Gasification desulfurization and resource utilization of ladle furnace refining slag

The present situation and utilization mode of LF refining slag were investigated in detail for more than 30 typical iron and steel enterprises in China.It is found that the treatment method of LF refining slag is relatively simple, the utilization level is low and the waste of resources is serious.Meanwhile, LF refining slag is characterized by high optical basicity, high sulfur capacity, high sulfur distribution ratio, low melting temperature, and low viscosity.So LF refining slag could be recycled in smelting process, but sulfur enrichment is a restriction factor during the cyclic utilization.To solve this problem, the sulfur removal test and metallurgical recycling utilization of LF refining slag were carried out.The results show that sulfur in LF refining slag can be oxidized to SO₂by O₂, and it has good desulfurization result when blowing air into the slag at 1643 K and 1673 K.Sulfur removal at 10 min by blowing air is over47%, and over 90%at 60 min, and it can meet the sulfur content requirement of LF refining slag used for smelting process.Finally, a simple and efficient method of LF refining slag used for smelting process is proposed, which goes well with current steelmaking process.