Nozzles for injecting substances into liquids

An injection nozzle for installing in the wall of a liquid containment vessel, for use when injecting substances into the liquid, comprising a nozzle body formed with a plurality of passages arranged at intervals along a ring, and at its discharge end the body has an annular closing member defining discharge portions of the passages which discharge portions are each closed by a frangible web, the said member including its webs being resistant to percolation of liquid into the passages, and the webs being detachable from the annular member by forces applied thereto from inside their associated passages.

A combination of replacement components for installing in an injection nozzle, comprising a metal lance pipe, a tubular guide element for slidably receiving the said pipe, and a refractory closing element resistant to percolation of liquids therethrough, the closing element being of reduced strength adjacent a closing portion thereof to render the latter readily detachable from the remainder of said element when the closing portion is struck.

A passage closing element for use in an injection nozzle to close an injection passage therein comprising a hollow, fine-grained refractory shell which is closed at one end and is resistant to the percolation of liquids therethrough, the shell having an end closing portion and sidewall united by a shell portion of reduced strength enabling the end closing portion to be detached from the sidewall by breakage of the said shell portion.

A passage closing element for use in an injection nozzle to close injection passages therein, comprising an annular, fine-grained refractory body resistant to the percolation of liquids therethrough, the annular body having recesses in a surface thereof to define apertures for discharge of injectants, the recesses extending to and terminating in thin closing webs and the body being of weakened configuration adjacent the webs to enable them to be broken away from the remainder of the body.

An injection nozzle for the wall of a liquid containment vessel, for use when injecting substances into the liquid, comprising a nozzle body having at least one injection passage and a passage closing means initially closing said passage, said closing means comprising a fine-grained refractory shell which is resistant to percolation of liquid therethrough, said shell being a generally cylindrical hollow body having a transverse passage-closing web, said shell being of generally "H"-shaped cross-section, and said web being detachable from the shell, in use to create an opening therethrough enabling injection from said passage to commence.

A passage closing element for use in an injection nozzle to close an injection passage therein, comprising a fine-grained refractory shell which is resistant to percolation of liquid therethrough, said shell being a hollow body having a transverse web and having a generally "H"-shaped cross-section, said web being detachable from said shell by breaking away from the remainder of said shell.