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Sintering plant. Complex of equipment on aspiration of air.
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In the sintering plant works have been accomplished and equipment on air aspiration from the tail parts of the sintering machine has been put into operation. The turbo air blower with low blast parameters (G=2600 nm3/hour, P=1,8 atm) has been replaced by a high efficiency turbo air blower with high blast parameters (G=3250 nm3/hour, P=3,2 atm), which allows to save heat power at the amount of 6900 tons of equivalent fuel per year. The new environmentally-friendly equipment installed in the sintering plant is able to clean up to 1,6 mln m3 of polluted air per hour, which allows to reduce atmospheric emissions by approximately 2,5 thousand tons of dust per year. The iron containing dust caught in the electric precipitators is returned to production. An ore grab-bucket crane has been purchased and installed.  |
Blast furnace shop
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Blast furnaces No.2 and No.3 have been reconstructed.
Both the blast furnaces in terms of their technical capabilities are one of the best on the post-Soviet territory. The furnaces are equipped with automated control systems, modern casting yards with covered runners and an aspiration system. For the first time on blast furnace No.2 shaft free apparatus with cupola burners have been used, which allow to increase the temperature of hot blast up to 1200°Ń, reduce the consumption of coke by 7 kg/t of hot metal. A station has been built for heating fuel gas and combustion air, which is supplied to the air heater, using the heat of the smokestack exhaust gases. This allows to save 10 mln m3 of natural gas per year.  |
Air separation unit, VRU-60
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The new air separation unit with capacity 60 000 m3/hour has been put into operation. It supplies production shops with oxygen with purity 99,5% (against 95-96%) and allows to increase, in comparison with the present situation, the production of oxygen - by 107,8 mln m3/year; nitrogen – by 108,6 m3/year; argon – by 10,0 m3/year; crypton and xenon mixture — by 0,90 mln m3/year. It completely excludes controlled atmospheric emissions of oxygen, which amounted to 14%, provides economy of electric energy and heat.  |
Intermediate coiling device “coil-box”.
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Active work is going on in the hot strip mill shop. The roughing group of continuous hot strip mill “1680” has been completely reconstructed with replacement of the electric drive and reinforcement of the mechanical part to provide industrial technology of transfer rolling as per diagram “ingot-slab-coil” with weight up to 16 tons in continuous subgroups of stands “DUO-No.1, No.2-No.3 and No.3-No.4”. Shears for cutting front and rear ends of transfer bars before the finishing group of continuous hot strip mill “1680” were put into operation. New electric motors of the finishing group stands of the mill of capacity 7000 kW AC with regulation of speed instead of the morally worn out DC electric motors of capacity 5000 kW, which allowed to provide effective work of the hot strip mill, exclude overload during rolling of small thicknesses, provide stable rolling of 16 ton slabs, widen the assortment of rolled strips and save electric energy. The intermediate coiling device “coil-box” has been put into operation to coil transfer bars before the finishing group, providing uniform distribution of temperature along the whole length of the strip and the set requirements for the mechanical characteristics of rolled metal. It also allows to widen the range of products rolled on the mill. Binding machines of hot rolled coils have been installed at coilers 1-3, allowing to exclude loosening of the coils and their damaging in the process of their transportation along conveyors, providing stable rolling on cold rolling mills and reduction of metal consumption. During capital repair shearing line No.2 for cutting 16 ton coils was reconstructed. The roll-grinding machine of firm “Hercules” for profiling the working and back-up rolls of the mill was put into operation and several other measures were taken.  |
Heat treatment department. Bell-type furnaces of “Ebner” firm.
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At present further reconstruction of mill “1680” is being carried out to be able to roll hot rolled strips of a minimum thickness 2,0 mm, which correspond to the present day level of quality factors in respect of geometrical sizes , surface quality, flatness and mechanical properties. In the cold-rolling shop reconstruction of the heat treatment department has been accomplished. 18 stands of bell-type furnaces and stations for the production of hydrogen of firm “Ebner” were constructed, providing production of high quality cold rolled metal in the amount of 276 000 tons per year and economy of 2,5 mln m3/year of natural gas. Constructive and technological peculiarities of high convective hydrogen furnaces allowed to provide stable production of cold rolled steel grade 08Yu in correspondence with the requirements of GOST standard 9045-93. Slitting line of firm “Danielli” was put into operation, providing production of competitive products, such as cold rolled strips with tight uniform winding, qualitative oiling and weight of coil according to the consumers’ requirements. | 
