CIRCULATING VACUUMISING DEVICE WITH SCREEN FOR SUPPRESSION OF METAL DROPS Russian patent published in 2008 - IPC C21C7/10 

FIELD: metallurgy.

SUBSTANCE: invention refers to iron and steel metallurgy, particularly to assemblies for out-of-furnace treatment of liquid steel. The circulating vacuumising device contains a vacuum chamber, wherein in its lower portion sucked in and exhaust branches are installed, a blowthrough tuyere for gas and/or reagents supply, a branch for ferroalloys supply, a branch for input of the blowthrough tuyere into the vacuum-chamber, a branch for exhaust gases, and a gas pipe; the area of the exhaust branch is lower than the area of the sucked-in branch. A screen for metal drops suppression is water-cooled and lined below with a fire resistant material; the said screen is installed in the vacuum chamber on a fire-resistant projection at a distance of 300-1500 mm from the metal surface and has two apertures: one is for input of the blowthrough tuyere located over the screen for suppression of metal drops, while the other is for gases exhaust through the gas pipe, connected via a side branch to the vacuum-chamber. The invention allows reducing the height of a metallurgical assembly, it also reduces specific consumption of refractory materials as well as the cycle of out-of-furnace steel treatment.

EFFECT: decreased height of circulating vacuumising device, reduced refractory material specific consumption as well as duration of cycle of out-of-furnace steel treatment.

2 cl, 1 tbl, 2 dwg