Abstract
The wetting and spreading phenomena of molten slag were observed in situ on dense MgO and MgO-C refractory substrates. Parameters associated with wetting and spreading of molten slag, such as the contact angle, droplet height, diameter, and volume, were measured and calculated. The microstructure and chemical composition of the corroded dense MgO and MgO-C refractory were studied using SEM and EDS analysis. The droplet volume of molten slag on dense MgO declined faster than that on MgO-C refractory during the first 90 s of the testing period, whereas the droplet volume exhibited little difference across the two cases after 150 s. Molten slag penetrated the dense MgO and MgO-C refractory through grain boundaries and the channels which were formed by the dissolution of MgO. Besides, the slag also penetrated into the MgO-C refractory through the pores and channels formed by the redox reaction between slag and carbon, and a reaction product (Fe) was found at the interface. The dissolution of MgO and redox reactions changed the wetting process and increased corrosion of the MgO-C refractory.
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