Abstract

In general, the used refractories in a steelmaking works are disposed as the waste materials. We have worked on the recycle use of these used refractory materials to reduce the amount of the waste materials.

It was well known that the used refractory materials were used again as the castable or gunning refractory materials but we tried to use them as the hearth bottom lining material of a heating furnace in a hot rolling mill as a new application of the recycled refractories. We thought that it would be good to make the scale removal work on the surface of the hearth bottom easier by using the recycled materials there and, in addition, we expected to cut down the repair bricks cost.

After several trials, we established a new application technology of the recycled refarctories, and the cost of the hearth refractories was reduced and the scale removal work became easier.