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本文是通过火力模型试验,对顶底复合吹炼法底吹不同气体(Ar、N_2、CO_2)时,钢中[N]含量的变化进行初步探讨,以寻求经济、合理的操作工艺。试验结果表明:全程采用Ar气搅拌,Ar气纯度为99.99％,铁水[N]含量为52～72ppm,供气强度为0.54～0.73标米~3/分·吨,终点钢中[N]含量为40ppm以下;用CO_2搅拌,当纯度为95％时,则终点钢中[N]含量为40～50ppm;采用N_2气搅拌,纯度为99.99％,则终点钢中[N]含量为90～100ppm,比LD法高40～50ppm。采用主吹期的56～68％的时间里用Ar置换N_2气操作,可使终点钢中[N]含量与全程用Ar气搅拌的结果相同。同时节省Ar气40～50％。
In this paper, the change of [N] content in steel under the blowing of different gases (Ar, N 2, CO 2) at the bottom and bottom by means of fire model test is explored in order to seek economical and reasonable operation process. The results showed that the Ar gas was used in the whole process. The purity of Ar gas was 99.99%, the content of [N] in molten iron was 52-72ppm, the gas supply strength was 0.54-0.73m3 / min, the content of [N] The content of [N] in the finish steel is 40 ~ 50ppm; with N 2 gas stirring, the purity is 99.99%, the content of [N] in the finish steel is 90 ~ 100ppm , 40 ~ 50ppm higher than the LD method. Using 56 ~ 68% of the main blowing period of time with Ar replacement N 2 gas operation, the end of the steel [N] content and the entire process with Ar gas stirring the same. Ar gas while saving 40 to 50%.