100 t转炉留渣双渣法冶炼高硅高磷铁水试验  

Test of High Silicon and High Phosphorus Hot Metal Smelted by Retaining Slag and Double Slag Method at 100 t BOF

作　　者：高琦 智建国 吴伟[1] 张志兵 张晓峰 关键 Gao Qi;Zhi Jianguo;Wu Wei;Zhang Zhibing;Zhang Xiaofeng;Guan Jian(Department of Metallurgical Technology Research,Central Iron and Steel Research Institute,Beijing 100081;Chief Engineer Office of Baotou Iron&Steel(Group)Co Ltd,Baotou 014010;Steelmaking Plant,Baotou Steel(Group)Corp,Baotou 014010;Technical Center of Baotou Steel(Group)Corp,Baotou 014010)

机构地区：[1]钢铁研究总院冶金工艺研究所,北京100081 [2]包钢钢联股份有限公司总工室,包头014010 [3]包钢钢联股份有限公司炼钢厂,包头014010 [4]包钢技术中心,包头014010

出　　处：《特殊钢》2020年第6期41-45,共5页Special Steel

基　　金：内蒙古自治区应用技术研究与开发资金计划;北京市自然科学基金面上项目(201801001)(2172057)资助。

摘　　要：针对钢厂铁水硅和磷含量较高的特点,采用转炉留渣双渣冶炼工艺以获得稳定的铁水脱磷率。吹炼3 min后加入石灰和污泥球等造渣材料,供氧强度0~3 min时为2.5 m^3/(t·min),3~4.5 min时为3.2 m^3/(t·min),温度控制在约1 320℃。转炉一次倒渣后,继续吹炼,加入后期造渣料,待一氧化碳体积分数稳定时,适当提高氧枪枪位,促进化渣,并进行终点碳控制。试验结果表明:脱磷期铁水平均脱磷率为58.09%,脱碳期钢水平均脱磷率为85.56%;当半钢温度为1 320℃炉渣碱度为2.0,炉渣TFe含量为18%时,在脱磷期能获得较好的铁水脱磷效果;当转炉钢水一倒温度为1 580℃,终渣碱度为3.5,炉渣TFe含量为20%时,在脱碳期能够获得较好的脱磷效果;转炉终点[P]_e/[P]_r为0.90;试验中得到脱磷期和脱碳期炉渣的岩相组成适合铁水脱磷。In view of the high silicon and phosphorus content of hot metal in a steel works,a converter slag-retaining double-slag smelting process is used to obtain a stable dephosphorization rate of hot metal.The specific process is to add slag-forming materials such as lime and sludge balls after the start of the blowing process for 3 min.The oxygen supply intensity is 2.5 m^3(t·min)at 0~3 min,and 3.2 m^3/(t·min)at 3~4.5 min.The temperature is controlled at about 1320℃.After the converter has first deslagging,it starts to blow and adds the late slag forming material.When the carbon monoxide in the furnace rises to a stable level,the oxygen lance position is raised appropriately to improve slagging and control the end-point carbon.The test results show that the average dephosphorization rate of hot metal in the dephosphorization period is 58.09%,and the average dephosphorization rate of molten steel in the decarburization period is 85.56%;When the temperature of the semi-steel is 1320℃,the basicity of the slag is 2.0,and the TFe content in the slag is 18%,a better dephosphorization effect can be obtained in the dephosphorization period.When the molten steel temperature of the converter liquid after first deslagging is 1580℃,the basicity of the final slag is 3.5,and the TFe content in the final slag is 20%,a better dephosphorization effect can be obtained in the decarburization period.[P]_e/[P]_r ratio at the end of the converter is 0.90.The petrographic composition of the slag during dephosphorization and decarburization poriod from the experiment is suitable for dephosphorization of hot metal.

关 键 词：100T转炉 留渣双渣工艺 高硅高磷铁水 脱磷率 磷分配比 

分 类 号：TF713.3[冶金工程—钢铁冶金]