Device for introducing gas into molten metal in a wide annular stream

Abstract From the Canadian patent

A device for introducing gas into a mass of molten metal comprises a refractory plug and a jacket positioned thereabout in spaced relation thereto, said device having an upper end and a lower end with said upper end being substantially larger than said lower end so as to fit into a pocket block having a passageway extending vertically therethrough. The pocket block forms a portion of a refractory lining in a container for the molten metal and an opening in said container and refractory lining defines a passageway for gas introduced thereinto whereby said gas will flow upwardly between said plug and said jacket into said molten metal in said container.