Abstract
Deoxidation of steel melts by short‐circuiting an electrochemical cell has been demonstrated. A one‐end closed yttria‐stabilized zirconia (YSZ) tube, whose inner wall is coated with a porous molybdenum‐YSZ cermet, is inserted into the steel melt. A reducing gas is passed through the tube, and a short circuit is established between the cermet and the melt. The deoxidation process has been analyzed and mathematically modeled by dividing the external short‐circuit current into regions characterized by total resistance control and mass transport control. The kinetics are enhanced by increasing the oxygen mass‐transfer coefficient in the melt (increasing melt stirring) and decreasing the total short‐circuited cell resistance.
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