Deoxidation of Liquid Steel with Molten Slag by Using Electrochemical Method

Abstract

A new unpolluted deoxidation method for liquid steel was given in this paper. Four deoxidation experiments were done, under the conditions of applied voltage U=0, 2 V, 4 V and 6 V between the liquid steel and CaO(45 wt%)-Al2O3(55 wt%) molten slag. The results showed that the deoxidation rate increased as increasing of applied voltage. In addition, based on the oxygen diffusion behavior under the gradient of electrochemical potential, the kinetics formulae for deoxidation of steel with molten slag electrochemistry method are derived. The formulae can well describe the change of dissolved oxygen content in the steel. From the formulae it can be concluded that deoxidation rate could be enhanced by strengthening the stirring of steel, increasing the applied voltage, and selecting slag system with a high basicity and a low viscosity, etc.

Desulfurization of molten steel with molten slag using the electrochemical method

“…The application of external electric field between slag and steel also could enhance the deoxidation rate of molten steel [14][15][16]. The efficiency for deoxidization and the final oxygen content of molten steel as a function of the external voltage is shown in Fig 4 . The initial total oxygen content of molten steel is about 100ppm, which includes soluble oxygen and inclusions.…”

“…The first reason is that the transfer of sulfur and oxygen in liquid phase mass transfer was enhanced, and a rapid mass transfer caused by the external voltage leads to an acceleration of the desulfurization and deoxidization rate. The second reason is that as the (FeO) concentration in the top slag is reduced [14], which can be concluded simply from the fact that the total iron content in the final slag decreased with the increase of the external voltage, the sulfur partition ratio between slag and metal increased, and the sulfur of molten steel decreased.…”

Ultra‐High Temperature Molten Oxide Electrochemistry

“…UTE can also be used in steelmaking processes. Zhang et al [121] proposed a novel method for the deoxidation of liquid steel by UTE in 45 wt % CaO-55 wt % Al 2 O 3 slag (Figure 7d). [O] in liquid steel is reduced to O 2À , which is then dissolved into molten slag.…”

A New Design of Oxygen Sensor for Electromotive Force Measurement and Electrochemical Deoxidation by Using Oxygen Pump

“…Several researchers attempted to develop this technology by using similar apparatus mentioned above, i.e., an oxygen sensor with different metallic lead wire, such as chromel (Ni-Cr alloy), Mo, Pt and so on. [10][11][12][13][14][15][16][17] Nevertheless, there is no evidence on which we can avoid the oxidation of metallic lead wire at high temperature. The result of low oxygen concentration in molten metals might be caused by both electrochemical and chemical deoxidation in the previous works.…”