基于IMCT理论的CaO-SiO_2-MgO-Al_2O_3-Na_2O渣系的脱硫热力学模型
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摘要
为了精确表征含Na_2O渣系的脱硫能力,改善脱硫效果,基于熔渣离子与分子共存理论(IMCT)建立了CaO-SiO_2-MgO-Al_2O_3-Na_2O渣系结构单元的作用浓度计算模型和1 753 K时该渣系的脱硫热力学模型。并对渣系的总硫分配比及各自硫分配比的影响因素进行了讨论分析。理论结果表明,除LS,MgS外,随着Al_2O_3质量分数的增加,该渣系的脱硫能力明显下降,而MgO和Na_2O质量分数的增加,对提高渣系的脱硫能力具有明显的促进作用。此外,少量的Na_2O即可表现出很强的脱硫效果,这为含有Na_2O的冶金二次资源在铁水脱硫过程中的应用以及铁水脱硫渣系的优化提供了必要的理论依据。
In order to accurately characterize the desulfurization capacity of the Na_2O-containing slag system and improve the desulfurization effect,the thermodynamic model for the mass action concentrations calculation for the CaOSiO2-MgO-Al_2O_3-Na_2O slag system and the thermodynamic model of the desulfurization for the slag at 1 753 K were established,based on the ion and molecule coexistence theory(IMCT). Then the influence factors of total sulfur distribution ratio and the respective sulfur distribution ratio of the slag were discussed and analyzed. The theoretical results showed that,aparting from the LS,Mg S,with the increasing of the mass percent of Al_2O_3,the desulfurization capacity of the slag significantly decreased. While the increasing of the mass percent of Mg O and Na_2O can significantly promote the desulfurization capability of the slag. In addition,a small amount of the mass percent of Na_2O showed a strong effect on the desulphurization capability,which provided a theoretical basis for the application of the Na_2O-containing secondary metallurgical resources and the optimization of the desulfurization slag system in the desulphurization process for the hot metal.
In order to accurately characterize the desulfurization capacity of the Na_2O-containing slag system and improve the desulfurization effect,the thermodynamic model for the mass action concentrations calculation for the CaOSiO2-MgO-Al_2O_3-Na_2O slag system and the thermodynamic model of the desulfurization for the slag at 1 753 K were established,based on the ion and molecule coexistence theory(IMCT). Then the influence factors of total sulfur distribution ratio and the respective sulfur distribution ratio of the slag were discussed and analyzed. The theoretical results showed that,aparting from the LS,Mg S,with the increasing of the mass percent of Al_2O_3,the desulfurization capacity of the slag significantly decreased. While the increasing of the mass percent of Mg O and Na_2O can significantly promote the desulfurization capability of the slag. In addition,a small amount of the mass percent of Na_2O showed a strong effect on the desulphurization capability,which provided a theoretical basis for the application of the Na_2O-containing secondary metallurgical resources and the optimization of the desulfurization slag system in the desulphurization process for the hot metal.
引文
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[22] Pak J J,Ito K,Fruehan F J. Activities of Na2O in Ca O-based slags used for dephosphorization of steel[J]. ISIJ International,1989,29(4):318.
[2]折媛,巨建涛,郭艳萍,等.基于KTH模型的CaO-SiO2-Al2O3-MgO渣系成分优化研究[J].硅酸盐通报,2014,33(12):3166.(SHE Yuan,JU Jian-tao,GUO Yan-ping,et al. Study of the composition optimization of CaO-SiO2-Al2O3-MgO slag based on the KTH model[J]. Bulletin of the Chinese Ceramic Society,2014,33(12):3166.)
[3]秦哲,廖建军,周剑峰,等.高牌号无取向电工钢RH深脱硫[J].钢铁,2014,49(2):40.(QIN Zhe,LIAO Jian-jun,ZHOU Jian-feng,et al. Deep desulphurization of high grade non-oriented electrical steel in RH process[J]. Iron and Steel,2014,49(2):40.)
[4]方忠强,孙彦辉.高碱度精炼渣脱硫分析及硫分配比预测模型[J].炼钢,2014,30(1):46.(FANG Zhong-qiang,SUN Yanhui. Desulphurization analysis of slag with high basicity and prediction model for sulfur distribution ratio[J]. Steelmaking,2014,30(1):46.)
[5] YANG Xue-min,SHI Cheng-bin,ZHANG Meng,et al. A thermodynamic model of sulfur distribution ratio between CaOSiO2-MgO-FeO-MnO-Al2O3,slags and molten steel during LF refining process based on the ion and molecule coexistence theory[J]. Metallurgical and Materials Transactions:B,2011,42(6):1150.
