Effect of Special Components in Blast Furnace Slag of Baotou Iron and Steel Company on Self-pulverization Behavior of Steel Slags
This is an article in the field of metallurgical engineering,which proposed a new idea of mixing molten blast furnace slag with steel slag to achieve self-pulverization of steel slag,and systematically studied the influence mechanism of special components of CaF2 and CeO2 in blast furnace slag of Baotou Iron and Steel Company on the self-pulverization of steel slags.Using analytically pure CaO,SiO2,CaF2 and CeO2 as starting materials,pure C2S specimens were prepared with n(CaO)∶n(SiO2)=2∶1,then different mass fractions of CaF2 and CeO2 were added,respectively.The effect of CaF2 and CeO2 on the self-pulverization behavior of C2S was investigated by calcining the specimen at 1 450 ℃ for 1 h and cooling with the furnace.The results showed when CaF2 was incorporated into C2S and the content of CaF2 was less than 2.5％,it had little effect on the self-pulverization of C2S.However,when the content of CaF2 was more than 2.5％,the specimen had different degrees of agglomeration,which affected the self-pulverization of C2S.Considering that excessive CaF2 would affect the environment,the content of CaF2 should be controlled below 2.5％.When CeO2 incorporated into C2S and the content was 0.25％,C2S could still be completely self-pulverized,but when the CeO2 content was more than 0.5％,C2S no longer self-pulverized.Therefore,the CeO2 content must be less than 0.25％,and the self-pulverization effect of C2S was relatively good.
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