A stirring device includes a stirring unit, a gas supplying unit, and a feeding unit. The stirring unit includes a drive mechanism and a shaft member. The shaft member includes a hollow rotary shaft coupled to be driven by the drive mechanism to rotate, and a stirring head coupled to rotate with the hollow rotary shaft. The gas supplying unit includes a gas supply, and a piping member fluidly communicating with the (gas supply and the shaft member. The feeding unit includes a storage tank and a feeding tube fluidly communicating with the storage tank and the shaft member.

Gas purging system comprising a gas purging plug (10) and gas purging plug (10) for metallurgic applications and a gas supply pipe (30) connected to the gas purging plug (10), the gas purging plug (10) with a ceramic refractory body (10k) with a first end (10u) and a second end (100); the second end (100) is in the mounted position of the gas purging plug (10) in contact with a metal melt (41); the first end (10u) is at least partially covered with a metal cover (12.1), the metal cover (12.1) comprises an opening (16) to which optionally a gas supply adapter (20) is connected; the gas purging plug (10) is designed in such a way, that a purging gas which is supplied via the gas supply pipe (30) to the opening (16) flows through the body (10k) and exits the body (10k) at the second end (100); and wherein at least one electronic sensor (70, 70.1, 70.2, 70.3, 70.4) is in contact with the gas purging plug (10), to detect an oscillation waveform of a mechanical vibration (81). The gas purging system further comprises a data processing unit (80) for acquiring the oscillation waveform of a mechanical vibration (81) detected by the electronic sensor (70, 70.1, 70.2, 70.3, 70.4) of the gas purging plug (10) and for calculating a bubble index-signal (83) from the oscillation waveform of a mechanical vibration (81) detected; a control unit (100); wherein the control unit (100) is configured to: displaying the bubble index-signal (83) and/or varying the volume flow (102) through the gas supply pipe (30) depending on the bubble index signal (83) and/or -generating a warning signal (101) when the bubble index signal (83) lies outside a defined range.

The invention relates to a refractory ceramic gas purging element featuring an insert which was cast into a blind hole within a refractory gas permeable body, which insert is made of a refractory ceramic material and has a density different to that of the body.

A diffusion component for impregnating molten steel with a gas includes a barrier having a first side and a second side, a through-hole formed within the barrier, the through-hole connecting the first side to the second side, and a porous element arranged within the through-hole such that the flow of molten steel passes over the porous element. At least one flow disrupter is arranged relative to the porous element and configured to promote non-laminar flow of molten steel passing through the through-hole.

A system and method for installing and removing a porous plug relative to a port of metallurgic ladle includes an extendable boom rotatable about vertical axis and pivotable up and down at a first end of the boom. A mast is coupled to a second end of the boom and rotatable about multiple axes relative to the boom to position or maintain the mast in a given orientation, such as in alignment with the port of the ladle in response to rotatable or pivotable movement of the boom. The mast includes a slider mast that is translatable along the length of the mast to insert the plug or retract the plug. The mast may also include jaw grippers to secure the plug and may be configured to rotate the plug relative to the mast. The system may automatically control the position and orientation of the boom, mast, and slider mast.

A tuyere comprising an inner tube including a lower section having a first diameter, an upper section having a second diameter smaller than the first diameter, and a converging transition section having a converging angle from 15 to 35 connecting the lower section to the upper section, the inner tube terminating in an inner nozzle at a downstream end of the upper section; and an outer tube surrounding the inner tube so as to create an annulus there between, the outer tube including a lower section having a third diameter larger than the first diameter, an upper section having a fourth diameter smaller than the third diameter but larger than the second diameter, and a converging transition section having connecting the lower section to the upper section, the outer tube terminating in an outer nozzle at a downstream end of the upper section.

Provided is a sealing block installation structure capable of preventing the occurrence of a gap between a nozzle or plug installed in a bottom portion of a molten metal vessel and a plate or the like located on the lower side of the nozzle or plug, and a gap between the nozzle or plug and a sealing block located on the upper side of or on the outer peripheral side of the nozzle or plug. In the seating block installation structure, a seating block 2 disposed to surround a nozzle for discharging therethrough molten metal downwardly from the bottom portion of the molten metal vessel or a plug is fixed to a shell of the bottom portion of the molten metal vessel by a connecting member 3.

A molten metal processing apparatus selected from a pump, a degasser, a flux injector, and a scrap submergence device constructed to include at least one element comprised of C/C composite.

The invention relates to a gas purging device for installation in a metallurgical vessel, said device having the following features in a position installed in the bottom of the metallurgical vessel: a lower, largely gas-tight base part, a gas line runs in the base part from a first end in the region of a first outer face of the base part to a second end in the region of a second outer face of the base part, the second end of the gas line is formed as a first portion of a coupling, a second portion of a coupling is located in the region of an outer connection face of a functional part, by means of which the functional part rests against the base part, a gas distribution device runs in the functional part from the second portion of the coupling, through the functional part, to at least one free surface of the functional part formed as a gas outlet face, the base part and functional part are each made of a refractory ceramic material.

A method of operating a BOF bottom stir tuyere having an inner nozzle surrounded by an annular nozzle, including during a hot metal pour phase and a blow phase, flowing an inert gas through both nozzles; during a tap phase, initiating a flow of a first reactant through the inner nozzle and a flow of a second reactant through the annular nozzle, and ceasing the flow of inert gas through the nozzles, wherein the first and second reactants includes fuel and oxidant, respectively, or vice-versa, such that a flame forms as the fuel and oxidant exit the tuyere; during a slag splash phase, continuing the flows of fuel and oxidant to maintain the flame; and after ending the slag splash phase and commencement of another hot metal pour phase, initiating a flow of inert gas through both nozzles and ceasing the flows of the first and second reactants.