Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia

A. S. Kharchenko, Dr. Eng., Associate Prof., Head of the Dept. of Metallurgy and Chemical Technologies, e-mail: as.mgtu@mail.ru
S. K. Sibagatullin, Dr. Eng., Prof., Dept. of Metallurgy and Chemical Technologies, e-mail: 10tks@mail.ru
E. O. Kharchenko, Cand. Eng., Assistant, Dept. of Metallurgy and Chemical Technologies, e-mail: eo.mgtu@mail.ru

Magnitogorsk Iron and Steel Works, Magnitogorsk, Russia
V. A. Beginyuk, Leading Specialist of the Technology Group

In the laboratory of the Nosov Magnitogorsk State Technical University, the change in the internal and external angles of the agglomerate slope containing 6.6 and 6.3 % of the 0–5 mm fraction when feeding along an inclined steel sheet located at the angle of 500 to the vertical, which simulated the movement of materials from the chute to the peripheral zone of the BF top, have been determined. The surface equivalent size of the agglomerate was 11.4 and 11.7 mm, which corresponded to the baseline and experimental periods when conducting research at the blast furnace of Magnitogorsk Iron and Steel Works (MMK). An increase in particle size by 0.3 mm was accompanied by an increase in the internal and external angles of slope by 0.15 and 0.33 %, respectively. During research on a MMK`s blast furnace, equipped with a chute loading device, the advantage of iron ore raw materials with an equivalent particle size of 11.7 mm compared to11.4 mm was realized. To do this, by adjusting the loading mode of raw materials, its content in the charge coming from the stations of the chute angular positions Nos. 9–11 was reduced on average from 100 to 96.4 % with an increase in its share at stations Nos. 6–8 from 43.7 to 45.4 % . The fill level was set to 1.4 m instead of 1.53 m. Were achieved a reduction in the coefficient of resistance of the charge to the gas flow movement in the furnace`s upper part by 3.0 %, an increase in the blast intensity by 1.26 %, an increase in the productivity of cast iron by 54 tons/day and a decrease in the specific coke consumption by 2.4 kg/t of cast iron.

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