无氟预熔型精炼渣的设计与应用  

Design and application of LF refining pre-melted slag without CaF_2

作　　者：刘伟[1] 赖朝彬[1] 冯小明[2] 陈三芽[2] 

机构地区：[1]江西理工大学冶金与化学工程学院,江西赣州341000 [2]新余钢铁有限责任公司,江西新余338001

出　　处：《有色金属科学与工程》2012年第5期45-49,共5页Nonferrous Metals Science and Engineering

摘　　要：为了避免含氟精炼渣中氟的污染,结合炉渣基础理论,经过熔渣黏度和熔点影响因素的分析并通过正交试验得出优选的无氟预熔型精炼渣组成CaO=48%、Al2O3=40%、SiO2=4%、MgO=8%,该精炼渣的黏度和熔点分别为:0.78 Pa.s和1389℃.精炼渣的工业试验表明,精炼初期成渣速度快,为加快生产节奏奠定了基础.与原含氟精炼渣相比,避免氟污染问题;钢液平均脱硫率为86.5%,提高了7.5%;连铸坯中N、H、O的平均含量分别为:47.5×10-6、2.4×10-6、32.5×10-6,分别降低了13%、15%、15%;连铸坯中夹杂物的尺寸显著地减小,连铸坯的质量得到提高.Preferred fluorine-free pre-mehing slag composition was attained by analyzing the slag viscosity and melting point of impact factors and orthogonal experiments （CAO=48 %, A1203=40 %, SiO2=4 %, MgO=8 %） to avoid the fluorine pollution based on the molten slag theory. The viscosity and melting point were 0.78 Pa＇s and 1389℃. The industrial tests showed that the slag quickly formed at the beginning of refining, which established the foundation to accelerate the production pace. The slag, compared with the slag with CaF2, showed no pollution of fluorine. The average desulfurization rate of steel was 86.5 % with an addition by 7.5 %. The average contents of N, H, O in the billet were 47.5x10-6, 2.4x10-6, 32.5x10-6 respectively, with reductions by 13 %, 15 % and 15 %. The billet inclusion size dropped significantly with improving billet.

关 键 词：LF精炼 预熔精炼渣 脱硫 无氟 

分 类 号：TF769[冶金工程—钢铁冶金]