Study on Si Transfer Mechanism in a Blast Furnace

高炉硅转移机理研究

• 批准号: 60470059
• 负责人: SUITO Hideaki
• 金额: $ 2.69万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60470059/
• 关键词: Blast furnace; Silicon transfer; Silica reduction; SiO generation; 高炉系スラグ

An induction furnace was used for melting and CO gas was introduced.1. <SiO_2> reduction by slag-metal reaction.The Si reduction rate between CaO- <SiO_2> - <Al_2O_3> -0-5%FeO(-MgO) slag and carbon-saturated iron melt was measured by the use of <Al_2O_3> or graphite crucible. Silica reduction rate was controlled by the Si transfer in metal. The oxidation of Si in metal was controlled by the FeO transfer in slag. The effect of FeO on the progress of Si reduction between slag and metal was investigated in terms of the change in oxygen potential at the slag/metal interface. It was found that <SiO_2> can be reduced from slags with FeO of less than 2% to the extent of usual content of Si in hot metal (0.2%), since the oxygen potential at slag/metal interface may not be controlled any more by FeO in slag.2. SiO generation from blast furnace type slag.The amount of SiO generation by the reaction of CaO- <SiO_2> - <Al_2O_3> slag with graphite was measured in the temperature range from 1700゜ to 1800゜C. The rate of SiO generation was controlled by the <SiO_2> transfer in the slag with low activity of <SiO_2> , and by the reaction of C with <SiO_2> in the slag with high activity of <SiO_2> . Addition of SiC increased the interfacial area between slag and graphite, total amount of SiO generation and particularly the rate of SiO generation at lower temperature.

采用感应炉熔炼，通入CO气体。 1．渣-金属反应还原<SiO_2>。采用<Al_2O_3>或石墨坩埚测定了CaO-<SiO_2>-<Al_2O_3>-0-5%FeO(-MgO)渣与碳饱和铁液之间的Si还原率。二氧化硅的还原率由金属中的硅转移控制。金属中Si的氧化受炉渣中FeO转移的控制。通过炉渣/金属界面氧势的变化，研究了FeO对炉渣与金属之间Si还原进程的影响。研究发现，FeO含量低于2%的炉渣中的<SiO_2>可以被还原至铁水中Si的通常含量（0.2%），因为炉渣/金属界面处的氧势不再受炉渣中FeO的控制。2．高炉型炉渣的SiO生成量。在1700゜～1800゜C的温度范围内测定CaO-<SiO_2>-<Al_2O_3>炉渣与石墨反应生成的SiO量。 SiO_2>活性低的炉渣中SiO的生成速度受<SiO_2>的转移控制，<SiO_2>活性高的炉渣中SiO的生成速度受C与<SiO_2>的反应控制。 SiC的添加增加了炉渣与石墨之间的界面面积、SiO生成总量，特别是在较低温度下SiO生成速率。