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.