Effect of Melting and Refining with DC-Arc on the Yield of Alloy Element

Abstract:

In order to know what effect on the yield of alloy elements will be if the steel is melted/refined with the DC arc furnace, the effect of melting and refining with DC-arc on the yield of alloy element has been investigated by a melting experiment, in which the melting/refining is switched to continuous melting/refining with DC-arc after the molten metal is contact with the molten slag for 41 minutes without DC-arc, and by a contrast experiment of melting/refining with DC-arc and with an AC-arc. When DC current passes through the slag-metal interface and the slag-gas interface, the existence of the electrolysis phenomenon during the DC-arc steel melting/refining has been confirmed. Electrolysis participates in the metallurgical reaction. The phenomenon of two or more electrode reactions taking place simultaneously at both the slag-metal interface and the slag-gas interface has also been observed. The two phenomena cause the accelerating loss of the alloy-elements in the molten metal and the decreasing of concentrations of the corresponding oxides in the molten slag. The electrochemical transfer of oxygen from the molten slag to the molten metal ((O^2-)=[+2e and (O^2-)=1/2O₂+2e) at the slag-metal interface has been observed, and causes the increasing of oxygen content in the molten metal.

• Periodical: Advanced Materials Research (Volume 803)
• Pages: 200-204
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.803.200
• Online since: September 2013
• Authors: Jian Bin Chen, Mao Fa Jiang
• Keywords: DC Electric Arc Furnace, Electrolysis, Melting, Refining, Simultaneous Reaction, Slag-Metal Reaction

References

[1] O. Grässel, L. Krüger b, G. Frommeyer, et al., High strength Fe-Mn-(Al, Si) TRIP/TWIP steels development – properties – application, International Journal of Plasticity. 16(2000) 1391-1409.

DOI: 10.1016/s0749-6419(00)00015-2

[2] G. Frommeyer, U. Brüx, P. Neumann, Supra-ductile and high-strength manganese–TRIP/ TWIP steels for high energy absorption purposes, ISIJ Inter. 43(2003) 438-446.

DOI: 10.2355/isijinternational.43.438

[3] B.C. De Cooman, O. Kwon, K. -G. Chin, State-of-the-knowledge on TWIP steel, Materials science and technology. 28(2012) 513-527.

DOI: 10.1179/1743284711y.0000000095

[4] Y. Sutou, N. Kamiya and R. Umino, High-strength Fe-20Mn-Al-C-based alloys with low density, ISIJ Inter. 50(2010) 893-899.

DOI: 10.2355/isijinternational.50.893

[5] J-B Chen, Z-T Wu, M-F Jiang, The Metallurgical reaction characteristic during DC arc steelmaking process, Shanghai Metals. 21(1999) 21-25 (in Chinese).

[6] N. Toshio, Y. Hironobu, Arc Phenomenon in DC Arc Furnace (7), Kougyou　Kanetsu. 29(1992) 25-41 (in Japanese).

[7] E. R. Wunsche, R. Simcoe, Electric arc furnace steelmaking with quasi-submerged arcs and foamy slags, Iron and Steel Engineer. 61(1984) 35-42.

[8] K. S. Goto, A review of the electrolytic properties of metallurgical slags, Proc. 2nd Int. symp. Metal. slags fluxes, AIME, Lake Tahoe, 1984, pp.839-859.

[9] S. Ramachandran, T. B. King, N. J. Grant, Rate and mechanism of the sulfur transfer reactions, Trans. AIME. 206(1956), 1549-1553.

[10] W-K Lu, I. Jim, On the kinetics of coupled sulfur and oxygen transfer through an ionic diaphragm, Metall. Mater. Trans. B. 1(1970) 267-70.

DOI: 10.1007/bf02819270

[11] R.G. Ward, K.A. Salmon, The kinetics of sulphur transfer from iron to slag, J. Iron Steel Inst. 201(1963) 222-227.

[12] F.L. Kemeny, I.D. Sommerville, A. Mclean, Electrolysis effects in d. c. arc processes, Electric Furnace Conf. proc. 47(1989) 57-64.

[13] A. McLean, I.D. Sommerville, F.L. Kemeny: Enhanced slag-metal reactions, Proc. 4th Int. Conf. Molten Slags and Fluxes, Iron and Steel Institute of Japan, Sendai, 1992, pp.268-273.

[14] M. Grimble, R.G. Ward, D.J. Williams, Kinetics of silica reduction by carbon-saturated iron, J. Iron Steel Inst. 203(1965) 264-267.

[15] D. E. Woolley, U. B. Pal, Experimental evidence for electrochemical nature of the reaction between iron oxide in calcia-silica-alumina slag and carbon in liquid iron, Metall. Mater. Trans. B. 30B(1999) 877-889.

DOI: 10.1007/s11663-999-0093-7

[16] U. B. PAL, S. A. Macdonald, D. E. Woolley, A. C. Powell, Results demonstrating techniques for enhancing electrochemical reactions involving iron oxide in slags and C in liquid iron, Metall. Mater. Trans. B. 36B(2005) 209-218.

DOI: 10.1007/s11663-005-0022-3