摘要
研究于1250～1500℃和大气气氛下,用Na_2O-SiO_2系熔剂对高锰金属熔体(13～25％Mn,0.9～5.0％C,0.2～0.4％Si,0.05～0.15％P,<0.05％S)进行了53炉实验室规模的脱磷实验,探讨了熔剂的最佳组成及熔体的处理温度、碳和锰的含量、熔剂的氧位(添加Na_2CO_3,MnO_2Fe_2O_3),对脱磷和锰损的影响,比较了不同的熔剂制备和加入方法的脱磷和锰损情况,推测了本研究脱磷的机理。实验中最大的脱磷率为65％。 另外,实验结果分析中,通过应用规则熔渣离子模型计算熔剂终渣的γ_(Mno),γ_(Feo)对熔剂的脱磷能力进行了估计。通过对实验数据的回归分析还得到终点磷的活度与初始熔剂组成、处理温度及锰活度之间的关系式: 21ga_[P]=51ga_[Mn]+26939.37/T+0.0153T+0.148×(10-％Fe_2O_3)-0.6×(xNa2o/xsio2)-39.08(1250～1400℃)式中 x_(Na2o)/x_(sio2)一熔剂初始Na_2O和SiO_2的摩尔分数比,用该式对用预熔和熔化法进行脱磷的结果进行预测与实验结果相一致。
Oa the laboratory scale (about 200 g of melt, 25 g of flux),53 runs of experiments have been carried out with the purpose of dephosphorization of melt containing high manganese ( 13-25 % Mn, 0.9-5 %C, 0.2-0.4 %Si, 0.05-0.15 %P, <0.05 %S ) with Na2O-SiO2 fluxes, at the temperatures of 1250-1500℃ and the atmosphere of air. Some factors influencing dephorization and loss of manganese such as the optimum compositions of fluxes, temperature,the contents of carbon and manganese and the potential of flux were studied. The dephosphorization and loss of manganese for different methods of preparing and adding fluxes were compared. The mechanism of dephosphorization was discussed. The highest degree of dephosphorization obtained was about 65 %.In the analysis of experimental results,applying yMnO, YFeo calculated by regular solution model, we predicted the ability of flux. The relationship between a[p] and a[Mn] at the end of runw,hich is relative to the compositions of fluxes and temperature, has been built by the regression analysis of experimental data.2lga[p] =5lga[Mn] +26939.37/T +0.0153T + 0.148×( 10- %Fe2O3 ) -0.6× ( xNa2O/xsio2) -39.08 (1250-1400℃)where, xNa2O/xs io2--molar percent ratio between Na2O and SiO2. The values preparatorily evaluated by this formula are approximate to the experimental results under the condition of dephosporization using the methods of melting and preparatory melting.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
1992年第S1期51-58,共8页
Journal of Iron and Steel Research
