包钢炼钢厂铝镇静钢工艺优化

Process optimization of aluminum killed steel in Baogang Steel Mill

为了解决随着铝镇静钢的产量和品种大幅度增加,铝镇静钢生产经常发生水口结瘤或钢水中钙质量分数高导致的控流不好等生产问题,通过对包钢炼钢厂5号铸机生产铝镇静钢存在的问题进行系统分析研究,采用沉淀脱氧（一次）＋扩散脱氧相结合的脱氧制度;针对精炼渣系进行优化,并采用新的成分判定标准;优化钙处理工艺参数,控制钢水成分、调整喂丝机位置及角度等,实行精准钙处理,并通过实际验证,通过对方案优化前后进行比较,优化后获得良好的经济效益,且很大程度上节省了材料消耗,符合国家当前钢铁行业降耗、绿色智能化的发展要求。

Since the output and the variety of the aluminum killed steel increased in recent years,the production problem of the Al killed steel such as the clogging at the nozzle and the poor flow control due to the high Ca mass percent of the molten steel has attracted more and more attentions of researchers. In order to solve those problems,the problem in the production of the aluminum sedation steel in the No.5 casting machine of the BAO GANG Steel Mill was systematically analyzed. The deoxidization system combined the precipitation deoxidization（primary）and the diffusion deoxidization were used,and a new determination standard was adopted. Also,the refining slag system and the process and parameters of calcium treatment were optimized to control the composition of the molten steel and adjust the position and the angle of the feeding machine and so on,achieving the precision calcium treatment. The scheme was verified by the actual experiment. Compared with the scheme before optimization,a better economic benefit was obtained after the optimization,and the material consumption was saved in a great extent,which conforms to the current consumption of the steel industry and the green intelligentization of the state.