METHOD OF GAS-DYNAMIC CUT-OFF OF SLAG FROM METAL WHEN TAPPING MELTING FROM ARC STEEL-SMELTING FURNACE Russian patent published in 2015 - IPC F27D3/15 C21C5/46 

FIELD: metallurgy.

SUBSTANCE: slag cut-off is performed by means of two inert gas flows, first of which is supplied in the form of nitrogen or argon flows from below into the volume of liquid metal through the blowing-off device installed in a lined wall of the furnace with the porous fire-resistant unit with formation in front of the input to the outlet of breaker tap hole, and the second flow - by means of a tuyere with a multinozzle tip from above through the furnace arch to the surface of the formed breaker with providing of cleaning of its surface from slag, cut-off of slag and prime tapping of liquid metal through the outlet, the moment of finish of tapping of liquid metal and start of tapping of slag are fixed by a difference of temperatures of metal and slag monitored by means of the automatic radiation pyrometer.

EFFECT: invention allows to cut-off slag from metal practically at the outlet from the hole of the arc furnace that minimises impact of oxidised slag on metal in the furnace and improves efficiency of the melting.

5 cl, 1 dwg