转炉四元熔渣中锰矿含碳球团熔化行为模拟研究
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摘要
采用实验模拟与数值模拟相结合的方法,对锰矿含碳球团在转炉4元熔渣(51CaO-16SiO_2-10MgO-23FeO)中的熔化行为进行研究。结果表明,锰矿含碳球团在熔渣中还原时生成了固态产物层,减少固态产物层的厚度和存在时间,能加快球团在熔渣中的还原速度;基于一维非稳态导热微分方程建立了含碳球团熔化过程的数值模型,模型计算与实验结果能较好吻合;采取不同条件进行模拟计算发现,当熔渣温度为1 600℃时,假设固态产物层不存在,球团还原时间可缩短35%左右;对锰矿含碳球团进行预热、适当缩小球团直径及降低还原产物熔点均能减少固态产物层存在时间,从而提高球团还原速度。
The melting behavior of single manganese ore pellet containing carbon in converter Quartemary slag(51 CaO-16 SiO_2-10 MgO-23 FeO) was investigated by experiments and mathematical model. The results showed that the solid product layer was generated in the reduction process of manganese ore pellet containing carbon, and the rate of reduction can be accelerated by reduce the thickness and existing period of the solid product layer. Then the numerical model of melting process was established based on one-dimensional unsteady heat conduction differential equation, and the result of calculation was coinciding with the experimental data, thus illuminated that the model is effective. Simulated calculation to different conditions and the results showed that, reduction time of pellet can be shorten by about 35% to assume that the solid product layer not exist in reduction process when the temperature of the slag was 1 600 ℃. Preheated pellet, reduce the pellet diameter and lower melting point of reduction product can reduce exist time of solid product layer, and improve the pellet reduction rate.
The melting behavior of single manganese ore pellet containing carbon in converter Quartemary slag(51 CaO-16 SiO_2-10 MgO-23 FeO) was investigated by experiments and mathematical model. The results showed that the solid product layer was generated in the reduction process of manganese ore pellet containing carbon, and the rate of reduction can be accelerated by reduce the thickness and existing period of the solid product layer. Then the numerical model of melting process was established based on one-dimensional unsteady heat conduction differential equation, and the result of calculation was coinciding with the experimental data, thus illuminated that the model is effective. Simulated calculation to different conditions and the results showed that, reduction time of pellet can be shorten by about 35% to assume that the solid product layer not exist in reduction process when the temperature of the slag was 1 600 ℃. Preheated pellet, reduce the pellet diameter and lower melting point of reduction product can reduce exist time of solid product layer, and improve the pellet reduction rate.
引文
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[12] Navrotsky A, Ziegler D and Oestrike R, et al. Calorimetry of Silicate melts at 1773 K:Measurement of Enthalpies of Fusion and of Mixing in the Systems Diopside Anorthite Albite and Anorthite Forsterite[J]. Contributions to Mineralogy and Petrology, 1989, 101(1):122-130.
[13]朱德才.固体界面接触换热系数的实验研究[D].大连:大连理工大学材料科学与工程学院,2007:49-55.
[14]比.伏德,贾天有.关于炉渣熔体密度的计算[J].科技译丛(重庆),1994(1):54-57.
[15]Tomohim A, Hiromichi 0 and Reijiro T. Measurement and Modeling of Thermal Conductivity for Dense iron Oxide and Porous Iron ore Agglomerates in Stepwise Reduction[J]. ISU International,1992, 32(7):829-837.
[2]周超洋.氧化锰矿碳热法固相还原制备锰铁合金[D].长沙:中南大学冶金与环境学院,2012:8-12.
[3]张波.锰矿自还原压块转炉直接合金化基础研[D].武汉:武汉科技大学材料与冶金学院,2014:18-20.
[4]汪琦.铁矿含碳球团技术[M].北京:冶金工业出版社,2005:45-50.
[5]何平,邓开文,张荣生.预还原球团在铁碳熔体中熔融还原传质规律的研究[J].化工冶金,1994, 15(1):15-22.
[6]孟繁明,赵庆杰.铁矿石含碳球团中碳的气化反应速度对球团熔融的影响[J].钢铁研究学报,2007, 19(12):5-9.
[7]何奕波.氧化铁球团在熔渣中熔融过程的研究[D].沈阳:东北大学材料与冶金学院,2011:15-17.
[8] Verein Deutscher Eisenhüttenleute. Slag Atlas[M]. Verlag Stahleisen mbH, 1995.10:607
[9] YU Chang-ming. Heat Transfer and its Numerical Analysis[M]. 1st ed. Beijing:Tsinghua University Press, 1982:42-47.
[10] Mathers W j, Madden A and Edgar L. Simultaneous Heat and Mass transfer in Free Convection[J]. Industrial and Engineering Chemistry, 1957, 49(6):961-968.
[11] Kazuhiro N, Masahiro S and Kazuhiro S G. Thermal Conductivitiesof Slags for Ironmaking and Steelmaking[J]. Tetsu-to-Hagane,1983, 69(11):1417-1424.
[12] Navrotsky A, Ziegler D and Oestrike R, et al. Calorimetry of Silicate melts at 1773 K:Measurement of Enthalpies of Fusion and of Mixing in the Systems Diopside Anorthite Albite and Anorthite Forsterite[J]. Contributions to Mineralogy and Petrology, 1989, 101(1):122-130.
[13]朱德才.固体界面接触换热系数的实验研究[D].大连:大连理工大学材料科学与工程学院,2007:49-55.
[14]比.伏德,贾天有.关于炉渣熔体密度的计算[J].科技译丛(重庆),1994(1):54-57.
[15]Tomohim A, Hiromichi 0 and Reijiro T. Measurement and Modeling of Thermal Conductivity for Dense iron Oxide and Porous Iron ore Agglomerates in Stepwise Reduction[J]. ISU International,1992, 32(7):829-837.