BaCO_3基熔剂对高炉锰铁预脱硅处理的实验研究

Experimental Study on Desiliconization of Blast Furnace Ferromanganese by BaCO_3-based Fluxes

实验室内，用BaCO3基熔剂对硅含量为0．8％～1.7％的高炉锰铁进行预脱硅处理，处理温度1300～1400℃．实验结果表明，对于初始硅含量[Si]1＞1．0％和[Si]1≤1.0％的两种类型高炉锰铁，前者需要通过二次预脱硅处理，后者只需实施一次脱硅预处理，脱硅后的两类合金均能满足后步氧化脱磷关于硅含量限制范围的要求。通过实验确定了脱硅剂的优化组成是BaCO3（80％）－MnCO3（10％），实验发现，温度对脱硅的影响关系与脱硅剂组成相关，在1300～1400℃范围内，对于上述优化熔剂组成，温度的变化对脱硅效果影响不大，用该熔剂对[Si]1≤1.0％的高炉锰铁进行预脱硅处理，当熔剂添加量占合金量的10％时，能获得90％左右脱硅率，而锰的氧化损失为－0.98％．

The experimen's of desiliconization for blast furnace ferromanganese containing various Si contents ranging from about 0. 80% to 1 .70% with BaCO3 -based fluxes are conducted in the laboratory scale. The results show that through secondary or first desiliconization treatment on balst furnace ferromanganese containing Si contents above 1.0% or under 1 .0%, the limiting value requirements of Si content in Le - Mn alloys during dephosphorization treatment can be satistied. The optimum composition for BaCo3- based fluxes is established to be BaCO3(80%) -BaF2(10%) - MnCO3(10%).It is found that the effect of temperature in the range of 1300 ~ 1400℃ on desiliconization treatment is not significant for abovc mentioned fluxes composition.