Pelletizing characteristics of PFC1 concentrate in different pelletizing processes
The lack of high-quality iron ore is one of the key problems restricting the"sintering to pelletizing",in-creasing the proportion of pellets in the blast furnace and promoting carbon emission reduction before the blast fur-nace ironmaking.Therefore,it is of great significance to broaden the source of pelletizing materials.The basic prop-erties and mineralogical characteristics of Brazilian hematite concentrate(PFC1)were studied,and it revealed effects on pelletizing performance,firing characteristics and high-temperature metallurgical performance of mixed concen-trate when the proportion of PFC1 was changed in the two typical ore blending structures of grate-kiln process mainly magnetite and straight grate process mainly hematite.The results show that in the grate-kiln process of mainly magnetite(70％-100％magnetite)ore composition,replacing the magnetite concentrate with 10％PFC1 can improve the pelletizing properties of the mixed concentrate,the fired pellets with good mechanical strength can be prepared,and the high-temperature metallurgical performance including reduction degree index and reduction expan-sion index are also improved.In the straight grate process of mainly hematite(40％-75％hematite)ore composi-tion,when 10％-20％PFC1 is adding,the thermal stability of mixed concentrate green pellets is improved,the strength of the green pellets is good,the firing characteristics and reduction swelling index of pellet are improved,however,it has some adverse effects on reduction degree index and low temperature reduction degradation index of pellets,but all of the indexes can still meet the requirements of furnace.The proportion of magnetite and hematite replaced by PFC1 can reach 10％-20％for the grate-kiln process and straight grate process,and the performance of the prepared pellets is good meanwhile.The results provide important reference and guidance for expanding the raw material source of pelletizing and guiding the application of PFC1 hematite.
hematiteoxidized pelletfiring characteristicsgrate-kiln processstraight grate process
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