无氟环保型KR脱硫剂的研究与应用  

Research and application of fluorine-free environment friendly KR desulfurizer

作　　者：韩宝 邓勇 杨利彬[2] 王龙星 HAN Bao;DENG Yong;YANG Li-bin;WANG Long-xing(No.4Steel Making and Rolling General,Masteel,Maa'nshan 243001,Anhui,China;Department of Metallurgical Technology Research,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]马钢第四钢轧总厂,安徽马鞍山243001 [2]钢铁研究总院有限公司冶金工艺研究所,北京100081

出　　处：《连铸》2022年第5期120-124,共5页Continuous Casting

摘　　要：无氟环保脱硫剂对于环境和氟资源保护有重要意义,通过对铁水脱硫机理进行了计算分析,得出采用Al_(2)O_(3)微粉替代萤石作为KR铁水脱硫的助熔剂能够促进助熔作用的同时,降低铁水氧活度、提高反应温度。通过熔点及工艺研究获得最优无氟脱硫剂配比为15:85。工业试验结果表明,在脱硫剂中加入一定量的Al_(2)O_(3)有利于加快脱硫反应的速度,降低石灰的熔点,增加脱硫剂的脱硫率,提高石灰颗粒的利用率。无氟脱硫剂平均消耗量降低0.3 kg/t以上,平均终点硫质量分数为0.0031%,脱硫率提高为86.13%,满足铁水脱硫任务的需求,实现了无氟脱硫剂的完全替代。Fluorine-free environmental protection desulfurizer is significance for the protection of environmental and fluorine resources.Through the calculation and analysis of the desulfurization mechanism of molten iron,it is concluded that using Al_(2)O_(3)micro powder instead of fluorite as flux for KR molten iron desulfurization can promote the flux,reduce the oxygen activity of molten iron and increase the reaction temperature.Through melting point and process research,the optimum ratio of fluoride-free desulfurizer is 15∶85.The experimental results showed that adding a certain amount of Al_(2)O_(3)into the desulfurizer is beneficial to accelerate the speed of desulfurization reaction,reduce the melting point of lime,increase the desulfurization rate of desulfurizer,and improve the utilization rate of lime particles.The average consumption of free-fluorine desulfurizer is decreased more than 0.3 kg/t,the average sulfur content was 0.0031%,and the average desulfurization rate was 86.13%.It can meet the demand of hot metal desulfurization task and realize the complete replacement of fluorine desulfurizer.

关 键 词：铁水脱硫机理 Al_(2)O_(3)微粉 无氟脱硫剂 脱硫率 平均终点硫质量分数 

分 类 号：TF704.3[冶金工程—钢铁冶金]