DEVICES AND APPARATUS FOR INJECTING GAS INTO HIGH TEMPERATURE LIQUIDS, E.G. MOLTEN METALS

摘要

Apparatus for injecting gaseous substances into e.g. molten metal includes a nozzle block (310) for installing in the wall (10) of a vessel (12). The nozzle block (310) has a passage (311) closed by a plug at its gas discharge end, the plug (312) being pierced by capillary bores and having a feed pipe (316) gas tightly coupled thereto. The feed pipe (316) extends along the passage (311) from the plug (312) and terminates in an inlet member (324) by which the pipe is operatively connected to an external gas duct system (315) for receipt of gas from a supply. The pipe (316) is resilient and extensible and includes a coiled portion, and the passage is substantially completely occupied by a cartridge (340) containing a packing of refractory particulate in which the pipe (316) is embedded. In service, due to the temperature within the passage (311), the cartridge (340) may collapse allowing the refractory particulate to slump and completely block the passage as a guard against entry of melt to the passage.