Hot method of installing the converter bottom blowing tuyeres

摘要

PROBLEM TO BE SOLVED: To provide a hot installation method for improving a life time of bricks after being drilled in newly installing a new bottom blowing tuyere in a converter bottom.SOLUTION: A magnesia carbon brick is previously arranged, as a brick 6a for drilling, at a part other than an installation part of a bottom blowing tuyere in a converter bottom refractory layer, the magnesia carbon brick containing metallic aluminum of 0.5 to 3 mass%, metallic silicon of 0.1 to 1 mass%, and carbon of 15 to 25 mass%. In installing a new bottom blowing tuyere 1a after an operation period of the converter, a hole 8 is formed in the brick 6a for drilling so as to penetrate the refractory layer, by drilling the brick 6a for drilling from outside of the bottom part with a core bit 15 provided with segments formed by bonding diamond abrasive grains with a binder. Thereafter, a new bottom blowing tuyere 1a in converter is inserted and installed in the through hole 8.