| Title | A way to use ladle slag to partially replace lime in BOF |
|---|---|
| ID_Doc | 13860 |
| Authors | Pathak, RK; Gollapalli, V; Rao, MVM; Guttula, BK; Jee, S; Bhaskar, K; Soumya, VS |
| Title | A way to use ladle slag to partially replace lime in BOF |
| Year | 2022 |
| Published | |
| Abstract | With the requirements of sustainable development and to adopt principles of circular economy in steel industry, slag utilization has become a hot issue. As a consequence, 3R (Reduce, Reuse and Recycle) technique of waste handling has become most popular among the industries. This paper focuses on recycling of Ladle Slag (LS) generated after secondary refining process in BOF. Industrial trials were conducted with varying amount of recycled LS to the BOF at Visakhapatnam Steel Plant (VSP), India. The effect of LS addition on steel refining was also studied by taking intermediate steel and slag samples at different stages of refining namely, 1st, 2nd/middle and end of blow (EOB). It was observed from the trials that LS addition helps in early slag formation due to its low melting point which was confirmed by measuring in Ash Fusion equipment. Basicity and phosphate capacity of slag collected at different stages of refining was compared with and without LS addition. High basicity of slag was observed in the early stages of blow which further confirms that it helps in early slag formation. Phosphate capacity of BOF slag was calculated and found that it was better than without LS addition. Effect of LS addition on the FeO generation in the BOF slag was also studied and it was found that, particularly in first and middle stage of blow FeO generation was higher. However, FeO level was lower in the EOB stage which confirms that it has no negative effect on BOF lining. Finally, it can be concluded that addition of LS in BOF has no negative effect on steel refining and 1t of lime can easily be saved with 2t of LS addition. |
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