BaCO_3基熔剂对高炉锰铁脱硅脱磷联动处理的工艺实验

Technological Study on Linkage Treatment for Desiliconization and Dephosphorization of Ferromanganese Produced by Blast Furnace by BaCO 3 Based Flux

在硅化钼炉和１００ｋｇ级中频感应炉中，采用ＢａＣＯ３基熔剂对高炉锰铁进行了脱硅脱磷联动实验。实验结果表明：对硅含量（质量分数）小于等于１．０％的高炉锰铁经一次预脱硅后再进行氧化脱磷时，可获得约９０％的脱硅率和４０％～６２％的脱磷率，在控制实验体系氧位下，联动处理全过程的锰氧化损失Δ［Ｍｎ］＜１．０％。锰铁合金脱磷前的硅含量显著影响脱磷率，将硅含量控制在小于等于０．２８％时，可得到的相应脱磷率大于４０％。ＢａＣＯ３基熔剂作为联动处理时的脱硅和脱磷剂，其优化组成为ＢａＣＯ３（８０％）－ＢａＦ２（１０％）－ＭｎＣＯ３（１０％）。

The linkage experiments of desiliconization and dephosphorization of ferromanganese produced by blast furnace by BaCO 3 based fluxes were performed in a MoSi 2 furnace and a 100 kg induction furnace. After the linkage dephosphorization and desiliconization of the ferromanganese with Si content no more than 1.0 %, desiliconization rate of about 90 % and dephosphorization rate of 40 %～62 % were achieved. Less than 1 % of Mn was lost during the linkage treatment by controlling the systematic oxygen potential. The suitable Si content for the dephosphorization of ferroalloy by oxidizing has been determined. The optimum composition of BaCO 3 based flux for desiliconization and dephosphorization is BaCO 3(80 %) BaF 2(10 %) MnCO 3(10 %).