Effect of High Coal Injection on Low Silicon Ironmaking Process

The effects of Fe 2O 3 addition in MgO CaO refractory on desulfurization of liquid iron were studied by SEM, EDA and chemical analysis. Fe 2O 3 of 1 % and 4 % were added to MgO CaO refractory as the lining of graphite crucible in which 150 g iron powder with sulfur of 0 15 % was charged. It is found that when the sample is heated at 1 600 ℃ for 40 min, 60 min and 90 min, the addition with Fe 2O 3 of 1 % improves desulfurization greatly. However, the desulfurization ratio of the refractory with Fe 2O 3 addition of 4 % is less than that with Fe 2O 3 addition of 1 %. For the soaking time of 90 min, the desulfurization ratio is less than those of 40 min and 60 min. These phenomena were explained by the contrary roles of O 2- and Fe 2+ formed by reaction between liquid iron and Fe 2O 3 on desulfurization.

碱性耐火材料的脱硫作用

在不同CaO含量的碱性耐火材料坩埚中加入不同硫含量的铁粉 ,于 16 0 0℃保温不同时间 ,然后分析金属中残余硫含量。结果表明 :碱性耐火材料 ,特别是CaO有脱硫作用 ,2 0 %的CaO即可取得明显的脱硫效果 ;保温时间超过 30min后 ,出现“回硫”现象 ;

碱性耐火材料脱磷作用的研究

在石墨坩埚内 ,衬一层厚约 1 0mm的不同碱性内衬 ,加入 1 0 0g左右不同磷含量的还原铁粉 ,经 1 60 0℃ ,30min熔炼并对冷却后试样进行化学、扫描电镜和能谱分析。发现耐火材料中含有2 5 %CaO时可使金属中的磷含量大幅度下降 ,而进一步提高CaO含量可在一定程度上提高其脱磷率 ,但提高的幅度有限。熔融金属中原始磷含量也影响CaO的脱磷率 ,但原始磷含量达到 0 .1 %时 ,其影响已很小。