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本文主要介绍真空感应炉生产超低碳硅纯铁的试验。试验采用了含碳0.034％、硅0.30％的纯铁原料。试验表明了 Fe—C—O—Si 熔体的平衡[C％]·[0％]·[Si％]体积在7.2×10~(-6)～1.2×10~(-5)之间。为此,利用热力学对 Fe—C—O—Si 熔体的不同平衡状态进行分忻。通过分析可知在熔体中有生成气相 SiO、FeO_xSiO_2渣相条件,并结合试验数据得出以下结论:在真空下熔炼超低碳硅纯铁时,硅以两种氧化产物(SiO,SiO_2)去除。提高真空度对去除 SiO 有利,熔池表面压力大于 SiO 蒸气压时,SiO 反应停止。这时 SiO_2为主要去硅产物。随着熔体氧含量上升,促使 SiO_2固体转变成复合的 FeO·SiO_2熔融状渣相,其比例值 x=1.2。熔渣的数置取决于原材料的 Si 含量。同时钢液的氧含量取决于渣相存在的 FeO 含量多少。
This article describes the vacuum induction furnace production of ultra-low carbon silicon pure iron test. The test uses a 0.034% carbon, 0.30% silicon iron material. The experiment shows that the equilibrium [C%] · [0%] · [Si%] of the Fe-C-O-Si melt is between 7.2 × 10 -6 and 1.2 × 10 -5. To this end, the use of thermodynamics of Fe-C-O-Si melt different equilibrium state Xin Xin. The analysis shows that there are gas phase SiO and FeO_xSiO_2 slag phases in the melt, and the following conclusions are drawn from the experimental data: In the smelting of ultra-low carbon silicon iron under vacuum, silicon is removed by two kinds of oxidation products (SiO and SiO_2) . Increasing the degree of vacuum on the removal of SiO beneficial, molten pool surface pressure is greater than the SiO vapor pressure, SiO reaction stopped. At this moment SiO 2 is the main silicon removal product. As the melt oxygen content increases, the SiO 2 solid is transformed into a composite FeO · SiO 2 molten slag phase, with a ratio value of x = 1.2. The number of slag depends on the Si content of raw materials. At the same time the oxygen content of molten steel depends on the presence of slag FeO content.