GOR冶炼不锈钢深脱硫工艺

以70 t EAF-GOR-LF-CC工艺生产304不锈钢为背景，分别对GOR冶炼过程初始钢液、终点钢液以及还原渣取样分析，重点考察了还原渣碱度、渣中残余Cr2O3质量分数(w((Cr2O3)))以及钢液初始硫质量分数(w(Ss]))对钢液深脱硫效果的影响规律，得出了以下结论：还原渣碱度对脱硫有较大影响，高炉渣碱度有利于钢液脱硫，但当炉渣碱度达到1.75以上时，炉渣碱度对终点硫质量分数(w(Sf]))的影响逐步变小。还原渣中残余Cr2O3对脱硫有阻碍作用，尽可能降低渣中w((Cr2O3))有利于提高GOR脱硫效果，当w((Cr2O3))降低到0.3%以下时，表观渣-钢间硫分配比(LS°=w((S))/w(S]))明显升高。GOR初始钢液硫质量分数越低，越容易获得最终低硫钢液，当w(Ss])＜0.07%时，钢液中最低w(Sf])更容易降低到0.004%以下。根据GOR工业试验结果得出了冶炼终点时优化的表观渣-钢间硫分配比( LS°)随还原渣碱度、w((Cr2O3))和w(Ss])的变化关系。

Deep desulfurization process of stainless steel in GOR converter

In order to achieve deep desulfurizationin 70 t GOR converter of AISI304 stainless steel,the influences of ba-sicity of reduction slag,the amount of residual Cr2O3 in reduction slag and the initial sulfur content of molten steel on the desulfurization efficiency based on EAF-GOR-LF-CC process were studied by sampling the initial molten steel,both the final molten and slag in GOR converter. Results showed that the basicity of slag had a great influence on the desulfur-ization efficiency. The influence of basicity on final sulfur content became stable when the basicity was higher than 1.75,although higher basicity was in favor of desulfurization.A small amount of residual w((Cr2O3)) in reducing slag of GOR converter still had a negative effect on the desulfurization. A low w((Cr2O3)) as far as possible canimprovethe effi-ciency of desulfurization and the apparent distribution ratio of sulphurincreased significantly when w((Cr2O3)) was lower than 0.3%.The lower initial sulfur content,the easier the lower final sulfur content. The lowest w(Sf]) was easy to reach below 0.004% when the initial w(Ss]) was less than 0.07%.Optimized apparent distribution ratio of sulphurwith the change of basicity,w((Cr2O3)) and initial sulfur content w(Ss]) was obtained based on the industrial results at the end of GOR converter.