Temperature impact on copper evaporation from liquid iron

• Autorzy: Blacha, L. , Łabaj, J.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The purpose of the studies the results of which are being discussed was to determine the temperature impact on the rate of copper removal from liquid steel under the conditions of reduced pressure. In the present article, the authors have provided the activation energy values established for the process studied which enabled them to find out which of the constituent stages of the copper evaporation process is the determinant one. Design/methodology/approach: The studies of the copper evaporation from liquid iron were conducted using an induction furnace. Based on the results obtained for the change in the copper concentration in liquid bath, the value of the overall copper mass transfer coefficient was estimated. The studies were conducted under the pressures of 0.06 Pa and 101 Pa respectively within the range of temperatures of 1923-1998 K. Findings: The activation energy values estimated based on the mass transfer coefficient values established came to 52 kJmol-1 and 154 kJmol-1 for the pressures of 0.06 Pa and 101 Pa correspondingly. The values obtained for a pressure below 2 Pa were of the same order of magnitude as the activation energy values established for diffusion in liquid metal alloys based on experimental data. Practical implications: Increasing the share of demolition scrap in the charge material for steel smelting by application of the EAF process creates a hazard of the liquid metal contamination with copper. The results obtained may provide to introduce corrections into the process parameters in order to intensify the copper removal process. Originality/value: The literature of the subject lacks discussion of the results of kinetic studies of copper evaporation from liquid steel under the conditions of reduced pressure from the perspective of the temperature impact on this process. The analysis undertaken in the study in question implied that, at low pressures, the copper evaporation process is determined by the phenomenon of mass transfer in the liquid phase.

Słowa kluczowe

PL

miedź; stal; parowanie; złom; rafinacja

EN

copper; steel; evaporation; scrap; refining

• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2011
• Tom: Vol. 51, nr 2
• Strony: 103-106
• Opis fizyczny: Bibliogr. 10 poz.

Twórcy

autor

Blacha, L.

autor

Łabaj, J.

• Faculty of Materials Engineering and Metallurgy, Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, Poland,

Bibliografia

• [1] J. Łabaj, B. Oleksiak, G. Siwiec, Study of cooper removal from liqud iron, Metalurgija 50 (2011) 265-268.
• [2] M. Olette, Vacuum distillatIon of minor elements from liquid ferrous, Physical Chemistry of Process Metallurgy 8 (1961) 1065-1087.
• [3] R. Harris, R. Li, Vacuum refining metallurgical melts, EPD Congress TMS, 1991.
• [4] R. Ward, Journal of the Iron and Steel Institute 201 (1963) 920-923.
• [5] L. Savov, D. Janke, Evaporation of Cu and Sn from induction-stirred iron-based melts treated at reduced pressure, ISIJ International 40 (2000) 95-104.
• [6] L. Blacha, Bleientfernung aus kupferlegierungen im prozess der vakuumraffination, Archives of Metallurgy 1 (2003) 105-127.
• [7] T. Yamamura, T. Ejima, Diffusion of monovalent solutes in liquid copper and silver, Journal of the Japan Institute of Metals 37 (1973) 901-906.
• [8] M. Kawakami, et all., Effect of aluminum and oxygen content on diffusivity of aluminum in molten iron, ISIJ International 37 (1997) 425-431.
• [9] Y. Ono, S. Matsumoto, Diffusion of chromium, manganese, and nickel in molten iron, Journal of the Japan Institute of Metals 16 (1975) 415-422.
• [10] Y. Ono, T. Shigematsu, Diffusion of vanadium, cobalt, and molybdenum in molten iron, Journal of the Japan Institute of Metals 41 (1977) 62-68.