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2023 | Buch

Theory and Practice of CO2 Utilization in Steelmaking

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This book analyzes the mechanism of the application of CO2 in steelmaking, by looking at the thermodynamics and kinetics of the reactions of CO2 with the elements present in molten steel. This book is the first academic monograph either at home or abroad on the application of CO2 in the steelmaking field. The thermodynamic conditions of the reactions of CO2 with silicon, manganese, phosphorus, chromium, nickel, vanadium, and other elements were calculated and analyzed using the FactSage thermodynamic software, and the selective oxidation law of the above multiple elements by CO2 was also analyzed. In terms of kinetics, the interfacial reaction mechanism of CO2 was analyzed via gas isotope exchange technology, and the O2 transfer process and transfer rate between the CO2, slag, and steel were studied. In terms of materials and energy balance, how to use the high-temperature characteristics of CO2 to control the temperature of the molten pool, improve the reaction conditions of molten iron, reduce the evaporation of molten iron, and reduce the amount of steelmaking dust were introduced. Based on the experimental data, theoretical models of unit operation for the application of CO2 in steelmaking were established, including decarburization, denitrification, dephosphorization, decarburization and chromium retention, vanadium extraction, and carbon preservation, and these theoretical models were applied to the steelmaking production process, which is an important step in going from theory to practice. The above research work has opened up a new solution for energy saving and liquid steel cleaning in the iron and steel production process and represents progress in steelmaking technology.

This book is used as a reference book for managers, engineering and technical personnel, and related professional teachers and students of Iron & Steel enterprises, government departments, consulting services and evaluation agencies, colleges, and secondary professional schools.

Inhaltsverzeichnis

Frontmatter
Chapter 1. Introduction
Abstract
This chapter introduces the status quo in terms of carbon dioxide (CO2) emissions, CO2 recovery technology, and its research status and development in converters, electric arc furnaces (EAF), and refining.
Rong Zhu
Chapter 2. The Thermodynamics of CO2 in the Steelmaking Process
Abstract
The overall steelmaking process includes decarbonization, dephosphorization, desulfurization, denitrification, dehydrogenation, and other steps. In light of experimental results, this chapter describes the chemical reaction and metallurgical effect of the use of CO2 in steelmaking, and thermodynamic analysis is conducted.
Rong Zhu
Chapter 3. The Kinetics of Using CO2 in Steelmaking
Abstract
In this chapter, the kinetics of decarbonization and denitrification of CO2 steelmaking are studied, the effects that the rate of CO2 utilization and the ratio of injection and blowing have on the decarbonization and denitrification processes of steelmaking.
Rong Zhu
Chapter 4. Materials and Heat Balance of the CO2 Used in Steelmaking
Abstract
The steelmaking process follows the laws of the conservation of energy and mass. Through the establishment of materials and heat balance calculations in the steelmaking process, it is possible to fully grasp the utilization of materials and energy in the converter, provide a basis for optimizing the process and achieving the best operation, providing effective methods for reducing raw materials consumption and the rational use of energy.
Rong Zhu
Chapter 5. Basic Theory of CO2 Use in Refining
Abstract
This chapter describes the influence that carbon dioxide (CO2) gas introduced into a ladle refining furnace (LF), argon (Ar)–oxygen (O2) decarburization (AOD), and Rheinsahl–Heraeus (RH) process has on various refining effects. At the same time, the reaction mechanism of CO2 as refining stirring gas in molten steel is described, and the thermodynamic and kinetic models of refining CO2 reaction are established.
Rong Zhu
Chapter 6. The Theory of Limestone Decomposing CO2 Steelmaking
Abstract
Limestone can decompose carbon dioxide (CO2) gas at the steelmaking temperature, so its use in steelmaking and slagging can indirectly aid CO2 steelmaking.
Rong Zhu
Chapter 7. Study on the Decarburization and Chromium (Cr) Yield of a Chromium-Containing Melt by CO2
Abstract
Similar to oxygen (O2), carbon dioxide (CO2) can react with carbon in both molten stainless steel (a Fe–Cr–C system) in which the major constituent is iron (Fe), and a Cr-based Fe–Cr alloy melt (a Cr–Fe–C system) to complete the smelting tasks of decarburization and Cr retention. In this chapter, the thermodynamic and kinetic behaviors of the reaction that CO2 undergoes with stainless steel, Fe–Cr, and Fe–Mn melts are investigated.
Rong Zhu
Chapter 8. Application of CO2 Injection in the Steelmaking Process
Abstract
Through the theoretical research that has been carried out on the application of carbon dioxide (CO2) in the field of steelmaking, it has been found that CO2 gas can be used as a coolant, stirring gas, and oxidizing gas in steelmaking or refining. By studying the recycling of CO2 in steelmaking, a large amount of field data has been obtained. The industrial processing of CO2 resource utilization in the steelmaking field will be introduced.
Rong Zhu
Metadaten
Titel
Theory and Practice of CO2 Utilization in Steelmaking
verfasst von
Rong Zhu
Copyright-Jahr
2023
Verlag
Springer Nature Singapore
Electronic ISBN
978-981-19-2545-0
Print ISBN
978-981-19-2544-3
DOI
https://doi.org/10.1007/978-981-19-2545-0