Lance for desulphurizing cast iron or steel

摘要

A refractory sleeve terminating in a refractory head surrounds an injection pipe for injection of a desulphurizing agent under gas pressure into cast iron or steel and forms with the injection pipe a cooling chamber closed at its lower and lateral parts. A plurality of cooling air inflow pipes extend from a distributor case overlying the refractory sleeve through the cooling chamber in a circumferential array parallel to the injection pipe with the ends of the pipe facing the closed bottom of the chamber open to effect discharge of very cool air in the vicinity of the refractory head with the cooling air escaping upwardly within the chamber about the inflow pipes to cool the injection pipe and the refractory sleeve prior to escaping from the sleeve at the top.