BLASROR FOR BEHANDLING AV SMELT METALL I METALLURGISKA KERL

摘要

A blow lance for treating molten metal comprising a concentric metal pipe structure enclosed within a ceramic covering with a space defined between the pipe structure and the covering. A layer of heat-resistant elastic fibrous material, excluding a binder, is positioned in the space. Ducting means forming coolant ducts are located between the concentric pipes.