LF精炼渣的热态循环利用研究

Study on Thermal Recycling of LF Refining Slag

以某厂非低硅铝镇静钢的生产为例,对LF炉精炼渣的热态循环利用进行研究。在LF精炼炉各个炉次取渣样和钢样进行分析,对比了LF精炼炉出站钢液成分和夹杂物数量密度的变化。研究结果表明:LF精炼炉渣在不添加石灰调节碱度的条件下,循环利用三次时,钢液当中的S含量超出一般品成分的控制要求,精炼渣成分当中的CaO含量控制在43.58%以上,碱度R2控制在8.58以上,能够满足LF热态精炼渣循环利用对钢液的脱硫要求。随着精炼渣循环利用次数的增加,精炼渣对钢液当中夹杂物的吸附能力指数有明显的下降,精炼渣对钢液当中夹杂物的吸附去除效率降低。

In this paper,ithe thermal recycling of LF furnace refining slag for the production of non-low silicon aluminum killed steel was studied.Slag samples and liquid steel samples were taken from LF refining furnace,and the changes of compositions of liquid steel and quantity density of inclusions in LF refining furnace were analyzed.The research results show that under the condition of adjusting the basicity of LF refining slag without adding lime,the content of S in the molten steel exceeds the requirements of the internal control components when recycling for three times,the CaO content in the refined slag is controlled at more than 43.58%,and the basicity R2 is controlled at more than 8.58,which can meet the desulfurization requirements of the molten steel by the recycling of LF hot refining slag.With the increase of the recycling times of the refined slag,the adsorption capacity index of the refined slag to the inclusion in the liquid steel decreased obviously,and the adsorption and removal efficiency of the refined slag to the inclusion in the liquid steel decreased.