NEW TRENDS IN BASIC OXYGEN FURNACE DEPHOSPHORIZATION

  • Ender Keskinkilic Atilim University, Department of Metallurgy and Material Engineering, Ankara, Turkey
Keywords: double-slag, steelmaking, phosphorus, dephosphorization,

Abstract


Except for special grades of steel where it is used as an alloying element, phosphorus is regarded as an impurity that must be removed. Considering the conventional integrated iron and steelmaking, there are primarily two processes for phosphorus removal. The first is a hot metal dephosphorization (DeP) process that is applied to a blast furnace for hot metal before the steelmaking process. The second is the basic oxygen furnace steelmaking (BOS), a unique method primarily used for steelmaking, with the exception of stainless steels. Hot metal phosphorus content has a direct impact on BOS. An increase of phosphorus in hot metal is mainly related to the use of high P2O5 containing iron ores. In the current literature review, new trends of phosphorus removal in converter steelmaking are outlined. The double-slag practice was reported to be successful when hot metal P content was larger than 0.100%. It was indicated that the tapping temperature was critical for the production of low-phosphorus grades for which maximum allowable P content was 0.007% and that high tapping temperatures should be avoided. The tap-to-tap time for the double-slag process was slightly longer than the conventional converter steelmaking. It was further reported that the double-slag practice would be more economical than an establishment of a separate hot metal dephosphorization unit, if low-phosphorus grades did not have a significant share in the product mix of a steelmaking company. End-point phosphorus prediction was one of the important recent trends of converter steelmaking. A mixed injection of CO2-O2 to a basic oxygen furnace was applied to enhance dephosphorization, and promising results were reported. Unfortunately, a successful process for recycling of BOS dephosphorization slag has not been reported yet.

Author Biography

Ender Keskinkilic, Atilim University, Department of Metallurgy and Material Engineering, Ankara, Turkey

Ender Keskinkilic earned his undergraduate degree from the Department of Metallurgical and Materials Engineering of Middle East Technical University (METU), Ankara (the capital city of Turkey) in 1999. He continued M.S. and Ph.D. studies in the same department. He worked as a research assistant in METU between 1999 and 2003. After receiving the master’s degree in 2001, he progressed further in the field of extractive metallurgy. During the Ph.D. period, he moved to Eregli-Zonguldak in 2003 and he worked in Quality Metallurgy & RD Department of Eregli Iron and Steel Works Co. (ERDEMIR), which is the leading steel company in Turkey regarding the qualities produced and the production capacity. After earning his Ph.D. degree in 2007, he returned to university and to work in the Department of Metallurgical and Materials Engineering of Atilim University, Ankara, in 2008. He has been working as a faculty in Atilim since then. He was assistant professor between 2009 and 2014. He has been working as an associate professor since 2014. His primary field of interest is extractive metallurgy and more specifically pyrometallurgical processes such as iron- and steelmaking, ladle metallurgy, ferroalloy production, and nonferrous extractive metallurgy. He has been acting as the chairman of the Department of Metallurgical and Materials Engineering of Atilim University since July 2018.

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Published
2020/02/19
How to Cite
Keskinkilic, E. (2020). NEW TRENDS IN BASIC OXYGEN FURNACE DEPHOSPHORIZATION. Journal of Mining and Metallurgy, Section B: Metallurgy, 56(1), 1-10. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/21549
Issue
Vol. 56 No. 1 (2020)
Section
Review Paper

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