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| Effect of scrap on bath mixing for a BOF converter |
| 1,Shi-Heng PENG |
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Abstract Recently, many steel mills have made efforts to increase the scrap ratio in order to reduce production costs. Consequently, it is particularly important to study the effect of scrap on the bath of the converter. This paper focus on the effect of scrap on the stirring of the bath in the initial blow process of the converter. The influence of scrap volume and distribution on the bath stirring were investigated by applying a physical model based on a 250 t converter. It was found that the mixing time gradually decreases when the gas flowrate is increased during the bottom blowing process. When the scrap is uniformed distributed, the mixing time is much less than that of the centralized distribution of the scrap. When the light scrap is added into the bath, the mixing time of the bath decreases when the gas flowrate increases. Moreover, the mixing time is an increasing function of the scrap volume. Remarkably, when the volume of heavy scrap increases to 50 tons, the trend of mixing time changed reversely, namely, the mixing time is decreased compared with that when the scrap amount increased from 10 t to 25 t.
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Received: 18 October 2018
Published: 17 April 2020
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2019, Vol. 38 