Study on Inclusion Removal in Molten Steel by Soluble Gas Flotation Technology

内容简介

This book established a thermodynamic model of bubble convex spherical nucleation and a dynamic model of bubble rising and growing during vacuum treatment of liquid steel/(N2,H2) saturated system. The influence of different factors on bubble convex spherical nucleation,growth and rising of bubbles were deeply studied,and the mechanism of inclusions removal in steel was revealed by soluble gas flotation technology. The removal of inclusions from Si-Mn deoxidized steel by soluble gas flotation technology has been investigated by laboratory experiments. Industrial trials were carried out to explore the removal effect of the inclusions by the new technology. The experimental platform of the RH water model has been constructed to study the effects and mechanisms of the application of the technique in RH refinement. The mechanisms and application implications of this technique have been explored in depth.

目录

Chapter 1 General Introduction

1.1 Techniques for Removal of Nonmetallic Inclusions from Steel

1.2 Mechanism of Bubble Removal of Inclusions

1.3 Study of Bubble Nucleation

1.4 Study of Bubble Growth

1.5 The Influence of Different Factors on the Removal of Inclusions by Bubbles

1.6 The Research Significance and Content of this Book

References

Chapter 2 Theoretical Analysis of Bubbles Nucleating on Surfaces of Convex Spherical Inclusions in Molten Steel During Vacuum Treatment

2.1 Introduction

2.2 Experimental

2.3 Modeling on Thermodynamics of Bubbles Nucleating on Convex Spherical Inclusions

2.4 Results and Discussion

2.5 Conclusions

References

Chapter 3 Bubble Growth and Floating Behavior during Degassing Process of Molten Steel/(N₂,H₂)System

3.1 Introduction

3.2 Modeling on Kinetics of Bubble Growth and Floating Behavior in Steel/(N₂,H₂)System

3.3 Water Model Experiment

3.4 Discussion

3.5 Conclusions

References

Chapter 4 Study on Removal of Inclusions from Silicon Manganese Deoxidized Steel by Nitrogen Addition and Nitrogen Evolution

4.1 Introduction

4.2 Experiment

4.3 Experimental Results

4.4 Discussion

4.5 Conclusions

References

Chapter 5 The Mechanism of Inclusion Removal from Molten Steel by Dissolved Gas Flotation

5.1 Introduction

5.2 Experimental

5.3 Results and Discussion

5.4 Conclusions

References

Chapter 6 Production of Clean Steel Using the Soluble Gas Flotation Method

6.1 Introduction

6.2 Industrial Experiments

6.3 Results

6.4 Discussion

6.5 Conclusions

References

Chapter 7 The Effects of Soluble Gas Flotation Technology on the Flow Field of Ladle and Inclusion Removal in RH Refine Process

7.1 Introduction

7.2 Experimental

7.3 Results and Discussion

7.4 Conclusions

References

Chapter 8 Water Model Study of the Removal Effect of Soluble Gas Flotation Technology on Inclusions with Different Characteristics

8.1 Introduction

8.2 Experimental

8.3 Results and Discussion

8.4 Conclusions

References

List of Symbols

List of Figures

List of Tables

Acknowledgements