LF精炼渣的气化脱硫及资源化利用

Gasification desulfurization and resource utilization of ladle furnace refining slag

针对我国30多家钢铁企业LF精炼渣处理现状及利用模式进行详细调研发现:LF精炼渣处理方式较为简单,利用层次低,资源浪费严重.同时,LF精炼渣具有光学碱度、硫容量和硫分配比高,熔化温度和黏度较低的特点,可以在冶金内循环利用,但渣中硫的富集成为其在冶金内循环利用中的限制环节.基于此,开展LF精炼渣氧化除硫试验及冶金回用分析研究.结果表明:LF精炼渣中的硫可被O2氧化成SO2;在1370℃和1400℃时,吹气10 min除硫率可达47%以上,而吹气60 min后除硫率基本可达90%以上,吹空气除硫效果明显,完全满足LF精炼渣冶金回用时对硫含量的要求.最终提出了一种简单高效且与现行生产工艺结合较好的LF精炼渣在冶金中再利用的新思路.

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 SO2 by 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 over 47%,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.