Influence of copper content in steel on the rate of copper removal by evaporation

• Autorzy: Łabaj J. , Lipart J.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The paper provides an analysis of the results of studies upon the rate of copper evaporation from liquid Fe-Cu alloys. 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. Due to the fact that the alloy composition may affect all the constituent stages of the evaporation process, the analysis undertaken concerned both the mass penetration process occurring in the liquid phase and the evaporation reaction taking place on the interface. Design/methodology/approach: The studies of the copper evaporation from liquid steel 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 at the temperature of 1998 K. The copper content in the alloys examined varied from 0.198 to 1.518% by weight. Findings: The overall mass transfer coefficients established based on the study results assumed values within the range from 4.2 10⁻⁵ to 4.8 10⁻⁵ ms⁻¹ for the tests conducted under the pressure of 0.06 Pa and from 8.3 10⁻⁶ to 1.0 10⁻⁵ ms⁻¹. for those conducted under the pressure of 101 Pa. Practical implications: The main point of the EAF process is a transfer of the scrap components to the steel being melted. Some metals introduced into the bath together with the scrap may exert a negative impact on its properties. An example of such a contaminant may be copper. This metal is characterised by limited solubility in iron and it is released on grain boundaries at temperatures of hot processing. Originality/value: The studies conducted proved that, for the pressure of 0.06 Pa, the overall mass transfer coefficient value on the copper content in the alloy increased from 0.198 to 1.518 % by weight grows by ca. 15 %. This growth is caused by numerous factors including the increase in the value of the copper activity coefficient in liquid iron.

Słowa kluczowe

EN

scrap; copper; steel; evaporation; vacuum refining; mass transfer

PL

złom; miedź; stal; odparowanie; rafinacja próżniowa; wymiana masy

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2011
• Tom: Vol. 52, nr 1
• Strony: 13--17
• Opis fizyczny: Bibliogr. 11 poz.

Twórcy

autor

Łabaj J.

autor

Lipart J.

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

Bibliografia

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