Abstract
Abstract MgO–C refractory was polarized across the slag-refractory interface at a voltage of 8 V in a synthetic CaO–Al2O3–SiO2 – (MgO) Slag at 1773 K. A deposition layer mainly composed of dicalciumsilicate (2CaO.SiO2) or spinel (MgO.Al2O3) with several hundred microns thick was achieved by cathodic polarization. However, the anodic decay was accelerated in comparison to the cathodic refractories and nonpolarized reference MgO–C refractories. The electrodeposition layer was mainly caused by the reduction of silicate anions, in which a shift of slag composition to the dicalciumsilicate (C2S) or spinel (MA) primary phase field was induced. Furthermore, the rapid migration of mobile Ca2+ and Mg2+ ions can also lead to the enrichment of CaO and MgO at the slag/refractory interface. The present voltage level (8 V) is acceptable for the economic considerations and the slag component also need a careful section for the corrosion protection of MgO–C refractories.
Highlights
MgO–C refractories are widely used as furnace and ladle lining due to their high melting point, corrosion resistance and shock resistance [1, 12, 3]
Reduction potential of silicate and physical properties of synthetic slag As mentioned above, the reduction of silicate anions can be the drive force for the formation of desired primary phase, explained as the known back rule in the ternary diagram
All the experiments were conducted at voltages of 8 V across the anode and cathode interface, which could ensure the reduction of silicate anions
Summary
MgO–C refractories are widely used as furnace and ladle lining due to their high melting point, corrosion resistance and shock resistance [1, 12, 3]. A deposition layer mainly composed of dicalciumsilicate (2CaO.SiO2) or spinel (MgO.Al2O3) with several hundred microns thick was achieved by cathodic polarization. The electrodeposition layer was mainly caused by the reduction of silicate anions, in which a shift of slag composition to the dicalciumsilicate (C2S) or spinel (MA) primary phase field was induced.
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