Application of low alkali metal bentonite in pellet production
Reducing the content of alkali metal in pellet is beneficial to reduce the alkali load of blast furnace.There-fore,the application of two kinds of low alkali metal bentonite in pellet production was studied.The results show that under the same ratio,the drop strength(0.5 m)of green pellet using these two kinds of low alkali metal ben-tonite increases from 5.0 times to 5.2 times and 8.8 times,respectively.The mass fraction of alkali metal decreases from 0.203％to 0.142％and 0.146％,respectively.The reduction swelling index decreases from 13.8％to 11.9％and 12.7％,respectively.The low temperature reduction degradation indexes IRD,＞6.3mm,IRD,＞3.15 mm and IRD,＞o.5 mm have a good trend.One of the low alkali metal bentonites was used in the pellet production of a steel plant.The re-sults show that the alkali metal mass fraction of pellet with low alkali metal bentonite decreases by 0.055 percent point while the compressive strength changes little,and the reduction swelling index has a decreasing trend.The ap-plication of low alkali metal bentonite in pellet production is beneficial to reduce the content of alkali metal in pellet,which has a positive effect on the normal smelting of blast furnace and the long life of blast furnace.
low alkali metal bentonitealkali metalreduction swelling indexlow temperature reduction degrada-tionmicrostructure
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