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 °C 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.