APPARENT SOFTENING VISCOSITY MEASUREMENT OF GRANULATED SLAG PACKED BED WITH SOFTENING AND MELTING SIMULATOR

摘要

In this study, slag behavior is focused as the most important melt in cohesive zone because they have higher viscosity and possibility to clogging than molten iron. Using the newly developed softening and melting simulator, effect of the slag behavior in softening and melting process on gas permeability through granulated slag packed sample layer was investigated. Apparent softening viscosities were estimated from shrinkage resistance of the sample packed bed. The slags were crushed and sieved in 4-5mm and then charged into graphite crucible, inner diameter 35 mm, which has holes in bottom. The sample was heated up to 1200-degree C with 1000-degree C/min. After reaching 1200 degree-C, heating rate was changed to 10-degree C/min. During heating experiment, 0.1 MPa load was added to the sample layer from top part through lid and N2 gas was flowed from bottom side with INL/min. Displacement amount of the sample layer thickness and gas pressure drop were measured for evaluation of softening and melting behavior. From this evaluation, it was found that the apparent softening viscosity at higher shrinkage degree is strongly related with pressure drop in the sample packed bed and surface tension of molten slag has dominant effect on the apparent softening viscosity.