120t转炉冶炼低磷钢深脱磷技术  

Study on dephosphorization technology of low phosphorous steel smelting in 120 t BOF

作　　者：吴明[1] 王军[1] 李应江[1] 龙胜平[1] 尹丰[1] 鲍磊[1] 

机构地区：[1]马鞍山钢铁股份有限公司第一钢轧总厂,安徽马鞍山243000

出　　处：《炼钢》2015年第1期17-21,共5页Steelmaking

摘　　要：为了达到低磷钢对成品磷质量分数小于0．010％的要求，根据温度、炉渣碱度、渣中w（FeO）以及搅拌等对钢液脱磷的影响，马鞍山钢铁股份有限公司120t转炉应用烟气分析动态控制炼钢技术，采用留渣双渣操作法，制定合理的装入、造渣、供氧制度，优化脱磷参数，通过500多炉次实践对比分析，确定合适的倒炉温度为1540～1580℃，w（C）=0．10％～0．25％，终渣碱度3．0～3．5，w（FeO）=15％～23％，及适合的搅拌强度以达到脱磷率95．2％良好效果，实现了转炉出钢磷质量分数小于0．007％，以及终点碳温双命中96．4％的目标。In order to make the requirement of phosphorus mass fraction less than 0. 010 % for low phosphorous steel, and according to the effect of temperature, slag basicity, w （FeO） of slag and mixing parameters on dephosphorization, the offgas analysis dynamic control steelmaking model was applied on 120 t BOF of Maanshan Iron Steel Company Limited. ＂Slag-Remaining ＋ Double-Slag＂ technology, suitable loading system, slagging system and oxygen supply system, optimizing dephosphorization parameter were used in steelmaking. Through the analysis and comparison of 500 experiments, dephosphorization rate 95.2 % can be achieved by taking measures such as the temperature and the carbon mass fraction of the first turning down 1 540 - 1 580 %C and 0. 10 % - 0. 25 %, final slag basicity 3.0 - 3.5, w（FeO） = 15 % - 23 %, and suitable stirring intensity. And the phosphorus mass fraction of converter tapping is less than 0. 070 % and the hit rates of carbon contdnt and temperature both meet the requirement of 96.4 %.

关 键 词：转炉 低磷钢 烟气分析 脱磷控制 

分 类 号：TF704.4[冶金工程—钢铁冶金]