Abstract: Using sinters with different MgO contents as raw material， the effects of MgO content and nut coke mixed charging on the melting temperature， melting zone and maximum pressure drop of sinter bed were investigated， and the change of melting temperature was analyzed. The experimental results show that， when MgO mass fraction in sinter increases from 1.3% to 2.0%， the starting melting temperature (t_○S) changes slightly， the dripping temperature (t_○D) increases， the melting zone (t_○D-t_○S) increases from 156℃ to 207℃， and the maximum pressure drop increases from 10kPa to 11kPa. When sinter with w(MgO)=2.0% is mixed with nut coke， t_○S increases from 1312℃ to 1324℃， t_○D decreases from 1519℃ to 1480℃， melting zone (t_○D-t_○S) decreases from 207℃ to 156℃， and the maximum pressure drop decreases from 11kPa to 7kPa， showing that the mixed charging of sinter with nut coke can improve the melting-dripping property of burden.

Key words: sinter, MgO, nut coke mixed charging, melting-dripping property, pressure drop