COAXIAL MATERIAL-STIRRING LANCE AND METHOD OF USE

摘要

A coaxial material-stirring lance (40) and method used to treat molten metal in a ladle, the lance having a stirring gas chamber (48), and a plurality of gas permeable ports (50 52) arranged as upper and lower port arrays along a length of the gas chamber, and at least one material chamber (43) positioned inside and coaxial with the gas chamber and terminating in at least one material ports (60). In another embodiment, a second material chamber is included inside the gas chamber, parallel to and immediately adjacent the material chamber. In use, the coaxial material-stirring lance is lowered into the ladle of molten metal, and gas and material are both introduced into a respective chamber. Gas mixes material through the molten metal, causing impurities to be removed from the metal.

主权项

1. A coaxial material-stirring lance (40) comprising:
a gas chamber (48) having a first end and a terminal end, and a length between the first end and the terminal end; a gas connection pipe (44) at the first end; at least one of an upper port (50), a lower port (52), and a bottom port (51) leading out of the gas chamber (48) to an exterior of the coaxial material-stirring lance (40) formed into the length; and a material chamber (43) having at a first end a material connection pipe (42) and at a second end terminating in at least one material discharge port (60); wherein at least one of the upper port (50), the lower port (52), and the bottom port (51) is a gas permeable structure; wherein the material chamber (43) is positioned inside the gas chamber (48) so as to create a pair of coaxial chambers; and wherein the exterior of the coaxial material-stirring lance (40) is encased in a refractory coating (46).