Про механізм окислення домішок металевого розплаву при виплавці конвертерної сталі в великовантажних конвертерах

• Datum: 2023
• Hauptverfasser: Мельник, С.Г., Бондар, В.І.
• Format: Artikel
• Sprache: Ukrainisch
• Veröffentlicht: Physico-technological Institute of Metals and Alloys 2023
• Schlagworte: конвертерна сталь; зневуглецювання; штучний інтелект; кінетика і механізм процесу; математична обробка; критична концентрація; автоматизована система управління
• Online Zugang: https://www.metalsandcasting.com/index.php/mcu/article/view/116
• Назва журналу: Metal and Casting of Ukraine

The article discusses the features of the steel decarburization process in heavy-duty 300-ton converters using the combined blow-off technology. Using the example of the process of carbon oxidation, using the provisions of the macroscopic kinetics of chemical reactions, it is shown that the application of the theory of critical concentrations by Prof. S.I. Filippov makes it possible to obtain mathematical dependences of the experimental carbon content in steel, depending on the calculated one in the process of purging the melt with technically pure oxygen and argon. It was noted that the processing of data on the change in carbon concentration in the process of purging steel in the converter, including the results of measurements of CO and CO2 in the gas phase at Krupp-Stahl, made it possible to graphically obtain the critical carbon concentration [C]cr ≈ 0.1 %. Statistical processing of the data allowed us to obtain the dependences of the comparison of the experimental [C]res and the calculated [C]calc content of carbon during conversion for: the conditions of the external diffusion regime for limiting the process of carbon oxidationat [C] > [C]cr; [C]res = 0.929 ∙ [C]calc + 0.019; the conditions of the external diffusion regime for limiting the process of carbon oxidation at [C] < [C]cr; [C]res = 0.20 ∙ [C]calc + 0.063. The use of macroscopic kinetics in the analysis of data on the oxidation of carbon in a metal melt by purging with technically pure oxygen assists metallurgists in choosing the most accurate technological option for steelmaking in heavy converters. The obtained and presented data can be used to develop algorithms for programs of automated control systems for converter smelting while taking into account the need to prepare charge materials of the required quality, primarily their fractional composition. The proposed methodology for the study of the oxidation of impurities of metal melts under oxidizing conditions of converter smelting, taking into account the requirements of macroscopic kinetics, including the provisions of the theory of critical concentrations, will improve the quality of smelted steel for domestic and world markets of metal products.