METHOD OF BLOWING-IN BLAST FURNACE Russian patent published in 2001 - IPC

FIELD: ferrous metallurgy, particularly, blast-furnace production. SUBSTANCE: method includes installation of metal pipe into channel of iron tap-hole, coating of blast-furnace bottom with a layer of protective material, supply through tuyeres of hot blast with periodically increasing flow rate by value excluding burden suspension, and changing into working space of coke, coke with limestone and coke with ore. Amount of the latter is increased gradually to coke-ore ratio equal to nominal value at the end of blowing-in. Heat products are periodically tapped. Metal pipe installed in channel of iron tap-hole is connected with pipeline of hot blast and supplied through it, prior to blast supply to tuyeres, is blast with temperature of 500-600 C for 10-12 h. Pipe in channel of iron tap-hole is installed at an angle of 3-10 deg upward with its bringing to working space at a distance of 1 m. During supply of blast through said pipe, tuyeres are closed with refractory material. Flow rate of hot blast through tuyeres is periodically increased by successive addition of group from 3-5 tuyeres after successive tapping of heat products. EFFECT: reduced terms of blast-furnace blowing in, obtaining during the first tappings of standard iron and excluded emergency situations. 7 cl, 2 dwg, 1 tbl, 1 ex