High iron and low
silica sinter is a quality feed to enhance the ironmaking in blast furnace. However, the sinter strength deteriorates with an increase in iron grade and a decrease in silica content. In this paper,a study of fabrication of high iron and low silica sinter containing 58.5%～60.5% TFe and 3.8%～4.5% silica content was conducted at 700 mm～800 mm bed
height and with the addition of
serpentine in the sinter mix, which included the effect of process factors on strength and productivity of finished sinter,sinter mineralogy and metallurgical properties.The base case
sintering experiment was performed under the conditions of 600 mm bed height and without proportioning of serpentine in the sinter mix.It was shown that high bed sintering is of importance to enhance strength and productivity of sinter and reduce
coke consumption. Compared with the results of bass case,TI and coke consumption are increased by 2.26%and decreased by 3.12 kg/t respectively at bed 750?mmbed height and without adding serpentine.However,TI and coke consumption are increased by 4.45% and decreased by 3.59 kg/t respectively at 750?mm bed height and with adding 1.3% serpentine in sinter mix compared with that of base case. The mechanism is demonstrated that oxygen potential of bed increases and the induration time of minerals at high temperature zone extends during high bed sintering with less coke content proportioned,resulting in 2.3%～3.3% and 1.89%～2.33%increases in
calcium ferrite content and reducibility index,respectively.
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