[6]李霞,丁跃华,黄帮福.高炉CaO-SiO2-Al2O3-MgO-TiO2渣与铁液间硫分配比的热力学模型[J].钢铁研究学报,2012,24(7):19.(LI Xia,DING Yue-hua,HUANG Bang-fu. A thermodynamic model for calculation of sulphur distribution ratio between CaO-SiO2-Al2O3-MgO-TiO2BF slag and hot metal[J].Journal of Iron and Steel Research,2012,24(7):19.)
[7] Takahashi K,Utagawa K,Shibata H,et al. Influence of solid CaO and liquid slag on hot metal desulfurization[J]. Transactions of the Iron and Steel Institute of Japan,2012,52(1):10.
[8] Kikuchi N,Nabeshima S,Takeuchi S,et al. Effect of hot metal temperature and rotation speed on the rate of desulfurization rate by mechanical stirring process[J]. Tetsu-to-Hagane,2009,90(6):322.
[9] Niekerk W H V,Dippenaar R J. Thermodynamic aspects of Na2O and CaF2containing lime-based slags used for the desulphurization of hot-metal[J]. Transactions of the Iron and Steel Institute of Japan,2007,33(1):59.
[10] Chuiko N M. On the structural theory of metallurgical slags[J].Ferrous Met,1959(5):3.
[11]史成斌,郭汉杰,丁汝才,等. CaO-SiO2-MgO-Al2O3渣系与碳饱和铁液间硫分配比的热力学模型[J].过程工程学报,2010,10(s1):158.(SHI Cheng-bin,GUO Han-jie,DING Ru-cai,et al. A thermodynamic model for calculation of sulphur distribution ratio between CaO-SiO2-MgO-Al2O3slags and carbon saturated hot metal[J]. Chinese Journal of Process Engineering,2010,10(s1):158.)
[12]张鉴.冶金熔体和溶液的计算热力学[M].北京:冶金工业出版社,2007.(ZHANG Jian. Computational Thermodynamics of Metallurgical Melts and Solutions[M]. Beijing:Metallurgical Industry Press,2007.)
[13]李显鹏,高金涛,张延玲,等. CaO-FeO-SiO2-Al2O3/Na2O/TiO2渣系与碳饱和铁水间磷分配行为[J].钢铁,2017,52(2):18.(LI Xian-peng,GAO Jin-tao,ZHANG Yan-ling,et al. Distribution behavior of phosphorus between CaO-FeO-SiO2-Al2O3/Na2O/TiO2slags and carbon-saturated iron[J]. Iron and Steel,2017,52(2):18.)
[14]张康晖,张延玲,李凤善,等. CaO-SiO2-Al2O3-Na2O-TiO2-(MgO)渣系与碳饱和铁液间硫分配比的热力学模型[J].钢铁研究学报,2018,30(4):265.(ZHANG Kang-hui,ZHANG Yan-ling,LI Feng-shan,et al. A thermodynamic model for calculation of sulfur distribution ratio between CaO-SiO2-Al2O3-Na2O-TiO2-(MgO)slags and carbon saturated hot metal[J]. Journal of Iron and Steel Research,2018,30(4):265.)
[15] Tsujino R,Nakashima J,Hirai M,et al. Behavior of desulfurization in ladle steel refining with powder injection at reduced pressures[J]. Transactions of the Iron and Steel Institute of Japan,1989,29(1):92.
[16] Mitsutaka Hino,Kimihisa Ito. Thermodynamic Data for Steelmaking[M]. Tohoku:Tohoku University Press,2010.
[17] Elliott J F,Gleiser M,Ramakrishna V,et al. Thermochemistry for Steelmaking[M].[S.l]:Addison-Wesley Pub Co,1960.
[18]朱苗勇.现代冶金学[M].北京:冶金工业出版社,2005.(ZHU Miao-yong. Modern Metallurgy[M]. Beijing:Metallurgical Industry Press,2005.)
[19]黄希祜.钢铁冶金原理[M].北京:冶金工业出版社,2004.(HUANG Xi-hu. Principles of Steel Metallurgy[M]. Beijing:Metallurgical Industry Press,2004.)
[20] Zhang G H,Chou K C,Mills K. Modelling viscosities of CaOAl2O3-SiO2-MgO molten slags[J]. ISIJ International,2012,52(3):355.
[21]张明博,李俊国,马红强.组分含量对CaO-MgO-Al2O3-SiO2四元精炼渣系粘度的影响[J].特殊钢,2013,34(2):28.(ZHANG Ming-bo,LI Jun-guo,MA Hong-qiang. Effect of ingredient on viscosity of CaO-MgO-Al2O3-SiO2quaternary refining slag series[J]. Special Steel,2013,34(2):28.)
[22] Pak J J,Ito K,Fruehan F J. Activities of Na2O in Ca O-based slags used for dephosphorization of steel[J]. ISIJ International,1989,29(4):318.
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