Operation of a top-and-bottom blown converter and a lance used therefor.

摘要

In the operation of a top-and-bottom blown converter top-blowing oxygen gas is blown such that the center of a hot spot created by the oxygen gas jet from each of the nozzles of a top-blowing multi-nozzle lance is positioned outside a bubbling region of the molten metal surface which rising bubbles of gas from bottom-blowing tuyeres reach.