Penetration Behavior of CaO-SiO2-FeOx-MgO-(CaCl2) Slags in MgO Refractory

Laboratory experiments were carried out to investigate the effect of CaCl2 addition on the penetration behavior of BOF slags in MgO refractory. Slag viscosity and surface tension as well as the contact angle between the slags and MgO refractory were measured. It is found that the penetration depth increases with experimental time. Adding CaCl2 to BOF slag will enhance the penetration depth of the slags in MgO refractory. The viscosity and surface tension as well as contact angle are reduced by the addition of CaCl2 into the slags. The improved fluidity and wettability are the main reasons for the increase in penetration depth. The degradation mechanism of MgO refractory by CaCl2-added BOF slag was discussed, and both chemical reactions and slag penetration take place during the degradation. The structure of the MgO refractory influences the degradation evidently. For dense refractory, adding CaCl2 may be beneficial to lower the degradation; while it accelerates the degradation of porous refractory.

Automated summary

Laboratory experiments were conducted to investigate the effect of adding CaCl2 on the penetration behavior of BOF slags in MgO refractory. The results showed that the penetration depth increased with experimental time. The addition of CaCl2 enhanced the penetration depth by reducing the viscosity, surface tension, and contact angle of the slag. Improved fluidity and wettability were identified as the main reasons for the increased penetration depth. The degradation of MgO refractory by CaCl2-added BOF slag was discussed, with both chemical reactions and slag penetration playing a role. The structure of the MgO refractory significantly influenced the degradation, as the addition of CaCl2 had differing effects on dense and porous refractory.