Development stage of new technology of refractories industry

In the past 10 years, there has been no special new technology in the Japanese refractory industry. At present, it is still mainly used existing technologies to develop new products, especially to improve and perfect existing products. In fact, it is still a continuation of the development phase of new technologies and new products. At present, people still use the total oxygen content to measure the amount of inclusion in steel. The exclusion of inclusions in molten steel has a great influence on its deoxidation.

Inclusions floating up to the surface of the slag are absorbed by the slag. It can also be suggested by the refractory material that most of the inclusions in the steel are absorbed by the wall of the ladle. In this study, since the surface of the molten steel is free from slag, only the absorption of inclusions by the refractory material is considered. In this case, we believe that the liquid phase in the refractory material plays a role similar to slag. The principle of slag absorption inclusions can be applied to the liquid phase of refractory materials. The inclusion of inclusions in the steel by the refractory material can be divided into two stages: inclusions near the refractory material are transferred from the molten steel to the refractory material. Since the interface energy of most oxides with molten steel is much larger than the interfacial energy with the liquid phase of the slag or refractories, inclusions entering the refractory liquid phase from the molten steel are spontaneous processes.

Because of the concentration difference between inclusions in the molten steel and the inclusions near the refractory material, the inclusion particles undergo macroscopically oriented migration, ie, diffusion, due to thermal motion. This diffusion is caused by the disordered thermal motion of the inclusions. The diffusion rate can be measured by the diffusion coefficient D. In general, the larger the particles, the smaller the diffusion coefficient.

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