Affiliation:
1. Institute for Carbon Neutrality University of Science and Technology Beijing Beijing 100083 China
2. School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China
3. Steelmaking Department Shougang Jingtang United Iron and Steel Co., Ltd. Tangshan 063200 China
Abstract
In steelmaking, the bottom‐blown O2‐CaO process is used to achieve efficient dephosphorization. However, few studies have applied it to dephosphorization converters. Therefore, this study considers the thermodynamic and kinetic mechanisms of dephosphorization during the process. The selective oxidation transfer temperatures of C and P are calculated. Compared to the combined blowing process, the bottom‐blown O2‐CaO process reduces the optimum dephosphorization temperature from 1593 to 1573 K. Moreover, the FeO content decreases by 20.7% owing to the increased stirring energy and improved kinetic conditions; the binary basicity (R) of the slag increases, and the lime consumption decreases by 2.9 kg t−1. The higher slagging efficiency indicates that the CaO powder melts and dephosphorization is completed during the fire‐spot zone floating process. Furthermore, the optimum FeO content for dephosphorization decreases as R increases. The selective oxidation of C and P can be divided into two stages. The oxidation stage of P preferred C is extended in this process. Overall, the end‐point P content accounts for 22.52% and 46.85% of the samples prepared using the combined blowing and bottom‐blown O2‐CaO processes when the P content is 0.02–0.03%, respectively.
Funder
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Subject
Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics