METHOD AND APPARATUS FOR TREATING LIQUID METAL IN A VESSEL

摘要

ABSTRACTA method and apparatus for treating molten metal in a bottompour vessel through a pouring opening controlled by a slidable gateclosure member. A dual concentric tuyere having a central conduitand an outer annular conduit is positioned in the pouring openingof the vessel. Treating material is injected into the moltenmetal through the central conduit of the tuyere and a coolant ispassed through the outer annular conduit of the tuyere. Aftercompletion of the treatment, oxygen is blown through both thecentral conduit and the annular conduit to burn back the tuyere,opening the nozzle well for pouring.:.