| 摘要 |
PURPOSE:To prevent the penetration of molten steel into a closed tuyere and to prevent the falling-off and the floating of a closing refractory material, in closing the tuyere of the damaged furnace bottom of a bottom blowing converter, the inside of the tuyere is filled with plural peaces of figurate refractory materials by using a small amount of an amorphous refractory material. CONSTITUTION:When a part of the furnace bottom tuyere of a bottom blowing converter is damaged, said tuyere is closed and the remaining tuyer is used to carry out refining. In closing the damaged tuyere, into the outer pipe 4 of the tuyere, plural pieces of figurate refractory materials 5a-5e having an outer diameter slightly smaller than the inner diameter of the tuyere outer pipe 4 are successively put as well as the peripheries of plural pieces of the figurate refractory materials are coated with an amorphous refractory material 6 such as magnesia mortar having a thermosetting resin as a binder compounded therein to close the inside of the tuyere outer pipe 4. Because the closing material is free from voids, the penetration of molten metal during refining or the falling-off and the floating of the closing refractory material are not generated and, therefore, molten metal is not leaked from this closed part. |
