CO2在转炉冶炼中低碳铬铁过程中的探索性应用

探索了一种采用转炉由高碳铬铁“一步法”冶炼中低碳铬铁的新工艺。该工艺与氩氧混吹脱碳法( Argon Oxygen De-carburization,AOD)类似,不同之处在于用CO2代替氩气作为搅拌气体吹入熔池。实验结果表明：采用CO2对高、中碳铬铁脱碳是可行的；在高碳铬铁冶炼中碳铬铁初始阶段大量喷吹CO2能取得更好的脱碳效果,而在冶炼后期,高比例的O2适量添加CO2则更有利于脱碳,在当前实验条件下,较佳的脱碳气氛为25%CO2+75%O2(体积分数)；CO2的引入对提高铬的回收率有积极作用,同时CO2含量越高,保铬效果越好。实验同时发现,CO2对高碳铬铁脱硫有积极作用。

Exploratory application of CO2 in M--LCFeCr production with converter process

A New process for refining medium-low carbon ferrochromium ( M- LCFeCr ) from high carbon ferrochromium ( HCFeCr) through converter was discussed. This technology is similar to argon oxygen decarburization process ( AOD) with the differ-ence of carbon dioxide being introduced as mixing gas. The results show that, it is feasible to use CO2 for decarburization of high car-bon and medium carbon ferrochrome. Better decarburization effect is obtained by using high volume ratio CO2 at the initial stage of pro-ducing MCFeCr through HCFeCr, while at the last stage of refining, viz. low carbon content melt, higher O2 concentration is better for carbon removal. The optimal gas composition for decarburization is 25%CO2 +75%O2 ( volume ratio) in the current experiments. CO2 introduction is benefit for enhancing the yield of chromium, and higher CO2 leads to better Cr retention. It has positive effect of CO2 on desulfurization of HCFeCr melt.