental results,which indicated that the sulfur distribution ratio can be well predicted by the model during the sodium oxide smelting process.The sulfur distribution ratios of basic oxide in the slag increased with the RN/Cincreasing and were ranked as Na_(2)O>CaO>MnO>FeO>MgO.The IMCT was successfully applied to the investigation of the mechanism for the desulfurization reaction process between slag and hot metal in the Na_(2)O-Ti O2-SiO2-CaO-Al_(2)O_(3)-V2O5-MnO-MgO-FeO slags,which provided a theoretical basis for the optimization of slags in the deep desulfurization process of hot metal.

关 键 词：熔渣结构 共存理论 硫分配比 活度 热力学模型 钠化熔炼 

分 类 号：TF534.2[冶金工程—钢铁冶金]