Experimental evidence for electrochemical nature of the reaction between iron oxide in calcia-silica-alumina slag and carbon in liquid iron

Woolley, David; Pal, Uday B.

doi:10.1007/s11663-999-0093-7

Cited by 16 publications

(3 citation statements)

References 5 publications

(3 reference statements)

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“…Some researchers have suggested that the reactions between slag and molten alloys are electrochemical in nature. [26][27][28][29][30] These findings, along with the evidence of the role of electrons in the mass transfer of oxygen through slag, [31,32] suggest that, for some reactions, the kinetics can be controlled by electronic transport in slag.…”

Section: Introductionmentioning

confidence: 99%

Electrical and electronic conductivity of CaO-SiO2-FeO x slags at various oxygen potentials: Part I. Experimental results

Barati

Coley

2006

Metall Mater Trans B

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The oxygen potential dependences of total electrical and partial electronic/ionic conductivities for 'FeO'-CaO-SiO 2 slags have been studied both experimentally and theoretically in the present work. In the first part of this two-part article, the experimental results are presented for slags with 30 wt pct 'FeO' and CaO/SiO 2 wt ratios of 0.5, 1.0, and 2.0. For each slag composition, measurements of total electrical conductivity and electronic transference were made over a range of oxygen potentials and temperatures. The results were used to calculate the partial conductivities. A maximum was achieved in total and electronic conductances as a function of equilibrium CO 2 /CO. The CO 2 /CO corresponding to the maximum was shifted to lower values with increasing slag basicity (CaO/SiO 2 ratio). The other effect of basicity was increasing total and partial conductivities, with a magnitude that depends on oxygen potential and temperature. The activation energies for ionic and electronic conductances were in similar ranges and decreased with the basicity.

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Section: Introductionmentioning

confidence: 99%

Electrical and electronic conductivity of CaO-SiO2-FeO x slags at various oxygen potentials: Part I. Experimental results

Barati

Coley

2006

Metall Mater Trans B

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“…The above observation proves that the cathodic reaction actually takes place at the wall of the iron crucible. Recently, Woolley et al 25) studied the reduction kinetics of CaO-SiO 2 -Al 2 O 3 slags containing up to 8 wt% FeO, and reported that the reduction of iron oxide from slag by carbon in iron occurs as separate anodic and cathodic reactions; the locations of these reactions may be physically separated by macroscopic distances, and hence the overall reaction is an electrochemical reaction.…”

Section: (7)mentioning

confidence: 99%

Smelting Reductron Mechanism of Fe-O-S Melts Using Solid Carbon.

et al. 2001

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“…When DC current passes through the molten slag from the molten metal and then pass to DC-arc or the top graphite electrode, electrolysis occurs at both the metal-slag interface and the slag-gas interface or top graphite. The existence and effects of the electrolysis in steel melting and refining are dependent on whether the nature of the reaction is electrochemical and whether the DC electric current pass through the slag-metal interface [8][9][10][11][12][13][14][15][16]. What will be the effect on the yield of alloy elements if the high manganese TWIP steel is melted with the DC-arc furnace?…”

Section: Introductionmentioning

confidence: 99%

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

Chen

Jiang

2013

AMR

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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 ((O2-)=[+2e and (O2-)=1/2O2+2e) at the slag-metal interface has been observed, and causes the increasing of oxygen content in the molten metal.

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Experimental evidence for electrochemical nature of the reaction between iron oxide in calcia-silica-alumina slag and carbon in liquid iron

Cited by 16 publications

References 5 publications

Electrical and electronic conductivity of CaO-SiO2-FeO x slags at various oxygen potentials: Part I. Experimental results

Electrical and electronic conductivity of CaO-SiO2-FeO x slags at various oxygen potentials: Part I. Experimental results

Smelting Reductron Mechanism of Fe-O-S Melts Using Solid Carbon.

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

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