618-0808/01 – Electrometallurgy and Secondary Metallurgy (ELMaSM)
| Gurantor department | Department of Metallurgy and Foundry | Credits | 5 |
| Subject guarantor | prof. Ing. Karel Michalek, CSc. | Subject version guarantor | prof. Ing. Karel Michalek, CSc. |
| Study level | undergraduate or graduate | Requirement | Choice-compulsory |
| Year | 2 | Semester | winter |
| | Study language | Czech |
| Year of introduction | 2004/2005 | Year of cancellation | 2015/2016 |
| Intended for the faculties | FMT | Intended for study types | Follow-up Master |
Subject aims expressed by acquired skills and competences
- student will be able to characterise steelmaking technology in electric furnaces and steel treatment by the help of secondary metallurgy
- student will be able to formulate basic physical chemical processes at steelmaking in electric furnaces and at steel treatment by the help of secondary metallurgy
- student will be able to describe power characteristics of arcs, regulation of electrodes, work of direct-current EAF, flexible processes in electrometallurgy and methods of secondary metallurgy
Teaching methods
Lectures
Seminars
Tutorials
Summary
The subject is focused on theoretical and practical aspects of steel
production in the electric furnaces. The attention is devoted to AC and DC arc
furnaces, induction furnaces, hybrid and flexible units and other innovative
trends in the field of electrometallurgy. The fundamentals of secondary metallurgy production is presented here.
Compulsory literature:
Recommended literature:
Articles in professional journals, papers of conferences, research reports, theses.
Way of continuous check of knowledge in the course of semester
Two scored semester works and its presentation in relevant seminars during exercises.
Two scored progress tests.
E-learning
Only study support in Czech language is available now: http://www.fmmi.vsb.cz/cs/okruhy/studium-a-vyuka/podklady-ke-studiu
For electronic communication with the teachers enjoy the university e-mail addresses those can be found here: http://staff.vsb.cz/
Integration of e-learning elements into the subject is in progress.
Other requirements
There are not additional requirements on students in the field of this subject.
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
1.Present state and perspectives of production of steel in electric furnaces. Classification of electric furnaces. Fundamentals of heavy electrical alternating current.
2.Theory of arc. DC electric arc. AC electric arc.
Stabilization of arc burning.
3. Electrical and heat work regime of elektric arc furnaces (EAF). Working electrical characteristics.
EAF. Dynamical, physical and chemical effects of the arches. UHP and SUHP furnaces.
4.Other heat sources in the EAF. Intensification of production in EAF. The use of gaseous oxygen. Oxyfuel burners. Foaming nozzle. Bottom blowing of inert gas into bath. EAF productvity.
5.Basic construction of EAF. EAF transformers, reactors, compensation power factor. EAF secondary electrical circuit. Graphite electrodes. Production of electrodes.
6.Regulation of the electrodes. Static and dynamic characteristics of the electrodes controller. Block diagram of the controller. Induction stirring in the bath EAF. Lining of EAF. Water EAF cooling. Suction gas furnace, gas cleaning.
7.Technologies EAF steel production. Two-slags technology. One-slags technology. The importance of oxidation and reduction period. Technology of overmelting.
8.Production of alloy and high alloy steel. Thermodynamics of metallurgical processes at oxygen rafination of melt. Dephosphorization of high alloy melt. Oxide alloy reduction from slags into melt. Alloying by titanium. Production of steel in acid EAF.
9. Combined steelmaking processes. EAF – DH, EAF-VOD. EAF - AOD. Hydrogen and nitrogen behaviour during the melting in the EAF. Molten steel temperature measuring. Determination of oxygen activity, hydrogen and nitrogen content in the bath. Automatization of production control in EAF.
10.Direct current (DC) EAF. Particularities and differences of the furnace design. Bottom anode. Heat procedure in DC EAF. Advantages of DC EAF furnaces and
comparison with AC EAF.
11. New processes in the production of steel in EAF - Fuchs Shaft Furnace, Verticon, ConSteel, Comelt-VAI ContiArc.
12. New processes in the production of steel in EAF - CONARC, Arcon, Contimet, KES, Danarc.
13. Production of steel in induction furnaces. The principle of heating and melting. Construction of induction furnaces. Basic characteristics of electric induction furnaces. Steel production technology in induction furnaces. Vacuum induction furnace.Metallurgical processes taking place in a vacuum. Electroslag remelting.
14. Treatment of molten steel by means of secondary metallurgy. Homogenization of steel by blowing of argon, ladle furnace, vakuum metalurgy.
Practice (only for full-time study form):
1. Excursion in the laboratories of the Department of Metallurgy - induction furnaces, resistance furnaces. Scientific research activities of the department.
2. Fundamentals of Power Electrical AC - calculation of phase
delay, resonance, AC power and three phase power
AC.
3 Calculations of electrical characteristics of the EAF.
4 Control electrodes EOP - video program, seminar.
5 Checking results of computer processing of electrical characteristics.
Calculation of equilibrium concentration C in iron melts. Equilibrium levels
oxygen in high-iron melts. Distribution of tasks for the seminar.
6 Seminar - selected issues of electrical metallurgical plant building. Individual treatment and presentations.
7 Monitoring of the EAF heat in VITKOVICE, Inc.
8 Monitoring of the EAF heat in VITKOVICE, Inc.
9 Course of EAF heat - video program, seminar.
10 Study of professional journal - selection and processing of the current literary resources of electrical metallurgical field.
11 Seminar - presentation of the results of literary study.
12 Monitoring of the EAF heat in TZ, Inc.
13 Monitoring of the EAF heat in TZ, Inc.
14 Computational exercises - arc furnace production capacity, factors affecting the production capacity.
15 Delivery of processed logs. The granting of credits.
To obtain credit in the combined study form is needed to develop a session project.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction
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