Patent ID: 8003044

Claim:
A metallurgical lance to extend into a vessel for injecting solid particulate material into a molten material held within the vessel, the lance comprising: a central core tube configured to pass the solid particulate material therethrough; an annular cooling jacket surrounding the central core tube throughout a substantial part of its length and provided with internal water flow passages for forward and return flow of cooling water therethrough, the annular cooling jacket having an outer surface; and an outer annular part that is double walled with internal water flow passages formed between the double walls for flow of cooling water therethrough, the outer annular part being disposed about the annular cooling jacket such that a substantial portion of the annular cooling jacket extends forwardly of the outer annular part, and wherein the outer annular part is spaced from the outer surface of the annular cooling jacket by an annular region and is fixed to the annular cooling jacket by a solid connection.