Optimization of blast furnace charge structure based on MgO transfer
The changes in physical properties,metallurgical properties of the pellets and sinter were investigated with different magnesium contents through experiments in this article,aiming to transfer some MgO from sinter to pel-lets.The results showed that with the increase of MgO content in pellets and the decrease of MgO content in sinter,the reducibility and soft melting of pellets were significantly improved,and the drum strength and reducibility of sinter were also significantly improved.At the same time,by utilizing the high-temperature interactive reaction characteristics,the structure of the blast furnace burden was optimized.The starting temperature of the softening of the burden structure after magnesium transfer was significantly increased,the softening range became narrower,the dripping mass increased significantly after 5 minutes,and the total characteristic value(S)decreased.After the successful apply of the process,the coke ratio of the blast furnace was reduced from 380 kg/t to 370 kg/t,the coal ratio was increased from 135 kg/t iron to 145 kg/t iron,and the utilization coefficient of 2000m3 blast furnace reached 2.9 t/m3·d.
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