Abstract: 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.